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Policylayer MCP Registry

@PolicyLayer

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About Policylayer MCP Registry

The MCP server that vets MCP servers. Connect your agent to the PolicyLayer registry and check any MCP server's identity, risk grade, auth posture and tool classifications before installing it. Free single-server lookups over 32,500+ published servers and 515,000+ classified tool

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "policylayer": {
      "url": "https://api.policylayer.com/mcp"
    }
  }
}

Tools

5

Check an MCP server against the PolicyLayer registry BEFORE installing or allowing it. Accepts a registry slug, an npm package name (scoped or not), a remote server URL (https://…), or a server name. Returns the full published record: identity verification with its evidence, risk grade, auth posture, freshness, and the tool surface listed riskiest-first. A server the registry does not know is queued for scanning by this very call — check back shortly.

Check a whole MCP stack against the PolicyLayer registry in one call — up to 25 servers, each given as candidate identifiers (npm package name, registry slug, or remote URL) tried in order until one resolves. Returns the published record for every hit — plus a deterministic verdict (attention signals and a suggested action) — and the lookup status for every miss; counts, grades and flagged tools come from the published records only. Costs one rate-limit unit per server.

Search the PolicyLayer registry of published MCP servers by name, slug or package substring. Returns candidate matches with risk grade, identity confidence (verified / unverified / mismatch — mismatch means it claims to be an official server with no verifiable link to the brand) and tool count — follow up with check_mcp_server on the match you meant.

One tool's full risk classification on a published MCP server: category, severity, risk analysis and evidence, OWASP classes, parameter schema and the recommended policy default. Use when deciding whether to allow a specific tool call, e.g. "should execute_sql on this server be permitted?"

The registry change feed: tool-surface drift, auth-posture flips, impostor flags, version bumps — every event the freshness watchers emit, id-cursored so a consumer resumes exactly where it stopped. Requires a Registry Licence key (Authorization: Bearer plr_...); self-serve at https://policylayer.com/registry/pricing.

Overview

What is Policylayer MCP Registry?

Policylayer MCP Registry is a hosted MCP server that vets any MCP server by returning its published safety record: verified identity, A–F risk grade, auth posture, and a risk classification for every tool. It covers 32,500+ published servers and 515,000+ classified tools via continuous scanning.

How to use Policylayer MCP Registry?

Connect your agent to the streamable HTTP endpoint (https://api.policylayer.com/mcp) using Claude Code (claude mcp add --transport http policylayer https://api.policylayer.com/mcp) or configure it in Claude Desktop, Cursor, Windsurf, or VS Code as a custom MCP connector. Then instruct your agent to check any server against PolicyLayer before installing. Free single-server lookups require no key.

Key features of Policylayer MCP Registry

  • Free single-server lookups without an API key
  • Full registry record: identity, risk grade, posture, and tool classifications
  • Continuous scanning keeps 32,500+ servers and 515,000+ tools current
  • Tools classify severity, OWASP categories, and recommend a policy action
  • get_change_events feed (with licence) reports drifts, posture flips, and impostor flags

Use cases of Policylayer MCP Registry

  • Vet an MCP server before installing it in your agent
  • Search the registry for a verified server by name or package
  • Check a specific tool’s risk classification and recommended policy
  • Monitor changes to servers you depend on (with a licence key)

FAQ from Policylayer MCP Registry

What is the endpoint for Policylayer MCP Registry?

The endpoint is https://api.policylayer.com/mcp (Streamable HTTP).

Do I need an API key to use Policylayer MCP Registry?

No. All single-server lookups (via check_mcp_server, search_registry, check_tool) are free and require no key. A Registry Licence key is needed only for the get_change_events tool.

How many servers does Policylayer MCP Registry cover?

The registry includes 32,500+ published servers and 515,000+ classified tools, kept current by continuous scanning.

How do I add a licence key for Policylayer MCP Registry?

For Claude Code, append --header "Authorization: Bearer plr_..." to the add command. For Cursor/Windsurf/VS Code, add "headers": { "Authorization": "Bearer plr_..." } inside the server entry. Claude desktop/web connectors cannot send headers, so only free lookups are available.

What tools are available in Policylayer MCP Registry?

Four tools: check_mcp_server (full record for one server), search_registry (search servers by name), check_tool (classification for one tool), and get_change_events (change feed, needs licence). The first three are free.

Frequently asked questions

What is the endpoint for Policylayer MCP Registry?

The endpoint is `https://api.policylayer.com/mcp` (Streamable HTTP).

Do I need an API key to use Policylayer MCP Registry?

No. All single-server lookups (via `check_mcp_server`, `search_registry`, `check_tool`) are free and require no key. A Registry Licence key is needed only for the `get_change_events` tool.

How many servers does Policylayer MCP Registry cover?

The registry includes 32,500+ published servers and 515,000+ classified tools, kept current by continuous scanning.

How do I add a licence key for Policylayer MCP Registry?

For Claude Code, append `--header "Authorization: Bearer plr_..."` to the add command. For Cursor/Windsurf/VS Code, add `"headers": { "Authorization": "Bearer plr_..." }` inside the server entry. Claude desktop/web connectors cannot send headers, so only free lookups are available.

What tools are available in Policylayer MCP Registry?

Four tools: `check_mcp_server` (full record for one server), `search_registry` (search servers by name), `check_tool` (classification for one tool), and `get_change_events` (change feed, needs licence). The first three are free.

Comments

Basic information

License

MIT

Transports

stdio

Author

PolicyLayer

Submitted by

Liad Shababo

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