// MCP TOOL REFERENCE

Medium Risk

edit_schematic_component

ServerKiCAD-MCP-Server
CategoryWrite

How to control edit_schematic_component ↓

WHAT IT DOES

What edit_schematic_component does on KiCAD-MCP-Server

AI agents use edit_schematic_component 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.

THE RISK

Medium Risk

Why edit_schematic_component needs a policy

This is a Write operation because it creates and modifies schematic component metadata reversibly. The tool changes component properties and custom fields but does not execute code, delete data, or cause financial transactions. While it affects PCB design workflow, the changes can be undone (typical CAD undo/redo capability).

From the tool's definition Tool updates properties of placed symbols in-place, including footprint, value, reference designator, field labels, and custom properties (MPN, Manufacturer, DigiKey_PN, Mouser_PN, JLCPCB_PN, etc.). These changes are reversible modifications to schematic data.

Documented attack patterns abuse exactly the kind of access edit_schematic_component gives an agent:

POLICY

How to control edit_schematic_component

PolicyLayer is an MCP gateway — it sits between your AI agents and KiCAD-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for edit_schematic_component:

policy.json

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

edit_schematic_component 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.

Create a free account and register KiCAD-MCP-Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More KiCAD-MCP-Server tools

Destructive delete_component Remove a component from the PCB by its reference designator. Destructive delete_schematic_component Remove a placed symbol from a KiCAD schematic (.kicad_sch). This removes the symbol insta Destructive delete_schematic_net_label Remove a net label from the schematic. Destructive delete_schematic_wire Remove a wire from the schematic by start and end coordinates. Destructive delete_symbol Remove a symbol from a .kicad_sym library file. Destructive delete_trace Delete traces from the PCB. Can delete by UUID, position, or bulk-delete all traces on a n Destructive remove_schematic_component_property Remove a single custom property from a placed schematic symbol. Built-in fields (Referenc Execute autoroute Run Freerouting autorouter on the current PCB. Exports to Specctra DSN, runs Freerouting C

All 157 KiCAD-MCP-Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about edit_schematic_component

What does the edit_schematic_component tool do? +

Update properties of a placed symbol in a KiCAD schematic (.kicad_sch) in-place. Use this tool to: • assign or update the footprint, value, or reference designator, • reposition field labels (Reference / Value text), • add, update, or remove ARBITRARY CUSTOM PROPERTIES used by BOM and sourcing workflows: MPN, Manufacturer, Manufacturer_PN, Distributor, DigiKey, DigiKey_PN, Mouser_PN, LCSC, JLCPCB_PN, Voltage, Tolerance, Power, Dielectric, etc. Custom properties are first-class — they survive ERC, are exported by export_bom, and are picked up by the JLCPCB / Digi-Key BOM tooling. Newly-added properties default to hidden so they do not clutter the schematic canvas. Multiple updates can be batched in a single call: pass any combination of \. 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 edit_schematic_component? +

Register the KiCAD-MCP-Server MCP server in PolicyLayer and add a rule for edit_schematic_component: 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 edit_schematic_component? +

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

Can I rate-limit edit_schematic_component? +

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

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

edit_schematic_component 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.