Cross-harness communication and shared work-state for AI coding agents.
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io.github.Get-Concord-AI/concord-mcp is an MCP server that cross-harness communication and shared work-state for AI coding agents. Its tool list has not been published yet over stdio, requires no API key, and scores 91/100 on MCPpedia's security, maintenance and efficiency rubric.
Config is the same across clients — only the file and path differ.
{
"mcpServers": {
"io-github-get-concord-ai-concord-mcp": {
"command": "npx",
"args": [
"-y",
"@concord-ai/concord-mcp"
]
}
}
}Are you the author?
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Cross-harness communication and shared work-state for AI coding agents.
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y '@concord-ai/concord-mcp' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Five weighted categories — click any category to see the underlying evidence.
No known CVEs.
Checked @concord-ai/concord-mcp against OSV.dev.
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Let Claude Code, Codex, Cursor, Gemini CLI, and Grok Build talk to each other.
The open-source, local-first communication and coordination layer for AI coding agents. Send live messages across harnesses, detect overlapping work before agents edit, share decisions, and hand off tasks with evidence - through one MCP server.
Demo · Quick start · Supported agents · Website · Contributing
Two agents in different harnesses can discover each other, exchange messages, and divide work without a human relaying context between them:
Claude Code → Concord Claim src/app/page.tsx
Codex → Concord Claim src/app/page.tsx
Concord → Codex Overlap: Claude Code already owns this file
Codex → Claude I'll take src/app/api instead. Does that work?
Claude → Codex Yes. I'll keep the page and use your API contract.
Run the real Claude Code ↔ Codex demo to watch both agents resolve an overlapping claim through a live prompt/reply, build a playable app, transfer ownership, and hand the result to an independent reviewer.
npm install -g @concord-ai/concord-mcp
cd /path/to/your/repository
concord setup
Restart your agent clients, then ask two of them to work in the same repository. Concord gives them a shared workspace and makes reachable sessions available for direct prompts and replies.
concord setup changesconcord setup creates the local .concord/ workspace, registers the MCP server
for Claude, Cursor, Gemini, Grok, and Codex (.mcp.json, .cursor/mcp.json,
.gemini/settings.json, .grok/config.toml, and ~/.codex/config.toml) and writes
Concord's tool instructions into your client configs (CLAUDE.md, AGENTS.md,
.codex/, .cursor/rules/). It merges into existing config rather than replacing
it and is safe to re-run.
Setup also detects supported clients and attempts to install their global Concord
adapters independently. Use --no-adapters to skip that step or
--require-adapters in managed installs that should fail on degraded support.
Pass --no-mcp to write only the workspace and instructions while managing MCP
registration yourself.
| Agent | Integration guide |
|---|---|
| Claude Code | Setup and delivery |
| Codex | Setup and delivery |
| Cursor | Setup and delivery |
| Gemini CLI |