Act

MCP stdio server exposing three tools for running GitHub Actions locally via act.

Peer dependency: act

act must be installed and in PATH:

# macOS
brew install act

# Linux
curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash

MCP Tools

list_workflows

Globs .github/workflows/*.yml and returns job names from each file.

Field	Type	Description
cwd	string?	Repo root (default: process.cwd())

Returns: Array<{ file: string, jobs: string[] }>

run_job

Spawns act -j <jobName>, captures stdout+stderr, caches logs.

Field	Type	Description
jobName	string	Job ID (key under jobs: in the YAML)
cwd	string?	Repo root (default: process.cwd())

Returns: { exitCode: number, logs: string }

get_logs

Returns logs cached by the most recent run_job call.

Returns: { logs: string | null }

Agent loop

list_workflows → pick failing job
run_job        → read exitCode + logs
get_logs       → inspect failure output
(patch YAML)
run_job        → verify fix

MCP client config (Claude Desktop)

{
  "mcpServers": {
    "act-mcp": {
      "command": "npx",
      "args": ["act-mcp"]
    }
  }
}

Or point cwd at a specific repo:

{
  "mcpServers": {
    "act-mcp": {
      "command": "npx",
      "args": ["act-mcp"],
      "env": {}
    }
  }
}

Pass cwd as a tool argument at call time:

{ "name": "list_workflows", "arguments": { "cwd": "/path/to/repo" } }

Development

npm install
npm run build   # tsc → dist/
npm test        # vitest (uses mock act binary, no act required)
npm run dev     # run via tsx without building

Environment variables

Variable	Default	Description
ACT_BIN	act	Path to the act binary (useful for testing)