feat(ipuaro): add session management (v0.10.0)

- Add ISessionStorage interface and RedisSessionStorage implementation
- Add ContextManager for token budget and compression
- Add StartSession, HandleMessage, UndoChange use cases
- Update CHANGELOG and TODO documentation
- 88 new tests (1174 total), 97.73% coverage

packages/ipuaro/CHANGELOG.md

@@ -5,6 +5,63 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.10.0] - 2025-12-01 - Session Management
+
+### Added
+
+- **ISessionStorage (0.10.1)**
+  - Session storage service interface
+  - Methods: saveSession, loadSession, deleteSession, listSessions
+  - Undo stack management: pushUndoEntry, popUndoEntry, getUndoStack
+  - Session lifecycle: getLatestSession, sessionExists, touchSession
+
+- **RedisSessionStorage (0.10.2)**
+  - Redis implementation of ISessionStorage
+  - Session data in Redis hashes (project, history, context, stats)
+  - Undo stack in Redis lists (max 10 entries)
+  - Sessions list for project-wide queries
+  - 22 unit tests
+
+- **ContextManager (0.10.3)**
+  - Manages context window token budget
+  - File context tracking with addToContext/removeFromContext
+  - Usage monitoring: getUsage, getAvailableTokens, getRemainingTokens
+  - Auto-compression at 80% threshold via LLM summarization
+  - Context state export for session persistence
+  - 23 unit tests
+
+- **StartSession (0.10.4)**
+  - Use case for session initialization
+  - Creates new session or loads latest for project
+  - Optional sessionId for specific session loading
+  - forceNew option to always create fresh session
+  - 10 unit tests
+
+- **HandleMessage (0.10.5)**
+  - Main orchestrator use case for message handling
+  - LLM interaction with tool calling support
+  - Edit confirmation flow with diff preview
+  - Error handling with retry/skip/abort choices
+  - Status tracking: ready, thinking, tool_call, awaiting_confirmation, error
+  - Event callbacks: onMessage, onToolCall, onToolResult, onConfirmation, onError
+  - 21 unit tests
+
+- **UndoChange (0.10.6)**
+  - Use case for reverting file changes
+  - Validates file hasn't changed since edit
+  - Restores original content from undo entry
+  - Updates storage after successful undo
+  - 12 unit tests
+
+### Changed
+
+- Total tests: 1174 (was 1086)
+- Coverage: 97.73% lines, 92.21% branches
+- Application layer now has 4 use cases implemented
+- All planned session management features complete
+
+---
+
 ## [0.9.0] - 2025-12-01 - Git & Run Tools
 
 ### Added

packages/ipuaro/TODO.md

@@ -1,40 +1,95 @@
 # ipuaro TODO
 
+## Completed
+
+### Version 0.1.0 - Foundation
+- [x] Project setup (package.json, tsconfig, vitest)
+- [x] Domain entities (Session, Project)
+- [x] Domain value objects (FileData, FileAST, FileMeta, ChatMessage, etc.)
+- [x] Domain service interfaces (IStorage, ILLMClient, ITool, IIndexer)
+- [x] Shared config loader with Zod validation
+- [x] IpuaroError class
+
+### Version 0.2.0 - Redis Storage
+- [x] RedisClient with AOF config
+- [x] Redis schema implementation
+- [x] RedisStorage class
+
+### Version 0.3.0 - Indexer
+- [x] FileScanner with gitignore support
+- [x] ASTParser with tree-sitter
+- [x] MetaAnalyzer for complexity
+- [x] IndexBuilder for symbols
+- [x] Watchdog for file changes
+
+### Version 0.4.0 - LLM Integration
+- [x] OllamaClient implementation
+- [x] System prompt design
+- [x] Tool definitions (18 tools)
+- [x] Response parser (XML format)
+
+### Version 0.5.0 - Read Tools
+- [x] ToolRegistry implementation
+- [x] get_lines tool
+- [x] get_function tool
+- [x] get_class tool
+- [x] get_structure tool
+
+### Version 0.6.0 - Edit Tools
+- [x] edit_lines tool
+- [x] create_file tool
+- [x] delete_file tool
+
+### Version 0.7.0 - Search Tools
+- [x] find_references tool
+- [x] find_definition tool
+
+### Version 0.8.0 - Analysis Tools
+- [x] get_dependencies tool
+- [x] get_dependents tool
+- [x] get_complexity tool
+- [x] get_todos tool
+
+### Version 0.9.0 - Git & Run Tools
+- [x] git_status tool
+- [x] git_diff tool
+- [x] git_commit tool
+- [x] CommandSecurity (blacklist/whitelist)
+- [x] run_command tool
+- [x] run_tests tool
+
+### Version 0.10.0 - Session Management
+- [x] ISessionStorage interface
+- [x] RedisSessionStorage implementation
+- [x] ContextManager use case
+- [x] StartSession use case
+- [x] HandleMessage use case
+- [x] UndoChange use case
+
 ## In Progress
 
-### Version 0.2.0 - Redis Storage
-- [ ] RedisClient with AOF config
-- [ ] Redis schema implementation
-- [ ] RedisStorage class
+### Version 0.11.0 - TUI Basic
+- [ ] App shell (Ink/React)
+- [ ] StatusBar component
+- [ ] Chat component
+- [ ] Input component
 
 ## Planned
 
-### Version 0.3.0 - Indexer
-- [ ] FileScanner with gitignore support
-- [ ] ASTParser with tree-sitter
-- [ ] MetaAnalyzer for complexity
-- [ ] IndexBuilder for symbols
-- [ ] Watchdog for file changes
+### Version 0.12.0 - TUI Advanced
+- [ ] DiffView component
+- [ ] ConfirmDialog component
+- [ ] ErrorDialog component
+- [ ] Progress component
 
-### Version 0.4.0 - LLM Integration
-- [ ] OllamaClient implementation
-- [ ] System prompt design
-- [ ] Tool definitions (XML format)
-- [ ] Response parser
+### Version 0.13.0+ - Commands & Polish
+- [ ] Slash commands (/help, /clear, /undo, /sessions, /status)
+- [ ] Hotkeys (Ctrl+C, Ctrl+D, Ctrl+Z)
+- [ ] Auto-compression at 80% context
 
-### Version 0.5.0+ - Tools
-- [ ] Read tools (get_lines, get_function, get_class, get_structure)
-- [ ] Edit tools (edit_lines, create_file, delete_file)
-- [ ] Search tools (find_references, find_definition)
-- [ ] Analysis tools (get_dependencies, get_dependents, get_complexity, get_todos)
-- [ ] Git tools (git_status, git_diff, git_commit)
-- [ ] Run tools (run_command, run_tests)
-
-### Version 0.10.0+ - Session & TUI
-- [ ] Session management
-- [ ] Context compression
-- [ ] TUI components (StatusBar, Chat, Input, DiffView)
-- [ ] Slash commands (/help, /clear, /undo, etc.)
+### Version 0.14.0 - CLI Entry Point
+- [ ] Full CLI commands (start, init, index)
+- [ ] Onboarding flow (Redis check, Ollama check, model pull)
 
 ## Technical Debt
 
@@ -51,4 +106,4 @@ _None at this time._
 
 ---
 
-**Last Updated:** 2025-01-29
+**Last Updated:** 2025-12-01

packages/ipuaro/src/application/use-cases/ContextManager.ts

@@ -0,0 +1,229 @@
+import type { ContextState, Session } from "../../domain/entities/Session.js"
+import type { ILLMClient } from "../../domain/services/ILLMClient.js"
+import { type ChatMessage, createSystemMessage } from "../../domain/value-objects/ChatMessage.js"
+import { CONTEXT_COMPRESSION_THRESHOLD, CONTEXT_WINDOW_SIZE } from "../../domain/constants/index.js"
+
+/**
+ * File in context with token count.
+ */
+export interface FileContext {
+    path: string
+    tokens: number
+    addedAt: number
+}
+
+/**
+ * Compression result.
+ */
+export interface CompressionResult {
+    compressed: boolean
+    removedMessages: number
+    tokensSaved: number
+    summary?: string
+}
+
+const COMPRESSION_PROMPT = `Summarize the following conversation history in a concise way,
+preserving key information about:
+- What files were discussed or modified
+- What changes were made
+- Important decisions or context
+Keep the summary under 500 tokens.`
+
+const MESSAGES_TO_KEEP = 5
+const MIN_MESSAGES_FOR_COMPRESSION = 10
+
+/**
+ * Manages context window token budget and compression.
+ */
+export class ContextManager {
+    private readonly filesInContext = new Map<string, FileContext>()
+    private currentTokens = 0
+    private readonly contextWindowSize: number
+
+    constructor(contextWindowSize: number = CONTEXT_WINDOW_SIZE) {
+        this.contextWindowSize = contextWindowSize
+    }
+
+    /**
+     * Add a file to the context.
+     */
+    addToContext(file: string, tokens: number): void {
+        const existing = this.filesInContext.get(file)
+        if (existing) {
+            this.currentTokens -= existing.tokens
+        }
+
+        this.filesInContext.set(file, {
+            path: file,
+            tokens,
+            addedAt: Date.now(),
+        })
+        this.currentTokens += tokens
+    }
+
+    /**
+     * Remove a file from the context.
+     */
+    removeFromContext(file: string): void {
+        const existing = this.filesInContext.get(file)
+        if (existing) {
+            this.currentTokens -= existing.tokens
+            this.filesInContext.delete(file)
+        }
+    }
+
+    /**
+     * Get current token usage ratio (0-1).
+     */
+    getUsage(): number {
+        return this.currentTokens / this.contextWindowSize
+    }
+
+    /**
+     * Get current token count.
+     */
+    getTokenCount(): number {
+        return this.currentTokens
+    }
+
+    /**
+     * Get available tokens.
+     */
+    getAvailableTokens(): number {
+        return this.contextWindowSize - this.currentTokens
+    }
+
+    /**
+     * Check if compression is needed.
+     */
+    needsCompression(): boolean {
+        return this.getUsage() > CONTEXT_COMPRESSION_THRESHOLD
+    }
+
+    /**
+     * Update token count (e.g., after receiving a message).
+     */
+    addTokens(tokens: number): void {
+        this.currentTokens += tokens
+    }
+
+    /**
+     * Get files in context.
+     */
+    getFilesInContext(): string[] {
+        return Array.from(this.filesInContext.keys())
+    }
+
+    /**
+     * Sync context state from session.
+     */
+    syncFromSession(session: Session): void {
+        this.filesInContext.clear()
+        this.currentTokens = 0
+
+        for (const file of session.context.filesInContext) {
+            this.filesInContext.set(file, {
+                path: file,
+                tokens: 0,
+                addedAt: Date.now(),
+            })
+        }
+
+        this.currentTokens = Math.floor(session.context.tokenUsage * this.contextWindowSize)
+    }
+
+    /**
+     * Update session context state.
+     */
+    updateSession(session: Session): void {
+        session.context.filesInContext = this.getFilesInContext()
+        session.context.tokenUsage = this.getUsage()
+        session.context.needsCompression = this.needsCompression()
+    }
+
+    /**
+     * Compress context using LLM to summarize old messages.
+     */
+    async compress(session: Session, llm: ILLMClient): Promise<CompressionResult> {
+        const history = session.history
+        if (history.length < MIN_MESSAGES_FOR_COMPRESSION) {
+            return {
+                compressed: false,
+                removedMessages: 0,
+                tokensSaved: 0,
+            }
+        }
+
+        const messagesToCompress = history.slice(0, -MESSAGES_TO_KEEP)
+        const messagesToKeep = history.slice(-MESSAGES_TO_KEEP)
+
+        const tokensBeforeCompression = await this.countHistoryTokens(messagesToCompress, llm)
+
+        const summary = await this.summarizeMessages(messagesToCompress, llm)
+        const summaryTokens = await llm.countTokens(summary)
+
+        const summaryMessage = createSystemMessage(`[Previous conversation summary]\n${summary}`)
+
+        session.history = [summaryMessage, ...messagesToKeep]
+
+        const tokensSaved = tokensBeforeCompression - summaryTokens
+        this.currentTokens -= tokensSaved
+
+        this.updateSession(session)
+
+        return {
+            compressed: true,
+            removedMessages: messagesToCompress.length,
+            tokensSaved,
+            summary,
+        }
+    }
+
+    /**
+     * Create a new context state.
+     */
+    static createInitialState(): ContextState {
+        return {
+            filesInContext: [],
+            tokenUsage: 0,
+            needsCompression: false,
+        }
+    }
+
+    private async summarizeMessages(messages: ChatMessage[], llm: ILLMClient): Promise<string> {
+        const conversation = this.formatMessagesForSummary(messages)
+
+        const response = await llm.chat([
+            createSystemMessage(COMPRESSION_PROMPT),
+            createSystemMessage(conversation),
+        ])
+
+        return response.content
+    }
+
+    private formatMessagesForSummary(messages: ChatMessage[]): string {
+        return messages
+            .filter((m) => m.role !== "tool")
+            .map((m) => {
+                const role = m.role === "user" ? "User" : "Assistant"
+                const content = this.truncateContent(m.content, 500)
+                return `${role}: ${content}`
+            })
+            .join("\n\n")
+    }
+
+    private truncateContent(content: string, maxLength: number): string {
+        if (content.length <= maxLength) {
+            return content
+        }
+        return `${content.slice(0, maxLength)}...`
+    }
+
+    private async countHistoryTokens(messages: ChatMessage[], llm: ILLMClient): Promise<number> {
+        let total = 0
+        for (const message of messages) {
+            total += await llm.countTokens(message.content)
+        }
+        return total
+    }
+}

