refactor(cliproxy): address PR review suggestions

- Add hash collision risk note to sanitizer docs (6-char MD5 = ~16M combos)
- Fix VALID_CHARS_REGEX comment to include '/' character
- Use getCcsDir() instead of os.homedir() for log path (CLAUDE.md compliance)
- Add JSDoc for isRecord type guard helper

src/cliproxy/tool-name-sanitizer.ts

@@ -4,11 +4,14 @@
  * Sanitizes MCP tool names to comply with Gemini API constraints:
  * - Max 64 characters
  * - Must start with letter or underscore
- * - Only a-z A-Z 0-9 _ . : - allowed
+ * - Only a-z A-Z 0-9 _ . : - / allowed
  *
  * Strategies:
  * 1. Remove duplicate segments (e.g., gitmcp__foo__foo → gitmcp__foo)
  * 2. Smart truncate with hash suffix if still >64 chars
+ *
+ * Note: Hash collision risk is ~1 in 16M with 6-char MD5 prefix.
+ * Acceptable for typical MCP tool counts (<1000 tools).
  */
 
 import { createHash } from 'crypto';

src/cliproxy/tool-sanitization-proxy.ts

@@ -13,9 +13,9 @@ import * as http from 'http';
 import * as https from 'https';
 import * as fs from 'fs';
 import * as path from 'path';
-import * as os from 'os';
 import { URL } from 'url';
 import { ToolNameMapper, type Tool, type ContentBlock } from './tool-name-mapper';
+import { getCcsDir } from '../utils/config-manager';
 
 export interface ToolSanitizationProxyConfig {
   /** Upstream CLIProxy URL */
@@ -28,6 +28,10 @@ export interface ToolSanitizationProxyConfig {
   timeoutMs?: number;
 }
 
+/**
+ * Type guard to check if a value is a plain object (Record).
+ * Used for safely accessing properties on unknown JSON values.
+ */
 function isRecord(value: unknown): value is Record<string, unknown> {
   return typeof value === 'object' && value !== null && !Array.isArray(value);
 }
@@ -54,8 +58,7 @@ export class ToolSanitizationProxy {
    * Initialize log file path and ensure directory exists.
    */
   private initLogFile(): string {
-    const ccsDir = process.env.CCS_HOME || path.join(os.homedir(), '.ccs');
-    const logsDir = path.join(ccsDir, 'logs');
+    const logsDir = path.join(getCcsDir(), 'logs');
 
     try {
       if (!fs.existsSync(logsDir)) {
@@ -63,6 +66,7 @@ export class ToolSanitizationProxy {
       }
     } catch {
       // Fallback to temp directory if logs dir creation fails
+      const os = require('os');
       return path.join(os.tmpdir(), 'tool-sanitization-proxy.log');
     }