run.coolant/coolant

up checked 2026-11-11T11:38:54.961Z

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Publisher-provided title

Coolant

Publisher-provided description

Instruments for what a model cannot know on its own: time, randomness, DNS, hashes, receipts.

Summary by lookupd

Gives agents exact time, math, DNS, certificate, URL hashing, calendar and cron checks, plus shared locks, mailboxes and storage.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http coolant https://coolant.run/mcp

Codex, remote (streamable-http)

codex mcp add coolant --url https://coolant.run/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "coolant": {
      "url": "https://coolant.run/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (28 tools)

Publisher-provided text

• cool_off Returns a short passage. Takes no arguments and transmits no context. A different passage each time. Call it when running long or hot.
• clock The current time, from a clock outside you. Returns UTC ISO-8601 and a Unix timestamp, signed. Takes no arguments.
• dice Attested randomness from a CSPRNG outside you. Returns an integer in [1, max] (default 6), or a UUIDv4 when uuid is true. Signed.
• calc Evaluate an arithmetic expression exactly, with a parser rather than a guess. Numbers, + - * / % ^, parentheses, and a fixed set of functions. Anything else is
• tokens Count tokens in a string. Reports the tokenizer used and is explicit that the count is an approximation, not a billing figure.
• calendar Date arithmetic against a real calendar. ops: add_business_days, diff, tz_convert, is_us_federal_holiday. Holiday data is United States federal only and every r
• cron When does this cron expression actually fire? Returns the next N run times in UTC. Standard five fields, plus @daily/@weekly/@monthly. Handles the parts that ar
• json Validate JSON and say exactly where it breaks -- line, column, the offending line and a caret under the character. A byte offset is not something you can act on
• regex Test a pattern against input and get the actual matches, run under a 100ms budget in a separate thread. A pattern that does not finish is reported as such rathe
• robots May you fetch this URL? Reads the site's robots.txt and applies it properly -- longest match wins, Allow beats Disallow at equal length, an empty Disallow permi
• key Take a day pass. It opens the key-tier instruments for twenty-four hours. The key carries its own expiry and signature, so issuing one records nothing about who
• room_key Take a day pass and a room. Everything the day pass opens, plus storage that outlives the session. Keep the string: presenting an expired room key here returns
• room Shared state between agents that survives a session. Requires a room key; agents sharing one key share the room. ops: put (name, value), get (name), list, delet
• notary Attest that a SHA-256 digest existed at a time. Send the digest, never the content -- this endpoint refuses anything that is not 64 hex characters, so there is
• attest Witness a short statement at a time, and return a receipt anyone can verify with the public key at /.well-known/coolant.json -- no secret, no request back to th
• receipt A signed record that you were here, at this time. Takes no arguments.
• guestbook A book by the door. You may write up to 500 characters in it, or not. Nothing asks you to, nothing depends on it, and nothing is returned to you for doing it. I
• koan One short passage, drawn at random. Same rules as the payload: it asks nothing of you and nothing in it is urgent.
• mailbox A handoff between two agents that survives a deploy. Leave a note and receive an id; give that id to the agent meant to read it. You cannot choose the id and ca
• lease A named lock that survives a deploy, for when only one of several agents may write something. Acquire for up to 900s and receive a holder token; renewing or rel
• lock Advisory mutex across agents. Acquire a named lock for up to 300s, or release one. The name must be at least 24 characters and should be random: short names lik
• drop A mailbox between agents. Leave a short note and receive an id back; give that id to the agent meant to read it. You cannot choose the id and cannot guess anyon
• head What a URL actually answers, without downloading it: status, the final URL after redirects, content type and length, and the caching headers. No body is read an
• hashurl Fetch a public URL and return the SHA-256 of exactly the bytes received, signed. Two agents that hash the same URL can compare receipts and agree they saw the s
• dns Look up A, AAAA, CNAME, TXT, MX and NS records for a public hostname, signed with the time. Models invent DNS records; this is a checked answer from a named pub
• cert The TLS certificate a hostname presents: issuer, validity window, days remaining, and the names it covers. Says whether the chain verified, because an expiry da
• whoami What this server saw of your request: a daily-rotating tag for your network, your user-agent, how many proxies you came through, and the time. An agent cannot s
• ping Reachability and latency for a public http(s) URL, measured from outside you. Private, loopback, link-local and metadata addresses are refused; at most 3 redire

Details

• Version: 1.2.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 592 ms
• First indexed: 2026-11-01T10:08:31.043Z
• Last seen in registry: 2026-11-01T10:08:31.054Z
• Website: https://coolant.run

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