Mcpplay
The FastAPI /docs experience, for MCP servers.
Install
$ agentstack add mcp-gauthierpiarrette-mcpplay ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/mcp-gauthierpiarrette-mcpplay) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
mcpplay
The FastAPI /docs experience, for MCP servers.
Documentation • Getting Started • Issues
⚡ Run your MCP server → instantly get an interactive UI.
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 demoYour 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 serverFeatures
- 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
Source & license
This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: gauthierpiarrette
- Source: gauthierpiarrette/mcpplay
- License: Apache-2.0
- Homepage: https://mcpplay.dev
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.