get_database_schema

THE RISK

Low Risk

Why get_database_schema needs a policy

This tool retrieves metadata about database schema (table and column information) without executing queries, modifying data, or triggering side effects. It is informational only, supporting the AI assistant's understanding of the database structure. This is a classic Read operation with minimal risk — schema inspection is non-destructive and read-only.

From the tool's definition Tool name is 'get_database_schema' and description states it 'Returns the 3DCityDB v5 table structures, column details' — purely a retrieval/query operation with no modification or execution capability.

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

POLICY

How to control get_database_schema

PolicyLayer is an MCP gateway — it sits between your AI agents and 3DCityDB MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_database_schema:

policy.json

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

get_database_schema 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 3DCityDB MCP Server — 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 3DCityDB MCP Server tools

Execute run_query Execute a read-only SQL SELECT query against the connected 3DCityDB database Write submit_feedback Logs feedback for a query execution (rating, errors). Write update_module_selection Narrows the user Read assemble_prompt Assembles the complete system prompt by orchestrating all Read get_db_context_snapshot Returns database-level context: coordinate system, EPSG code, Read get_examples Returns SQL query examples filtered to only include examples Read get_generic_attributes Fetches generic attributes (namespace_id=3) with categorical Read get_history Returns the conversation history for a session.

All 14 3DCityDB MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

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 get_database_schema

What does the get_database_schema tool do? +

Returns the 3DCityDB v5 table structures, column details,. It is categorised as a Read tool in the 3DCityDB MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_database_schema? +

Register the 3DCityDB MCP Server MCP server in PolicyLayer and add a rule for get_database_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 3DCityDB MCP Server. Nothing to install.

What risk level is get_database_schema? +

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

Can I rate-limit get_database_schema? +

Yes. Add a rate_limit block to the get_database_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.

How do I block get_database_schema completely? +

Set action: deny in the PolicyLayer policy for get_database_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.

What MCP server provides get_database_schema? +

get_database_schema is provided by the 3DCityDB MCP Server MCP server (tum-gis/3dcitydb-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every 3DCityDB MCP Server tool call.

Start from 3DCityDB MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →