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Changes Summary: Claude Desktop Filesystem Access

What Was Fixed

Fixed the "read-only file system" error in Claude Desktop by adding support for filesystem permissions configuration.

Changes Made

1. Code Changes (src/mcp-server.ts)

  • ✅ Added OUTFILE_DIR environment variable (defaults to process.cwd())
  • ✅ Updated file path handling to use join(OUTFILE_DIR, filename)
  • ✅ Added support for both absolute and relative paths
  • ✅ Backward compatible with Cursor (no breaking changes)

2. Documentation Updates

  • ✅ MCP_SETUP.md - Added Claude Desktop allowedDirectories configuration
  • ✅ README.md - Separate configs for Cursor vs Claude Desktop
  • ✅ env.example - Added OUTFILE_DIR documentation
  • ✅ CURSOR_CONFIG_EXAMPLE.json - Added Claude Desktop notes
  • ✅ CLAUDE_DESKTOP_CONFIG_EXAMPLE.json - New dedicated example (NEW FILE)
  • ✅ CLAUDE_DESKTOP_SETUP.md - Comprehensive setup guide (NEW FILE)
  • ✅ CHANGES_SUMMARY.md - This file (NEW FILE)

3. Testing

  • ✅ All 61 tests pass
  • ✅ No breaking changes
  • ✅ Build successful

How to Use in Claude Desktop

Quick Config

  1. Create directory:

    mkdir -p ~/Documents/Transcripts

  2. Edit config: ~/Library/Application Support/Claude/claude_desktop_config.json

    {
  "mcpServers": {
    "audio-transcription": {
      "command": "npx",
      "args": ["-y", "audio-transcription-mcp"],
      "env": {
        "OPENAI_API_KEY": "sk-your-key-here",
        "INPUT_DEVICE_NAME": "BlackHole",
        "OUTFILE_DIR": "/Users/yourname/Documents/Transcripts"
      },
      "allowedDirectories": [
        "/Users/yourname/Documents/Transcripts"
      ]
    }
  }
}

  3. Restart Claude Desktop

  4. Test: Say "Start transcribing audio"

How Cursor Users Are Affected

No changes needed! Cursor continues to work exactly as before:

{
  "mcpServers": {
    "audio-transcription": {
      "command": "npx",
      "args": ["-y", "audio-transcription-mcp"],
      "env": {
        "OPENAI_API_KEY": "sk-your-key-here",
        "INPUT_DEVICE_NAME": "BlackHole"
      }
    }
  }
}
  • No OUTFILE_DIR required (defaults to current directory)
  • No allowedDirectories needed (Cursor has broader permissions)
  • All existing configs continue to work

Technical Details

Why This Works

  1. OUTFILE_DIR Environment Variable

    • Specifies where transcript files should be written
    • Defaults to process.cwd() for backward compatibility
    • Required for Claude Desktop filesystem access

  2. allowedDirectories Configuration

    • Claude Desktop security feature
    • Grants MCP server write access to specific directories
    • Must match the path in OUTFILE_DIR

  3. Path Handling

    • Files are written to join(OUTFILE_DIR, filename)
    • Supports both absolute and relative paths
    • Handles timestamped filenames correctly

File Locations

Transcripts are now saved to:

  • Cursor: Current working directory (as before)
  • Claude Desktop: OUTFILE_DIR (e.g., ~/Documents/Transcripts/)

Each session gets a unique timestamped filename for privacy/isolation.

Verification

Check that everything works:

# 1. Verify build
npm run build

# 2. Run tests
npm test

# 3. Check dist files
ls -la dist/

# 4. Test in Claude Desktop
# Say: "Start transcribing audio and show me the status"

Files Modified

Modified:
  src/mcp-server.ts
  MCP_SETUP.md
  README.md
  env.example
  CURSOR_CONFIG_EXAMPLE.json

Created:
  CLAUDE_DESKTOP_CONFIG_EXAMPLE.json
  CLAUDE_DESKTOP_SETUP.md
  CHANGES_SUMMARY.md

Built:
  dist/mcp-server.js (updated)
  dist/mcp-server.d.ts (updated)

Next Steps

  1. Test in Claude Desktop with the new configuration
  2. Publish to npm so others can use with npx
  3. Update CHANGELOG.md with version bump
  4. Consider adding to official Claude Desktop MCP server directory

Questions?