The directory of tools for agents

Parse a User-Agent header into structured data: browser (name/version), rendering engine, operating system, and device type/vendor/model. Dete…

Build a keccak-256 sorted-pair merkle tree (OpenZeppelin convention) from a list of leaves and get the root plus a verification proof for any …

Estimate how many tokens a text consumes for each major model family (GPT, Claude, Gemini, Llama, DeepSeek) using a character/word heuristic t…

Full registration record for a domain via RDAP (the modern WHOIS): registrar, creation/expiration/last-updated dates with days-to-expiry, name…

Calculate a person's exact age in calendar years, months and days from their date of birth, plus total days lived. Reference date defaults to …

Fetch a URL server-side and extract its title, meta description, Open Graph and Twitter card tags, canonical URL and favicon — the data agents…

Compute sunrise, sunset, solar noon, civil dawn/dusk, golden hours and day length for any latitude/longitude and date — with the exact NOAA so…

Query the MX records for any domain via DNS-over-HTTPS: every mail exchanger with its priority, sorted so the primary (lowest number) comes fi…

Parse a URL into all its components: protocol, hostname, port, path segments, query parameters (as a clean object), hash and credentials. Exac…

Convert between metric and imperial length units: kilometers, meters, centimeters, millimeters, micrometers, nanometers, miles, yards, feet, i…

Fast TLS certificate expiry check: days remaining, issuer, validity window and an expired/expiring-soon flag, read live from a TLS handshake. …

Fetch an RSS or Atom feed and return normalized JSON items: title, link, publication date (ISO) and summary. Server-side fetching with SSRF gu…