packages/ipuaro/src/application/use-cases/HandleMessage.ts

@@ -0,0 +1,383 @@
+import { randomUUID } from "node:crypto"
+import type { Session } from "../../domain/entities/Session.js"
+import type { ILLMClient } from "../../domain/services/ILLMClient.js"
+import type { ISessionStorage } from "../../domain/services/ISessionStorage.js"
+import type { IStorage } from "../../domain/services/IStorage.js"
+import type { DiffInfo, ToolContext } from "../../domain/services/ITool.js"
+import {
+    type ChatMessage,
+    createAssistantMessage,
+    createSystemMessage,
+    createToolMessage,
+    createUserMessage,
+} from "../../domain/value-objects/ChatMessage.js"
+import type { ToolCall } from "../../domain/value-objects/ToolCall.js"
+import { createErrorResult, type ToolResult } from "../../domain/value-objects/ToolResult.js"
+import { createUndoEntry, type UndoEntry } from "../../domain/value-objects/UndoEntry.js"
+import { IpuaroError } from "../../shared/errors/IpuaroError.js"
+import type { ErrorChoice } from "../../shared/types/index.js"
+import {
+    buildInitialContext,
+    type ProjectStructure,
+    SYSTEM_PROMPT,
+} from "../../infrastructure/llm/prompts.js"
+import { parseToolCalls } from "../../infrastructure/llm/ResponseParser.js"
+import type { IToolRegistry } from "../interfaces/IToolRegistry.js"
+import { ContextManager } from "./ContextManager.js"
+
+/**
+ * Status during message handling.
+ */
+export type HandleMessageStatus =
+    | "ready"
+    | "thinking"
+    | "tool_call"
+    | "awaiting_confirmation"
+    | "error"
+
+/**
+ * Edit request for confirmation.
+ */
+export interface EditRequest {
+    toolCall: ToolCall
+    filePath: string
+    description: string
+    diff?: DiffInfo
+}
+
+/**
+ * User's choice for edit confirmation.
+ */
+export type EditChoice = "apply" | "skip" | "edit" | "abort"
+
+/**
+ * Event callbacks for HandleMessage.
+ */
+export interface HandleMessageEvents {
+    onMessage?: (message: ChatMessage) => void
+    onToolCall?: (call: ToolCall) => void
+    onToolResult?: (result: ToolResult) => void
+    onConfirmation?: (message: string, diff?: DiffInfo) => Promise<boolean>
+    onError?: (error: IpuaroError) => Promise<ErrorChoice>
+    onStatusChange?: (status: HandleMessageStatus) => void
+    onUndoEntry?: (entry: UndoEntry) => void
+}
+
+/**
+ * Options for HandleMessage.
+ */
+export interface HandleMessageOptions {
+    autoApply?: boolean
+    maxToolCalls?: number
+}
+
+const DEFAULT_MAX_TOOL_CALLS = 20
+
+/**
+ * Use case for handling a user message.
+ * Main orchestrator for the LLM interaction loop.
+ */
+export class HandleMessage {
+    private readonly storage: IStorage
+    private readonly sessionStorage: ISessionStorage
+    private readonly llm: ILLMClient
+    private readonly tools: IToolRegistry
+    private readonly contextManager: ContextManager
+    private readonly projectRoot: string
+    private projectStructure?: ProjectStructure
+
+    private events: HandleMessageEvents = {}
+    private options: HandleMessageOptions = {}
+    private aborted = false
+
+    constructor(
+        storage: IStorage,
+        sessionStorage: ISessionStorage,
+        llm: ILLMClient,
+        tools: IToolRegistry,
+        projectRoot: string,
+    ) {
+        this.storage = storage
+        this.sessionStorage = sessionStorage
+        this.llm = llm
+        this.tools = tools
+        this.projectRoot = projectRoot
+        this.contextManager = new ContextManager(llm.getContextWindowSize())
+    }
+
+    /**
+     * Set event callbacks.
+     */
+    setEvents(events: HandleMessageEvents): void {
+        this.events = events
+    }
+
+    /**
+     * Set options.
+     */
+    setOptions(options: HandleMessageOptions): void {
+        this.options = options
+    }
+
+    /**
+     * Set project structure for context building.
+     */
+    setProjectStructure(structure: ProjectStructure): void {
+        this.projectStructure = structure
+    }
+
+    /**
+     * Abort current processing.
+     */
+    abort(): void {
+        this.aborted = true
+        this.llm.abort()
+    }
+
+    /**
+     * Execute the message handling flow.
+     */
+    async execute(session: Session, message: string): Promise<void> {
+        this.aborted = false
+        this.contextManager.syncFromSession(session)
+
+        if (message.trim()) {
+            const userMessage = createUserMessage(message)
+            session.addMessage(userMessage)
+            session.addInputToHistory(message)
+            this.emitMessage(userMessage)
+        }
+
+        await this.sessionStorage.saveSession(session)
+
+        this.emitStatus("thinking")
+
+        let toolCallCount = 0
+        const maxToolCalls = this.options.maxToolCalls ?? DEFAULT_MAX_TOOL_CALLS
+
+        while (!this.aborted) {
+            const messages = await this.buildMessages(session)
+
+            const startTime = Date.now()
+            let response
+
+            try {
+                response = await this.llm.chat(messages)
+            } catch (error) {
+                await this.handleLLMError(error, session)
+                return
+            }
+
+            if (this.aborted) {
+                return
+            }
+
+            const parsed = parseToolCalls(response.content)
+            const timeMs = Date.now() - startTime
+
+            if (parsed.toolCalls.length === 0) {
+                const assistantMessage = createAssistantMessage(parsed.content, undefined, {
+                    tokens: response.tokens,
+                    timeMs,
+                    toolCalls: 0,
+                })
+                session.addMessage(assistantMessage)
+                this.emitMessage(assistantMessage)
+                this.contextManager.addTokens(response.tokens)
+                this.contextManager.updateSession(session)
+                await this.sessionStorage.saveSession(session)
+                this.emitStatus("ready")
+                return
+            }
+
+            const assistantMessage = createAssistantMessage(parsed.content, parsed.toolCalls, {
+                tokens: response.tokens,
+                timeMs,
+                toolCalls: parsed.toolCalls.length,
+            })
+            session.addMessage(assistantMessage)
+            this.emitMessage(assistantMessage)
+
+            toolCallCount += parsed.toolCalls.length
+            if (toolCallCount > maxToolCalls) {
+                const errorMsg = `Maximum tool calls (${String(maxToolCalls)}) exceeded`
+                const errorMessage = createSystemMessage(errorMsg)
+                session.addMessage(errorMessage)
+                this.emitMessage(errorMessage)
+                this.emitStatus("ready")
+                return
+            }
+
+            this.emitStatus("tool_call")
+
+            const results: ToolResult[] = []
+
+            for (const toolCall of parsed.toolCalls) {
+                if (this.aborted) {
+                    return
+                }
+
+                this.emitToolCall(toolCall)
+
+                const result = await this.executeToolCall(toolCall, session)
+                results.push(result)
+                this.emitToolResult(result)
+            }
+
+            const toolMessage = createToolMessage(results)
+            session.addMessage(toolMessage)
+
+            this.contextManager.addTokens(response.tokens)
+
+            if (this.contextManager.needsCompression()) {
+                await this.contextManager.compress(session, this.llm)
+            }
+
+            this.contextManager.updateSession(session)
+            await this.sessionStorage.saveSession(session)
+
+            this.emitStatus("thinking")
+        }
+    }
+
+    private async buildMessages(session: Session): Promise<ChatMessage[]> {
+        const messages: ChatMessage[] = []
+
+        messages.push(createSystemMessage(SYSTEM_PROMPT))
+
+        if (this.projectStructure) {
+            const asts = await this.storage.getAllASTs()
+            const metas = await this.storage.getAllMetas()
+            const context = buildInitialContext(this.projectStructure, asts, metas)
+            messages.push(createSystemMessage(context))
+        }
+
+        messages.push(...session.history)
+
+        return messages
+    }
+
+    private async executeToolCall(toolCall: ToolCall, session: Session): Promise<ToolResult> {
+        const startTime = Date.now()
+        const tool = this.tools.get(toolCall.name)
+
+        if (!tool) {
+            return createErrorResult(
+                toolCall.id,
+                `Unknown tool: ${toolCall.name}`,
+                Date.now() - startTime,
+            )
+        }
+
+        const context: ToolContext = {
+            projectRoot: this.projectRoot,
+            storage: this.storage,
+            requestConfirmation: async (msg: string, diff?: DiffInfo) => {
+                return this.handleConfirmation(msg, diff, toolCall, session)
+            },
+            onProgress: (_msg: string) => {
+                this.events.onStatusChange?.("tool_call")
+            },
+        }
+
+        try {
+            const validationError = tool.validateParams(toolCall.params)
+            if (validationError) {
+                return createErrorResult(toolCall.id, validationError, Date.now() - startTime)
+            }
+
+            const result = await tool.execute(toolCall.params, context)
+            return result
+        } catch (error) {
+            const errorMessage = error instanceof Error ? error.message : String(error)
+            return createErrorResult(toolCall.id, errorMessage, Date.now() - startTime)
+        }
+    }
+
+    private async handleConfirmation(
+        msg: string,
+        diff: DiffInfo | undefined,
+        toolCall: ToolCall,
+        session: Session,
+    ): Promise<boolean> {
+        if (this.options.autoApply) {
+            if (diff) {
+                this.createUndoEntryFromDiff(diff, toolCall, session)
+            }
+            return true
+        }
+
+        this.emitStatus("awaiting_confirmation")
+
+        if (this.events.onConfirmation) {
+            const confirmed = await this.events.onConfirmation(msg, diff)
+
+            if (confirmed && diff) {
+                this.createUndoEntryFromDiff(diff, toolCall, session)
+            }
+
+            return confirmed
+        }
+
+        if (diff) {
+            this.createUndoEntryFromDiff(diff, toolCall, session)
+        }
+        return true
+    }
+
+    private createUndoEntryFromDiff(diff: DiffInfo, toolCall: ToolCall, session: Session): void {
+        const entry = createUndoEntry(
+            randomUUID(),
+            diff.filePath,
+            diff.oldLines,
+            diff.newLines,
+            `${toolCall.name}: ${diff.filePath}`,
+            toolCall.id,
+        )
+
+        session.addUndoEntry(entry)
+        void this.sessionStorage.pushUndoEntry(session.id, entry)
+        session.stats.editsApplied++
+        this.events.onUndoEntry?.(entry)
+    }
+
+    private async handleLLMError(error: unknown, session: Session): Promise<void> {
+        this.emitStatus("error")
+
+        const ipuaroError =
+            error instanceof IpuaroError
+                ? error
+                : IpuaroError.llm(error instanceof Error ? error.message : String(error))
+
+        if (this.events.onError) {
+            const choice = await this.events.onError(ipuaroError)
+
+            if (choice === "retry") {
+                this.emitStatus("thinking")
+                return this.execute(session, "")
+            }
+        }
+
+        const errorMessage = createSystemMessage(`Error: ${ipuaroError.message}`)
+        session.addMessage(errorMessage)
+        this.emitMessage(errorMessage)
+
+        this.emitStatus("ready")
+    }
+
+    private emitMessage(message: ChatMessage): void {
+        this.events.onMessage?.(message)
+    }
+
+    private emitToolCall(call: ToolCall): void {
+        this.events.onToolCall?.(call)
+    }
+
+    private emitToolResult(result: ToolResult): void {
+        this.events.onToolResult?.(result)
+    }
+
+    private emitStatus(status: HandleMessageStatus): void {
+        this.events.onStatusChange?.(status)
+    }
+}

packages/ipuaro/src/application/use-cases/StartSession.ts

@@ -0,0 +1,62 @@
+import { randomUUID } from "node:crypto"
+import { Session } from "../../domain/entities/Session.js"
+import type { ISessionStorage } from "../../domain/services/ISessionStorage.js"
+
+/**
+ * Options for starting a session.
+ */
+export interface StartSessionOptions {
+    /** Force creation of a new session even if one exists */
+    forceNew?: boolean
+    /** Specific session ID to load */
+    sessionId?: string
+}
+
+/**
+ * Result of starting a session.
+ */
+export interface StartSessionResult {
+    session: Session
+    isNew: boolean
+}
+
+/**
+ * Use case for starting a session.
+ * Creates a new session or loads the latest one for a project.
+ */
+export class StartSession {
+    constructor(private readonly sessionStorage: ISessionStorage) {}
+
+    /**
+     * Execute the use case.
+     *
+     * @param projectName - The project name to start a session for
+     * @param options - Optional configuration
+     * @returns The session and whether it was newly created
+     */
+    async execute(
+        projectName: string,
+        options: StartSessionOptions = {},
+    ): Promise<StartSessionResult> {
+        if (options.sessionId) {
+            const session = await this.sessionStorage.loadSession(options.sessionId)
+            if (session) {
+                await this.sessionStorage.touchSession(session.id)
+                return { session, isNew: false }
+            }
+        }
+
+        if (!options.forceNew) {
+            const latestSession = await this.sessionStorage.getLatestSession(projectName)
+            if (latestSession) {
+                await this.sessionStorage.touchSession(latestSession.id)
+                return { session: latestSession, isNew: false }
+            }
+        }
+
+        const session = new Session(randomUUID(), projectName)
+        await this.sessionStorage.saveSession(session)
+
+        return { session, isNew: true }
+    }
+}

