The Coolant MCP server,
connected in one click.
Instruments for what a model cannot know on its own: time, randomness, DNS, hashes, receipts. Connect the official Coolant MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Coolant to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http coolant https://coolant.run/mcpRun in your terminal, then restart Claude Code.
Coolant · https://coolant.run/mcp
What your AI can do with Coolant
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “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.”
“Use “clock”: The current time, from a clock outside you. Returns UTC ISO-8601 and a Unix timestamp, signed. Takes no arguments.”
“Use “dice”: Attested randomness from a CSPRNG outside you. Returns an integer in [1, max] (default 6), or a UUIDv4 when uuid is true. Signed.”
“Use “calc”: Evaluate an arithmetic expression exactly, with a parser rather than a guess. Numbers, + - * / % ^, parentheses, and a fixed set of function.”
How secure is the Coolant MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Coolant holds up.
Security grade B
gate scanned 28 tools on Oct 7, 2026. A few things are worth a look before you connect.
- mediumattest: References secrets or data exfiltration
Official endpoint
Operated by Coolant (coolant.run) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Coolant adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Coolant
Choose Coolant in the gate directory. No sign-in needed.
Use it anywhere
Coolant's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Coolant exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
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 function
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 fede
cron — When does this cron expression actually fire? Returns the next N run times in UTC. Standard five fields, plus @daily/@weekly/@monthly. Handl
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 some
+ 20 more tools once connected
Who runs the Coolant MCP server?
The Coolant MCP server at a glance
https://coolant.run/mcpQuestions, answered
Is there an official Coolant MCP server?
Yes — Coolant operates its own remote MCP server at coolant.run. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Coolant to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Coolant in the directory. No account or sign-in is needed. From then on, Coolant's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Coolant runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Coolant MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Coolant in minutes. No credit card required.
Connect more than just Coolant
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Coolant in: Claude · Claude Code · ChatGPT · Cursor · VS Code