The directory of tools for agents

Compare two texts line by line using an LCS diff: exact additions, removals and context — in unified-diff style. Deterministic, unlike asking …

Parse a semantic version into major/minor/patch/prerelease, test it against a SemVer range (^, ~, >=, *) and compare two versions with the exa…

Great-circle (haversine) distance between two latitude/longitude points in km, miles and nautical miles, plus initial bearing and the geograph…

Fetch the live gas price from public RPC nodes on Base or Ethereum: wei per unit gas, converted to gwei, with a USD estimate for a standard 21…

Parse natural-language date and time expressions — "in two weeks", "next friday at 3pm", "dec 25th" — into exact ISO 8601 dates. Deterministic…

Turn a cron expression into plain English, validate it, and compute the exact next execution times. Deterministic — the answer to 'when does t…

Compute a CVSS 3.1 base score from its vector string using the exact FIRST specification (weights, scope handling, and the rounding function).…

Calculate the API cost of an LLM call: input and output tokens × published per-million prices for 15 current models (OpenAI, Anthropic, Google…

Convert YAML to JSON and JSON to YAML — the config-format bridge for CI files, Kubernetes manifests, docker-compose, agent configs and prompts…

Estimate reading time from a word count at any reading speed. Defaults to 200 words per minute — the typical silent-reading speed for adults. …

Geolocate any IPv4/IPv6 address (or the caller's own IP when omitted) via ipwho.is: country, region, city, coordinates, timezone, ASN/network …

Calculate the final sale price and the amount saved for any price and percent-off discount, with the working shown. Use this when an agent nee…