Filters a list of numbers, returning only the even ones.
AI agents call filter_even_numbers to retrieve information from Python FastMCP 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 stateless read operation on input data (a list of numbers) and returns a derived result (filtered subset). It has no side effects, does not execute arbitrary code, does not modify persistent state, and does not create, delete, or move resources. The operation is deterministic and reversible in nature (the original list is unchanged). This is a classic Read category tool.
From the tool's definition Tool 'filters' and 'returns' data without modification or side effects. Description indicates pure data retrieval/transformation: 'Filters a list of numbers, returning only the even ones.'
Attacks that exploit this kind of access
Filters a list of numbers, returning only the even ones. It is categorised as a Read tool in the Python FastMCP Server MCP Server, which means it retrieves data without modifying state.
Register the Python FastMCP Server MCP server in PolicyLayer and add a rule for filter_even_numbers: 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 Python FastMCP Server. Nothing to install.
filter_even_numbers 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 filter_even_numbers 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 filter_even_numbers. 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.
filter_even_numbers is provided by the Python FastMCP Server MCP server (rajeshsahu09/mcp). 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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