AI agents call find_callers 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.
The tool performs a lookup operation to identify which functions or methods call a given target. This is purely informational—it retrieves data from a code analysis index without side effects. No code is executed, modified, or deleted. The blast radius of misuse is minimal; an attacker could only gather information about code structure, which does not compromise system integrity or data confidentiality in itself.
From the tool's definition Tool is named 'find_callers' and described as 'Find all callers of a function or method.' This is a query/search operation that retrieves structural information about code relationships without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access find_callers 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 find_callers:
{
"version": "1",
"default": "deny",
"tools": {
"find_callers": {}
}
}find_callers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find all callers of a function or method. 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 find_callers: 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.
find_callers 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 find_callers 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 find_callers. 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.
find_callers 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.