packages/ipuaro/src/application/use-cases/UndoChange.ts

@@ -0,0 +1,119 @@
+import { promises as fs } from "node:fs"
+import type { Session } from "../../domain/entities/Session.js"
+import type { ISessionStorage } from "../../domain/services/ISessionStorage.js"
+import type { IStorage } from "../../domain/services/IStorage.js"
+import { canUndo, type UndoEntry } from "../../domain/value-objects/UndoEntry.js"
+import { md5 } from "../../shared/utils/hash.js"
+
+/**
+ * Result of undo operation.
+ */
+export interface UndoResult {
+    success: boolean
+    entry?: UndoEntry
+    error?: string
+}
+
+/**
+ * Use case for undoing the last file change.
+ */
+export class UndoChange {
+    constructor(
+        private readonly sessionStorage: ISessionStorage,
+        private readonly storage: IStorage,
+    ) {}
+
+    /**
+     * Execute undo operation.
+     *
+     * @param session - The current session
+     * @returns Result of the undo operation
+     */
+    async execute(session: Session): Promise<UndoResult> {
+        const entry = await this.sessionStorage.popUndoEntry(session.id)
+        if (!entry) {
+            return {
+                success: false,
+                error: "No changes to undo",
+            }
+        }
+
+        try {
+            const currentContent = await this.readCurrentContent(entry.filePath)
+
+            if (!canUndo(entry, currentContent)) {
+                await this.sessionStorage.pushUndoEntry(session.id, entry)
+                return {
+                    success: false,
+                    entry,
+                    error: "File has been modified since the change was made",
+                }
+            }
+
+            await this.restoreContent(entry.filePath, entry.previousContent)
+
+            session.popUndoEntry()
+            session.stats.editsApplied--
+
+            return {
+                success: true,
+                entry,
+            }
+        } catch (error) {
+            await this.sessionStorage.pushUndoEntry(session.id, entry)
+
+            const message = error instanceof Error ? error.message : "Unknown error"
+            return {
+                success: false,
+                entry,
+                error: `Failed to undo: ${message}`,
+            }
+        }
+    }
+
+    /**
+     * Check if undo is available.
+     */
+    async canUndo(session: Session): Promise<boolean> {
+        const stack = await this.sessionStorage.getUndoStack(session.id)
+        return stack.length > 0
+    }
+
+    /**
+     * Get the next undo entry without removing it.
+     */
+    async peekUndoEntry(session: Session): Promise<UndoEntry | null> {
+        const stack = await this.sessionStorage.getUndoStack(session.id)
+        if (stack.length === 0) {
+            return null
+        }
+        return stack[stack.length - 1]
+    }
+
+    private async readCurrentContent(filePath: string): Promise<string[]> {
+        try {
+            const content = await fs.readFile(filePath, "utf-8")
+            return content.split("\n")
+        } catch (error) {
+            if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+                return []
+            }
+            throw error
+        }
+    }
+
+    private async restoreContent(filePath: string, content: string[]): Promise<void> {
+        const fileContent = content.join("\n")
+        await fs.writeFile(filePath, fileContent, "utf-8")
+
+        const hash = md5(fileContent)
+        const stats = await fs.stat(filePath)
+
+        await this.storage.setFile(filePath, {
+            lines: content,
+            hash,
+            size: stats.size,
+            lastModified: stats.mtimeMs,
+        })
+    }
+}

packages/ipuaro/src/application/use-cases/index.ts

@@ -1,4 +1,6 @@
-/*
- * Application Use Cases
- * Will be implemented in version 0.10.0+
- */
+// Application Use Cases
+
+export * from "./StartSession.js"
+export * from "./HandleMessage.js"
+export * from "./UndoChange.js"
+export * from "./ContextManager.js"

packages/ipuaro/src/domain/services/ISessionStorage.ts

@@ -0,0 +1,88 @@
+import type { ContextState, Session, SessionStats } from "../entities/Session.js"
+import type { ChatMessage } from "../value-objects/ChatMessage.js"
+import type { UndoEntry } from "../value-objects/UndoEntry.js"
+
+/**
+ * Session data stored in persistence layer.
+ */
+export interface SessionData {
+    id: string
+    projectName: string
+    createdAt: number
+    lastActivityAt: number
+    history: ChatMessage[]
+    context: ContextState
+    stats: SessionStats
+    inputHistory: string[]
+}
+
+/**
+ * Session list item (minimal info for listing).
+ */
+export interface SessionListItem {
+    id: string
+    projectName: string
+    createdAt: number
+    lastActivityAt: number
+    messageCount: number
+}
+
+/**
+ * Storage service interface for session persistence.
+ */
+export interface ISessionStorage {
+    /**
+     * Save a session to storage.
+     */
+    saveSession(session: Session): Promise<void>
+
+    /**
+     * Load a session by ID.
+     */
+    loadSession(sessionId: string): Promise<Session | null>
+
+    /**
+     * Delete a session.
+     */
+    deleteSession(sessionId: string): Promise<void>
+
+    /**
+     * Get list of all sessions for a project.
+     */
+    listSessions(projectName?: string): Promise<SessionListItem[]>
+
+    /**
+     * Get the latest session for a project.
+     */
+    getLatestSession(projectName: string): Promise<Session | null>
+
+    /**
+     * Check if a session exists.
+     */
+    sessionExists(sessionId: string): Promise<boolean>
+
+    /**
+     * Add undo entry to session's undo stack.
+     */
+    pushUndoEntry(sessionId: string, entry: UndoEntry): Promise<void>
+
+    /**
+     * Pop undo entry from session's undo stack.
+     */
+    popUndoEntry(sessionId: string): Promise<UndoEntry | null>
+
+    /**
+     * Get undo stack for a session.
+     */
+    getUndoStack(sessionId: string): Promise<UndoEntry[]>
+
+    /**
+     * Update session's last activity timestamp.
+     */
+    touchSession(sessionId: string): Promise<void>
+
+    /**
+     * Clear all sessions.
+     */
+    clearAllSessions(): Promise<void>
+}

packages/ipuaro/src/domain/services/index.ts

@@ -1,5 +1,6 @@
 // Domain Service Interfaces (Ports)
 export * from "./IStorage.js"
+export * from "./ISessionStorage.js"
 export * from "./ILLMClient.js"
 export * from "./ITool.js"
 export * from "./IIndexer.js"

packages/ipuaro/src/infrastructure/storage/RedisSessionStorage.ts

@@ -0,0 +1,225 @@
+import type { ISessionStorage, SessionListItem } from "../../domain/services/ISessionStorage.js"
+import { type ContextState, Session, type SessionStats } from "../../domain/entities/Session.js"
+import type { ChatMessage } from "../../domain/value-objects/ChatMessage.js"
+import type { UndoEntry } from "../../domain/value-objects/UndoEntry.js"
+import { MAX_UNDO_STACK_SIZE } from "../../domain/constants/index.js"
+import { IpuaroError } from "../../shared/errors/IpuaroError.js"
+import { RedisClient } from "./RedisClient.js"
+import { SessionFields, SessionKeys } from "./schema.js"
+
+/**
+ * Redis implementation of ISessionStorage.
+ * Stores session data in Redis hashes and lists.
+ */
+export class RedisSessionStorage implements ISessionStorage {
+    private readonly client: RedisClient
+
+    constructor(client: RedisClient) {
+        this.client = client
+    }
+
+    async saveSession(session: Session): Promise<void> {
+        const redis = this.getRedis()
+        const dataKey = SessionKeys.data(session.id)
+
+        const pipeline = redis.pipeline()
+
+        pipeline.hset(dataKey, SessionFields.projectName, session.projectName)
+        pipeline.hset(dataKey, SessionFields.createdAt, String(session.createdAt))
+        pipeline.hset(dataKey, SessionFields.lastActivityAt, String(session.lastActivityAt))
+        pipeline.hset(dataKey, SessionFields.history, JSON.stringify(session.history))
+        pipeline.hset(dataKey, SessionFields.context, JSON.stringify(session.context))
+        pipeline.hset(dataKey, SessionFields.stats, JSON.stringify(session.stats))
+        pipeline.hset(dataKey, SessionFields.inputHistory, JSON.stringify(session.inputHistory))
+
+        await this.addToSessionsList(session.id)
+
+        await pipeline.exec()
+    }
+
+    async loadSession(sessionId: string): Promise<Session | null> {
+        const redis = this.getRedis()
+        const dataKey = SessionKeys.data(sessionId)
+
+        const data = await redis.hgetall(dataKey)
+        if (!data || Object.keys(data).length === 0) {
+            return null
+        }
+
+        const session = new Session(
+            sessionId,
+            data[SessionFields.projectName],
+            Number(data[SessionFields.createdAt]),
+        )
+
+        session.lastActivityAt = Number(data[SessionFields.lastActivityAt])
+        session.history = this.parseJSON(data[SessionFields.history], "history") as ChatMessage[]
+        session.context = this.parseJSON(data[SessionFields.context], "context") as ContextState
+        session.stats = this.parseJSON(data[SessionFields.stats], "stats") as SessionStats
+        session.inputHistory = this.parseJSON(
+            data[SessionFields.inputHistory],
+            "inputHistory",
+        ) as string[]
+
+        const undoStack = await this.getUndoStack(sessionId)
+        for (const entry of undoStack) {
+            session.undoStack.push(entry)
+        }
+
+        return session
+    }
+
+    async deleteSession(sessionId: string): Promise<void> {
+        const redis = this.getRedis()
+
+        await Promise.all([
+            redis.del(SessionKeys.data(sessionId)),
+            redis.del(SessionKeys.undo(sessionId)),
+            redis.lrem(SessionKeys.list, 0, sessionId),
+        ])
+    }
+
+    async listSessions(projectName?: string): Promise<SessionListItem[]> {
+        const redis = this.getRedis()
+        const sessionIds = await redis.lrange(SessionKeys.list, 0, -1)
+
+        const sessions: SessionListItem[] = []
+
+        for (const id of sessionIds) {
+            const data = await redis.hgetall(SessionKeys.data(id))
+            if (!data || Object.keys(data).length === 0) {
+                continue
+            }
+
+            const sessionProjectName = data[SessionFields.projectName]
+            if (projectName && sessionProjectName !== projectName) {
+                continue
+            }
+
+            const history = this.parseJSON(data[SessionFields.history], "history") as ChatMessage[]
+
+            sessions.push({
+                id,
+                projectName: sessionProjectName,
+                createdAt: Number(data[SessionFields.createdAt]),
+                lastActivityAt: Number(data[SessionFields.lastActivityAt]),
+                messageCount: history.length,
+            })
+        }
+
+        sessions.sort((a, b) => b.lastActivityAt - a.lastActivityAt)
+
+        return sessions
+    }
+
+    async getLatestSession(projectName: string): Promise<Session | null> {
+        const sessions = await this.listSessions(projectName)
+        if (sessions.length === 0) {
+            return null
+        }
+
+        return this.loadSession(sessions[0].id)
+    }
+
+    async sessionExists(sessionId: string): Promise<boolean> {
+        const redis = this.getRedis()
+        const exists = await redis.exists(SessionKeys.data(sessionId))
+        return exists === 1
+    }
+
+    async pushUndoEntry(sessionId: string, entry: UndoEntry): Promise<void> {
+        const redis = this.getRedis()
+        const undoKey = SessionKeys.undo(sessionId)
+
+        await redis.rpush(undoKey, JSON.stringify(entry))
+
+        const length = await redis.llen(undoKey)
+        if (length > MAX_UNDO_STACK_SIZE) {
+            await redis.lpop(undoKey)
+        }
+    }
+
+    async popUndoEntry(sessionId: string): Promise<UndoEntry | null> {
+        const redis = this.getRedis()
+        const undoKey = SessionKeys.undo(sessionId)
+
+        const data = await redis.rpop(undoKey)
+        if (!data) {
+            return null
+        }
+
+        return this.parseJSON(data, "UndoEntry") as UndoEntry
+    }
+
+    async getUndoStack(sessionId: string): Promise<UndoEntry[]> {
+        const redis = this.getRedis()
+        const undoKey = SessionKeys.undo(sessionId)
+
+        const entries = await redis.lrange(undoKey, 0, -1)
+        return entries.map((entry) => this.parseJSON(entry, "UndoEntry") as UndoEntry)
+    }
+
+    async touchSession(sessionId: string): Promise<void> {
+        const redis = this.getRedis()
+        await redis.hset(
+            SessionKeys.data(sessionId),
+            SessionFields.lastActivityAt,
+            String(Date.now()),
+        )
+    }
+
+    async clearAllSessions(): Promise<void> {
+        const redis = this.getRedis()
+        const sessionIds = await redis.lrange(SessionKeys.list, 0, -1)
+
+        const pipeline = redis.pipeline()
+        for (const id of sessionIds) {
+            pipeline.del(SessionKeys.data(id))
+            pipeline.del(SessionKeys.undo(id))
+        }
+        pipeline.del(SessionKeys.list)
+
+        await pipeline.exec()
+    }
+
+    private async addToSessionsList(sessionId: string): Promise<void> {
+        const redis = this.getRedis()
+
+        const exists = await redis.lpos(SessionKeys.list, sessionId)
+        if (exists === null) {
+            await redis.lpush(SessionKeys.list, sessionId)
+        }
+    }
+
+    private getRedis(): ReturnType<RedisClient["getClient"]> {
+        return this.client.getClient()
+    }
+
+    private parseJSON(data: string | undefined, type: string): unknown {
+        if (!data) {
+            if (type === "history" || type === "inputHistory") {
+                return []
+            }
+            if (type === "context") {
+                return { filesInContext: [], tokenUsage: 0, needsCompression: false }
+            }
+            if (type === "stats") {
+                return {
+                    totalTokens: 0,
+                    totalTimeMs: 0,
+                    toolCalls: 0,
+                    editsApplied: 0,
+                    editsRejected: 0,
+                }
+            }
+            return null
+        }
+
+        try {
+            return JSON.parse(data) as unknown
+        } catch (error) {
+            const message = error instanceof Error ? error.message : "Unknown error"
+            throw IpuaroError.parse(`Failed to parse ${type}: ${message}`)
+        }
+    }
+}

packages/ipuaro/src/infrastructure/storage/index.ts

@@ -1,6 +1,7 @@
 // Storage module exports
 export { RedisClient } from "./RedisClient.js"
 export { RedisStorage } from "./RedisStorage.js"
+export { RedisSessionStorage } from "./RedisSessionStorage.js"
 export {
     ProjectKeys,
     SessionKeys,

packages/ipuaro/src/infrastructure/tools/run/RunTestsTool.ts

@@ -150,12 +150,9 @@ export class RunTestsTool implements ITool {
                 return createSuccessResult(callId, result, Date.now() - startTime)
             } catch (error) {
                 return this.handleExecError(
-                    callId,
-                    runner,
-                    command,
+                    { callId, runner, command, startTime },
                     error,
                     execStartTime,
-                    startTime,
                 )
             }
         } catch (error) {
@@ -168,25 +165,37 @@ export class RunTestsTool implements ITool {
      * Detect which test runner is available in the project.
      */
     async detectTestRunner(projectRoot: string): Promise<TestRunner | null> {
-        if (await this.hasFile(projectRoot, "vitest.config.ts")) {
-            return "vitest"
-        }
-        if (await this.hasFile(projectRoot, "vitest.config.js")) {
-            return "vitest"
-        }
-        if (await this.hasFile(projectRoot, "vitest.config.mts")) {
-            return "vitest"
-        }
-        if (await this.hasFile(projectRoot, "jest.config.js")) {
-            return "jest"
-        }
-        if (await this.hasFile(projectRoot, "jest.config.ts")) {
-            return "jest"
-        }
-        if (await this.hasFile(projectRoot, "jest.config.json")) {
-            return "jest"
+        const configRunner = await this.detectByConfigFile(projectRoot)
+        if (configRunner) {
+            return configRunner
         }
 
