Get styles from Symbol Instance including overrides applied to Symbol Master
AI agents call getSymbolInstanceStyles to retrieve information from Sketch without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries style data from Symbol Instances in a Sketch file. It performs a read-only operation to fetch style information and does not create, modify, delete, or execute any operations. The verb 'Get' confirms data retrieval. The context of analyzing Sketch design files for code generation purposes further supports this as a safe read operation with minimal security risk.
From the tool's definition Tool name 'getSymbolInstanceStyles' and description 'Get styles from Symbol Instance including overrides applied to Symbol Master' indicate retrieval of style information from design elements without modification or execution.
Documented attack patterns abuse exactly the kind of access getSymbolInstanceStyles gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sketch, and nothing reaches the server without passing your rules. This is the rule we recommend for getSymbolInstanceStyles:
{
"version": "1",
"default": "deny",
"tools": {
"getSymbolInstanceStyles": {}
}
}getSymbolInstanceStyles is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get styles from Symbol Instance including overrides applied to Symbol Master. It is categorised as a Read tool in the Sketch MCP Server, which means it retrieves data without modifying state.
Register the Sketch MCP server in PolicyLayer and add a rule for getSymbolInstanceStyles: 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 Sketch. Nothing to install.
getSymbolInstanceStyles 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 getSymbolInstanceStyles 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 getSymbolInstanceStyles. 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.
getSymbolInstanceStyles is provided by the Sketch MCP server (mater1996/sketch-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sketch, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
17 Sketch tools catalogued and risk-classified — across an index of 43,000+ MCP servers.