[drQedwards]

Document rcm-rs (RCM) as an extension of RMCP that uses the LET imperative to expose polyglot package-management operations as MCP tools.

Motivation and Context

RCM is a polyglot package manager (Cargo, NPM, Composer/PPM, system packages) built around the LET imperative. It integrates the official RMCP SDK so AI agents can discover and invoke package-management, build, deploy, and workspace operations over the Model Context Protocol.

Listing it under Extending rmcp makes the ecosystem more discoverable and shows a concrete example of using RMCP + LET together.

How Has This Been Tested?

Documentation-only change. Links to the RCM repository and crates.io page were verified.

Breaking Changes

None. This is a pure documentation update.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

Change is limited to the Related Projects → Extending rmcp section of the root README.

Suggested entry:

• rcm-rs (crates.io) – Extends RMCP with the LET imperative: a polyglot package-manager surface (Cargo, NPM, Composer/PPM, system packages) exposed as MCP tools so AI agents can drive installs, builds, de​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

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