+        return this.detectByPackageJson(projectRoot)
+    }
+
+    private async detectByConfigFile(projectRoot: string): Promise<TestRunner | null> {
+        const configFiles: { files: string[]; runner: TestRunner }[] = [
+            {
+                files: ["vitest.config.ts", "vitest.config.js", "vitest.config.mts"],
+                runner: "vitest",
+            },
+            {
+                files: ["jest.config.js", "jest.config.ts", "jest.config.json"],
+                runner: "jest",
+            },
+        ]
+
+        for (const { files, runner } of configFiles) {
+            for (const file of files) {
+                if (await this.hasFile(projectRoot, file)) {
+                    return runner
+                }
+            }
+        }
+        return null
+    }
+
+    private async detectByPackageJson(projectRoot: string): Promise<TestRunner | null> {
         const packageJsonPath = path.join(projectRoot, "package.json")
         try {
             const content = await this.fsReadFile(packageJsonPath, "utf-8")
@@ -196,23 +205,22 @@ export class RunTestsTool implements ITool {
                 dependencies?: Record<string, string>
             }
 
-            if (pkg.devDependencies?.vitest || pkg.dependencies?.vitest) {
+            const deps = { ...pkg.devDependencies, ...pkg.dependencies }
+            if (deps.vitest) {
                 return "vitest"
             }
-            if (pkg.devDependencies?.jest || pkg.dependencies?.jest) {
+            if (deps.jest) {
                 return "jest"
             }
-            if (pkg.devDependencies?.mocha || pkg.dependencies?.mocha) {
+            if (deps.mocha) {
                 return "mocha"
             }
-
             if (pkg.scripts?.test) {
                 return "npm"
             }
         } catch {
             // package.json doesn't exist or is invalid
         }
-
         return null
     }
 
@@ -220,63 +228,69 @@ export class RunTestsTool implements ITool {
      * Build the test command based on runner and options.
      */
     buildCommand(runner: TestRunner, testPath?: string, filter?: string, watch?: boolean): string {
-        const parts: string[] = []
-
-        switch (runner) {
-            case "vitest":
-                parts.push("npx vitest")
-                if (!watch) {
-                    parts.push("run")
-                }
-                if (testPath) {
-                    parts.push(testPath)
-                }
-                if (filter) {
-                    parts.push("-t", `"${filter}"`)
-                }
-                break
-
-            case "jest":
-                parts.push("npx jest")
-                if (testPath) {
-                    parts.push(testPath)
-                }
-                if (filter) {
-                    parts.push("-t", `"${filter}"`)
-                }
-                if (watch) {
-                    parts.push("--watch")
-                }
-                break
-
-            case "mocha":
-                parts.push("npx mocha")
-                if (testPath) {
-                    parts.push(testPath)
-                }
-                if (filter) {
-                    parts.push("--grep", `"${filter}"`)
-                }
-                if (watch) {
-                    parts.push("--watch")
-                }
-                break
-
-            case "npm":
-                parts.push("npm test")
-                if (testPath || filter) {
-                    parts.push("--")
-                    if (testPath) {
-                        parts.push(testPath)
-                    }
-                    if (filter) {
-                        parts.push(`"${filter}"`)
-                    }
-                }
-                break
+        const builders: Record<TestRunner, () => string[]> = {
+            vitest: () => this.buildVitestCommand(testPath, filter, watch),
+            jest: () => this.buildJestCommand(testPath, filter, watch),
+            mocha: () => this.buildMochaCommand(testPath, filter, watch),
+            npm: () => this.buildNpmCommand(testPath, filter),
         }
+        return builders[runner]().join(" ")
+    }
 
-        return parts.join(" ")
+    private buildVitestCommand(testPath?: string, filter?: string, watch?: boolean): string[] {
+        const parts = ["npx vitest"]
+        if (!watch) {
+            parts.push("run")
+        }
+        if (testPath) {
+            parts.push(testPath)
+        }
+        if (filter) {
+            parts.push("-t", `"${filter}"`)
+        }
+        return parts
+    }
+
+    private buildJestCommand(testPath?: string, filter?: string, watch?: boolean): string[] {
+        const parts = ["npx jest"]
+        if (testPath) {
+            parts.push(testPath)
+        }
+        if (filter) {
+            parts.push("-t", `"${filter}"`)
+        }
+        if (watch) {
+            parts.push("--watch")
+        }
+        return parts
+    }
+
+    private buildMochaCommand(testPath?: string, filter?: string, watch?: boolean): string[] {
+        const parts = ["npx mocha"]
+        if (testPath) {
+            parts.push(testPath)
+        }
+        if (filter) {
+            parts.push("--grep", `"${filter}"`)
+        }
+        if (watch) {
+            parts.push("--watch")
+        }
+        return parts
+    }
+
+    private buildNpmCommand(testPath?: string, filter?: string): string[] {
+        const parts = ["npm test"]
+        if (testPath || filter) {
+            parts.push("--")
+            if (testPath) {
+                parts.push(testPath)
+            }
+            if (filter) {
+                parts.push(`"${filter}"`)
+            }
+        }
+        return parts
     }
 
     /**
@@ -295,13 +309,11 @@ export class RunTestsTool implements ITool {
      * Handle exec errors and return appropriate result.
      */
     private handleExecError(
-        callId: string,
-        runner: TestRunner,
-        command: string,
+        ctx: { callId: string; runner: TestRunner; command: string; startTime: number },
         error: unknown,
         execStartTime: number,
-        startTime: number,
     ): ToolResult {
+        const { callId, runner, command, startTime } = ctx
         const durationMs = Date.now() - execStartTime
 
         if (this.isExecError(error)) {

packages/ipuaro/tests/unit/application/use-cases/ContextManager.test.ts

@@ -0,0 +1,248 @@
+import { describe, it, expect, vi, beforeEach } from "vitest"
+import { ContextManager } from "../../../../src/application/use-cases/ContextManager.js"
+import { Session } from "../../../../src/domain/entities/Session.js"
+import type { ILLMClient, LLMResponse } from "../../../../src/domain/services/ILLMClient.js"
+import {
+    createUserMessage,
+    createAssistantMessage,
+} from "../../../../src/domain/value-objects/ChatMessage.js"
+
+describe("ContextManager", () => {
+    let manager: ContextManager
+    const CONTEXT_SIZE = 128_000
+
+    beforeEach(() => {
+        manager = new ContextManager(CONTEXT_SIZE)
+    })
+
+    describe("addToContext", () => {
+        it("should add file to context", () => {
+            manager.addToContext("test.ts", 100)
+
+            expect(manager.getFilesInContext()).toContain("test.ts")
+            expect(manager.getTokenCount()).toBe(100)
+        })
+
+        it("should update token count when same file added", () => {
+            manager.addToContext("test.ts", 100)
+            manager.addToContext("test.ts", 200)
+
+            expect(manager.getFilesInContext()).toHaveLength(1)
+            expect(manager.getTokenCount()).toBe(200)
+        })
+
+        it("should accumulate tokens for different files", () => {
+            manager.addToContext("a.ts", 100)
+            manager.addToContext("b.ts", 200)
+
+            expect(manager.getFilesInContext()).toHaveLength(2)
+            expect(manager.getTokenCount()).toBe(300)
+        })
+    })
+
+    describe("removeFromContext", () => {
+        it("should remove file from context", () => {
+            manager.addToContext("test.ts", 100)
+            manager.removeFromContext("test.ts")
+
+            expect(manager.getFilesInContext()).not.toContain("test.ts")
+            expect(manager.getTokenCount()).toBe(0)
+        })
+
+        it("should handle removing non-existent file", () => {
+            manager.removeFromContext("non-existent.ts")
+
+            expect(manager.getTokenCount()).toBe(0)
+        })
+    })
+
+    describe("getUsage", () => {
+        it("should return 0 for empty context", () => {
+            expect(manager.getUsage()).toBe(0)
+        })
+
+        it("should calculate usage ratio correctly", () => {
+            manager.addToContext("test.ts", CONTEXT_SIZE / 2)
+
+            expect(manager.getUsage()).toBe(0.5)
+        })
+    })
+
+    describe("getAvailableTokens", () => {
+        it("should return full context when empty", () => {
+            expect(manager.getAvailableTokens()).toBe(CONTEXT_SIZE)
+        })
+
+        it("should calculate available tokens correctly", () => {
+            manager.addToContext("test.ts", 1000)
+
+            expect(manager.getAvailableTokens()).toBe(CONTEXT_SIZE - 1000)
+        })
+    })
+
+    describe("needsCompression", () => {
+        it("should return false when under threshold", () => {
+            manager.addToContext("test.ts", CONTEXT_SIZE * 0.5)
+
+            expect(manager.needsCompression()).toBe(false)
+        })
+
+        it("should return true when over threshold", () => {
+            manager.addToContext("test.ts", CONTEXT_SIZE * 0.85)
+
+            expect(manager.needsCompression()).toBe(true)
+        })
+
+        it("should return false at exactly threshold", () => {
+            manager.addToContext("test.ts", CONTEXT_SIZE * 0.8)
+
+            expect(manager.needsCompression()).toBe(false)
+        })
+    })
+
+    describe("addTokens", () => {
+        it("should add tokens to current count", () => {
+            manager.addTokens(500)
+
+            expect(manager.getTokenCount()).toBe(500)
+        })
+
+        it("should accumulate tokens", () => {
+            manager.addTokens(100)
+            manager.addTokens(200)
+
+            expect(manager.getTokenCount()).toBe(300)
+        })
+    })
+
+    describe("syncFromSession", () => {
+        it("should sync files from session context", () => {
+            const session = new Session("test", "project")
+            session.context.filesInContext = ["a.ts", "b.ts"]
+            session.context.tokenUsage = 0.5
+
+            manager.syncFromSession(session)
+
+            expect(manager.getFilesInContext()).toContain("a.ts")
+            expect(manager.getFilesInContext()).toContain("b.ts")
+            expect(manager.getTokenCount()).toBe(Math.floor(0.5 * CONTEXT_SIZE))
+        })
+
+        it("should clear previous state on sync", () => {
+            manager.addToContext("old.ts", 1000)
+
+            const session = new Session("test", "project")
+            session.context.filesInContext = ["new.ts"]
+            session.context.tokenUsage = 0.1
+
+            manager.syncFromSession(session)
+
+            expect(manager.getFilesInContext()).not.toContain("old.ts")
+            expect(manager.getFilesInContext()).toContain("new.ts")
+        })
+    })
+
+    describe("updateSession", () => {
+        it("should update session with current context state", () => {
+            const session = new Session("test", "project")
+
+            manager.addToContext("test.ts", 1000)
+            manager.updateSession(session)
+
+            expect(session.context.filesInContext).toContain("test.ts")
+            expect(session.context.tokenUsage).toBeCloseTo(1000 / CONTEXT_SIZE)
+        })
+
+        it("should set needsCompression flag", () => {
+            const session = new Session("test", "project")
+
+            manager.addToContext("large.ts", CONTEXT_SIZE * 0.9)
+            manager.updateSession(session)
+
+            expect(session.context.needsCompression).toBe(true)
+        })
+    })
+
+    describe("compress", () => {
+        let mockLLM: ILLMClient
+        let session: Session
+
+        beforeEach(() => {
+            mockLLM = {
+                chat: vi.fn().mockResolvedValue({
+                    content: "Summary of previous conversation",
+                    toolCalls: [],
+                    tokens: 50,
+                    timeMs: 100,
+                    truncated: false,
+                    stopReason: "end",
+                } as LLMResponse),
+                countTokens: vi.fn().mockResolvedValue(10),
+                isAvailable: vi.fn().mockResolvedValue(true),
+                getModelName: vi.fn().mockReturnValue("test-model"),
+                getContextWindowSize: vi.fn().mockReturnValue(CONTEXT_SIZE),
+                pullModel: vi.fn().mockResolvedValue(undefined),
+                abort: vi.fn(),
+            }
+
+            session = new Session("test", "project")
+        })
+
+        it("should not compress when history is short", async () => {
+            for (let i = 0; i < 5; i++) {
+                session.addMessage(createUserMessage(`Message ${String(i)}`))
+            }
+
+            const result = await manager.compress(session, mockLLM)
+
+            expect(result.compressed).toBe(false)
+            expect(result.removedMessages).toBe(0)
+        })
+
+        it("should compress when history is long enough", async () => {
+            for (let i = 0; i < 15; i++) {
+                session.addMessage(createUserMessage(`Message ${String(i)}`))
+                session.addMessage(createAssistantMessage(`Response ${String(i)}`))
+            }
+            manager.addToContext("test.ts", 10000)
+
+            const result = await manager.compress(session, mockLLM)
+
+            expect(result.compressed).toBe(true)
+            expect(result.removedMessages).toBeGreaterThan(0)
+            expect(result.summary).toBeDefined()
+        })
+
+        it("should keep recent messages after compression", async () => {
+            for (let i = 0; i < 15; i++) {
+                session.addMessage(createUserMessage(`Message ${String(i)}`))
+            }
+
+            await manager.compress(session, mockLLM)
+
+            expect(session.history.length).toBeLessThan(15)
+            expect(session.history[session.history.length - 1].content).toContain("Message 14")
+        })
+
+        it("should add summary as system message", async () => {
+            for (let i = 0; i < 15; i++) {
+                session.addMessage(createUserMessage(`Message ${String(i)}`))
+            }
+
+            await manager.compress(session, mockLLM)
+
+            expect(session.history[0].role).toBe("system")
+            expect(session.history[0].content).toContain("Summary")
+        })
+    })
+
+    describe("createInitialState", () => {
+        it("should create empty initial state", () => {
+            const state = ContextManager.createInitialState()
+
+            expect(state.filesInContext).toEqual([])
+            expect(state.tokenUsage).toBe(0)
+            expect(state.needsCompression).toBe(false)
+        })
+    })
+})

