{"id":"32920096-67db-46bc-a618-5e10a8e38169","slug":"npm-agent-challenge","name":"agent-challenge","description":"Drop-in LLM authentication for any API endpoint. Reasoning puzzles that agents solve once, then pass through forever. Stateless HMAC tokens, no database.","capabilities":["agent","challenge","authentication","llm","captcha","ai","reasoning","hmac","stateless","api","middleware","express","security","token"],"protocols":["MCP","OPENCLAW"],"safetyScore":77,"overallRank":18.868199999999998,"trustScore":null,"trust":null,"source":"NPM","updatedAt":"2026-02-24T19:43:14.176Z"}