feat(ipuaro): add impact score to initial context

Add High Impact Files section to initial context showing which files
are most critical based on percentage of codebase that depends on them.

Changes:
- Add impactScore field to FileMeta (0-100)
- Add calculateImpactScore() helper function
- Update MetaAnalyzer to compute impact scores
- Add formatHighImpactFiles() to prompts.ts
- Add includeHighImpactFiles config option (default: true)
- 28 new tests (1826 total)

packages/ipuaro/CHANGELOG.md

@@ -5,6 +5,64 @@ 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).
 
+## [0.29.0] - 2025-12-05 - Impact Score
+
+### Added
+
+- **High Impact Files in Initial Context (v0.29.0)**
+  - New `## High Impact Files` section in initial context
+  - Shows files with highest impact scores (percentage of codebase depending on them)
+  - Table format with File, Impact %, and Dependents count
+  - Files sorted by impact score descending
+  - Default: shows top 10 files with impact score >= 5%
+
+- **Impact Score Computation**
+  - New `impactScore: number` field in `FileMeta` (0-100)
+  - Formula: `(dependents.length / (totalFiles - 1)) * 100`
+  - Computed in `MetaAnalyzer.analyzeAll()` after all files analyzed
+  - New `calculateImpactScore()` helper function in FileMeta.ts
+
+- **Configuration Option**
+  - `includeHighImpactFiles: boolean` in ContextConfigSchema (default: `true`)
+  - `includeHighImpactFiles` option in `BuildContextOptions`
+  - Users can disable to save tokens: `context.includeHighImpactFiles: false`
+
+- **New Helper Function in prompts.ts**
+  - `formatHighImpactFiles()` - formats high impact files table for display
+
+### New Context Format
+
+```
+## High Impact Files
+
+| File | Impact | Dependents |
+|------|--------|------------|
+| utils/validation | 67% | 12 files |
+| types/user | 45% | 8 files |
+| services/user | 34% | 6 files |
+```
+
+### Technical Details
+
+- Total tests: 1826 passed (was 1798, +28 new tests)
+  - 9 new tests for calculateImpactScore()
+  - 14 new tests for formatHighImpactFiles() and buildInitialContext
+  - 5 new tests for includeHighImpactFiles config option
+- Coverage: 97.52% lines, 91.3% branches, 98.63% functions
+- 0 ESLint errors, 3 warnings (pre-existing complexity)
+- Build successful
+
+### Notes
+
+This completes v0.29.0 of the Graph Metrics milestone:
+- ✅ 0.27.0 - Inline Dependency Graph
+- ✅ 0.28.0 - Circular Dependencies in Context
+- ✅ 0.29.0 - Impact Score
+
+Next milestone: v0.30.0 - Transitive Dependencies Count
+
+---
+
 ## [0.28.0] - 2025-12-05 - Circular Dependencies in Context
 
 ### Added

packages/ipuaro/ROADMAP.md

@@ -1950,10 +1950,10 @@ Enhance initial context for LLM: add function signatures, interface field types,
 
