diff --git a/packages/guardian/src/domain/value-objects/RepositoryViolation.ts b/packages/guardian/src/domain/value-objects/RepositoryViolation.ts
index 628f80f..22ff3d4 100644
--- a/packages/guardian/src/domain/value-objects/RepositoryViolation.ts
+++ b/packages/guardian/src/domain/value-objects/RepositoryViolation.ts
@@ -1,6 +1,10 @@
 import { ValueObject } from "./ValueObject"
 import { REPOSITORY_VIOLATION_TYPES } from "../../shared/constants/rules"
-import { REPOSITORY_FALLBACK_SUGGESTIONS, REPOSITORY_PATTERN_MESSAGES } from "../constants/Messages"
+import {
+    REPOSITORY_FALLBACK_SUGGESTIONS,
+    REPOSITORY_PATTERN_MESSAGES,
+    VIOLATION_EXAMPLE_VALUES,
+} from "../constants/Messages"
 
 interface RepositoryViolationProps {
     readonly violationType:
@@ -105,16 +109,16 @@ export class RepositoryViolation extends ValueObject<RepositoryViolationProps> {
     public getMessage(): string {
         switch (this.props.violationType) {
             case REPOSITORY_VIOLATION_TYPES.ORM_TYPE_IN_INTERFACE:
-                return `Repository interface uses ORM-specific type '${this.props.ormType || "unknown"}'. Domain should not depend on infrastructure concerns.`
+                return `Repository interface uses ORM-specific type '${this.props.ormType || VIOLATION_EXAMPLE_VALUES.UNKNOWN}'. Domain should not depend on infrastructure concerns.`
 
             case REPOSITORY_VIOLATION_TYPES.CONCRETE_REPOSITORY_IN_USE_CASE:
-                return `Use case depends on concrete repository '${this.props.repositoryName || "unknown"}' instead of interface. Use dependency inversion.`
+                return `Use case depends on concrete repository '${this.props.repositoryName || VIOLATION_EXAMPLE_VALUES.UNKNOWN}' instead of interface. Use dependency inversion.`
 
             case REPOSITORY_VIOLATION_TYPES.NEW_REPOSITORY_IN_USE_CASE:
                 return `Use case creates repository with 'new ${this.props.repositoryName || "Repository"}()'. Use dependency injection instead.`
 
             case REPOSITORY_VIOLATION_TYPES.NON_DOMAIN_METHOD_NAME:
-                return `Repository method '${this.props.methodName || "unknown"}' uses technical name. Use domain language instead.`
+                return `Repository method '${this.props.methodName || VIOLATION_EXAMPLE_VALUES.UNKNOWN}' uses technical name. Use domain language instead.`
 
             default:
                 return `Repository pattern violation: ${this.props.details}`
@@ -159,8 +163,8 @@ export class RepositoryViolation extends ValueObject<RepositoryViolationProps> {
             REPOSITORY_PATTERN_MESSAGES.STEP_USE_DI,
             "",
             REPOSITORY_PATTERN_MESSAGES.EXAMPLE_PREFIX,
-            `❌ Bad: constructor(private repo: ${this.props.repositoryName || "UserRepository"})`,
-            `✅ Good: constructor(private repo: I${this.props.repositoryName?.replace(/^.*?([A-Z]\w+)$/, "$1") || "UserRepository"})`,
+            `❌ Bad: constructor(private repo: ${this.props.repositoryName || VIOLATION_EXAMPLE_VALUES.USER_REPOSITORY})`,
+            `✅ Good: constructor(private repo: I${this.props.repositoryName?.replace(/^.*?([A-Z]\w+)$/, "$1") || VIOLATION_EXAMPLE_VALUES.USER_REPOSITORY})`,
         ].join("\n")
     }
 