packages/ipuaro/tests/unit/application/use-cases/HandleMessage.test.ts

@@ -0,0 +1,421 @@
+import { describe, it, expect, vi, beforeEach } from "vitest"
+import { HandleMessage } from "../../../../src/application/use-cases/HandleMessage.js"
+import type { IStorage } from "../../../../src/domain/services/IStorage.js"
+import type { ISessionStorage } from "../../../../src/domain/services/ISessionStorage.js"
+import type { ILLMClient, LLMResponse } from "../../../../src/domain/services/ILLMClient.js"
+import type { IToolRegistry } from "../../../../src/application/interfaces/IToolRegistry.js"
+import type { ITool, ToolContext } from "../../../../src/domain/services/ITool.js"
+import { Session } from "../../../../src/domain/entities/Session.js"
+import { createSuccessResult } from "../../../../src/domain/value-objects/ToolResult.js"
+
+describe("HandleMessage", () => {
+    let useCase: HandleMessage
+    let mockStorage: IStorage
+    let mockSessionStorage: ISessionStorage
+    let mockLLM: ILLMClient
+    let mockTools: IToolRegistry
+    let session: Session
+
+    const createMockLLMResponse = (content: string, toolCalls = false): LLMResponse => ({
+        content,
+        toolCalls: [],
+        tokens: 100,
+        timeMs: 50,
+        truncated: false,
+        stopReason: toolCalls ? "tool_use" : "end",
+    })
+
+    beforeEach(() => {
+        mockStorage = {
+            getFile: vi.fn().mockResolvedValue(null),
+            setFile: vi.fn().mockResolvedValue(undefined),
+            deleteFile: vi.fn().mockResolvedValue(undefined),
+            getAllFiles: vi.fn().mockResolvedValue(new Map()),
+            getFileCount: vi.fn().mockResolvedValue(0),
+            getAST: vi.fn().mockResolvedValue(null),
+            setAST: vi.fn().mockResolvedValue(undefined),
+            deleteAST: vi.fn().mockResolvedValue(undefined),
+            getAllASTs: vi.fn().mockResolvedValue(new Map()),
+            getMeta: vi.fn().mockResolvedValue(null),
+            setMeta: vi.fn().mockResolvedValue(undefined),
+            deleteMeta: vi.fn().mockResolvedValue(undefined),
+            getAllMetas: vi.fn().mockResolvedValue(new Map()),
+            getSymbolIndex: vi.fn().mockResolvedValue(new Map()),
+            setSymbolIndex: vi.fn().mockResolvedValue(undefined),
+            getDepsGraph: vi.fn().mockResolvedValue({ imports: new Map(), importedBy: new Map() }),
+            setDepsGraph: vi.fn().mockResolvedValue(undefined),
+            getProjectConfig: vi.fn().mockResolvedValue(null),
+            setProjectConfig: vi.fn().mockResolvedValue(undefined),
+            connect: vi.fn().mockResolvedValue(undefined),
+            disconnect: vi.fn().mockResolvedValue(undefined),
+            isConnected: vi.fn().mockReturnValue(true),
+            clear: vi.fn().mockResolvedValue(undefined),
+        }
+
+        mockSessionStorage = {
+            saveSession: vi.fn().mockResolvedValue(undefined),
+            loadSession: vi.fn().mockResolvedValue(null),
+            deleteSession: vi.fn().mockResolvedValue(undefined),
+            listSessions: vi.fn().mockResolvedValue([]),
+            getLatestSession: vi.fn().mockResolvedValue(null),
+            sessionExists: vi.fn().mockResolvedValue(false),
+            pushUndoEntry: vi.fn().mockResolvedValue(undefined),
+            popUndoEntry: vi.fn().mockResolvedValue(null),
+            getUndoStack: vi.fn().mockResolvedValue([]),
+            touchSession: vi.fn().mockResolvedValue(undefined),
+            clearAllSessions: vi.fn().mockResolvedValue(undefined),
+        }
+
+        mockLLM = {
+            chat: vi.fn().mockResolvedValue(createMockLLMResponse("Hello!")),
+            countTokens: vi.fn().mockResolvedValue(10),
+            isAvailable: vi.fn().mockResolvedValue(true),
+            getModelName: vi.fn().mockReturnValue("test-model"),
+            getContextWindowSize: vi.fn().mockReturnValue(128_000),
+            pullModel: vi.fn().mockResolvedValue(undefined),
+            abort: vi.fn(),
+        }
+
+        mockTools = {
+            register: vi.fn(),
+            get: vi.fn().mockReturnValue(undefined),
+            getAll: vi.fn().mockReturnValue([]),
+            getByCategory: vi.fn().mockReturnValue([]),
+            has: vi.fn().mockReturnValue(false),
+            execute: vi.fn(),
+            getToolDefinitions: vi.fn().mockReturnValue([]),
+        }
+
+        session = new Session("test-session", "test-project")
+        useCase = new HandleMessage(mockStorage, mockSessionStorage, mockLLM, mockTools, "/project")
+    })
+
+    describe("execute", () => {
+        it("should add user message to session history", async () => {
+            await useCase.execute(session, "Hello, assistant!")
+
+            expect(session.history.length).toBeGreaterThan(0)
+            expect(session.history[0].role).toBe("user")
+            expect(session.history[0].content).toBe("Hello, assistant!")
+        })
+
+        it("should add user input to input history", async () => {
+            await useCase.execute(session, "Test command")
+
+            expect(session.inputHistory).toContain("Test command")
+        })
+
+        it("should save session after user message", async () => {
+            await useCase.execute(session, "Hello")
+
+            expect(mockSessionStorage.saveSession).toHaveBeenCalled()
+        })
+
+        it("should send messages to LLM", async () => {
+            await useCase.execute(session, "What is 2+2?")
+
+            expect(mockLLM.chat).toHaveBeenCalled()
+        })
+
+        it("should add assistant response to history", async () => {
+            vi.mocked(mockLLM.chat).mockResolvedValue(createMockLLMResponse("The answer is 4!"))
+
+            await useCase.execute(session, "What is 2+2?")
+
+            const assistantMessages = session.history.filter((m) => m.role === "assistant")
+            expect(assistantMessages.length).toBeGreaterThan(0)
+            expect(assistantMessages[0].content).toBe("The answer is 4!")
+        })
+
+        it("should not add empty user messages", async () => {
+            await useCase.execute(session, "   ")
+
+            const userMessages = session.history.filter((m) => m.role === "user")
+            expect(userMessages.length).toBe(0)
+        })
+
+        it("should track token usage in message stats", async () => {
+            vi.mocked(mockLLM.chat).mockResolvedValue({
+                content: "Response",
+                toolCalls: [],
+                tokens: 150,
+                timeMs: 200,
+                truncated: false,
+                stopReason: "end",
+            })
+
+            await useCase.execute(session, "Hello")
+
+            const assistantMessage = session.history.find((m) => m.role === "assistant")
+            expect(assistantMessage?.stats?.tokens).toBe(150)
+            expect(assistantMessage?.stats?.timeMs).toBeGreaterThanOrEqual(0)
+        })
+    })
+
+    describe("tool execution", () => {
+        const mockTool: ITool = {
+            name: "get_lines",
+            description: "Get lines from file",
+            parameters: [],
+            requiresConfirmation: false,
+            category: "read",
+            validateParams: vi.fn().mockReturnValue(null),
+            execute: vi.fn().mockResolvedValue(createSuccessResult("test", { lines: [] }, 10)),
+        }
+
+        beforeEach(() => {
+            vi.mocked(mockTools.get).mockReturnValue(mockTool)
+        })
+
+        it("should execute tools when LLM returns tool calls", async () => {
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="get_lines"><path>test.ts</path></tool_call>',
+                        true,
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done!"))
+
+            await useCase.execute(session, "Show me test.ts")
+
+            expect(mockTool.execute).toHaveBeenCalled()
+        })
+
+        it("should add tool results to session", async () => {
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="get_lines"><path>test.ts</path></tool_call>',
+                        true,
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done!"))
+
+            await useCase.execute(session, "Show me test.ts")
+
+            const toolMessages = session.history.filter((m) => m.role === "tool")
+            expect(toolMessages.length).toBeGreaterThan(0)
+        })
+
+        it("should return error for unknown tools", async () => {
+            vi.mocked(mockTools.get).mockReturnValue(undefined)
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="unknown_tool"><param>value</param></tool_call>',
+                        true,
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Sorry, that didn't work"))
+
+            await useCase.execute(session, "Do something")
+
+            const toolMessages = session.history.filter((m) => m.role === "tool")
+            expect(toolMessages[0].content).toContain("Unknown tool")
+        })
+
+        it("should stop after max tool calls exceeded", async () => {
+            useCase.setOptions({ maxToolCalls: 2 })
+
+            vi.mocked(mockLLM.chat).mockResolvedValue(
+                createMockLLMResponse(
+                    '<tool_call name="get_lines"><path>a.ts</path></tool_call>' +
+                        '<tool_call name="get_lines"><path>b.ts</path></tool_call>' +
+                        '<tool_call name="get_lines"><path>c.ts</path></tool_call>',
+                    true,
+                ),
+            )
+
+            await useCase.execute(session, "Show many files")
+
+            const systemMessages = session.history.filter((m) => m.role === "system")
+            const maxExceeded = systemMessages.some((m) => m.content.includes("Maximum tool calls"))
+            expect(maxExceeded).toBe(true)
+        })
+    })
+
+    describe("events", () => {
+        it("should emit message events", async () => {
+            const onMessage = vi.fn()
+            useCase.setEvents({ onMessage })
+
+            await useCase.execute(session, "Hello")
+
+            expect(onMessage).toHaveBeenCalled()
+        })
+
+        it("should emit status changes", async () => {
+            const onStatusChange = vi.fn()
+            useCase.setEvents({ onStatusChange })
+
+            await useCase.execute(session, "Hello")
+
+            expect(onStatusChange).toHaveBeenCalledWith("thinking")
+            expect(onStatusChange).toHaveBeenCalledWith("ready")
+        })
+
+        it("should emit tool call events", async () => {
+            const onToolCall = vi.fn()
+            useCase.setEvents({ onToolCall })
+
+            const mockTool: ITool = {
+                name: "get_lines",
+                description: "Test",
+                parameters: [],
+                requiresConfirmation: false,
+                category: "read",
+                validateParams: vi.fn().mockReturnValue(null),
+                execute: vi.fn().mockResolvedValue(createSuccessResult("test", {}, 10)),
+            }
+            vi.mocked(mockTools.get).mockReturnValue(mockTool)
+
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="get_lines"><path>test.ts</path></tool_call>',
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done"))
+
+            await useCase.execute(session, "Show file")
+
+            expect(onToolCall).toHaveBeenCalled()
+        })
+    })
+
+    describe("confirmation handling", () => {
+        const mockEditTool: ITool = {
+            name: "edit_lines",
+            description: "Edit lines",
+            parameters: [],
+            requiresConfirmation: true,
+            category: "edit",
+            validateParams: vi.fn().mockReturnValue(null),
+            execute: vi
+                .fn()
+                .mockImplementation(async (_params: Record<string, unknown>, ctx: ToolContext) => {
+                    const confirmed = await ctx.requestConfirmation("Apply edit?", {
+                        filePath: "test.ts",
+                        oldLines: ["old"],
+                        newLines: ["new"],
+                        startLine: 1,
+                    })
+                    if (!confirmed) {
+                        return createSuccessResult("test", { cancelled: true }, 10)
+                    }
+                    return createSuccessResult("test", { applied: true }, 10)
+                }),
+        }
+
+        beforeEach(() => {
+            vi.mocked(mockTools.get).mockReturnValue(mockEditTool)
+        })
+
+        it("should auto-apply when autoApply option is true", async () => {
+            useCase.setOptions({ autoApply: true })
+
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="edit_lines"><path>test.ts</path></tool_call>',
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done"))
+
+            await useCase.execute(session, "Edit file")
+
+            expect(mockEditTool.execute).toHaveBeenCalled()
+        })
+
+        it("should ask for confirmation via callback", async () => {
+            const onConfirmation = vi.fn().mockResolvedValue(true)
+            useCase.setEvents({ onConfirmation })
+
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="edit_lines"><path>test.ts</path></tool_call>',
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done"))
+
+            await useCase.execute(session, "Edit file")
+
+            expect(onConfirmation).toHaveBeenCalled()
+        })
+
+        it("should create undo entry on confirmation", async () => {
+            const onUndoEntry = vi.fn()
+            useCase.setEvents({
+                onConfirmation: vi.fn().mockResolvedValue(true),
+                onUndoEntry,
+            })
+
+            vi.mocked(mockLLM.chat)
+                .mockResolvedValueOnce(
+                    createMockLLMResponse(
+                        '<tool_call name="edit_lines"><path>test.ts</path></tool_call>',
+                    ),
+                )
+                .mockResolvedValueOnce(createMockLLMResponse("Done"))
+
+            await useCase.execute(session, "Edit file")
+
+            expect(onUndoEntry).toHaveBeenCalled()
+            expect(mockSessionStorage.pushUndoEntry).toHaveBeenCalled()
+        })
+    })
+
+    describe("abort", () => {
+        it("should stop processing when aborted", async () => {
+            vi.mocked(mockLLM.chat).mockImplementation(async () => {
+                await new Promise((resolve) => setTimeout(resolve, 100))
+                return createMockLLMResponse("Response")
+            })
+
+            const promise = useCase.execute(session, "Hello")
+
+            setTimeout(() => useCase.abort(), 10)
+
+            await promise
+
+            expect(mockLLM.abort).toHaveBeenCalled()
+        })
+    })
+
+    describe("error handling", () => {
+        it("should handle LLM errors gracefully", async () => {
+            vi.mocked(mockLLM.chat).mockRejectedValue(new Error("LLM unavailable"))
+
+            await useCase.execute(session, "Hello")
+
+            const systemMessages = session.history.filter((m) => m.role === "system")
+            expect(systemMessages.some((m) => m.content.includes("Error"))).toBe(true)
+        })
+
+        it("should emit error status on LLM failure", async () => {
+            const onStatusChange = vi.fn()
+            useCase.setEvents({ onStatusChange })
+
+            vi.mocked(mockLLM.chat).mockRejectedValue(new Error("LLM error"))
+
+            await useCase.execute(session, "Hello")
+
+            expect(onStatusChange).toHaveBeenCalledWith("error")
+        })
+
+        it("should allow retry on error", async () => {
+            const onError = vi.fn().mockResolvedValue("retry")
+            useCase.setEvents({ onError })
+
+            vi.mocked(mockLLM.chat)
+                .mockRejectedValueOnce(new Error("Temporary error"))
+                .mockResolvedValueOnce(createMockLLMResponse("Success!"))
+
+            await useCase.execute(session, "Hello")
+
+            expect(onError).toHaveBeenCalled()
+        })
+    })
+})

