A2A MCP
Bridges local MCP hosts to A2A v1-compatible agents, exposing A2A client operations as MCP tools.
README
A2A MCP
@cognicellai/a2a-mcp is an MCP server that bridges local MCP hosts to A2A v1-compatible agents.
It exposes the A2A v1 client operation surface through MCP tools and routes A2A calls through the official @a2a-js/sdk client.
Install From npm
Install it from the official npm registry:
npm install -g @cognicellai/a2a-mcp
Or run it directly with npx:
A2A_MCP_CONFIG=/absolute/path/to/a2a-mcp.config.yaml npx -y @cognicellai/a2a-mcp
For MCP host setup, see docs/host-setup.md. For end-to-end usage examples covering no-auth, API-key, and machine-to-machine OAuth A2A agents, see docs/user-guide.md.
The installed CLI command is a2a-mcp.
For maintainers preparing a release, see docs/release.md.
Development From Source
npm install
npm run build
npm test
npm run typecheck
npm run lint:docs
Start the MCP server over stdio:
A2A_MCP_CONFIG=./a2a-mcp.config.example.yaml npm run dev
Configuration
Agents are configured by alias. Credentials are referenced by profile and resolved from the local environment; token values are never accepted as MCP tool arguments.
See a2a-mcp.config.example.yaml.
Agent Card signature handling is fail-closed by default: unsigned cards are accepted with signaturePolicy: "ifPresent", but signed cards are rejected until trust-root-backed signature verification is implemented. Use signaturePolicy: "disabled" only for explicitly trusted local or development agents.
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