get_file

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

The description aligns with the annotation readOnlyHint=true by stating 'Fetch metadata'. It adds the return format (Markdown block with fields) but does not disclose other behaviors like error handling or authorization needs.

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 brief with a clear structure: one sentence for purpose, then separated Args and Returns sections. No unnecessary words or repetition.

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?

The tool is simple with one parameter and no output schema. The description covers the input source, the return format, and the core action. It is complete for an agent to use correctly.

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?

The input schema provides no description for the file_id parameter (0% coverage). The description compensates by specifying that the ID is 'returned by upload_file', giving the agent a source for the value.

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 uses a specific verb 'Fetch' and clearly specifies the resource 'metadata for a single uploaded file'. It distinguishes from siblings like 'get_file_content' by focusing on metadata retrieval.

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 states the purpose and the source of the file_id ('returned by upload_file'), which implies when to use it. It does not explicitly list alternatives or when not to use, but the context is adequate for an agent.

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