AI agents call getSchema to retrieve information from Semiotic without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves structural metadata about chart components without modifying, executing, or deleting anything. It is a pure read operation that returns schema information to inform chart configuration, typical of developer introspection APIs.
From the tool's definition Tool name 'getSchema' and description indicate it 'Return[s] the prop schema for a Semiotic chart component' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
Return the prop schema for a Semiotic chart component. Pass { component:. It is categorised as a Read tool in the Semiotic MCP Server, which means it retrieves data without modifying state.
Register the Semiotic MCP server in PolicyLayer and add a rule for getSchema: 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 Semiotic. Nothing to install.
getSchema 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 getSchema 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 getSchema. 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.
getSchema is provided by the Semiotic MCP server (semiotic). 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.
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