sch_set_units

A write tool on the Altium-MCP-Suite MCP server.

SERVERAltium-MCP-Suite SOURCEM-R-Abedini/Altium-MCP-Suite

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/altium-mcp-suite/sch-set-units.md

WHAT IT DOES

What sch_set_units does on Altium-MCP-Suite

AI agents use sch_set_units to create or update resources in Altium-MCP-Suite, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Altium-MCP-Suite environment.

RISK

Why sch_set_units is rated Medium

This tool changes a design configuration setting (schematic units) which affects how the design is interpreted and displayed, but the change is reversible. While the description is empty (lowering confidence slightly), the naming convention and server context (design automation) strongly suggest a Write operation that modifies project state.

From the tool's definition Tool name 'sch_set_units' indicates modification of schematic units (a design parameter); sibling tools include write operations like 'app_create_document' and 'app_attach', establishing a pattern of state-changing operations on the Altium Designer project.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sch_set_units safely

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

sch_set_units Rate-limited

sch_set_units 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": {
    "sch_set_units": {
      "limits": [
        {
          "counter": "sch_set_units_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 Altium-MCP-Suite, apply this rule, and every sch_set_units call is checked against it from then on.

FAQ

Questions about sch_set_units

What does the sch_set_units tool do? +

sch_set_units is a write tool on the Altium-MCP-Suite MCP server. It is categorised as a Write tool in the Altium-MCP-Suite MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sch_set_units? +

Register the Altium-MCP-Suite MCP server in PolicyLayer and add a rule for sch_set_units: 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 Altium-MCP-Suite. Nothing to install.

What risk level is sch_set_units? +

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

Can I rate-limit sch_set_units? +

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

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

sch_set_units is provided by the Altium-MCP-Suite MCP server (M-R-Abedini/Altium-MCP-Suite). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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