 ---
 
-## Version 0.29.0 - Impact Score 📈
+## Version 0.29.0 - Impact Score 📈 ✅
 
 **Priority:** MEDIUM
-**Status:** Planned
+**Status:** Complete (v0.29.0 released)
 
 ### Description
 
@@ -1972,10 +1972,16 @@ Enhance initial context for LLM: add function signatures, interface field types,
 ```
 
 **Changes:**
-- [ ] Add `impactScore: number` to FileMeta (0-100)
-- [ ] Compute in MetaAnalyzer: (transitiveDepByCount / totalFiles) * 100
-- [ ] Add `formatHighImpactFiles()` to prompts.ts
-- [ ] Show top-10 high impact files
+- [x] Add `impactScore: number` to FileMeta (0-100)
+- [x] Compute in MetaAnalyzer: (dependents.length / (totalFiles - 1)) * 100
+- [x] Add `formatHighImpactFiles()` to prompts.ts
+- [x] Show top-10 high impact files
+- [x] Add `includeHighImpactFiles` config option (default: true)
+
+**Tests:**
+- [x] Unit tests for calculateImpactScore (9 tests)
+- [x] Unit tests for formatHighImpactFiles (14 tests)
+- [x] Unit tests for includeHighImpactFiles config (5 tests)
 
 **Why:** LLM understands which files are critical for changes.
 
@@ -2022,12 +2028,12 @@ interface FileMeta {
 - [x] Error handling complete ✅ (v0.16.0)
 - [ ] Performance optimized
 - [x] Documentation complete ✅ (v0.17.0)
-- [x] Test coverage ≥91% branches, ≥95% lines/functions/statements ✅ (91.13% branches, 97.48% lines, 98.63% functions, 97.48% statements - 1798 tests)
+- [x] Test coverage ≥91% branches, ≥95% lines/functions/statements ✅ (91.3% branches, 97.52% lines, 98.63% functions, 97.52% statements - 1826 tests)
 - [x] 0 ESLint errors ✅
 - [x] Examples working ✅ (v0.18.0)
 - [x] CHANGELOG.md up to date ✅
 - [x] Rich initial context (v0.24.0-v0.26.0) — function signatures, interface fields, enum values, decorators ✅
-- [ ] Graph metrics in context (v0.27.0-v0.30.0) — dependency graph ✅, circular deps ✅, impact score, transitive deps
+- [ ] Graph metrics in context (v0.27.0-v0.30.0) — dependency graph ✅, circular deps ✅, impact score ✅, transitive deps
 
 ---
 
@@ -2106,7 +2112,7 @@ sessions:list             # List<session_id>
 
 **Last Updated:** 2025-12-05
 **Target Version:** 1.0.0
-**Current Version:** 0.28.0
-**Next Milestones:** v0.29.0 (Impact Score), v0.30.0 (Transitive Deps)
+**Current Version:** 0.29.0
+**Next Milestones:** v0.30.0 (Transitive Deps), v1.0.0 (Production Ready)
 
-> **Note:** Rich Initial Context complete ✅ (v0.24.0-v0.26.0). Graph Metrics in progress (v0.27.0 ✅, v0.28.0 ✅, v0.29.0-v0.30.0 pending) for 1.0.0 release.
+> **Note:** Rich Initial Context complete ✅ (v0.24.0-v0.26.0). Graph Metrics in progress (v0.27.0 ✅, v0.28.0 ✅, v0.29.0 ✅, v0.30.0 pending) for 1.0.0 release.

packages/ipuaro/src/domain/value-objects/FileMeta.ts

@@ -26,6 +26,8 @@ export interface FileMeta {
     isEntryPoint: boolean
     /** File type classification */
     fileType: "source" | "test" | "config" | "types" | "unknown"
+    /** Impact score (0-100): percentage of codebase that depends on this file */
+    impactScore: number
 }
 
 export function createFileMeta(partial: Partial<FileMeta> = {}): FileMeta {
@@ -41,6 +43,7 @@ export function createFileMeta(partial: Partial<FileMeta> = {}): FileMeta {
         isHub: false,
         isEntryPoint: false,
         fileType: "unknown",
+        impactScore: 0,
         ...partial,
     }
 }
@@ -48,3 +51,20 @@ export function createFileMeta(partial: Partial<FileMeta> = {}): FileMeta {
 export function isHubFile(dependentCount: number): boolean {
     return dependentCount > 5
 }
+
+/**
+ * Calculate impact score based on number of dependents and total files.
+ * Impact score represents what percentage of the codebase depends on this file.
+ * @param dependentCount - Number of files that depend on this file
+ * @param totalFiles - Total number of files in the project
+ * @returns Impact score from 0 to 100
+ */
+export function calculateImpactScore(dependentCount: number, totalFiles: number): number {
+    if (totalFiles <= 1) {
+        return 0
+    }
+    // Exclude the file itself from the total
+    const maxPossibleDependents = totalFiles - 1
+    const score = (dependentCount / maxPossibleDependents) * 100
+    return Math.round(Math.min(100, score))
+}

packages/ipuaro/src/infrastructure/indexer/MetaAnalyzer.ts

@@ -1,5 +1,6 @@
 import * as path from "node:path"
 import {
+    calculateImpactScore,
     type ComplexityMetrics,
     createFileMeta,
     type FileMeta,
@@ -430,6 +431,7 @@ export class MetaAnalyzer {
 
     /**
      * Batch analyze multiple files.
+     * Computes impact scores after all files are analyzed.
      */
     analyzeAll(files: Map<string, { ast: FileAST; content: string }>): Map<string, FileMeta> {
         const allASTs = new Map<string, FileAST>()
