Search for cities by name and return matching results as text without outputSchema
AI agents call searchCitiesNoSchemaText 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 retrieves city data based on search criteria with no side effects. It is a read-only operation that queries and returns information without altering state, executing code, or triggering external systems. Low severity due to minimal blast radius if misused—an AI agent could only retrieve inaccurate or excessive city data, causing no harm beyond potential misinformation.
From the tool's definition Tool name 'searchCities' and description 'Search for cities by name and return matching results' indicate a query/lookup operation. The 'NoSchemaText' suffix denotes output format variation, not functional scope change.
Attacks that exploit this kind of access
Search for cities by name and return matching results as text 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 searchCitiesNoSchemaText: 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.
searchCitiesNoSchemaText 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 searchCitiesNoSchemaText 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 searchCitiesNoSchemaText. 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.
searchCitiesNoSchemaText 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.
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