Search for cities by name and return matching results as resources without outputSchema
AI agents call searchCitiesNoSchema to retrieve information from Weather MCP 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 city name search query and returns results. It retrieves information without creating, modifying, deleting, or executing any operations. The lack of outputSchema does not change the fundamental read-only nature of the operation. Blast radius is minimal — an AI agent cannot cause harm by searching for cities.
From the tool's definition Tool name and description indicate it "Search[es] for cities by name and return[s] matching results" — a retrieval operation with no side effects. The phrase "return matching results as resources" confirms data querying without modification or deletion.
Attacks that exploit this kind of access
Search for cities by name and return matching results as resources without outputSchema. It is categorised as a Read tool in the Weather MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Weather MCP Server MCP server in PolicyLayer and add a rule for searchCitiesNoSchema: 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 Weather MCP Server. Nothing to install.
searchCitiesNoSchema 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 searchCitiesNoSchema 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 searchCitiesNoSchema. 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.
searchCitiesNoSchema is provided by the Weather MCP Server MCP server (mkowalskizoovu/mcp-test). 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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