MCP server.json Validator & Skeleton Generator

Validate an MCP server.json against the 2025-12-11 generic schema and the official MCP Registry publishing rules — reverse-DNS namespace, the _meta 4 KB publisher cap, allowlisted registry base URLs, and the MCPB fileSha256 requirement — then generate a compliant skeleton for an npm, PyPI, OCI, MCPB, or remote server. Everything runs locally; nothing is published or transmitted.

⚠ The MCP Registry and server.json schema are in preview and may change or reset. Rules embedded here track schema 2025-12-11. Re-verify against the live registry docs before publishing.

MCP Registry server.json 2025-12-11 Zero PII Client-Side · No Network

Scope & reliance — 🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only. This validator checks structure, schema shape, and registry-publishing constraints only — it does not contact the registry, npm, or PyPI, and cannot confirm that a package actually exists or that you own a namespace. Embedded rules are static and may age. Deterministic logic · no inference · zero PII · CC BY 4.0.

▸ server.json (JSON)

Paste your server.json. A deliberately-incomplete example is pre-loaded so you can see findings immediately.

▸ Skeleton Generator

Pick a distribution type and generate a compliant server.json scaffold you can fill in.