@@ -200,7 +204,7 @@ export class RepositoryViolation extends ValueObject<RepositoryViolationProps> {
             REPOSITORY_PATTERN_MESSAGES.STEP_AVOID_TECHNICAL,
             "",
             REPOSITORY_PATTERN_MESSAGES.EXAMPLE_PREFIX,
-            `❌ Bad: ${this.props.methodName || "findOne"}()`,
+            `❌ Bad: ${this.props.methodName || VIOLATION_EXAMPLE_VALUES.FIND_ONE}()`,
             `✅ Good: ${finalSuggestion}`,
         ].join("\n")
     }
diff --git a/packages/guardian/src/infrastructure/analyzers/HardcodeDetector.ts b/packages/guardian/src/infrastructure/analyzers/HardcodeDetector.ts
index c2517c0..e803f1d 100644
--- a/packages/guardian/src/infrastructure/analyzers/HardcodeDetector.ts
+++ b/packages/guardian/src/infrastructure/analyzers/HardcodeDetector.ts
@@ -1,6 +1,7 @@
 import Parser from "tree-sitter"
 import { IHardcodeDetector } from "../../domain/services/IHardcodeDetector"
 import { HardcodedValue } from "../../domain/value-objects/HardcodedValue"
+import { FILE_EXTENSIONS } from "../../shared/constants"
 import { CodeParser } from "../parsers/CodeParser"
 import { AstBooleanAnalyzer } from "../strategies/AstBooleanAnalyzer"
 import { AstConfigObjectAnalyzer } from "../strategies/AstConfigObjectAnalyzer"
@@ -112,9 +113,9 @@ export class HardcodeDetector implements IHardcodeDetector {
      * Parses code based on file extension
      */
     private parseCode(code: string, filePath: string): Parser.Tree {
-        if (filePath.endsWith(".tsx")) {
+        if (filePath.endsWith(FILE_EXTENSIONS.TYPESCRIPT_JSX)) {
             return this.parser.parseTsx(code)
-        } else if (filePath.endsWith(".ts")) {
+        } else if (filePath.endsWith(FILE_EXTENSIONS.TYPESCRIPT)) {
             return this.parser.parseTypeScript(code)
         }
         return this.parser.parseJavaScript(code)
diff --git a/packages/guardian/src/infrastructure/strategies/AstBooleanAnalyzer.ts b/packages/guardian/src/infrastructure/strategies/AstBooleanAnalyzer.ts
index e365539..72cd21e 100644
--- a/packages/guardian/src/infrastructure/strategies/AstBooleanAnalyzer.ts
+++ b/packages/guardian/src/infrastructure/strategies/AstBooleanAnalyzer.ts
@@ -1,6 +1,6 @@
 import Parser from "tree-sitter"
 import { HardcodedValue, HardcodeType } from "../../domain/value-objects/HardcodedValue"
-import { DETECTION_VALUES } from "../../shared/constants/rules"
+import { DETECTION_VALUES, HARDCODE_TYPES } from "../../shared/constants/rules"
 import { AstContextChecker } from "./AstContextChecker"
 
 /**
@@ -83,7 +83,7 @@ export class AstBooleanAnalyzer {
 
         return HardcodedValue.create(
             value,
-            "MAGIC_BOOLEAN" as HardcodeType,
+            HARDCODE_TYPES.MAGIC_BOOLEAN as HardcodeType,
             lineNumber,
             column,
             context,
diff --git a/packages/guardian/src/infrastructure/strategies/AstConfigObjectAnalyzer.ts b/packages/guardian/src/infrastructure/strategies/AstConfigObjectAnalyzer.ts
index 615f916..2512f28 100644
--- a/packages/guardian/src/infrastructure/strategies/AstConfigObjectAnalyzer.ts
+++ b/packages/guardian/src/infrastructure/strategies/AstConfigObjectAnalyzer.ts
@@ -1,6 +1,7 @@
 import Parser from "tree-sitter"
 import { HardcodedValue, HardcodeType } from "../../domain/value-objects/HardcodedValue"
 import { HARDCODE_TYPES } from "../../shared/constants/rules"
+import { AST_STRING_TYPES } from "../../shared/constants/ast-node-types"
 import { ALLOWED_NUMBERS } from "../constants/defaults"
 import { AstContextChecker } from "./AstContextChecker"
 
@@ -71,7 +72,9 @@ export class AstConfigObjectAnalyzer {
         }
 
         if (node.type === "string") {
-            const stringFragment = node.children.find((c) => c.type === "string_fragment")
+            const stringFragment = node.children.find(
+                (c) => c.type === AST_STRING_TYPES.STRING_FRAGMENT,
+            )
             return stringFragment !== undefined && stringFragment.text.length > 3
         }
 
diff --git a/packages/guardian/src/infrastructure/strategies/AstContextChecker.ts b/packages/guardian/src/infrastructure/strategies/AstContextChecker.ts
index c226731..7fbd61d 100644
--- a/packages/guardian/src/infrastructure/strategies/AstContextChecker.ts
+++ b/packages/guardian/src/infrastructure/strategies/AstContextChecker.ts
@@ -1,4 +1,10 @@
 import Parser from "tree-sitter"
+import {
+    AST_FIELD_NAMES,
+    AST_IDENTIFIER_TYPES,
+    AST_MODIFIER_TYPES,
+    AST_VARIABLE_TYPES,
+} from "../../shared/constants/ast-node-types"
 
