MCP Reticle
About
Reticle intercepts, visualizes, and profiles JSON-RPC traffic between your LLM and MCP servers in real-time, with zero latency overhead. Stop debugging blind. Start seeing everything.
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Setup
Install MCP Reticle in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/labterminal/mcp-reticle
Follow the installation instructions in the repository README, then restart your MCP client.
The Wireshark for the Model Context Protocol (MCP)
Reticle intercepts, visualizes, and profiles MCP JSON-RPC traffic in real time — designed for microsecond-level overhead.
Quick start·Install·Docs·Security·Contributing
Reticle is a proxy + UI for debugging MCP integrations:
- inspect raw JSON-RPC messages (requests / notifications / responses)
- correlate request ↔ response instantly
- profile latency and token estimates
- capture server stderr and crashes
- record sessions and export logs
Supported transports:stdio,Streamable HTTP,WebSocket,HTTP/SSE.
# npm npm install -g mcp-reticle # pip pip install mcp-reticle # Homebrew brew install labterminal/mcp-reticle/mcp-reticle
Replace your MCP server command withmcp-reticle run --name <name> -- <command...>.
{ "mcpServers": { "filesystem": { "command": "mcp-reticle", "args": ["run", "--name", "filesystem", "--", "npx", "-y", "@modelcontextprotocol/server-filesystem", "/Users/me/work"] } } }
mcp-reticle run --log -- npx -y @modelcontextprotocol/server-memory
Optional: proxy an HTTP-based MCP server
mcp-reticle proxy --name api --upstream http://localhost:8080 --listen 3001
git clone https://github.com/labterminal/mcp-reticle.git cd mcp-reticle just build
All guides and deep dives are in theGitHub Wiki:
- Getting started
- CLI reference
- Client configuration
- Troubleshooting
- Architecture
- Security & privacy
- Development
- Exports
Reticle can capture tool inputs/outputs and server stderr. Treat recordings and exports assensitiveartifacts.
Recommended reading:Security & privacy
- Repo guidelines:CONTRIBUTING.md
- Dev setup and commands:Development guide
This is a web browser that enables your coding agent, such as Claude Code, to visit websites on your behalf and assist you in identifying bugs or creating UI test cases.
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