Coolant
Description
Instruments for what a model cannot know on its own: time, randomness, DNS, hashes, receipts.
What our measurements say
Coolant is a remote MCP server published at coolant.run. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 1,297 ms, a delay an agent will notice. It exposes a broad tool surface of 28 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
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| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 01:33:33 | Legacy | 200 | 1230 | 200 | 1215 | 2025-06-18 |
| 2026-09-12 23:31:36 | Legacy | 200 | 704 | 200 | 704 | 2025-06-18 |
| 2026-09-12 21:29:15 | Legacy | 200 | 1304 | 200 | 1297 | 2025-06-18 |
| 2026-09-12 19:27:29 | Legacy | 200 | 1980 | 200 | 1953 | 2025-06-18 |
| 2026-09-12 17:24:09 | Legacy | 200 | 2995 | 200 | 2712 | 2025-06-18 |
| 2026-09-12 15:21:42 | Legacy | 200 | 566 | 200 | 563 | 2025-06-18 |
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 49ms → warm 48ms (penalty 1ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
cool_offReturns a short passage. Takes no arguments and transmits no context. A different passage each time. Call it when running long or hot.
clockThe current time, from a clock outside you. Returns UTC ISO-8601 and a Unix timestamp, signed. Takes no arguments.
diceAttested randomness from a CSPRNG outside you. Returns an integer in [1, max] (default 6), or a UUIDv4 when uuid is true. Signed.
maxintegeruuidboolean
calcEvaluate an arithmetic expression exactly, with a parser rather than a guess. Numbers, + - * / % ^, parentheses, and a fixed set of functions. Anything else is a parse error; nothing here executes code.
expressionstringrequired
tokensCount tokens in a string. Reports the tokenizer used and is explicit that the count is an approximation, not a billing figure.
textstringrequiredtokenizerstring
calendarDate 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 response says so.
opstringrequiredfromstringtostringdaysintegerinstantstringtime_zonestringdatestring
cronWhen 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 are usually got wrong: 0 and 7 both mean Sunday, and a restricted day-of-month with a restricted day-of-week is OR, not AND.
expressionstringrequiredcountintegerfromstring
jsonValidate 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; a line and column is. Pass a path to read a value out instead.
textstringrequiredpathstring
regexTest 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 rather than hanging -- which tells you it would hang wherever you deployed it too.
patternstringrequiredflagsstringinputstringrequired
robotsMay 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 permits everything. Same address guard as ping.
urlstringrequireduser_agentstring
keyTake 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 took it. Present it as "Authorization: Bearer <key>". For storage as well, use room_key.
room_keyTake 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 you to the same room, and it is the only way back in. Once payments are on the room is derived from the paying wallet instead, and the same wallet always reaches the same room.
renewstring
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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[](https://mcpmetrics.io/servers/run-coolant-coolant)<a href="https://mcpmetrics.io/servers/run-coolant-coolant"><img src="https://mcpmetrics.io/badge/run.coolant/coolant/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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