{
  "markdown": "# validar-semver\n\n[![validar-semver MCP server](https://glama.ai/mcp/servers/encodi/validar-semver/badges/score.svg)](https://glama.ai/mcp/servers/encodi/validar-semver)\n\nRemote MCP server (Cloudflare Workers) with one tool that resolves real semver range satisfaction:\n\n- **`validate_semver`** — evaluates a version (e.g. `1.2.3`) against a list of ranges (`^1.2.3`, `~2.0`, `2.x`, `>=1.0.0 <2.0.0`, ...) using the same semver engine npm uses ([`semver`](https://www.npmjs.com/package/semver)), not a model guess about what should match.\n\nNo database, no persistent state: each call builds a fresh `McpServer` (see `createServer()` in `src/index.ts`) and is self-contained.\n\n## Billing (x402)\n\nCharges per call via [x402](https://x402.org) — real USDC payment on **Base mainnet**, against the Coinbase Developer Platform (CDP) facilitator. The payment travels inside the MCP JSON-RPC itself (`_meta`), not as an HTTP header; see `src/payments.ts`.\n\n| Tool | Price |\n|---|---|\n| `validate_semver` | $0.01 USDC |\n\nAn unpaid `tools/call` returns `isError: true` with the `accepts` (network, amount, `payTo`) the client needs to pay and retry — not an unexplained exception.\n\n## Structure\n\n```\nsrc/\n  index.ts        # registers the tool in the McpServer and exposes the MCP HTTP handler\n  payments.ts     # x402 billing on Base mainnet via the CDP facilitator\n  tools/\n    semver.ts       # pure logic for validate_semver (testable without Workers)\n    semver.test.ts\nscripts/\n  dev-node.ts     # dev server that runs the handler in plain Node, no wrangler\n```\n\n## Running it locally\n\n⚠️ **Note on `wrangler dev`**: the real Cloudflare Workers runtime (`workerd`) requires **macOS 13.5+**. If your Mac has an older version, `wrangler dev` (and `npm run dev`) will fail. This project includes a plain-Node shim that runs the exact same `fetch()` handler without needing `workerd`.\n\n### 1. Install dependencies\n\n```bash\nnpm install\n```\n\n### 2. Run the unit tests\n\n```bash\nnpm test\n```\n\n### 3a. If your wrangler dev works (macOS 13.5+, Linux, Windows)\n\n```bash\nnpm run dev\n```\n\n### 3b. If `wrangler dev` fails because of the macOS version\n\n```bash\nnpm run dev:node\n```\n\nStarts at `http://localhost:8787/mcp`, reading CDP credentials from `~/.mcp-tools-factory-credentials.env` (shared across all tools in this factory).\n\n### 4. Test with curl\n\n```bash\n# 1) initialize\ncurl -s -X POST http://localhost:8787/mcp \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Accept: application/json, text/event-stream\" \\\n  -d '{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-06-18\",\"capabilities\":{},\"clientInfo\":{\"name\":\"curl-test\",\"version\":\"0.0.1\"}}}'\n\n# 2) tools/list\ncurl -s -X POST http://localhost:8787/mcp \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Accept: application/json, text/event-stream\" \\\n  -d '{\"jsonrpc\":\"2.0\",\"id\":2,\"method\":\"tools/list\",\"params\":{}}'\n\n# 3) tools/call — validate_semver\ncurl -s -X POST http://localhost:8787/mcp \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Accept: application/json, text/event-stream\" \\\n  -d '{\"jsonrpc\":\"2.0\",\"id\":3,\"method\":\"tools/call\",\"params\":{\"name\":\"validate_semver\",\"arguments\":{\"version\":\"1.2.3\",\"ranges\":[\"^1.2.3\",\"^1.3.0\",\"~1.2.0\",\"2.x\"]}}}'\n```\n\nResponses come as Server-Sent Events (`event: message` + `data: {...}`); the `data:` line is the usual JSON-RPC response.\n\n## Deploy and listings\n\nDeployed at `https://validar-semver.encodari.workers.dev/mcp` (Cloudflare Workers). Published on the [official MCP registry](https://registry.modelcontextprotocol.io), [Smithery](https://smithery.ai), [mcp.so](https://mcp.so), and with an open PR to [awesome-mcp-servers](https://github.com/punkpeye/awesome-mcp-servers).\n\n## What it doesn't do (yet)\n\n- Charges on Base mainnet with real money. To switch back to testnet (Base Sepolia, `eip155:84532`) during development, change `NETWORK` in `src/payments.ts`.\n- No database or persistent state between calls (beyond the billing config, cached in memory per isolate — see `src/payments.ts`).\n",
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