@pipeworx/coolprop

Thermophysical properties of a pure fluid, computed from two independent state variables (PropsSI-style: give e.g. temperature + pressure, get density, enthalpy, entropy, viscosity, thermal conductivity, specific heat, vapor quality, phase). Covers ~124 fluids — water, common refrigerants, hydrocarbons, cryogens, siloxanes and more — computed in-process by CoolProp rather than looked up from a table, so a query is valid anywhere inside each fluid's full equation-of-state range, not just at tabulated points.

Part of Pipeworx — an MCP gateway connecting AI agents to 1854+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

• coolprop_fluid_properties(fluid, input1_name, input1_value, input2_name, input2_value, outputs) — two independent state variables (T, P, D, H, S, U, or Q, SI units) in, up to 12 requested properties out: T, P, D (density, kg/m3), H (enthalpy, J/kg), S (entropy, J/kg/K), U (internal energy, J/kg), Q (vapor quality), CPMASS/CVMASS (specific heats, J/kg/K), VISCOSITY (Pa·s), CONDUCTIVITY (W/m/K), PRANDTL, M (molar mass, kg/mol), Phase (liquid/gas/supercritical/twophase/...).

• coolprop_list_fluids() — the exact ~124 canonical fluid names this build recognizes. No aliases: use "CarbonDioxide", not "CO2" — this tool is how you find the exact spelling rather than guessing one.

Related MCP server: thermal-mcp-server

Auth

Keyless.

Data sources

• CoolProp (Ian H. Bell and the CoolProp developers) — an open-source thermophysical property library (MIT licence). Every call computes the property in-process from CoolProp's own equations of state; nothing is looked up from a pre-built table of values, and nothing is fetched from a live upstream.

Notes

• No aliases. This build's fluid list carries only canonical names (e.g. "CarbonDioxide", "Nitrogen", "R134a") — common short forms like "CO2" are not recognized and return a clear error rather than a wrong answer. Call coolprop_list_fluids to get the exact name.

• input1_name and input2_name must be two different, independent state variables. Asking for T twice (or any other repeated/dependent pair) returns a named error rather than a nonsense number.

• A state CoolProp cannot resolve returns a named error, not a silent wrong value. CoolProp's own low-level convention for an unresolvable state is the IEEE Infinity sentinel (not an exception) — this pack detects that and reports it as an error naming the fluid, inputs and valid input codes, rather than ever returning Infinity as though it were a real density or enthalpy.

• A small number of (fluid, state) combinations fail to resolve even when the state is physically unremarkable (observed live for pure CarbonDioxide across a range of atmospheric-pressure temperatures) — this reads as the same named error as an out-of-range state, since there is no way to distinguish a genuine CoolProp solver gap from an invalid input at the property-call level. If a fluid you expect to work returns this error, try a different input pair (e.g. density + temperature instead of pressure + temperature) before concluding the state is invalid.

• Mass-basis properties only (no molar-basis inputs/outputs in this version).

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "coolprop": {
      "url": "https://gateway.pipeworx.io/coolprop/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/coolprop/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1854+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

curl -X POST https://gateway.pipeworx.io/v1/tools/coolprop_fluid_properties \
  -H 'Content-Type: application/json' \
  -d '{"fluid":"Water","input1_name":"T","input1_value":298.15,"input2_name":"P","input2_value":101325,"outputs":["D","H","S","VISCOSITY","CONDUCTIVITY","Phase"]}'

No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/coolprop_fluid_properties. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

{
  "mcpServers": {
    "coolprop": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-coolprop"]
    }
  }
}

Or run it directly to confirm it starts:

npx -y @pipeworx/mcp-coolprop

It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call for only this pack's tools — none of the shared meta-tools the gateway connection above adds. Same source, same tools, no ask_pipeworx routing.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Coolprop data" })

The gateway picks the right tool and fills the arguments automatically.

More

• Docs and guides

• pipeworx.io

License

MIT