fetch_graph_data

THE RISK

Low Risk

Why fetch_graph_data needs a policy

This tool retrieves and queries existing graph structure data (nodes and edges) to populate a UI visualization. It has no side effects, does not execute code, does not modify or delete data, and does not commit financial obligations. It is a straightforward data retrieval operation fitting the Read category.

From the tool's definition Tool description states it 'fetches project-scoped graph nodes and edges' — a retrieval operation with no modification, deletion, or execution capabilities. The verb 'fetches' and the context of serving data to a UI canvas indicate read-only behavior.

Documented attack patterns abuse exactly the kind of access fetch_graph_data gives an agent:

POLICY

How to control fetch_graph_data

PolicyLayer is an MCP gateway — it sits between your AI agents and CodeGraph, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_graph_data:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fetch_graph_data": {}
  }
}

fetch_graph_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register CodeGraph — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More CodeGraph tools

Destructive decay_and_prune Run temporal memory maintenance: decay relevance scores for old entities and optionally pr Execute trigger_reindex Trigger a reindex of the codebase. Supports incremental (changed files only) or full mode. Execute query_graph Run a raw Cypher query against the code graph. Use with caution - read-only queries only. Write ingest_conversation Ingest a multi-turn conversation into the knowledge graph. Runs the full episodic pipeline Write store_entity Store an entity in the knowledge graph. Deduplicates by text+type — if an entity with the Write store_fact Extract entities and relationships from natural language text using an LLM, then store the Write store_relationship Store a relationship between two entities in the knowledge graph. Entities are referenced Write add Ingest any content into the knowledge graph. Accepts file paths (PDF, DOCX, HTML, CSV,

All 18 CodeGraph tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about fetch_graph_data

What does the fetch_graph_data tool do? +

Internal companion — fetches project-scoped graph nodes and edges for the graph_explorer App UI canvas. It is categorised as a Read tool in the CodeGraph MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on fetch_graph_data? +

Register the CodeGraph MCP server in PolicyLayer and add a rule for fetch_graph_data: 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 CodeGraph. Nothing to install.

What risk level is fetch_graph_data? +

fetch_graph_data is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit fetch_graph_data? +

Yes. Add a rate_limit block to the fetch_graph_data 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.

How do I block fetch_graph_data completely? +

Set action: deny in the PolicyLayer policy for fetch_graph_data. 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.

What MCP server provides fetch_graph_data? +

fetch_graph_data is provided by the CodeGraph MCP server (phoenixrr2113/codebase-graph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CodeGraph tool call.

Start from CodeGraph, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →