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

The description goes beyond the annotations by specifying concrete effects: removal from S3 storage and the database, immediate quota freeing, and irreversibility. It also adds the safety requirement to confirm with the user. This provides valuable behavioral context beyond the destructiveHint annotation.

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 heavily repetitive: the opening paragraph is repeated verbatim in the 'When to use' section, and the notes section echoes the same content. While markdown headings provide structure, the redundancy makes it unnecessarily long. Every sentence does not earn its place; this could be condensed to two sentences.

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?

For a simple tool with one parameter and no output schema, the description covers the key behavioral outcomes (deletion, storage removal, quota freeing) and provides a critical safety warning. It does not discuss error cases or return values, but given the tool's simplicity and the annotations covering destructive/idempotent hints, it is largely complete.

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 schema already covers 100% of the single parameter with a clear description. The description's 'Parameters to validate' section simply repeats the schema text verbatim, adding no additional meaning. Baseline 3 is appropriate because the schema does the heavy lifting and the description adds no new insights.

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 explicitly states 'Permanently delete a file from the user's Drive' with a clear verb and resource. It also details the deletion from S3 storage and database, distinguishing it from other delete_* tools. The scope is unambiguous and matches the tool name.

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 'When to use' section restates the purpose rather than providing situational guidance or excluding alternatives. It does include a strong usage instruction ('ALWAYS ask for explicit user confirmation before calling'), but it does not mention when to use this vs. other file tools or when not to use it. Guidance is implied rather than explicit.

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