mcp-rtk 1.0.0

Token-optimizing MCP proxy — sits between Claude and upstream MCP servers, compressing tool responses by 60-90%

Coverage
90.59%
77 out of 85 items documented12 out of 40 items with examples
Size
Source code size: 163.86 kB This is the summed size of all the files inside the crates.io package for this release.
Documentation size: 1.85 MB This is the summed size of all files generated by rustdoc for all configured targets
Ø build duration
this release: 1m 48s Average build duration of successful builds.
all releases: 1m 47s Average build duration of successful builds in releases after 2024-10-23.
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crates.io
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mcp-rtk

A token-optimizing MCP proxy that sits between Claude and any upstream MCP server, compressing tool responses to reduce token consumption by 60–90%.

Architecture

Claude ←(stdio)→ mcp-rtk ←(stdio/subprocess)→ upstream MCP server

mcp-rtk is both an MCP server (for Claude) and an MCP client (for upstream). It forwards list_tools and call_tool requests, applying JSON compression filters on responses before returning them.

Modules

[config] — TOML configuration loading with per-tool filter rules.
[filter] — The 8-stage filter pipeline and generic JSON compression functions.
[proxy] — ProxyServer and ProxyClient implementing the MCP server/client handlers.
[tracking] — SQLite-backed token savings metrics.