packages/ipuaro/tests/unit/application/use-cases/StartSession.test.ts

@@ -0,0 +1,112 @@
+import { describe, it, expect, vi, beforeEach } from "vitest"
+import { StartSession } from "../../../../src/application/use-cases/StartSession.js"
+import type { ISessionStorage } from "../../../../src/domain/services/ISessionStorage.js"
+import { Session } from "../../../../src/domain/entities/Session.js"
+
+describe("StartSession", () => {
+    let useCase: StartSession
+    let mockSessionStorage: ISessionStorage
+
+    beforeEach(() => {
+        mockSessionStorage = {
+            saveSession: vi.fn().mockResolvedValue(undefined),
+            loadSession: vi.fn().mockResolvedValue(null),
+            deleteSession: vi.fn().mockResolvedValue(undefined),
+            listSessions: vi.fn().mockResolvedValue([]),
+            getLatestSession: vi.fn().mockResolvedValue(null),
+            sessionExists: vi.fn().mockResolvedValue(false),
+            pushUndoEntry: vi.fn().mockResolvedValue(undefined),
+            popUndoEntry: vi.fn().mockResolvedValue(null),
+            getUndoStack: vi.fn().mockResolvedValue([]),
+            touchSession: vi.fn().mockResolvedValue(undefined),
+            clearAllSessions: vi.fn().mockResolvedValue(undefined),
+        }
+
+        useCase = new StartSession(mockSessionStorage)
+    })
+
+    describe("execute", () => {
+        it("should create new session when no existing session", async () => {
+            const result = await useCase.execute("test-project")
+
+            expect(result.isNew).toBe(true)
+            expect(result.session.projectName).toBe("test-project")
+            expect(mockSessionStorage.saveSession).toHaveBeenCalled()
+        })
+
+        it("should return latest session when one exists", async () => {
+            const existingSession = new Session("existing-id", "test-project")
+            vi.mocked(mockSessionStorage.getLatestSession).mockResolvedValue(existingSession)
+
+            const result = await useCase.execute("test-project")
+
+            expect(result.isNew).toBe(false)
+            expect(result.session.id).toBe("existing-id")
+            expect(mockSessionStorage.touchSession).toHaveBeenCalledWith("existing-id")
+        })
+
+        it("should load specific session by ID", async () => {
+            const specificSession = new Session("specific-id", "test-project")
+            vi.mocked(mockSessionStorage.loadSession).mockResolvedValue(specificSession)
+
+            const result = await useCase.execute("test-project", { sessionId: "specific-id" })
+
+            expect(result.isNew).toBe(false)
+            expect(result.session.id).toBe("specific-id")
+            expect(mockSessionStorage.loadSession).toHaveBeenCalledWith("specific-id")
+        })
+
+        it("should create new session when specified session not found", async () => {
+            vi.mocked(mockSessionStorage.loadSession).mockResolvedValue(null)
+
+            const result = await useCase.execute("test-project", { sessionId: "non-existent" })
+
+            expect(result.isNew).toBe(true)
+            expect(mockSessionStorage.saveSession).toHaveBeenCalled()
+        })
+
+        it("should force new session when forceNew is true", async () => {
+            const existingSession = new Session("existing-id", "test-project")
+            vi.mocked(mockSessionStorage.getLatestSession).mockResolvedValue(existingSession)
+
+            const result = await useCase.execute("test-project", { forceNew: true })
+
+            expect(result.isNew).toBe(true)
+            expect(result.session.id).not.toBe("existing-id")
+            expect(mockSessionStorage.saveSession).toHaveBeenCalled()
+        })
+
+        it("should generate unique session IDs", async () => {
+            const result1 = await useCase.execute("test-project", { forceNew: true })
+            const result2 = await useCase.execute("test-project", { forceNew: true })
+
+            expect(result1.session.id).not.toBe(result2.session.id)
+        })
+
+        it("should set correct project name on new session", async () => {
+            const result = await useCase.execute("my-special-project")
+
+            expect(result.session.projectName).toBe("my-special-project")
+        })
+
+        it("should initialize new session with empty history", async () => {
+            const result = await useCase.execute("test-project")
+
+            expect(result.session.history).toEqual([])
+        })
+
+        it("should initialize new session with empty undo stack", async () => {
+            const result = await useCase.execute("test-project")
+
+            expect(result.session.undoStack).toEqual([])
+        })
+
+        it("should initialize new session with zero stats", async () => {
+            const result = await useCase.execute("test-project")
+
+            expect(result.session.stats.totalTokens).toBe(0)
+            expect(result.session.stats.toolCalls).toBe(0)
+            expect(result.session.stats.editsApplied).toBe(0)
+        })
+    })
+})

packages/ipuaro/tests/unit/application/use-cases/UndoChange.test.ts

@@ -0,0 +1,234 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest"
+import { promises as fs } from "node:fs"
+import { UndoChange } from "../../../../src/application/use-cases/UndoChange.js"
+import type { ISessionStorage } from "../../../../src/domain/services/ISessionStorage.js"
+import type { IStorage } from "../../../../src/domain/services/IStorage.js"
+import { Session } from "../../../../src/domain/entities/Session.js"
+import type { UndoEntry } from "../../../../src/domain/value-objects/UndoEntry.js"
+
+vi.mock("node:fs", () => ({
+    promises: {
+        readFile: vi.fn(),
+        writeFile: vi.fn(),
+        stat: vi.fn(),
+    },
+}))
+
+describe("UndoChange", () => {
+    let useCase: UndoChange
+    let mockSessionStorage: ISessionStorage
+    let mockStorage: IStorage
+    let session: Session
+
+    const createUndoEntry = (overrides: Partial<UndoEntry> = {}): UndoEntry => ({
+        id: "undo-1",
+        timestamp: Date.now(),
+        filePath: "/project/test.ts",
+        previousContent: ["const a = 1"],
+        newContent: ["const a = 2"],
+        description: "Edit test.ts",
+        ...overrides,
+    })
+
+    beforeEach(() => {
+        mockSessionStorage = {
+            saveSession: vi.fn().mockResolvedValue(undefined),
+            loadSession: vi.fn().mockResolvedValue(null),
+            deleteSession: vi.fn().mockResolvedValue(undefined),
+            listSessions: vi.fn().mockResolvedValue([]),
+            getLatestSession: vi.fn().mockResolvedValue(null),
+            sessionExists: vi.fn().mockResolvedValue(false),
+            pushUndoEntry: vi.fn().mockResolvedValue(undefined),
+            popUndoEntry: vi.fn().mockResolvedValue(null),
+            getUndoStack: vi.fn().mockResolvedValue([]),
+            touchSession: vi.fn().mockResolvedValue(undefined),
+            clearAllSessions: vi.fn().mockResolvedValue(undefined),
+        }
+
+        mockStorage = {
+            getFile: vi.fn().mockResolvedValue(null),
+            setFile: vi.fn().mockResolvedValue(undefined),
+            deleteFile: vi.fn().mockResolvedValue(undefined),
+            getAllFiles: vi.fn().mockResolvedValue(new Map()),
+            getFileCount: vi.fn().mockResolvedValue(0),
+            getAST: vi.fn().mockResolvedValue(null),
+            setAST: vi.fn().mockResolvedValue(undefined),
+            deleteAST: vi.fn().mockResolvedValue(undefined),
+            getAllASTs: vi.fn().mockResolvedValue(new Map()),
+            getMeta: vi.fn().mockResolvedValue(null),
+            setMeta: vi.fn().mockResolvedValue(undefined),
+            deleteMeta: vi.fn().mockResolvedValue(undefined),
+            getAllMetas: vi.fn().mockResolvedValue(new Map()),
+            getSymbolIndex: vi.fn().mockResolvedValue(new Map()),
+            setSymbolIndex: vi.fn().mockResolvedValue(undefined),
+            getDepsGraph: vi.fn().mockResolvedValue({ imports: new Map(), importedBy: new Map() }),
+            setDepsGraph: vi.fn().mockResolvedValue(undefined),
+            getProjectConfig: vi.fn().mockResolvedValue(null),
+            setProjectConfig: vi.fn().mockResolvedValue(undefined),
+            connect: vi.fn().mockResolvedValue(undefined),
+            disconnect: vi.fn().mockResolvedValue(undefined),
+            isConnected: vi.fn().mockReturnValue(true),
+            clear: vi.fn().mockResolvedValue(undefined),
+        }
+
+        session = new Session("test-session", "test-project")
+        session.stats.editsApplied = 1
+
+        useCase = new UndoChange(mockSessionStorage, mockStorage)
+
+        vi.mocked(fs.stat).mockResolvedValue({
+            size: 100,
+            mtimeMs: Date.now(),
+        } as unknown as Awaited<ReturnType<typeof fs.stat>>)
+    })
+
+    afterEach(() => {
+        vi.clearAllMocks()
+    })
+
+    describe("execute", () => {
+        it("should return error when no undo entries", async () => {
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(null)
+
+            const result = await useCase.execute(session)
+
+            expect(result.success).toBe(false)
+            expect(result.error).toBe("No changes to undo")
+        })
+
+        it("should restore previous content when file matches", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("const a = 2")
+            vi.mocked(fs.writeFile).mockResolvedValue(undefined)
+
+            session.addUndoEntry(entry)
+
+            const result = await useCase.execute(session)
+
+            expect(result.success).toBe(true)
+            expect(result.entry).toBe(entry)
+            expect(fs.writeFile).toHaveBeenCalledWith(entry.filePath, "const a = 1", "utf-8")
+        })
+
+        it("should update storage after undo", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("const a = 2")
+            vi.mocked(fs.writeFile).mockResolvedValue(undefined)
+
+            session.addUndoEntry(entry)
+
+            await useCase.execute(session)
+
+            expect(mockStorage.setFile).toHaveBeenCalledWith(
+                entry.filePath,
+                expect.objectContaining({
+                    lines: entry.previousContent,
+                }),
+            )
+        })
+
+        it("should decrement editsApplied counter", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("const a = 2")
+            vi.mocked(fs.writeFile).mockResolvedValue(undefined)
+
+            session.addUndoEntry(entry)
+            const initialEdits = session.stats.editsApplied
+
+            await useCase.execute(session)
+
+            expect(session.stats.editsApplied).toBe(initialEdits - 1)
+        })
+
+        it("should fail when file has been modified externally", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("const a = 999")
+
+            const result = await useCase.execute(session)
+
+            expect(result.success).toBe(false)
+            expect(result.error).toContain("modified since the change")
+        })
+
+        it("should re-push undo entry on conflict", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("const a = 999")
+
+            await useCase.execute(session)
+
+            expect(mockSessionStorage.pushUndoEntry).toHaveBeenCalledWith(session.id, entry)
+        })
+
+        it("should handle empty file for undo", async () => {
+            const entry = createUndoEntry({
+                previousContent: [],
+                newContent: ["new content"],
+            })
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            vi.mocked(fs.readFile).mockResolvedValue("new content")
+            vi.mocked(fs.writeFile).mockResolvedValue(undefined)
+
+            session.addUndoEntry(entry)
+
+            const result = await useCase.execute(session)
+
+            expect(result.success).toBe(true)
+            expect(fs.writeFile).toHaveBeenCalledWith(entry.filePath, "", "utf-8")
+        })
+
+        it("should handle file not found during undo", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.popUndoEntry).mockResolvedValue(entry)
+            const error = new Error("ENOENT") as NodeJS.ErrnoException
+            error.code = "ENOENT"
+            vi.mocked(fs.readFile).mockRejectedValue(error)
+
+            const result = await useCase.execute(session)
+
+            expect(result.success).toBe(false)
+        })
+    })
+
+    describe("canUndo", () => {
+        it("should return false when stack is empty", async () => {
+            vi.mocked(mockSessionStorage.getUndoStack).mockResolvedValue([])
+
+            const result = await useCase.canUndo(session)
+
+            expect(result).toBe(false)
+        })
+
+        it("should return true when stack has entries", async () => {
+            vi.mocked(mockSessionStorage.getUndoStack).mockResolvedValue([createUndoEntry()])
+
+            const result = await useCase.canUndo(session)
+
+            expect(result).toBe(true)
+        })
+    })
+
+    describe("peekUndoEntry", () => {
+        it("should return null when stack is empty", async () => {
+            vi.mocked(mockSessionStorage.getUndoStack).mockResolvedValue([])
+
+            const result = await useCase.peekUndoEntry(session)
+
+            expect(result).toBeNull()
+        })
+
+        it("should return last entry without removing", async () => {
+            const entry = createUndoEntry()
+            vi.mocked(mockSessionStorage.getUndoStack).mockResolvedValue([entry])
+
+            const result = await useCase.peekUndoEntry(session)
+
+            expect(result).toBe(entry)
+            expect(mockSessionStorage.popUndoEntry).not.toHaveBeenCalled()
+        })
+    })
+})

