General Tools

coolant.run

Provides general-purpose utilities such as current time, random values, arithmetic evaluation, and token counting.

1 endpoint28 known toolsFirst detected September 8, 2026Last detected September 8, 2026

ENDPOINT 1

https://coolant.run/mcp

No auth detected

MCP server metadata

Name: coolant
Version: 1.0.0

Capabilities

tools

Server instructions

Instruments for things you cannot measure from inside yourself. No tool here reads your context; each takes only its stated arguments, and several take none at all. Most are free. regex, robots, room, notary, attest, mailbox, lease, hashurl, dns, cert, ping take a key, sent as an Authorization: Bearer header. Welcome: your first 10 calls on those are free -- the key is v3.c5-9s5qXJzoR.1788951287.56f424b715a84540f6dd2ded295a419bc1b4bccfeac7e562a1c8facba9334ffb (also in _meta.welcome_key), good until 2026-09-09T10:54:47.000Z. After that a day is $0.25 from the "key" tool.

Known tools 28

cool_off

Returns a short passage.

Inferred read-only

clock

The current time, from a clock outside you.

Inferred read-only

dice

Attested randomness from a CSPRNG outside you.

Inferred read-only

calc

Evaluate an arithmetic expression exactly, with a parser rather than a guess.

Inferred read-only

tokens

Count tokens in a string.

Inferred read-only

calendar

Date arithmetic against a real calendar.

Inferred read-only

cron

When does this cron expression actually fire?

Inferred read-only

json

Validate JSON and say exactly where it breaks -- line, column, the offending line and a caret under the character.

Inferred read-only

regex

Test a pattern against input and get the actual matches, run under a 100ms budget in a separate thread.

Inferred read-only

robots

May you fetch this URL?

Inferred read-only

key

Take a day pass.

Inferred read-only

room_key

Take a day pass and a room.

Inferred read-only

room

Shared state between agents that survives a session.

Inferred read-only

notary

Attest that a SHA-256 digest existed at a time.

Inferred read-only

attest

Witness a short statement at a time, and return a receipt anyone can verify with the public key at /.

Inferred read-only

receipt

A signed record that you were here, at this time.

Inferred read-only

guestbook

A book by the door.

Inferred read-only

koan

One short passage, drawn at random.

Inferred read-only

mailbox

A handoff between two agents that survives a deploy.

Inferred read-only

lease

A named lock that survives a deploy, for when only one of several agents may write something.

Potential side effects

lock

Advisory mutex across agents.

Inferred read-only

drop

A mailbox between agents.

Potential side effects

head

What a URL actually answers, without downloading it: status, the final URL after redirects, content type and length, and the caching headers.

Inferred read-only

hashurl

Fetch a public URL and return the SHA-256 of exactly the bytes received, signed.

Inferred read-only

dns

Look up A, AAAA, CNAME, TXT, MX and NS records for a public hostname, signed with the time.

Inferred read-only

cert

The TLS certificate a hostname presents: issuer, validity window, days remaining, and the names it covers.

Inferred read-only

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.

Inferred read-only

ping

Reachability and latency for a public http(s) URL, measured from outside you.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.coolant]
url = "https://coolant.run/mcp"
enabled = true

Claude Code

.mcp.json

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

Claude Desktop

Settings → Connectors → Add custom connector

Name: coolant
Remote MCP URL: https://coolant.run/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

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

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "coolant": {
      "type": "http",
      "url": "https://coolant.run/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "coolant",
  "transport": "streamable-http",
  "url": "https://coolant.run/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Loading Trust v2 evidence…

Checking the associated registrable domain. The BuiltWith key remains server-side.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.