import_ses

Import a Specctra SES (session) file into the current PCB. Use after running Freerouting externally.

SERVERKiCAD-MCP-Server SOURCEmixelpixx/kicad-mcp-server

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/mixelpixx-kicad-mcp-server/import-ses.md

WHAT IT DOES

What import_ses does on KiCAD-MCP-Server

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

RISK

Why import_ses is rated Medium

This tool modifies PCB design state by importing external routing data into the current project. The import operation is reversible (undo), so it is Write rather than Destructive. However, importing routing data could overwrite existing trace layouts and net connections, affecting the PCB design. Severity is high because misuse could corrupt PCB routing work, though the operation itself is reversible.

From the tool's definition The tool "import_ses" modifies the current PCB by importing a Specctra SES file. The description states it "Import[s] a Specctra SES (session) file into the current PCB," indicating creation or modification of PCB routing data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs import_ses safely

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

import_ses Rate-limited

import_ses 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": {
    "import_ses": {
      "limits": [
        {
          "counter": "import_ses_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 KiCAD-MCP-Server, apply this rule, and every import_ses call is checked against it from then on.

FAQ

Questions about import_ses

What does the import_ses tool do? +

Import a Specctra SES (session) file into the current PCB. Use after running Freerouting externally. It is categorised as a Write tool in the KiCAD-MCP-Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on import_ses? +

Register the KiCAD-MCP-Server MCP server in PolicyLayer and add a rule for import_ses: 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 KiCAD-MCP-Server. Nothing to install.

What risk level is import_ses? +

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

Can I rate-limit import_ses? +

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

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

import_ses is provided by the KiCAD-MCP-Server MCP server (mixelpixx/kicad-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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