Analyzes the database structure: lists tables or shows all fields of a table with native FM field types from $metadata.
AI agents call fm_introspect to retrieve information from Filemaker without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
fm_introspect retrieves database schema information (tables and field definitions) with no side effects. This is clearly a Read operation. Severity is high rather than low because unrestricted schema introspection on a FileMaker database could expose sensitive structural information that aids reconnaissance for subsequent attacks, even though the tool itself performs no modifications or destructive actions.
From the tool's definition Tool description states it 'lists tables or shows all fields of a table' and 'Analyzes the database structure' — purely read-only operations querying metadata without modification.
Documented attack patterns abuse exactly the kind of access fm_introspect gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Filemaker, and nothing reaches the server without passing your rules. This is the rule we recommend for fm_introspect:
{
"version": "1",
"default": "deny",
"tools": {
"fm_introspect": {}
}
}fm_introspect 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.
Analyzes the database structure: lists tables or shows all fields of a table with native FM field types from $metadata. It is categorised as a Read tool in the Filemaker MCP Server, which means it retrieves data without modifying state.
Register the Filemaker MCP server in PolicyLayer and add a rule for fm_introspect: 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 Filemaker. Nothing to install.
fm_introspect 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 fm_introspect 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 fm_introspect. 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.
fm_introspect is provided by the Filemaker MCP server (joergkoester/mcp-server-filemaker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Filemaker, 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.
19 Filemaker tools catalogued and risk-classified — across an index of 43,000+ MCP servers.