@@ -443,6 +445,12 @@ export class MetaAnalyzer {
             results.set(filePath, meta)
         }
 
+        // Compute impact scores now that we know total file count
+        const totalFiles = results.size
+        for (const [, meta] of results) {
+            meta.impactScore = calculateImpactScore(meta.dependents.length, totalFiles)
+        }
+
         return results
     }
 }

packages/ipuaro/src/infrastructure/llm/prompts.ts

@@ -18,6 +18,7 @@ export interface BuildContextOptions {
     includeSignatures?: boolean
     includeDepsGraph?: boolean
     includeCircularDeps?: boolean
+    includeHighImpactFiles?: boolean
     circularDeps?: string[][]
 }
 
@@ -132,6 +133,7 @@ export function buildInitialContext(
     const includeSignatures = options?.includeSignatures ?? true
     const includeDepsGraph = options?.includeDepsGraph ?? true
     const includeCircularDeps = options?.includeCircularDeps ?? true
+    const includeHighImpactFiles = options?.includeHighImpactFiles ?? true
 
     sections.push(formatProjectHeader(structure))
     sections.push(formatDirectoryTree(structure))
@@ -144,6 +146,13 @@ export function buildInitialContext(
         }
     }
 
+    if (includeHighImpactFiles && metas && metas.size > 0) {
+        const highImpactSection = formatHighImpactFiles(metas)
+        if (highImpactSection) {
+            sections.push(highImpactSection)
+        }
+    }
+
     if (includeCircularDeps && options?.circularDeps && options.circularDeps.length > 0) {
         const circularDepsSection = formatCircularDeps(options.circularDeps)
         if (circularDepsSection) {
@@ -568,6 +577,74 @@ export function formatCircularDeps(cycles: string[][]): string | null {
     return lines.join("\n")
 }
 
+/**
+ * Format high impact files table for display in context.
+ * Shows files with highest impact scores (most dependents).
+ *
+ * Format:
+ * ## High Impact Files
+ * | File | Impact | Dependents |
+ * |------|--------|------------|
+ * | src/utils/validation.ts | 67% | 12 files |
+ *
+ * @param metas - Map of file paths to their metadata
+ * @param limit - Maximum number of files to show (default: 10)
+ * @param minImpact - Minimum impact score to include (default: 5)
+ */
+export function formatHighImpactFiles(
+    metas: Map<string, FileMeta>,
+    limit = 10,
+    minImpact = 5,
+): string | null {
+    if (metas.size === 0) {
+        return null
+    }
+
+    // Collect files with impact score >= minImpact
+    const impactFiles: { path: string; impact: number; dependents: number }[] = []
+
+    for (const [path, meta] of metas) {
+        if (meta.impactScore >= minImpact) {
+            impactFiles.push({
+                path,
+                impact: meta.impactScore,
+                dependents: meta.dependents.length,
+            })
+        }
+    }
+
+    if (impactFiles.length === 0) {
+        return null
+    }
+
+    // Sort by impact score descending, then by path
+    impactFiles.sort((a, b) => {
+        if (a.impact !== b.impact) {
+            return b.impact - a.impact
+        }
+        return a.path.localeCompare(b.path)
+    })
+
+    // Take top N files
+    const topFiles = impactFiles.slice(0, limit)
+
+    const lines: string[] = [
+        "## High Impact Files",
+        "",
+        "| File | Impact | Dependents |",
+        "|------|--------|------------|",
+    ]
+
+    for (const file of topFiles) {
+        const shortPath = shortenPath(file.path)
+        const impact = `${String(file.impact)}%`
+        const dependents = file.dependents === 1 ? "1 file" : `${String(file.dependents)} files`
+        lines.push(`| ${shortPath} | ${impact} | ${dependents} |`)
+    }
+
+    return lines.join("\n")
+}
+
 /**
  * Format line range for display.
  */

packages/ipuaro/src/shared/constants/config.ts

@@ -117,6 +117,7 @@ export const ContextConfigSchema = z.object({
     includeSignatures: z.boolean().default(true),
     includeDepsGraph: z.boolean().default(true),
     includeCircularDeps: z.boolean().default(true),
+    includeHighImpactFiles: z.boolean().default(true),
 })
 
 /**

packages/ipuaro/tests/unit/domain/value-objects/FileMeta.test.ts

@@ -1,5 +1,9 @@
 import { describe, it, expect } from "vitest"
-import { createFileMeta, isHubFile } from "../../../../src/domain/value-objects/FileMeta.js"
+import {
+    calculateImpactScore,
+    createFileMeta,
+    isHubFile,
+} from "../../../../src/domain/value-objects/FileMeta.js"
 
 describe("FileMeta", () => {
     describe("createFileMeta", () => {
@@ -15,6 +19,7 @@ describe("FileMeta", () => {
             expect(meta.isHub).toBe(false)
             expect(meta.isEntryPoint).toBe(false)
