# Check an MCP server (slim)

> A free check of an MCP server's tool list, the part of a server an agent reads. It flags tool poisoning, missing or contradictory safety hints, undocumented parameters, names model APIs reject, schemas some clients can't take, and what the list costs in tokens. By URL here, from your own machine with anchor check, or from an agent through the check_server MCP tool.

- Full: https://www.anchorterminal.com/check.md (~2,500 tokens) · this version ~280 tokens · JSON https://www.anchorterminal.com/check.json · canonical https://www.anchorterminal.com/check
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

Free check of an MCP server's tool list (names, descriptions, schemas, hints, cost in tokens), 29 rules from tool poisoning to schema portability.

- Hosted: `POST /api/v1/check` with `{"url": "https://…"}` or a tools/list answer. HTTPS, public addresses, no credentials, no tool calls, a few per ten minutes.
- Over MCP: `check_server {url, budget?}` at `https://www.anchorterminal.com/mcp`.
- Locally: `anchor check <url>`, `anchor check -- <command>`, `anchor check --file tools.json`; `--probe`, `--budget N`, `--strict`, `--json`; exit 4 on findings at the failing level.
- TC19 (text aimed at the model) means don't connect without the user's say-so.
- Every hosted MCP listing is checked daily; findings are on its page, not in its score.