gossipcat — Claude Code MCP server: what it does, how to install
Orchestrates multi-agent consensus code reviews by cross-checking findings against actual source lines. Filters false alarms before you read them.
claude mcp add --env GOOGLE_API_KEY=<GOOGLE_API_KEY> --env GOSSIPCAT_PORT=<GOSSIPCAT_PORT> --transport stdio gossipcat -- npx -y gossipcatWhat gossipcat does
A single AI reviewer often reports bugs that do not exist. gossipcat coordinates parallel agents so each verifies peer reports against real file:line locations in your repository. Fake issues get eliminated immediately.
The orchestrator tracks accuracy metrics for every participant and routes tasks toward historically reliable agents. When an agent fails repeatedly in a category, the system writes markdown skill files from past mistakes to adjust future prompts. It also serves a live browser dashboard and a web chat bridge.
Running npx -y gossipcat requires Node 22 or newer on your system. A baseline two-agent setup runs directly on your editor subscription without extra API keys, while connecting external relay models requires their respective tokens.
What it helps with
- filter out hallucinated code review comments before inspection
- verify reported line numbers mechanically against your source files
- route review tasks based on agent accuracy metrics
- generate persistent failure-recovery markdown skill files
Example prompts for the agent
- Form a gossipcat review group for this repository
- Run a consensus code review on my latest git diff
- Inspect recent file edits and launch the gossipcat monitor
How to install gossipcat
Platform CLI
claude mcp add --env GOOGLE_API_KEY=<GOOGLE_API_KEY> --env GOSSIPCAT_PORT=<GOSSIPCAT_PORT> --transport stdio gossipcat -- npx -y gossipcatReplace <…> with your own values
Platform CLI
codex mcp add gossipcat --env GOOGLE_API_KEY=<GOOGLE_API_KEY> --env GOSSIPCAT_PORT=<GOSSIPCAT_PORT> -- npx -y gossipcatReplace <…> with your own values
Config file
{
"mcpServers": {
"gossipcat": {
"command": "npx",
"args": [
"-y",
"gossipcat"
],
"env": {
"GOOGLE_API_KEY": "<GOOGLE_API_KEY>",
"GOSSIPCAT_PORT": "<GOSSIPCAT_PORT>"
}
}
}
}Replace <…> with your own values
Config file
{
"servers": {
"gossipcat": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"gossipcat"
],
"env": {
"GOOGLE_API_KEY": "<GOOGLE_API_KEY>",
"GOSSIPCAT_PORT": "<GOSSIPCAT_PORT>"
}
}
}
}Replace <…> with your own values
Platform CLI
gemini mcp add -e GOOGLE_API_KEY=<GOOGLE_API_KEY> -e GOSSIPCAT_PORT=<GOSSIPCAT_PORT> gossipcat npx -y gossipcatReplace <…> with your own values
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about gossipcat
How to install gossipcat in Claude Code?
Run claude mcp add gossipcat -e GOOGLE_API_KEY=<GOOGLE_API_KEY> -- npx -y gossipcat. If you need stdio transport with custom ports, use claude mcp add --env GOOGLE_API_KEY=<GOOGLE_API_KEY> --env GOSSIPCAT_PORT=<GOSSIPCAT_PORT> --transport stdio gossipcat -- npx -y gossipcat.
What does gossipcat do?
It coordinates multiple AI agents to cross-verify review findings against your codebase. False alarms are discarded while verified bugs receive clear confidence labels.
Are external API keys required to run gossipcat?
No, a minimal pairing of native subagents runs entirely on your host IDE subscription. You only need API credentials if you choose to connect third-party model relays.
