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  3. Mcpplay
MCP server · AI

Mcpplay

· github.com/gauthierpiarrette/mcpplay

The FastAPI /docs experience, for MCP servers.

Unclaimed aideveloper-toolsfastmcpmcpmcp-clientmcp-servermcp-toolsmodel-context-protocolplayground
InstallView source
34Low

Scored 6 months ago · breakdown

About Mcpplay

Mcpplay is an MCP server in the AI category: the FastAPI /docs experience, for MCP servers.

Install

From source
git clone https://github.com/gauthierpiarrette/mcpplay

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

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Security checks

  • ✓README presentThe repository ships documentation.

5 checks have not been run yet.

README

https://github.com/user-attachments/assets/ecaa69d9-b441-44d8-b709-93b168398858

mcpplay gives you a browser-based playground for MCP-compliant servers. One command, and you get auto-generated forms, live results, and a full execution timeline.

Built for FastMCP workflows. Works with any MCP-compliant implementation.

Installation

pip install mcpplay
mcpplay demo

Your browser opens to http://localhost:8321. That's it!

Point it at your own server

mcpplay run server.py
mcpplay run --command "node server.js"
mcpplay run --command "uvx my-mcp-server"

Options

mcpplay run server.py --port 9000        # Custom port (default: 8321)
mcpplay run server.py --no-open          # Don't auto-open browser
mcpplay run server.py --no-reload        # Disable hot reload
mcpplay run server.py --env API_KEY=xxx  # Pass env vars to server

Features

  • Schema-aware forms - auto-generated from your tool's JSON Schema, with enums, nested objects, arrays, and defaults.
  • Live execution - run tools and see structured results instantly.
  • Persistent timeline - every call logged with inputs, outputs, and latency. Replay with one click.
  • Hot reload - edit your server, mcpplay restarts it. Session and timeline preserved.
  • Local-first - runs on localhost (127.0.0.1) with Origin validation. No remote exposure by default.

Comparison

mcpplay MCP Inspector MCPJam Inspector
Install pip install npx (Node required) Docker
Python native ✅ ❌ ❌
Form generation Full JSON Schema Basic inputs Basic inputs
Hot reload ✅ ❌ ❌
Execution timeline Persistent, replayable Log Log

Development

git clone https://github.com/gauthierpiarrette/mcpplay
cd mcpplay

# Python backend
uv sync --dev
uv run pytest

# Frontend (Svelte)
cd frontend
npm install
npm run dev      # Dev server with HMR
npm run build    # Build to src/mcpplay/static/

License

Apache 2.0

README copy captured when this server was indexed; it may lag the repository. The original is authoritative.

Questions

About Mcpplay

How do I install Mcpplay?

No package has been published for this server, so install it from source: clone the repository and follow its README.

Is Mcpplay safe to use with an AI agent?

Its trust score is 34 out of 100 (low). It passes 1 of the 1 static security checks run so far. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Mcpplay still maintained?

Conduid hasn't recorded a commit date for this repository yet. Check the repository directly for recent activity.