Search for cities by name and optionally filter by country.
AI agents call search_cities to retrieve information from SQLite Geography Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only search against a SQLite geography database. It returns matching city records based on search criteria (name and optional country filter) with no side effects, data modification, or command execution. The blast radius of misuse is minimal—an agent could retrieve unwanted geographical information but cannot alter, delete, or trigger external actions.
From the tool's definition Tool name 'search_cities' and description 'Search for cities by name and optionally filter by country' indicate a query operation that retrieves geographical data without modifying, deleting, or executing external operations.
Attacks that exploit this kind of access
Search for cities by name and optionally filter by country. It is categorised as a Read tool in the SQLite Geography Server MCP Server, which means it retrieves data without modifying state.
Register the SQLite Geography Server MCP server in PolicyLayer and add a rule for search_cities: 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 SQLite Geography Server. Nothing to install.
search_cities 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 search_cities 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 search_cities. 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.
search_cities is provided by the SQLite Geography Server MCP server (pdichone/mcp-course-code). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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