             expect(meta.fileType).toBe("unknown")
+            expect(meta.impactScore).toBe(0)
         })
 
         it("should merge partial values", () => {
@@ -42,4 +47,51 @@ describe("FileMeta", () => {
             expect(isHubFile(0)).toBe(false)
         })
     })
+
+    describe("calculateImpactScore", () => {
+        it("should return 0 for file with 0 dependents", () => {
+            expect(calculateImpactScore(0, 10)).toBe(0)
+        })
+
+        it("should return 0 when totalFiles is 0", () => {
+            expect(calculateImpactScore(5, 0)).toBe(0)
+        })
+
+        it("should return 0 when totalFiles is 1", () => {
+            expect(calculateImpactScore(0, 1)).toBe(0)
+        })
+
+        it("should calculate correct percentage", () => {
+            // 5 dependents out of 10 files (excluding itself = 9 possible)
+            // 5/9 * 100 = 55.56 → rounded to 56
+            expect(calculateImpactScore(5, 10)).toBe(56)
+        })
+
+        it("should return 100 when all other files depend on it", () => {
+            // 9 dependents out of 10 files (9 possible dependents)
+            expect(calculateImpactScore(9, 10)).toBe(100)
+        })
+
+        it("should cap at 100", () => {
+            // Edge case: more dependents than possible (shouldn't happen normally)
+            expect(calculateImpactScore(20, 10)).toBe(100)
+        })
+
+        it("should round the percentage", () => {
+            // 1 dependent out of 3 files (2 possible)
+            // 1/2 * 100 = 50
+            expect(calculateImpactScore(1, 3)).toBe(50)
+        })
+
+        it("should calculate impact for small projects", () => {
+            // 1 dependent out of 2 files (1 possible)
+            expect(calculateImpactScore(1, 2)).toBe(100)
+        })
+
+        it("should calculate impact for larger projects", () => {
+            // 50 dependents out of 100 files (99 possible)
+            // 50/99 * 100 = 50.51 → rounded to 51
+            expect(calculateImpactScore(50, 100)).toBe(51)
+        })
+    })
 })

packages/ipuaro/tests/unit/infrastructure/llm/prompts.test.ts

@@ -6,6 +6,7 @@ import {
     truncateContext,
     formatDependencyGraph,
     formatCircularDeps,
+    formatHighImpactFiles,
     type ProjectStructure,
 } from "../../../../src/infrastructure/llm/prompts.js"
 import type { FileAST } from "../../../../src/domain/value-objects/FileAST.js"
@@ -2395,6 +2396,345 @@ describe("prompts", () => {
         })
     })
 
+    describe("high impact files (0.29.0)", () => {
+        describe("formatHighImpactFiles", () => {
+            it("should return null for empty metas", () => {
+                const metas = new Map<string, FileMeta>()
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toBeNull()
+            })
+
+            it("should return null when no files have impact score >= minImpact", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/low.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: [],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 2,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toBeNull()
+            })
+
+            it("should format file with high impact score", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/utils/validation.ts",
+                        {
+                            complexity: { loc: 50, nesting: 2, cyclomaticComplexity: 5, score: 30 },
+                            dependencies: [],
+                            dependents: [
+                                "a.ts",
+                                "b.ts",
+                                "c.ts",
+                                "d.ts",
+                                "e.ts",
+                                "f.ts",
+                                "g.ts",
+                                "h.ts",
+                                "i.ts",
+                                "j.ts",
+                                "k.ts",
+                                "l.ts",
+                            ],
+                            isHub: true,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 67,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toContain("## High Impact Files")
+                expect(result).toContain("| File | Impact | Dependents |")
+                expect(result).toContain("| utils/validation | 67% | 12 files |")
+            })
+
+            it("should sort by impact score descending", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/low.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 10,
+                        },
+                    ],
+                    [
+                        "src/high.ts",
+                        {
