AI agents call read_file_content 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 only retrieves file contents without modifying, deleting, or executing anything. It falls squarely into the Read category. The optional line range parameter further indicates a safe, query-like operation. Severity is low because reading source code files poses minimal risk even if misused by an agent, and confidence is high given the explicit naming and straightforward description.
From the tool's definition Tool name explicitly states 'read_file_content' and description confirms it 'Read file content with optional line range' — a pure retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access read_file_content 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 read_file_content:
{
"version": "1",
"default": "deny",
"tools": {
"read_file_content": {}
}
}read_file_content is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read file content with optional line range. 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 read_file_content: 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.
read_file_content 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 read_file_content 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 read_file_content. 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.
read_file_content 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.