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r33drichards/mcp-js

v0.12.0 Breaking

This release includes 1 breaking change for platform teams planning a safe upgrade.

Published 1mo MCP Developer Tools
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

javascript mcp mcp-server

Affected surfaces

auth breaking_upgrade

ReleasePort's take

Moderate signal
editorial:auto 1mo

The /api/tools endpoint has been removed in v0.12.0.

Why it matters: This breaking change eliminates the /api/tools surface; update any integrations before deploying v0.12.0 to avoid runtime errors.

Summary

AI summary

Removed /api/tools endpoint, a breaking change.

Changes in this release

Breaking High

Removes /api/tools endpoint.

Removes /api/tools endpoint.

Source: llm_adapter@2026-06-07

Confidence: high

 —
Feature Medium

Adds dynamic fetch OAuth credential injection.

Adds dynamic fetch OAuth credential injection.

Source: llm_adapter@2026-06-07

Confidence: high

 —
Feature Medium

Adds CLI flags to override MCP server instructions and run_js description.

Adds CLI flags to override MCP server instructions and run_js description.

Source: llm_adapter@2026-06-07

Confidence: high

 —
Feature Medium

Adds WASM module stubs on the MCP surface.

Adds WASM module stubs on the MCP surface.

Source: llm_adapter@2026-06-07

Confidence: high

 —
Bugfix Medium

Fixes mermaid diagram rendering on sub-pages.

Fixes mermaid diagram rendering on sub-pages.

Source: llm_adapter@2026-06-07

Confidence: high

 —
Full changelog

What's Changed

  • Remove /api/tools endpoint by @r33drichards in https://github.com/r33drichards/mcp-js/pull/154
  • feat: add dynamic fetch oauth credential injection by @r33drichards in https://github.com/r33drichards/mcp-js/pull/153
  • docs: add mkdocs docs skeleton design by @r33drichards in https://github.com/r33drichards/mcp-js/pull/155
  • Update mcp-pass-through.md by @r33drichards in https://github.com/r33drichards/mcp-js/pull/157
  • Fix mermaid diagram rendering on sub-pages by @r33drichards in https://github.com/r33drichards/mcp-js/pull/158
  • Remove explanation of stubs and run_js by @r33drichards in https://github.com/r33drichards/mcp-js/pull/159
  • Update mcp-pass-through.md by @r33drichards in https://github.com/r33drichards/mcp-js/pull/160
  • Add WASM module stubs on the MCP surface by @r33drichards in https://github.com/r33drichards/mcp-js/pull/161
  • docs: four-pillar (Diátaxis) restructure + disable JSX/TSX parsing by @r33drichards in https://github.com/r33drichards/mcp-js/pull/162
  • Add CLI flags to override MCP server instructions and run_js description by @r33drichards in https://github.com/r33drichards/mcp-js/pull/163

Full Changelog: https://github.com/r33drichards/mcp-js/compare/v0.11.0...v0.12.0

Breaking Changes

  • Removed /api/tools endpoint
View diff on GitHub

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About r33drichards/mcp-js

A Javascript code execution sandbox that uses v8 to isolate code to run AI generated javascript locally without fear. Supports heap snapshotting for persistent sessions.

All releases →

Related context

Earlier breaking changes

  • v0.11.0 Switch license from ISC to GNU Affero General Public License v3

Beta — feedback welcome: [email protected]