+                            complexity: { loc: 20, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts", "c.ts", "d.ts", "e.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 50,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).not.toBeNull()
+                const lines = result!.split("\n")
+                const highIndex = lines.findIndex((l) => l.includes("high"))
+                const lowIndex = lines.findIndex((l) => l.includes("low"))
+                expect(highIndex).toBeLessThan(lowIndex)
+            })
+
+            it("should limit to top N files", () => {
+                const metas = new Map<string, FileMeta>()
+                for (let i = 0; i < 20; i++) {
+                    metas.set(`src/file${String(i)}.ts`, {
+                        complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                        dependencies: [],
+                        dependents: ["a.ts"],
+                        isHub: false,
+                        isEntryPoint: false,
+                        fileType: "source",
+                        impactScore: 10 + i,
+                    })
+                }
+
+                const result = formatHighImpactFiles(metas, 5)
+
+                expect(result).not.toBeNull()
+                const dataLines = result!
+                    .split("\n")
+                    .filter((l) => l.startsWith("| ") && l.includes("%"))
+                expect(dataLines).toHaveLength(5)
+            })
+
+            it("should filter by minImpact", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/high.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts", "c.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 30,
+                        },
+                    ],
+                    [
+                        "src/low.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 5,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas, 10, 20)
+
+                expect(result).not.toBeNull()
+                expect(result).toContain("high")
+                expect(result).not.toContain("low")
+            })
+
+            it("should show singular 'file' for 1 dependent", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/single.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 10,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toContain("1 file")
+                expect(result).not.toContain("1 files")
+            })
+
+            it("should shorten src/ prefix", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/services/user.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 20,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toContain("services/user")
+                expect(result).not.toContain("src/")
+            })
+
+            it("should remove file extensions", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "lib/utils.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts"],
+                            isHub: false,
+                            isEntryPoint: false,
+                            fileType: "source",
+                            impactScore: 20,
+                        },
+                    ],
+                ])
+
+                const result = formatHighImpactFiles(metas)
+
+                expect(result).toContain("lib/utils")
+                expect(result).not.toContain(".ts")
+            })
+        })
+
+        describe("buildInitialContext with includeHighImpactFiles", () => {
+            const structure: ProjectStructure = {
+                name: "test-project",
+                rootPath: "/test",
+                files: ["src/index.ts"],
+                directories: ["src"],
+            }
+
+            const asts = new Map<string, FileAST>([
+                [
+                    "src/index.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [],
+                        classes: [],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            it("should include high impact files by default", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/index.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts"],
+                            isHub: false,
+                            isEntryPoint: true,
+                            fileType: "source",
+                            impactScore: 20,
+                        },
+                    ],
+                ])
+
+                const context = buildInitialContext(structure, asts, metas)
+
+                expect(context).toContain("## High Impact Files")
+            })
+
+            it("should exclude high impact files when includeHighImpactFiles is false", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/index.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: ["a.ts", "b.ts"],
