{"name":"hmac","title":"HMAC Generator","category":"developer","description":"Compute an HMAC digest (SHA-256 by default) for a key–message pair.","price_usd":0.001,"input_schema":{"type":"object","properties":{"key":{"type":"string","description":"Secret key"},"message":{"type":"string","description":"Message to authenticate"},"algorithm":{"type":"string","description":"Hash","enum":["sha1","sha256","sha512","md5"]}},"additionalProperties":false,"required":["key","message"]}}