release: 12.40.0

[stainless-app]

Automated Release PR

12.40.0 (2025-11-07)

Full Changelog: v12.39.0...v12.40.0

Features

• mcp: enable optional code execution tool on http mcp servers (d167a15)

Bug Fixes

• mcpb: pin @anthropic-ai/mcpb version (50c12b7)

Chores

• internal: codegen related update (65e0bac)
• internal: grammar fix (it's -> its) (1e1452d)
• mcp code tool explicit error message when missing a run function (45fa155)
• mcp: add friendlier MCP code tool errors on incorrect method invocations (0786aa6)
• mcp: add line numbers to code tool errors (678df34)
• use structured error when code execution tool errors (baedc1f)

Documentation

• mcp: add a README button for one-click add to Cursor (947ee8e)
• mcp: add a README link to add server to VS Code or Claude Code (d687756)

---

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🔗 Stainless website
📚 Read the docs
🙋 Reach out for help or questions

[stainless-app]

🧪 Testing

    To try out this version of the SDK, run:
    ```
    npm install 'https://pkg.stainless.com/s/conductor-node/d687756499c7d7c466d53a84dcc5af0ef004d72d/dist.tar.gz'
    ```

    _Expires: Sun, 07 Dec 2025 03:54:34 GMT_