Enable AI Agents to fix build failures from CircleCI.
If you want an AI assistant working directly with CircleCI, the circleci mcp server is the bridge. Enable AI Agents to fix build failures from CircleCI.
Model Context Protocol (MCP) is a new, standardized protocol for managing context between large language models (LLMs) and external systems. In this repository, we provide an MCP Server for CircleCI.
The server is distributed via npm as @circleci/mcp-server-circleci, so most clients can run it without a manual build step. Add it to your MCP client's configuration and restart the client to pick it up — the copy-paste configs for Claude Desktop, Claude Code and Cursor are on this page.
Before the server will start you need to supply 6 environment variables: CIRCLECI_TOKEN, CIRCLECI_BASE_URL, MAX_MCP_OUTPUT_LENGTH, YOUR_CIRCLECI_TOKEN, REQUIRE_REQUEST_TOKEN, MCP_BIND_HOST. Keep credentials in your client's env block or a secrets manager rather than committing them.
Developer-tool servers are usually the first ones people connect, because they turn "help me with this code" into an assistant that can actually read the repo and act on it. CircleCI sits in that group. Worth comparing against the other developer tools servers in this directory before you commit to one, since several overlap in scope but differ sharply in setup cost and permissions.
{
"mcpServers": {
"circleci-mcp-server": {
"command": "npx",
"args": ["-y", "@circleci/mcp-server-circleci@latest"],
"env": {
"CIRCLECI_TOKEN": "your-circleci-token",
"CIRCLECI_BASE_URL": "https://circleci.com",
"MAX_MCP_OUTPUT_LENGTH": "50000"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| CIRCLECI_TOKEN | Credential the server authenticates with. | Yes |
| CIRCLECI_BASE_URL | Endpoint or connection string the server talks to. | Yes |
| MAX_MCP_OUTPUT_LENGTH | Configuration value read at startup. | Optional |
| YOUR_CIRCLECI_TOKEN | Credential the server authenticates with. | Yes |
| REQUIRE_REQUEST_TOKEN | Credential the server authenticates with. | Yes |
| MCP_BIND_HOST | Endpoint or connection string the server talks to. | Optional |
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