mcp-reticle
Verified Safeby azerzeki
Overview
Reticle intercepts, visualizes, and profiles JSON-RPC traffic between LLM clients and Model Context Protocol (MCP) servers in real-time for debugging and observability.
Installation
mcp-reticle run --name my-server -- python -m my_mcp_serverEnvironment Variables
- RETICLE_VERSION
- RETICLE_INSTALL_DIR
- RETICLE_SOCKET
- RUST_LOG
Security Notes
The application implements strong security measures for a local debugging tool. It binds HTTP proxies to localhost (127.0.0.1) only, preventing external network access. It enforces a configurable command allowlist ('npx', 'node', 'python', 'deno', 'bun', etc.) for executed MCP server processes, mitigating arbitrary command execution risks. CORS is restricted to localhost origins. Session IDs are cryptographically secure. Minor points are deducted for current usage of `eprintln!` which the project's own `SECURITY.md` notes as a future improvement for structured logging, though this is not a critical vulnerability for a local debugging tool. The `avg_tokens_per_call` is 0 because Reticle itself is a debugger/profiler, not an agent that makes LLM calls; it *estimates* token usage of other services.
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