batch-runner-mcp

Run several bash steps in one MCP call, and know whether each one actually did what you wanted.

A zero exit code only proves a command ran. With omega_batch, every step can carry an expect assertion (contains / notContains / regex). Each step is reported as ok, FAIL (process) or FAIL (expectation), with exit code, signal, timeout and stderr kept separate. Steps skipped after a failure are listed as (halted) instead of silently disappearing.

Zero npm dependencies. Node >= 20. Works with any MCP host that speaks stdio (Claude Code, opencode, Claude Desktop, ...).

Install

Claude Code:

claude mcp add batch-runner -- npx -y github:Birdywen/batch-runner-mcp

Generic JSON config (mcpServers):

{ "batch-runner": { "command": "npx", "args": ["-y", "github:Birdywen/batch-runner-mcp"] } }

opencode (opencode.json, mcp section):

{ "batch-runner": { "type": "local", "command": ["npx", "-y", "github:Birdywen/batch-runner-mcp"] } }

Then call omega_health once. The first line is the verdict (HEALTHY / DEGRADED); optional parts that are missing show as [--].

Related MCP server: Bash MCP Server

Example

{ "steps": [
  { "label": "build", "command_line": "npm run build", "expect": { "contains": ["compiled successfully"] } },
  { "label": "smoke", "command_line": "node dist/cli.js --version", "env": { "NO_COLOR": "1" }, "expect": { "regex": "^\\d+\\.\\d+" } }
], "stopOnError": true }

omega_batch waits for the verdict (up to waitMs, default 45s) and answers in the same call. Success is one line:

batch job-xxxx: success 2/2 (3.1s): build | smoke

A failure shows the exit code and the tail of the output, where errors are:

batch job-xxxx: failed 1/2 (0.4s)
  [FAIL] 1. build (process)
      exit=2
      src/a.ts(3,7): error TS2322: Type 'string' is not assignable to type 'number'.
  [--] 2. (halted) -- stopOnError

• expect is checked against the full output. Output over 4000 chars goes to an artifact:// ref.

• Still running after waitMs: the reply has the job id; omega_batch_status {id, waitMs} picks it up. cancel: true kills the running step's process group.

• Job state is on disk after every step; after a restart an unfinished job reads as interrupted.

• format: "json" gives structured per-step fields; verbose: true adds output.

Tools

Nine tools, about 1.8k tokens of schema in total.

omega_flow (multi-step tool composition, see OMEGA-FLOW.md) is off by default; set OMEGA_FLOW=1 to advertise it.

Configuration

Everything works with defaults. Common overrides:

Batch shells get /opt/homebrew/bin and /usr/local/bin prepended to PATH; a per-step env.PATH still wins.

Development

npm test

The MCP server loads code once at startup: restart the host after changing it.

omega_grep keeps rg and the grep fallback in step: the fallback uses ERE (so a|b works) and passes exactly one matcher flag (GNU grep rejects -E -F). OMEGA_GREP_TRACE=1 dumps the argv so the suite can assert on it.