Is the MCP Test Runner MCP server free to use?

Yes. MCP Test Runner is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Is the MCP Test Runner MCP server free to use?

Yes. MCP Test Runner is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

MCP Test Runner

Local test execution and coverage summaries for onboarding agents.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Install Config Generator

Choose your client

claude_desktop_config.json

{
  "mcpServers": {
    "mcp-test-runner": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-test-runner"
      ]
    }
  }
}

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

Documentation Overview

mcp-test-runner

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.

Codebase Onboarding Stack

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.

Status

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.

Tools

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.

Supported Scope

Python 3.11+ package.
FastMCP 2.x server.
pytest execution with JSON report output via pytest-json-report.
Jest command execution via npx jest --json --outputFile.
pytest and Jest JSON normalization into one TestRunResult schema.
Single pytest node id execution and Jest test-name targeting.
pytest-cov coverage summary from .coverage.json.
Subprocess timeout plus POSIX resource.setrlimit CPU / memory caps.

Current Limitations

v1 does not use Docker. It uses cwd validation, subprocess timeouts, and POSIX resource limits.
Resource limits require a POSIX platform that supports resource.setrlimit.
Jest execution expects Node.js plus project-local or npx-resolvable Jest.
Jest single-test targeting uses --testNamePattern; it does not parse Jest file-specific node ids.
Coverage summary is pytest-only in v1.
Tools return raw command output for execution; call parse_test_output to normalize framework JSON.

Local Development

Install dependencies:

bash

uv sync --extra dev

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:

bash

uv run mcp-test-runner

Run verification:

bash

uv run ruff check .
uv run mypy
uv run pytest

License

MIT

Related MCP Servers

View all in Developer Tools View all alternatives

Frequently Asked Questions about MCP Test Runner

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mcp-test-runner": { "command": "npx", "args": ["-y", "MCP Test Runner"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

★ Featured

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The official MCP server for AllMCPs.com - submit and manage tools directly from your AI. The open directory for MCP servers. Connect Claude, Cursor, Windsurf, and AI agents to databases, tools, files, and APIs. Explore 3,181+ servers. AllMCPs is the premier, open directory for discovering, evaluating, and installing Model Context Protocol (MCP) servers to equip AI agents and LLMs with real-world superpowers.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to MCP Test Runner →Install in Claude Desktop Install in Cursor Install in VS Code

MCP Test Runner

Local test execution and coverage summaries for onboarding agents.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Install Config Generator

Choose your client

claude_desktop_config.json

{
  "mcpServers": {
    "mcp-test-runner": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-test-runner"
      ]
    }
  }
}

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

Documentation Overview

mcp-test-runner

MCP server for deterministic local test execution and normalized test result reporting.

Codebase Onboarding Stack

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.

Status

The server does not use an LLM. Test results come from subprocess execution and structured parser output.

Tools

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.

Supported Scope

Python 3.11+ package.
FastMCP 2.x server.
pytest execution with JSON report output via pytest-json-report.
Jest command execution via npx jest --json --outputFile.
pytest and Jest JSON normalization into one TestRunResult schema.
Single pytest node id execution and Jest test-name targeting.
pytest-cov coverage summary from .coverage.json.
Subprocess timeout plus POSIX resource.setrlimit CPU / memory caps.

Current Limitations

v1 does not use Docker. It uses cwd validation, subprocess timeouts, and POSIX resource limits.
Resource limits require a POSIX platform that supports resource.setrlimit.
Jest execution expects Node.js plus project-local or npx-resolvable Jest.
Jest single-test targeting uses --testNamePattern; it does not parse Jest file-specific node ids.
Coverage summary is pytest-only in v1.
Tools return raw command output for execution; call parse_test_output to normalize framework JSON.

Local Development

Install dependencies:

bash

uv sync --extra dev

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:

bash

uv run mcp-test-runner

Run verification:

bash

uv run ruff check .
uv run mypy
uv run pytest

License

MIT

Related MCP Servers

View all in Developer Tools View all alternatives

Frequently Asked Questions about MCP Test Runner

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mcp-test-runner": { "command": "npx", "args": ["-y", "MCP Test Runner"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/mcp-test-runner?style=directory)](https://allmcps.com/mcp/mcp-test-runner)

HTML Embed

<a href="https://allmcps.com/mcp/mcp-test-runner"><img src="https://allmcps.com/api/badge/mcp-test-runner?style=directory" alt="MCP Test Runner on AllMCPs" /></a>

Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

★ Featured

AllMCPs Server

Explore Server →

Own this project?

This directory is pre-filled from public sources. Claim via GitHub README, site badge, or DNS TXT to get the verified badge and attach your website.

Free dofollow backlink: after claiming, verify your product site and place a dofollow AllMCPs badge — we recheck it stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to MCP Test Runner →Install in Claude Desktop Install in Cursor Install in VS Code