Retrieve all symbols (classes, functions, etc.) defined in a specific file.
AI agents call get_file_symbols to retrieve information from GraphHub without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static code metadata (symbol definitions like classes and functions) from a file. It has no side effects, no code execution capability, and no data modification or deletion. The operation is purely informational, consistent with other Read category tools like 'find_duplicates' and 'find_dead_code' on the same server.
From the tool's definition Tool name 'get_file_symbols' and description 'Retrieve all symbols' indicate a read-only operation that queries and returns metadata about code structure without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access get_file_symbols gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GraphHub, and nothing reaches the server without passing your rules. This is the rule we recommend for get_file_symbols:
{
"version": "1",
"default": "deny",
"tools": {
"get_file_symbols": {}
}
}get_file_symbols is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve all symbols (classes, functions, etc.) defined in a specific file. It is categorised as a Read tool in the GraphHub MCP Server, which means it retrieves data without modifying state.
Register the GraphHub MCP server in PolicyLayer and add a rule for get_file_symbols: 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 GraphHub. Nothing to install.
get_file_symbols 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_symbols 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_symbols. 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_symbols is provided by the GraphHub MCP server (slnquangtran/graph-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GraphHub, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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32 GraphHub tools catalogued and risk-classified — across an index of 43,000+ MCP servers.