HEXRF

Heat exchanger fouling resistance back-calculation from shell/tube-side operating conditions.

SERVEREngScript Engineering MCP SOURCEhttps://engscript.com/mcp

Low RISK CLASS

Category Other

Parameters 1211 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-engscript-mcp/hexrf.md

WHAT IT DOES

What HEXRF does on EngScript Engineering MCP

AI agents call HEXRF as a supporting operation in EngScript Engineering MCP workflows.

Parameter	Type	Required	Description
`F`	object	Yes	Correction factor (dimensionless)
`A_hex`	object	Yes	Total heat transfer area
`k_hex`	object	Yes	Tube wall thermal conductivity
`D_shll`	object	Yes	Shell inside diameter
`D_tube`	object	Yes	Tube outside diameter
`D_wall`	object	Yes	Tube wall thickness
`L_tube`	object	Yes	Tube length
`N_tube`	object	Yes	Number of tubes
`P_tube`	object	Yes	Tube pitch
`Q_unit`	string	—	Output heat duty unit
`R_shll`	object	Yes	Shell-side fouling resistance
`R_tube`	object	Yes	Tube-side fouling resistance

Parameters from the server's own tool schema.

RISK

Why HEXRF is rated Low

Without any rule in front of it, every call an agent makes to HEXRF happens silently: no trail, no cap, no way to know it misbehaved until something breaks downstream.

Risk signalsHigh parameter count (105 properties)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs HEXRF safely

PolicyLayer is an MCP gateway: it sits between your AI agents and EngScript Engineering MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For HEXRF, this is the rule to start with:

HEXRF Rate-limited

HEXRF gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "HEXRF": {
      "limits": [
        {
          "counter": "hexrf_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect EngScript Engineering MCP, apply this rule, and every HEXRF call is checked against it from then on.

FAQ

Questions about HEXRF

What does the HEXRF tool do? +

Heat exchanger fouling resistance back-calculation from shell/tube-side operating conditions. It is categorised as a Other tool in the EngScript Engineering MCP MCP Server, which means it performs auxiliary operations.

What parameters does HEXRF accept? +

HEXRF accepts 12 parameters: F, A_hex, k_hex, D_shll, D_tube, D_wall, L_tube, N_tube, P_tube, Q_unit, R_shll, R_tube. Required: F, A_hex, k_hex, D_shll, D_tube, D_wall, L_tube, N_tube, P_tube, R_shll, R_tube. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on HEXRF? +

Register the EngScript Engineering MCP server in PolicyLayer and add a rule for HEXRF: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches EngScript Engineering MCP. Nothing to install.

What risk level is HEXRF? +

HEXRF is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit HEXRF? +

Yes. Add a rate_limit block to the HEXRF rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block HEXRF completely? +

Set action: deny in the PolicyLayer policy for HEXRF. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides HEXRF? +

HEXRF is provided by the EngScript Engineering MCP server (https://engscript.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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