AI agents call get_file_structure to retrieve information from CodeGraphMCPServer 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 operation that retrieves metadata and structural information about a file (likely functions, classes, imports, etc.). It has no side effects, does not execute code, does not modify files, and does not delete anything. It is purely informational and falls squarely into the Read category.
From the tool's definition Tool name 'get_file_structure' and description 'Get structural overview of a file' indicate a query operation that retrieves and presents information about code structure without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access get_file_structure gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CodeGraphMCPServer, and nothing reaches the server without passing your rules. This is the rule we recommend for get_file_structure:
{
"version": "1",
"default": "deny",
"tools": {
"get_file_structure": {}
}
}get_file_structure is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get structural overview of a file. It is categorised as a Read tool in the CodeGraphMCPServer MCP Server, which means it retrieves data without modifying state.
Register the CodeGraphMCPServer MCP server in PolicyLayer and add a rule for get_file_structure: 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 CodeGraphMCPServer. Nothing to install.
get_file_structure 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 get_file_structure 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 get_file_structure. 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.
get_file_structure is provided by the CodeGraphMCPServer MCP server (nahisaho/codegraphmcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CodeGraphMCPServer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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14 CodeGraphMCPServer tools catalogued and risk-classified — across an index of 43,000+ MCP servers.