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MCP verified MIT Self-run

Webmcp Sh

mcp-webmcp-org-webmcp-sh · by WebMCP-org

A modern web-based Model Context Protocol (MCP) playground for testing and developing MCP servers and clients

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Install

$ agentstack add mcp-webmcp-org-webmcp-sh

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No 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 Used
  • ✓ 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.

View the full security report →

Verified badge

Passed review? Show it. Paste this badge into your README, it links to the public security report.

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[![AgentStack Verified](https://agentstack.voostack.com/badges/verified.svg)](https://agentstack.voostack.com/security/report/mcp-webmcp-org-webmcp-sh)

Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude DesktopCursorWindsurf

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

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 →
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About

WebMCP.sh

Web-based MCP playground with in-browser PostgreSQL

[](./LICENSE) [](https://www.typescriptlang.org) [](https://react.dev)

[Quick Start](#quick-start) • [Features](#features) • [Tech Stack](#tech-stack) • [Contributing](#contributing)

Try It Live

Live Demo: webmcp.sh

What is WebMCP?

WebMCP is a draft proposal currently being incubated by the W3C Web Machine Learning Community Group. It enables websites to expose AI-callable tools through the browser's navigator.modelContext API, allowing AI agents to interact with web applications directly.

WebMCP.sh is a development playground demonstrating these capabilities with an in-browser PostgreSQL database (PGlite).

The Ecosystem

  • WebMCP - The W3C Web Model Context API standard for exposing website tools to AI agents
  • MCP-B - The reference implementation that polyfills navigator.modelContext and bridges WebMCP with MCP
  • Char - MCP-B's in-page AI agent that interacts with WebMCP-enabled websites

Key Capabilities

  • Connect to multiple MCP servers simultaneously
  • Execute tools with real-time parameter validation
  • Browse and manage server resources
  • In-browser PostgreSQL database (PGlite) for persistence
  • Interactive SQL REPL for database exploration

Quick Start

# Clone and install
git clone https://github.com/WebMCP-org/webmcp-sh.git
cd webmcp-sh
pnpm install

# Start development server
pnpm dev

Open http://localhost:5173

Requirements

  • Node.js 18+
  • pnpm 9+

Features

MCP Integration

  • Multi-server connections - Connect to multiple MCP servers via WebSocket
  • Tool execution - Run server tools with schema validation
  • Resource browser - Explore and manage server resources
  • Prompt templates - Create and reuse common prompts

In-Browser Database

  • PGlite - Full PostgreSQL running in the browser via WASM
  • Drizzle ORM - Type-safe database operations
  • SQL REPL - Interactive query interface with autocomplete
  • IndexedDB persistence - Data survives browser sessions

Developer Experience

  • Dark mode - Comfortable viewing in any lighting
  • Real-time updates - Live connection status and streaming
  • Debug mode - Detailed logging for troubleshooting

Tech Stack

| Category | Technology | |----------|------------| | Frontend | React 19, TypeScript 5.8, Vite 7 | | Styling | Tailwind CSS 4, shadcn/ui | | Database | PGlite, Drizzle ORM | | Testing | Playwright | | Deployment | Cloudflare Workers |

Commands

# Development
pnpm dev              # Start dev server
pnpm build            # Build for production
pnpm preview          # Preview production build

# Code Quality
pnpm lint             # Run ESLint
pnpm check            # Typecheck + build + dry-run deploy

# Database
pnpm db:generate      # Generate migrations
pnpm db:studio        # Open Drizzle Studio

# Testing
pnpm test             # Run E2E tests
pnpm test:ui          # Interactive Playwright UI

Project Structure

src/
├── react-app/
│   ├── components/   # UI components
│   ├── hooks/        # React hooks (MCP tools, etc.)
│   ├── lib/
│   │   ├── db/       # PGlite + Drizzle database
│   │   └── webmcp/   # WebMCP client library
│   └── routes/       # Application routes
└── worker/           # Cloudflare Worker

Deployment

Cloudflare Workers

pnpm build
pnpm deploy

Contributing

See [CONTRIBUTING.md](./CONTRIBUTING.md) for development standards.

Resources

WebMCP & MCP-B

Model Context Protocol

Technologies

License

MIT License - see [LICENSE](./LICENSE) for details.

Website: webmcp.sh • GitHub: WebMCP-org/webmcp-sh

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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