packages/ipuaro/tests/unit/infrastructure/storage/RedisSessionStorage.test.ts

@@ -0,0 +1,390 @@
+import { describe, it, expect, vi, beforeEach } from "vitest"
+import { RedisSessionStorage } from "../../../../src/infrastructure/storage/RedisSessionStorage.js"
+import { RedisClient } from "../../../../src/infrastructure/storage/RedisClient.js"
+import { Session } from "../../../../src/domain/entities/Session.js"
+import type { UndoEntry } from "../../../../src/domain/value-objects/UndoEntry.js"
+import { SessionKeys, SessionFields } from "../../../../src/infrastructure/storage/schema.js"
+
+describe("RedisSessionStorage", () => {
+    let storage: RedisSessionStorage
+    let mockRedis: {
+        hset: ReturnType<typeof vi.fn>
+        hget: ReturnType<typeof vi.fn>
+        hgetall: ReturnType<typeof vi.fn>
+        del: ReturnType<typeof vi.fn>
+        lrange: ReturnType<typeof vi.fn>
+        lpush: ReturnType<typeof vi.fn>
+        lpos: ReturnType<typeof vi.fn>
+        lrem: ReturnType<typeof vi.fn>
+        rpush: ReturnType<typeof vi.fn>
+        rpop: ReturnType<typeof vi.fn>
+        llen: ReturnType<typeof vi.fn>
+        lpop: ReturnType<typeof vi.fn>
+        exists: ReturnType<typeof vi.fn>
+        pipeline: ReturnType<typeof vi.fn>
+    }
+    let mockClient: RedisClient
+
+    beforeEach(() => {
+        mockRedis = {
+            hset: vi.fn().mockResolvedValue(1),
+            hget: vi.fn().mockResolvedValue(null),
+            hgetall: vi.fn().mockResolvedValue({}),
+            del: vi.fn().mockResolvedValue(1),
+            lrange: vi.fn().mockResolvedValue([]),
+            lpush: vi.fn().mockResolvedValue(1),
+            lpos: vi.fn().mockResolvedValue(null),
+            lrem: vi.fn().mockResolvedValue(1),
+            rpush: vi.fn().mockResolvedValue(1),
+            rpop: vi.fn().mockResolvedValue(null),
+            llen: vi.fn().mockResolvedValue(0),
+            lpop: vi.fn().mockResolvedValue(null),
+            exists: vi.fn().mockResolvedValue(0),
+            pipeline: vi.fn().mockReturnValue({
+                hset: vi.fn().mockReturnThis(),
+                del: vi.fn().mockReturnThis(),
+                exec: vi.fn().mockResolvedValue([]),
+            }),
+        }
+
+        mockClient = {
+            getClient: () => mockRedis,
+            connect: vi.fn(),
+            disconnect: vi.fn(),
+            isConnected: vi.fn().mockReturnValue(true),
+        } as unknown as RedisClient
+
+        storage = new RedisSessionStorage(mockClient)
+    })
+
+    describe("saveSession", () => {
+        it("should save session data to Redis", async () => {
+            const session = new Session("test-session-1", "test-project")
+            session.history = [{ role: "user", content: "Hello", timestamp: Date.now() }]
+
+            await storage.saveSession(session)
+
+            const pipeline = mockRedis.pipeline()
+            expect(pipeline.hset).toHaveBeenCalled()
+            expect(pipeline.exec).toHaveBeenCalled()
+        })
+
+        it("should add session to list if not exists", async () => {
+            const session = new Session("test-session-2", "test-project")
+
+            await storage.saveSession(session)
+
+            expect(mockRedis.lpos).toHaveBeenCalledWith(SessionKeys.list, "test-session-2")
+            expect(mockRedis.lpush).toHaveBeenCalledWith(SessionKeys.list, "test-session-2")
+        })
+
+        it("should not add session to list if already exists", async () => {
+            const session = new Session("existing-session", "test-project")
+            mockRedis.lpos.mockResolvedValue(0)
+
+            await storage.saveSession(session)
+
+            expect(mockRedis.lpush).not.toHaveBeenCalled()
+        })
+    })
+
+    describe("loadSession", () => {
+        it("should return null for non-existent session", async () => {
+            mockRedis.hgetall.mockResolvedValue({})
+
+            const result = await storage.loadSession("non-existent")
+
+            expect(result).toBeNull()
+        })
+
+        it("should load session from Redis", async () => {
+            const sessionData = {
+                [SessionFields.projectName]: "test-project",
+                [SessionFields.createdAt]: "1700000000000",
+                [SessionFields.lastActivityAt]: "1700001000000",
+                [SessionFields.history]: "[]",
+                [SessionFields.context]: JSON.stringify({
+                    filesInContext: [],
+                    tokenUsage: 0,
+                    needsCompression: false,
+                }),
+                [SessionFields.stats]: JSON.stringify({
+                    totalTokens: 0,
+                    totalTimeMs: 0,
+                    toolCalls: 0,
+                    editsApplied: 0,
+                    editsRejected: 0,
+                }),
+                [SessionFields.inputHistory]: "[]",
+            }
+            mockRedis.hgetall.mockResolvedValue(sessionData)
+            mockRedis.lrange.mockResolvedValue([])
+
+            const result = await storage.loadSession("test-session")
+
+            expect(result).not.toBeNull()
+            expect(result?.id).toBe("test-session")
+            expect(result?.projectName).toBe("test-project")
+            expect(result?.createdAt).toBe(1700000000000)
+        })
+
+        it("should load undo stack with session", async () => {
+            const sessionData = {
+                [SessionFields.projectName]: "test-project",
+                [SessionFields.createdAt]: "1700000000000",
+                [SessionFields.lastActivityAt]: "1700001000000",
+                [SessionFields.history]: "[]",
+                [SessionFields.context]: "{}",
+                [SessionFields.stats]: "{}",
+                [SessionFields.inputHistory]: "[]",
+            }
+            const undoEntry: UndoEntry = {
+                id: "undo-1",
+                timestamp: Date.now(),
+                filePath: "test.ts",
+                previousContent: ["old"],
+                newContent: ["new"],
+                description: "Edit",
+            }
+            mockRedis.hgetall.mockResolvedValue(sessionData)
+            mockRedis.lrange.mockResolvedValue([JSON.stringify(undoEntry)])
+
+            const result = await storage.loadSession("test-session")
+
+            expect(result?.undoStack).toHaveLength(1)
+            expect(result?.undoStack[0].id).toBe("undo-1")
+        })
+    })
+
+    describe("deleteSession", () => {
+        it("should delete session data and undo stack", async () => {
+            await storage.deleteSession("test-session")
+
+            expect(mockRedis.del).toHaveBeenCalledWith(SessionKeys.data("test-session"))
+            expect(mockRedis.del).toHaveBeenCalledWith(SessionKeys.undo("test-session"))
+            expect(mockRedis.lrem).toHaveBeenCalledWith(SessionKeys.list, 0, "test-session")
+        })
+    })
+
+    describe("listSessions", () => {
+        it("should return empty array when no sessions", async () => {
+            mockRedis.lrange.mockResolvedValue([])
+
+            const result = await storage.listSessions()
+
+            expect(result).toEqual([])
+        })
+
+        it("should list all sessions", async () => {
+            mockRedis.lrange.mockResolvedValue(["session-1", "session-2"])
+            mockRedis.hgetall.mockImplementation((key: string) => {
+                if (key.includes("session-1")) {
+                    return Promise.resolve({
+                        [SessionFields.projectName]: "project-1",
+                        [SessionFields.createdAt]: "1700000000000",
+                        [SessionFields.lastActivityAt]: "1700001000000",
+                        [SessionFields.history]: "[]",
+                    })
+                }
+                if (key.includes("session-2")) {
+                    return Promise.resolve({
+                        [SessionFields.projectName]: "project-2",
+                        [SessionFields.createdAt]: "1700002000000",
+                        [SessionFields.lastActivityAt]: "1700003000000",
+                        [SessionFields.history]: '[{"role":"user","content":"Hi"}]',
+                    })
+                }
+                return Promise.resolve({})
+            })
+
+            const result = await storage.listSessions()
+
+            expect(result).toHaveLength(2)
+            expect(result[0].id).toBe("session-2")
+            expect(result[1].id).toBe("session-1")
+        })
+
+        it("should filter by project name", async () => {
+            mockRedis.lrange.mockResolvedValue(["session-1", "session-2"])
+            mockRedis.hgetall.mockImplementation((key: string) => {
+                if (key.includes("session-1")) {
+                    return Promise.resolve({
+                        [SessionFields.projectName]: "project-1",
+                        [SessionFields.createdAt]: "1700000000000",
+                        [SessionFields.lastActivityAt]: "1700001000000",
+                        [SessionFields.history]: "[]",
+                    })
+                }
+                if (key.includes("session-2")) {
+                    return Promise.resolve({
+                        [SessionFields.projectName]: "project-2",
+                        [SessionFields.createdAt]: "1700002000000",
+                        [SessionFields.lastActivityAt]: "1700003000000",
+                        [SessionFields.history]: "[]",
+                    })
+                }
+                return Promise.resolve({})
+            })
+
+            const result = await storage.listSessions("project-1")
+
+            expect(result).toHaveLength(1)
+            expect(result[0].projectName).toBe("project-1")
+        })
+    })
+
+    describe("getLatestSession", () => {
+        it("should return null when no sessions", async () => {
+            mockRedis.lrange.mockResolvedValue([])
+
+            const result = await storage.getLatestSession("test-project")
+
+            expect(result).toBeNull()
+        })
+
+        it("should return the most recent session", async () => {
+            mockRedis.lrange.mockImplementation((key: string) => {
+                if (key === SessionKeys.list) {
+                    return Promise.resolve(["session-1"])
+                }
+                return Promise.resolve([])
+            })
+            mockRedis.hgetall.mockResolvedValue({
+                [SessionFields.projectName]: "test-project",
+                [SessionFields.createdAt]: "1700000000000",
+                [SessionFields.lastActivityAt]: "1700001000000",
+                [SessionFields.history]: "[]",
+                [SessionFields.context]: "{}",
+                [SessionFields.stats]: "{}",
+                [SessionFields.inputHistory]: "[]",
+            })
+
+            const result = await storage.getLatestSession("test-project")
+
+            expect(result).not.toBeNull()
+            expect(result?.id).toBe("session-1")
+        })
+    })
+
+    describe("sessionExists", () => {
+        it("should return false for non-existent session", async () => {
+            mockRedis.exists.mockResolvedValue(0)
+
+            const result = await storage.sessionExists("non-existent")
+
+            expect(result).toBe(false)
+        })
+
+        it("should return true for existing session", async () => {
+            mockRedis.exists.mockResolvedValue(1)
+
+            const result = await storage.sessionExists("existing")
+
+            expect(result).toBe(true)
+        })
+    })
+
+    describe("undo stack operations", () => {
+        const undoEntry: UndoEntry = {
+            id: "undo-1",
+            timestamp: Date.now(),
+            filePath: "test.ts",
+            previousContent: ["old"],
+            newContent: ["new"],
+            description: "Edit",
+        }
+
+        describe("pushUndoEntry", () => {
+            it("should push undo entry to stack", async () => {
+                mockRedis.llen.mockResolvedValue(1)
+
+                await storage.pushUndoEntry("session-1", undoEntry)
+
+                expect(mockRedis.rpush).toHaveBeenCalledWith(
+                    SessionKeys.undo("session-1"),
+                    JSON.stringify(undoEntry),
+                )
+            })
+
+            it("should remove oldest entry when stack exceeds limit", async () => {
+                mockRedis.llen.mockResolvedValue(11)
+
+                await storage.pushUndoEntry("session-1", undoEntry)
+
+                expect(mockRedis.lpop).toHaveBeenCalledWith(SessionKeys.undo("session-1"))
+            })
+        })
+
+        describe("popUndoEntry", () => {
+            it("should return null for empty stack", async () => {
+                mockRedis.rpop.mockResolvedValue(null)
+
+                const result = await storage.popUndoEntry("session-1")
+
+                expect(result).toBeNull()
+            })
+
+            it("should pop and return undo entry", async () => {
+                mockRedis.rpop.mockResolvedValue(JSON.stringify(undoEntry))
+
+                const result = await storage.popUndoEntry("session-1")
+
+                expect(result).not.toBeNull()
+                expect(result?.id).toBe("undo-1")
+            })
+        })
+
+        describe("getUndoStack", () => {
+            it("should return empty array for empty stack", async () => {
+                mockRedis.lrange.mockResolvedValue([])
+
+                const result = await storage.getUndoStack("session-1")
+
+                expect(result).toEqual([])
+            })
+
+            it("should return all undo entries", async () => {
+                mockRedis.lrange.mockResolvedValue([
+                    JSON.stringify({ ...undoEntry, id: "undo-1" }),
+                    JSON.stringify({ ...undoEntry, id: "undo-2" }),
+                ])
+
+                const result = await storage.getUndoStack("session-1")
+
+                expect(result).toHaveLength(2)
+                expect(result[0].id).toBe("undo-1")
+                expect(result[1].id).toBe("undo-2")
+            })
+        })
+    })
+
+    describe("touchSession", () => {
+        it("should update last activity timestamp", async () => {
+            const beforeTouch = Date.now()
+
+            await storage.touchSession("session-1")
+
+            expect(mockRedis.hset).toHaveBeenCalledWith(
+                SessionKeys.data("session-1"),
+                SessionFields.lastActivityAt,
+                expect.any(String),
+            )
+
+            const callArgs = mockRedis.hset.mock.calls[0]
+            const timestamp = Number(callArgs[2])
+            expect(timestamp).toBeGreaterThanOrEqual(beforeTouch)
+        })
+    })
+
+    describe("clearAllSessions", () => {
+        it("should clear all session data", async () => {
+            mockRedis.lrange.mockResolvedValue(["session-1", "session-2"])
+
+            await storage.clearAllSessions()
+
+            const pipeline = mockRedis.pipeline()
+            expect(pipeline.del).toHaveBeenCalled()
+            expect(pipeline.exec).toHaveBeenCalled()
+        })
+    })
+})

packages/ipuaro/tests/unit/infrastructure/tools/git/GitCommitTool.test.ts

@@ -35,10 +35,7 @@ function createMockStorage(): IStorage {
     } as unknown as IStorage
 }
 