+                            isHub: false,
+                            isEntryPoint: true,
+                            fileType: "source",
+                            impactScore: 20,
+                        },
+                    ],
+                ])
+
+                const context = buildInitialContext(structure, asts, metas, {
+                    includeHighImpactFiles: false,
+                })
+
+                expect(context).not.toContain("## High Impact Files")
+            })
+
+            it("should not include high impact files when metas is undefined", () => {
+                const context = buildInitialContext(structure, asts, undefined, {
+                    includeHighImpactFiles: true,
+                })
+
+                expect(context).not.toContain("## High Impact Files")
+            })
+
+            it("should not include high impact files when metas is empty", () => {
+                const emptyMetas = new Map<string, FileMeta>()
+
+                const context = buildInitialContext(structure, asts, emptyMetas, {
+                    includeHighImpactFiles: true,
+                })
+
+                expect(context).not.toContain("## High Impact Files")
+            })
+
+            it("should not include high impact files when no files have high impact", () => {
+                const metas = new Map<string, FileMeta>([
+                    [
+                        "src/index.ts",
+                        {
+                            complexity: { loc: 10, nesting: 1, cyclomaticComplexity: 1, score: 10 },
+                            dependencies: [],
+                            dependents: [],
+                            isHub: false,
+                            isEntryPoint: true,
+                            fileType: "source",
+                            impactScore: 0,
+                        },
+                    ],
+                ])
+
+                const context = buildInitialContext(structure, asts, metas, {
+                    includeHighImpactFiles: true,
+                })
+
+                expect(context).not.toContain("## High Impact Files")
+            })
+        })
+    })
+
     describe("circular dependencies (0.28.0)", () => {
         describe("formatCircularDeps", () => {
             it("should return null for empty array", () => {

packages/ipuaro/tests/unit/shared/context-config.test.ts

@@ -18,6 +18,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             })
         })
 
@@ -32,6 +33,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             })
         })
     })
@@ -171,6 +173,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             })
         })
 
@@ -187,6 +190,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             })
         })
 
@@ -204,6 +208,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             })
         })
     })
@@ -218,6 +223,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: false,
                 includeDepsGraph: false,
                 includeCircularDeps: false,
+                includeHighImpactFiles: false,
             }
 
             const result = ContextConfigSchema.parse(config)
@@ -233,6 +239,7 @@ describe("ContextConfigSchema", () => {
                 includeSignatures: true,
                 includeDepsGraph: true,
                 includeCircularDeps: true,
+                includeHighImpactFiles: true,
             }
 
             const result = ContextConfigSchema.parse(config)
@@ -314,4 +321,29 @@ describe("ContextConfigSchema", () => {
             expect(() => ContextConfigSchema.parse({ includeCircularDeps: 1 })).toThrow()
         })
     })
+
+    describe("includeHighImpactFiles", () => {
+        it("should accept true", () => {
+            const result = ContextConfigSchema.parse({ includeHighImpactFiles: true })
+            expect(result.includeHighImpactFiles).toBe(true)
+        })
+
+        it("should accept false", () => {
+            const result = ContextConfigSchema.parse({ includeHighImpactFiles: false })
+            expect(result.includeHighImpactFiles).toBe(false)
+        })
+
+        it("should default to true", () => {
+            const result = ContextConfigSchema.parse({})
+            expect(result.includeHighImpactFiles).toBe(true)
+        })
+
+        it("should reject non-boolean", () => {
+            expect(() => ContextConfigSchema.parse({ includeHighImpactFiles: "true" })).toThrow()
+        })
+
+        it("should reject number", () => {
+            expect(() => ContextConfigSchema.parse({ includeHighImpactFiles: 1 })).toThrow()
+        })
+    })
 })