AI agents call fid_match to retrieve information from Binary MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
FID matching is a binary analysis technique for identifying and comparing functions across binaries. Given the context of static analysis tools (Ghidra, ILSpyCmd) and the pattern of sibling tools that query/analyze without side effects, this appears to be a read-only analysis tool.
From the tool's definition Tool name 'fid_match' suggests function ID matching/comparison, consistent with static binary analysis tasks.
Documented attack patterns abuse exactly the kind of access fid_match gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Binary MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for fid_match:
{
"version": "1",
"default": "deny",
"tools": {
"fid_match": {}
}
}fid_match is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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fid_match. It is categorised as a Read tool in the Binary MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Binary MCP Server MCP server in PolicyLayer and add a rule for fid_match: 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 Binary MCP Server. Nothing to install.
fid_match 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 fid_match 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 fid_match. 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.
fid_match is provided by the Binary MCP Server MCP server (sarks0/binary-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Binary MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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59 Binary MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.