Get Neo4j graph schema (node labels, relationship types, statistics).
AI agents call get_graph_schema to retrieve information from Code Graph Knowledge System without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about the graph structure without creating, modifying, or deleting any data. It is a passive information query operation with no side effects. The blast radius if misused is minimal—an AI agent gaining schema information could inform subsequent queries, but cannot itself cause data loss, execution, or financial harm.
From the tool's definition Tool returns Neo4j graph schema information: node labels, relationship types, and statistics. The verb 'Get' and the nature of schema inspection indicate read-only retrieval with no modifications to the knowledge base.
Documented attack patterns abuse exactly the kind of access get_graph_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Code Graph Knowledge System, and nothing reaches the server without passing your rules. This is the rule we recommend for get_graph_schema:
{
"version": "1",
"default": "deny",
"tools": {
"get_graph_schema": {}
}
}get_graph_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get Neo4j graph schema (node labels, relationship types, statistics). It is categorised as a Read tool in the Code Graph Knowledge System MCP Server, which means it retrieves data without modifying state.
Register the Code Graph Knowledge System MCP server in PolicyLayer and add a rule for get_graph_schema: 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 Code Graph Knowledge System. Nothing to install.
get_graph_schema 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_graph_schema 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_graph_schema. 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_graph_schema is provided by the Code Graph Knowledge System MCP server (royisme/codebase-rag). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Code Graph Knowledge System, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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30 Code Graph Knowledge System tools catalogued and risk-classified — across an index of 43,000+ MCP servers.