The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the MCP Test Runner listing page.
MCP server for deterministic local test execution and normalized test result reporting.
mcp-test-runner is the verification layer for codebase onboarding agents. It exposes focused MCP tools for running pytest and Jest, parsing test output, and summarizing coverage so downstream agents can mark claims as verified, unverified, or contradicted by real execution.
mcp-test-runner is the verification layer in a three-server MCP tool stack for Project 6 wayfinder, a codebase onboarding agent.
mcp-repo-mapper maps repository structure, languages, entry points, framework evidence, and Python dependency edges.mcp-ast-explorer provides symbol-grounded Python definition, signature, reference, call-chain, and class-hierarchy lookups.mcp-test-runner runs local pytest/Jest checks and coverage summaries so agent claims can be verified against execution.In wayfinder, this server turns high-risk code understanding claims into verified, unverified, or contradicted evidence from real test execution.
This repository is a Python-first v1 MCP test runner. It supports bounded pytest execution, Jest command execution, single-test targeting, pytest coverage summaries, and normalized pytest/Jest JSON parsing.
The server does not use an LLM. Test results come from subprocess execution and structured parser output.
| Tool | Purpose |
|---|---|
health() | Returns ok for smoke checks. |
run_pytest(path, test_filter?, timeout_seconds?, cpu_seconds?, memory_mb?) | Run pytest in a bounded working directory and return raw command output. |
run_jest(path, test_filter?, timeout_seconds?, cpu_seconds?, memory_mb?) | Run Jest through npx jest and return raw command output. |
run_single_test(path, test_id, framework?, timeout_seconds?, cpu_seconds?, memory_mb?) | Run one pytest node id or one Jest test-name pattern. |
parse_test_output(stdout, framework) | Normalize test runner JSON output. |
get_coverage_summary(path, framework?, timeout_seconds?, cpu_seconds?, memory_mb?) | Return pytest-cov JSON coverage totals. |
pytest-json-report.npx jest --json --outputFile.TestRunResult schema..coverage.json.resource.setrlimit CPU / memory caps.resource.setrlimit.npx-resolvable Jest.--testNamePattern; it does not parse Jest file-specific node ids.parse_test_output to normalize framework JSON.Install dependencies:
The PyPI distribution name is lovranran-mcp-test-runner because mcp-test-runner is already taken on PyPI. The installed console script remains mcp-test-runner.
Run the MCP server:
Run verification:
MIT