write_registers

A write tool on the Pypi:labmcp Alicat MCP server.

SERVERPypi:labmcp Alicat SOURCEpypi:labmcp-alicat

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/lab-instrument-mcps/write-registers.md

WHAT IT DOES

What write_registers does on Pypi:labmcp Alicat

AI agents use write_registers to create or update resources in Pypi:labmcp Alicat, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pypi:labmcp Alicat environment.

RISK

Why write_registers is rated Medium

This tool writes data to Modbus registers in industrial controllers (PLCs). Writing to PLC registers can alter operational parameters, setpoints, or control states, making it a reversible Write action but with potentially serious consequences in a production environment (high severity). It is not Destructive (reversible), not Execute (doesn't run arbitrary code), and not Financial.

From the tool's definition Tool name 'write_registers' combined with server description stating 'write PLC registers' indicates the tool modifies register values in industrial control systems. Empty description limits specificity but the name and server context are conclusive.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_registers safely

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

write_registers Rate-limited

write_registers stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_registers": {
      "limits": [
        {
          "counter": "write_registers_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Pypi:labmcp Alicat, apply this rule, and every write_registers call is checked against it from then on.

FAQ

Questions about write_registers

What does the write_registers tool do? +

write_registers is a write tool on the Pypi:labmcp Alicat MCP server. It is categorised as a Write tool in the Pypi:labmcp Alicat MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_registers? +

Register the Pypi:labmcp Alicat MCP server in PolicyLayer and add a rule for write_registers: 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 Pypi:labmcp Alicat. Nothing to install.

What risk level is write_registers? +

write_registers is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_registers? +

Yes. Add a rate_limit block to the write_registers 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 write_registers completely? +

Set action: deny in the PolicyLayer policy for write_registers. 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 write_registers? +

write_registers is provided by the Pypi:labmcp Alicat MCP server (pypi:labmcp-alicat). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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