 /**
  * AST context checker for analyzing node contexts
@@ -29,22 +35,26 @@ export class AstContextChecker {
      * Helper to check if export statement contains "as const"
      */
     private checkExportedConstant(exportNode: Parser.SyntaxNode): boolean {
-        const declaration = exportNode.childForFieldName("declaration")
+        const declaration = exportNode.childForFieldName(AST_FIELD_NAMES.DECLARATION)
         if (!declaration) {
             return false
         }
 
-        const declarator = this.findDescendant(declaration, "variable_declarator")
+        if (declaration.type !== "lexical_declaration") {
+            return false
+        }
+
+        const declarator = this.findDescendant(declaration, AST_VARIABLE_TYPES.VARIABLE_DECLARATOR)
         if (!declarator) {
             return false
         }
 
-        const value = declarator.childForFieldName("value")
+        const value = declarator.childForFieldName(AST_FIELD_NAMES.VALUE)
         if (value?.type !== "as_expression") {
             return false
         }
 
-        const asType = value.children.find((c) => c.type === "const")
+        const asType = value.children.find((c) => c.type === AST_MODIFIER_TYPES.CONST)
         return asType !== undefined
     }
 
@@ -83,12 +93,17 @@ export class AstContextChecker {
 
             if (current.type === "call_expression") {
                 const functionNode =
-                    current.childForFieldName("function") ||
-                    current.children.find((c) => c.type === "identifier" || c.type === "import")
+                    current.childForFieldName(AST_FIELD_NAMES.FUNCTION) ||
+                    current.children.find(
+                        (c) =>
+                            c.type === AST_IDENTIFIER_TYPES.IDENTIFIER ||
+                            c.type === AST_IDENTIFIER_TYPES.IMPORT,
+                    )
 
                 if (
                     functionNode &&
-                    (functionNode.text === "import" || functionNode.type === "import")
+                    (functionNode.text === "import" ||
+                        functionNode.type === AST_IDENTIFIER_TYPES.IMPORT)
                 ) {
                     return true
                 }
@@ -229,7 +244,13 @@ export class AstContextChecker {
     public getNodeContext(node: Parser.SyntaxNode): string {
         let current: Parser.SyntaxNode | null = node
 
-        while (current && current.type !== "lexical_declaration" && current.type !== "pair") {
+        while (
+            current &&
+            current.type !== "lexical_declaration" &&
+            current.type !== "pair" &&
+            current.type !== "call_expression" &&
+            current.type !== "return_statement"
+        ) {
             current = current.parent
         }
 
diff --git a/packages/guardian/src/infrastructure/strategies/AstNumberAnalyzer.ts b/packages/guardian/src/infrastructure/strategies/AstNumberAnalyzer.ts
index 8952e4f..d6d851c 100644
--- a/packages/guardian/src/infrastructure/strategies/AstNumberAnalyzer.ts
+++ b/packages/guardian/src/infrastructure/strategies/AstNumberAnalyzer.ts
@@ -1,6 +1,7 @@
 import Parser from "tree-sitter"
 import { HardcodedValue, HardcodeType } from "../../domain/value-objects/HardcodedValue"
 import { HARDCODE_TYPES } from "../../shared/constants/rules"
+import { TIMER_FUNCTIONS } from "../../shared/constants/ast-node-types"
 import { ALLOWED_NUMBERS, DETECTION_KEYWORDS } from "../constants/defaults"
 import { AstContextChecker } from "./AstContextChecker"
 
@@ -43,7 +44,12 @@ export class AstNumberAnalyzer {
             return false
         }
 
-        if (this.contextChecker.isInCallExpression(parent, ["setTimeout", "setInterval"])) {
+        if (
+            this.contextChecker.isInCallExpression(parent, [
+                TIMER_FUNCTIONS.SET_TIMEOUT,
+                TIMER_FUNCTIONS.SET_INTERVAL,
+            ])
+        ) {
             return true
         }
 
diff --git a/packages/guardian/src/infrastructure/strategies/AstStringAnalyzer.ts b/packages/guardian/src/infrastructure/strategies/AstStringAnalyzer.ts
index c444640..532672b 100644
--- a/packages/guardian/src/infrastructure/strategies/AstStringAnalyzer.ts
+++ b/packages/guardian/src/infrastructure/strategies/AstStringAnalyzer.ts
@@ -1,6 +1,7 @@
 import Parser from "tree-sitter"
 import { HardcodedValue, HardcodeType } from "../../domain/value-objects/HardcodedValue"
 import { CONFIG_KEYWORDS, DETECTION_VALUES, HARDCODE_TYPES } from "../../shared/constants/rules"
+import { AST_STRING_TYPES } from "../../shared/constants/ast-node-types"
 import { AstContextChecker } from "./AstContextChecker"
 import { ValuePatternMatcher } from "./ValuePatternMatcher"
 
