fastf1-mcp-server

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively communicates this is a read-only status check (not a mutation), specifies it reports only the in-memory LRU cache (not disk cache), and provides a detailed example of the return structure. However, it doesn't mention potential limitations like rate limits or authentication requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is perfectly structured: purpose statement first, followed by return format, example, and clarifying note. Every sentence adds value - the example demonstrates usage, and the note provides crucial context about cache scope. No wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given this is a simple status check tool with 0 parameters, 100% schema coverage, and an output schema (implied by the detailed return example), the description is complete. It explains what the tool does, what it returns, provides an example, and clarifies scope limitations - exactly what's needed for this tool type.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0 parameters and 100% schema description coverage, the baseline would be 4. The description appropriately states there are no parameters needed ('get_cache_status()') and focuses on explaining what the tool returns rather than documenting non-existent inputs.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific action ('Check server in-memory session cache status') and distinguishes it from siblings by focusing on cache status rather than race data retrieval. It explicitly differentiates from the 'clear_cache' sibling tool by being a read-only status check versus a destructive operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool ('Check server in-memory session cache status') and when not to use it ('Reports in-memory LRU cache only. The FastF1 disk cache is reported separately'). It clearly distinguishes this from the 'clear_cache' sibling tool by function.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.