AI agents call get_symbol_instances to retrieve information from Kicad without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'get_' prefix combined with 'symbol_instances' indicates a query or retrieval operation that returns existing symbol data from KiCad schematics without modifying state. Although the description is empty, the naming convention and position among predominantly write-focused sibling tools (add_copper_zone, add_label, etc.) strongly suggests this retrieves symbol instance information.
From the tool's definition Tool name 'get_symbol_instances' uses the 'get_' prefix, which is a standard read operation. Context from server description indicates this is part of KiCad schematic automation for 'read/write, analysis' capabilities.
Attacks that exploit this kind of access
get_symbol_instances. It is categorised as a Read tool in the Kicad MCP Server, which means it retrieves data without modifying state.
Register the Kicad MCP server in PolicyLayer and add a rule for get_symbol_instances: 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. Nothing to install.
get_symbol_instances is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_symbol_instances 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.
Set action: deny in the PolicyLayer policy for get_symbol_instances. 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.
get_symbol_instances is provided by the Kicad MCP server (productofamerica/mcp-server-kicad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →