TwelveTake-Studios/reaper-mcp

v1.2.1 Breaking

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

Published 1mo MCP Developer Tools

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

ai claude daw mastering mcp midi

+4 more

mixing model-context-protocol music-production reaper

Affected surfaces

breaking_upgrade

ReleasePort's take

Moderate signal

editorial:auto 1mo

The release deprecates the HTTP bridges (reaper_web_server.lua and reaper_web_server.py), marking them as no longer maintained.

Why it matters: Deprecation of HTTP bridge APIs means existing integrations relying on these endpoints will stop receiving support; migrate before they are removed.

Summary

AI summary

Deprecated the HTTP bridges which are no longer maintained.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Low	Adds optional `dev` dependency group and ruff configuration to pyproject.toml. Adds optional `dev` dependency group and ruff configuration to pyproject.toml. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Adds GitHub Actions CI running ruff and pytest on Python 3.10‑3.13. Adds GitHub Actions CI running ruff and pytest on Python 3.10‑3.13. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Adds mocked pytest suite in `tests/` to exercise tools without REAPER running. Adds mocked pytest suite in `tests/` to exercise tools without REAPER running. Source: llm_adapter@2026-06-11 Confidence: high	—
Deprecation	High	Deprecates HTTP bridges (reaper_web_server.lua / reaper_web_server.py). Deprecates HTTP bridges (reaper_web_server.lua / reaper_web_server.py). Source: llm_adapter@2026-06-11 Confidence: high	—
Refactor	Low	Rewrites test_connection.py to use file bridge, removing httpx dependency. Rewrites test_connection.py to use file bridge, removing httpx dependency. Source: llm_adapter@2026-06-11 Confidence: high	—

Full changelog

Infrastructure release — no tool contract changes. 135 tools, fully backward compatible.

Added

Mocked pytest suite (tests/) that exercises tools without REAPER running.
GitHub Actions CI (ruff + pytest on Python 3.10–3.13).
dev optional-dependency group and ruff configuration in pyproject.toml.

Changed

Rewrote test_connection.py to test the file bridge (the supported path) instead of the deprecated HTTP server. Now pure standard library — no httpx needed to smoke-test.
Documented the file-based Lua bridge as the only supported communication path.

Deprecated

HTTP bridges (reaper_web_server.lua / reaper_web_server.py). Kept for existing users but no longer maintained; they will not receive new tools and may be removed in v2.0.

Full changelog: https://github.com/TwelveTake-Studios/reaper-mcp/blob/main/CHANGELOG.md

Breaking Changes

HTTP bridges (`reaper_web_server.lua` and `reaper_web_server.py`) are deprecated and may be removed in v2.0.

View diff on GitHub

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About TwelveTake-Studios/reaper-mcp

MCP server enabling AI assistants to control REAPER DAW for mixing, mastering, MIDI composition, and full music production with 129 tools

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Related context

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Earlier breaking changes

v1.3.2 `render_project` now requires an explicit `overwrite` parameter to allow file overwriting.