@@ -29,7 +30,9 @@ export class AstStringAnalyzer {
      * Analyzes a string node and returns a violation if it's a magic string
      */
     public analyze(node: Parser.SyntaxNode, lines: string[]): HardcodedValue | null {
-        const stringFragment = node.children.find((child) => child.type === "string_fragment")
+        const stringFragment = node.children.find(
+            (child) => child.type === AST_STRING_TYPES.STRING_FRAGMENT,
+        )
         if (!stringFragment) {
             return null
         }
@@ -108,6 +111,7 @@ export class AstStringAnalyzer {
             "key",
             ...CONFIG_KEYWORDS.MESSAGES,
             "label",
+            ...CONFIG_KEYWORDS.TECHNICAL,
         ]
 
         return configKeywords.some((keyword) => context.includes(keyword))
diff --git a/packages/guardian/src/infrastructure/strategies/ValuePatternMatcher.ts b/packages/guardian/src/infrastructure/strategies/ValuePatternMatcher.ts
index b394c01..7e09d2a 100644
--- a/packages/guardian/src/infrastructure/strategies/ValuePatternMatcher.ts
+++ b/packages/guardian/src/infrastructure/strategies/ValuePatternMatcher.ts
@@ -1,3 +1,5 @@
+import { VALUE_PATTERN_TYPES } from "../../shared/constants/ast-node-types"
+
 /**
  * Pattern matcher for detecting specific value types
  *
@@ -131,40 +133,40 @@ export class ValuePatternMatcher {
         | "base64"
         | null {
         if (this.isEmail(value)) {
-            return "email"
+            return VALUE_PATTERN_TYPES.EMAIL
         }
         if (this.isJwt(value)) {
-            return "api_key"
+            return VALUE_PATTERN_TYPES.API_KEY
         }
         if (this.isApiKey(value)) {
-            return "api_key"
+            return VALUE_PATTERN_TYPES.API_KEY
         }
         if (this.isUrl(value)) {
-            return "url"
+            return VALUE_PATTERN_TYPES.URL
         }
         if (this.isIpAddress(value)) {
-            return "ip_address"
+            return VALUE_PATTERN_TYPES.IP_ADDRESS
         }
         if (this.isFilePath(value)) {
-            return "file_path"
+            return VALUE_PATTERN_TYPES.FILE_PATH
         }
         if (this.isDate(value)) {
-            return "date"
+            return VALUE_PATTERN_TYPES.DATE
         }
         if (this.isUuid(value)) {
-            return "uuid"
+            return VALUE_PATTERN_TYPES.UUID
         }
         if (this.isSemver(value)) {
-            return "version"
+            return VALUE_PATTERN_TYPES.VERSION
         }
         if (this.isHexColor(value)) {
             return "color"
         }
         if (this.isMacAddress(value)) {
-            return "mac_address"
+            return VALUE_PATTERN_TYPES.MAC_ADDRESS
         }
         if (this.isBase64(value)) {
-            return "base64"
+            return VALUE_PATTERN_TYPES.BASE64
         }
         return null
     }
diff --git a/packages/guardian/src/shared/constants/index.ts b/packages/guardian/src/shared/constants/index.ts
index 3933516..d7f6d3f 100644
--- a/packages/guardian/src/shared/constants/index.ts
+++ b/packages/guardian/src/shared/constants/index.ts
@@ -119,3 +119,4 @@ export const VIOLATION_SEVERITY_MAP = {
 } as const
 
 export * from "./rules"
+export * from "./ast-node-types"
diff --git a/packages/guardian/src/shared/constants/rules.ts b/packages/guardian/src/shared/constants/rules.ts
index 1aec7d2..7b22f05 100644
--- a/packages/guardian/src/shared/constants/rules.ts
+++ b/packages/guardian/src/shared/constants/rules.ts
@@ -459,7 +459,27 @@ export const CONFIG_KEYWORDS = {
     NETWORK: ["endpoint", "host", "domain", "path", "route"],
     DATABASE: ["connection", "database"],
     SECURITY: ["config", "secret", "token", "password", "credential"],
-    MESSAGES: ["message", "error", "warning", "text"],
+    MESSAGES: [
+        "message",
+        "error",
+        "warning",
+        "text",
+        "description",
+        "suggestion",
+        "violation",
+        "expected",
+        "actual",
+    ],
+    TECHNICAL: [
+        "type",
+        "node",
+        "declaration",
+        "definition",
+        "signature",
+        "pattern",
+        "suffix",
+        "prefix",
+    ],
 } as const
 
 /**