Checks whether a query returns the expected number of records. Useful for validating script results.
AI agents call fm_assert_count 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.
This tool performs a read-only query operation to validate record counts. It retrieves data for comparison but does not create, modify, delete, or execute scripts. While the server context mentions script execution and CRUD capabilities, this specific tool is limited to counting/asserting, making it a Read-category operation with low severity.
From the tool's definition Tool name 'fm_assert_count' and description 'Checks whether a query returns the expected number of records' indicate a validation/assertion operation that queries and counts records without modifying, deleting, or executing external operations.
Documented attack patterns abuse exactly the kind of access fm_assert_count 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_assert_count:
{
"version": "1",
"default": "deny",
"tools": {
"fm_assert_count": {}
}
}fm_assert_count 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.
Checks whether a query returns the expected number of records. Useful for validating script results. 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_assert_count: 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_assert_count 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_assert_count 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_assert_count. 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_assert_count 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.