Epistates/TurboMCP

v2.0.5 Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 7mo MCP Developer Tools

✓ No known CVEs patched

✓ No known CVEs patched in this version

Topics

mcp mcp-client mcp-sdk mcp-server mcp-servers rust

Summary

AI summary

Fixed regression causing observability logs to be written to stdout instead of stderr, corrupting JSON-RPC protocol messages.

Full changelog

Observability stderr output bug: Fixed regression where observability logs were being written to stdout instead of stderr
- Per MCP specification, stdout must be reserved exclusively for JSON-RPC protocol messages
- Logs were corrupting the protocol stream when mixing with JSON-RPC responses
- Root cause: tracing_subscriber fmt::layer() was missing explicit .with_writer(std::io::stderr) configuration
- Now correctly outputs all observability logs to stderr
- Added integration test in examples/stdio_output_verification.rs to prevent future regressions

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About Epistates/TurboMCP

TurboMCP SDK: Enterprise MCP SDK in Rust