-function createMockContext(
-    storage?: IStorage,
-    confirmResult: boolean = true,
-): ToolContext {
+function createMockContext(storage?: IStorage, confirmResult: boolean = true): ToolContext {
     return {
         projectRoot: "/test/project",
         storage: storage ?? createMockStorage(),
@@ -47,9 +44,7 @@ function createMockContext(
     }
 }
 
-function createMockStatusResult(
-    overrides: Partial<StatusResult> = {},
-): StatusResult {
+function createMockStatusResult(overrides: Partial<StatusResult> = {}): StatusResult {
     return {
         not_added: [],
         conflicted: [],
@@ -70,9 +65,7 @@ function createMockStatusResult(
     } as StatusResult
 }
 
-function createMockCommitResult(
-    overrides: Partial<CommitResult> = {},
-): CommitResult {
+function createMockCommitResult(overrides: Partial<CommitResult> = {}): CommitResult {
     return {
         commit: "abc1234",
         branch: "main",
@@ -96,9 +89,7 @@ function createMockGit(options: {
 }): SimpleGit {
     const mockGit = {
         checkIsRepo: vi.fn().mockResolvedValue(options.isRepo ?? true),
-        status: vi.fn().mockResolvedValue(
-            options.status ?? createMockStatusResult(),
-        ),
+        status: vi.fn().mockResolvedValue(options.status ?? createMockStatusResult()),
         add: vi.fn(),
         commit: vi.fn(),
     }
@@ -112,9 +103,7 @@ function createMockGit(options: {
     if (options.error) {
         mockGit.commit.mockRejectedValue(options.error)
     } else {
-        mockGit.commit.mockResolvedValue(
-            options.commitResult ?? createMockCommitResult(),
-        )
+        mockGit.commit.mockResolvedValue(options.commitResult ?? createMockCommitResult())
     }
 
     return mockGit as unknown as SimpleGit
@@ -175,21 +164,15 @@ describe("GitCommitTool", () => {
         })
 
         it("should return null for valid message with files", () => {
-            expect(
-                tool.validateParams({ message: "fix: bug", files: ["a.ts", "b.ts"] }),
-            ).toBeNull()
+            expect(tool.validateParams({ message: "fix: bug", files: ["a.ts", "b.ts"] })).toBeNull()
         })
 
         it("should return error for non-array files", () => {
-            expect(
-                tool.validateParams({ message: "fix: bug", files: "a.ts" }),
-            ).toContain("array")
+            expect(tool.validateParams({ message: "fix: bug", files: "a.ts" })).toContain("array")
         })
 
         it("should return error for non-string in files array", () => {
-            expect(
-                tool.validateParams({ message: "fix: bug", files: [1, 2] }),
-            ).toContain("strings")
+            expect(tool.validateParams({ message: "fix: bug", files: [1, 2] })).toContain("strings")
         })
     })
 
@@ -200,10 +183,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(false)
                 expect(result.error).toContain("Not a git repository")
@@ -218,10 +198,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(false)
                 expect(result.error).toContain("Nothing to commit")
@@ -241,10 +218,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "feat: new feature" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "feat: new feature" }, ctx)
 
                 expect(result.success).toBe(true)
                 const data = result.data as GitCommitResult
@@ -268,10 +242,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(true)
                 const data = result.data as GitCommitResult
@@ -290,10 +261,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                await toolWithMock.execute(
-                    { message: "test", files: ["a.ts", "b.ts"] },
-                    ctx,
-                )
+                await toolWithMock.execute({ message: "test", files: ["a.ts", "b.ts"] }, ctx)
 
                 expect(mockGit.add).toHaveBeenCalledWith(["a.ts", "b.ts"])
             })
@@ -303,10 +271,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                await toolWithMock.execute(
-                    { message: "test", files: [] },
-                    ctx,
-                )
+                await toolWithMock.execute({ message: "test", files: [] }, ctx)
 
                 expect(mockGit.add).not.toHaveBeenCalled()
             })
@@ -337,8 +302,8 @@ describe("GitCommitTool", () => {
                 await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(ctx.requestConfirmation).toHaveBeenCalled()
-                const confirmMessage = (ctx.requestConfirmation as ReturnType<typeof vi.fn>)
-                    .mock.calls[0][0] as string
+                const confirmMessage = (ctx.requestConfirmation as ReturnType<typeof vi.fn>).mock
+                    .calls[0][0] as string
                 expect(confirmMessage).toContain("Committing")
                 expect(confirmMessage).toContain("test commit")
             })
@@ -348,10 +313,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext(undefined, false)
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(false)
                 expect(result.error).toContain("cancelled")
@@ -363,10 +325,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext(undefined, true)
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(true)
                 expect(mockGit.commit).toHaveBeenCalledWith("test commit")
@@ -381,10 +340,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(false)
                 expect(result.error).toContain("Git commit failed")
@@ -400,10 +356,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.success).toBe(false)
                 expect(result.error).toBe("string error")
@@ -416,10 +369,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.executionTimeMs).toBeGreaterThanOrEqual(0)
             })
@@ -431,10 +381,7 @@ describe("GitCommitTool", () => {
                 const toolWithMock = new GitCommitTool(() => mockGit)
                 const ctx = createMockContext()
 
-                const result = await toolWithMock.execute(
-                    { message: "test commit" },
-                    ctx,
-                )
+                const result = await toolWithMock.execute({ message: "test commit" }, ctx)
 
                 expect(result.callId).toMatch(/^git_commit-\d+$/)
             })

packages/ipuaro/tests/unit/infrastructure/tools/git/GitDiffTool.test.ts

@@ -69,9 +69,7 @@ function createMockGit(options: {
     if (options.error) {
         mockGit.diffSummary.mockRejectedValue(options.error)
     } else {
-        mockGit.diffSummary.mockResolvedValue(
-            options.diffSummary ?? createMockDiffSummary(),
-        )
+        mockGit.diffSummary.mockResolvedValue(options.diffSummary ?? createMockDiffSummary())
         mockGit.diff.mockResolvedValue(options.diff ?? "")
     }
 
@@ -224,9 +222,7 @@ describe("GitDiffTool", () => {
             it("should handle binary files", async () => {
                 const mockGit = createMockGit({
                     diffSummary: createMockDiffSummary({
-                        files: [
-                            { file: "image.png", insertions: 0, deletions: 0, binary: true },
-                        ],
+                        files: [{ file: "image.png", insertions: 0, deletions: 0, binary: true }],
                     }),
                 })
                 const toolWithMock = new GitDiffTool(() => mockGit)
@@ -293,11 +289,7 @@ describe("GitDiffTool", () => {
                 )
 
                 expect(result.success).toBe(true)
-                expect(mockGit.diffSummary).toHaveBeenCalledWith([
-                    "--cached",
-                    "--",
-                    "src/index.ts",
-                ])
+                expect(mockGit.diffSummary).toHaveBeenCalledWith(["--cached", "--", "src/index.ts"])
             })
 
             it("should return null pathFilter when not provided", async () => {

packages/ipuaro/tests/unit/infrastructure/tools/run/CommandSecurity.test.ts

@@ -14,12 +14,8 @@ describe("CommandSecurity", () => {
 
     describe("constructor", () => {
         it("should use default blacklist and whitelist", () => {
-            expect(security.getBlacklist()).toEqual(
-                DEFAULT_BLACKLIST.map((c) => c.toLowerCase()),
-            )
-            expect(security.getWhitelist()).toEqual(
-                DEFAULT_WHITELIST.map((c) => c.toLowerCase()),
-            )
+            expect(security.getBlacklist()).toEqual(DEFAULT_BLACKLIST.map((c) => c.toLowerCase()))
+            expect(security.getWhitelist()).toEqual(DEFAULT_WHITELIST.map((c) => c.toLowerCase()))
         })
 
         it("should accept custom blacklist and whitelist", () => {

packages/ipuaro/tests/unit/infrastructure/tools/run/RunCommandTool.test.ts

@@ -35,10 +35,7 @@ function createMockStorage(): IStorage {
     } as unknown as IStorage
 }
 
-function createMockContext(
-    storage?: IStorage,
-    confirmResult: boolean = true,
-): ToolContext {
+function createMockContext(storage?: IStorage, confirmResult: boolean = true): ToolContext {
     return {
         projectRoot: "/test/project",
         storage: storage ?? createMockStorage(),
@@ -48,10 +45,7 @@ function createMockContext(
 }
 
 type ExecResult = { stdout: string; stderr: string }
-type ExecFn = (
-    command: string,
-    options: Record<string, unknown>,
-) => Promise<ExecResult>
+type ExecFn = (command: string, options: Record<string, unknown>) => Promise<ExecResult>
 
 function createMockExec(options: {
     stdout?: string
@@ -123,27 +117,19 @@ describe("RunCommandTool", () => {
         })
 
         it("should return error for non-number timeout", () => {
-            expect(
-                tool.validateParams({ command: "ls", timeout: "5000" }),
-            ).toContain("number")
+            expect(tool.validateParams({ command: "ls", timeout: "5000" })).toContain("number")
         })
 
         it("should return error for negative timeout", () => {
-            expect(tool.validateParams({ command: "ls", timeout: -1 })).toContain(
-                "positive",
-            )
+            expect(tool.validateParams({ command: "ls", timeout: -1 })).toContain("positive")
         })
 
         it("should return error for zero timeout", () => {
-            expect(tool.validateParams({ command: "ls", timeout: 0 })).toContain(
-                "positive",
-            )
+            expect(tool.validateParams({ command: "ls", timeout: 0 })).toContain("positive")
         })
 
         it("should return error for timeout > 10 minutes", () => {
-            expect(
-                tool.validateParams({ command: "ls", timeout: 600001 }),
-            ).toContain("600000")
+            expect(tool.validateParams({ command: "ls", timeout: 600001 })).toContain("600000")
         })
 
         it("should return null for valid timeout", () => {
@@ -180,10 +166,7 @@ describe("RunCommandTool", () => {
             const toolWithMock = new RunCommandTool(undefined, execFn)
             const ctx = createMockContext()
 
-            const result = await toolWithMock.execute(
-                { command: "git push --force" },
-                ctx,
-            )
+            const result = await toolWithMock.execute({ command: "git push --force" }, ctx)
 
             expect(result.success).toBe(false)
             expect(result.error).toContain("blocked")
@@ -250,10 +233,7 @@ describe("RunCommandTool", () => {
             const toolWithMock = new RunCommandTool(undefined, execFn)
             const ctx = createMockContext(undefined, true)
 
-            const result = await toolWithMock.execute(
-                { command: "custom-script" },
-                ctx,
-            )
+            const result = await toolWithMock.execute({ command: "custom-script" }, ctx)
 
             expect(result.success).toBe(true)
             const data = result.data as RunCommandResult
@@ -266,10 +246,7 @@ describe("RunCommandTool", () => {
             const toolWithMock = new RunCommandTool(undefined, execFn)
             const ctx = createMockContext(undefined, false)
 
-            const result = await toolWithMock.execute(
-                { command: "custom-script" },
-                ctx,
-            )
+            const result = await toolWithMock.execute({ command: "custom-script" }, ctx)
 
             expect(result.success).toBe(false)
             expect(result.error).toContain("cancelled")
@@ -364,10 +341,7 @@ describe("RunCommandTool", () => {
 
             await toolWithMock.execute({ command: "ls" }, ctx)
 
-            expect(execFn).toHaveBeenCalledWith(
-                "ls",
-                expect.objectContaining({ timeout: 30000 }),
-            )
+            expect(execFn).toHaveBeenCalledWith("ls", expect.objectContaining({ timeout: 30000 }))
         })
 
         it("should use custom timeout", async () => {
@@ -377,10 +351,7 @@ describe("RunCommandTool", () => {
 
             await toolWithMock.execute({ command: "ls", timeout: 5000 }, ctx)
 
-            expect(execFn).toHaveBeenCalledWith(
-                "ls",
-                expect.objectContaining({ timeout: 5000 }),
-            )
+            expect(execFn).toHaveBeenCalledWith("ls", expect.objectContaining({ timeout: 5000 }))
         })
 
         it("should execute in project root", async () => {
@@ -493,10 +464,7 @@ describe("RunCommandTool", () => {
 
             toolWithMock.getSecurity().addToWhitelist(["custom-safe"])
 
-            const result = await toolWithMock.execute(
-                { command: "custom-safe arg" },
-                ctx,
-            )
+            const result = await toolWithMock.execute({ command: "custom-safe arg" }, ctx)
 
             expect(result.success).toBe(true)
             expect(ctx.requestConfirmation).not.toHaveBeenCalled()

packages/ipuaro/tests/unit/infrastructure/tools/run/RunTestsTool.test.ts

@@ -45,10 +45,7 @@ function createMockContext(storage?: IStorage): ToolContext {
 }
 
 type ExecResult = { stdout: string; stderr: string }
-type ExecFn = (
-    command: string,
-    options: Record<string, unknown>,
-) => Promise<ExecResult>
+type ExecFn = (command: string, options: Record<string, unknown>) => Promise<ExecResult>
 
 function createMockExec(options: {
     stdout?: string
@@ -127,9 +124,7 @@ describe("RunTestsTool", () => {
         })
 
         it("should return null for valid params", () => {
-            expect(
-                tool.validateParams({ path: "src", filter: "login", watch: true }),
-            ).toBeNull()
+            expect(tool.validateParams({ path: "src", filter: "login", watch: true })).toBeNull()
         })
 
         it("should return error for invalid path", () => {