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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is known; the description still adds the non-obvious fact that deletion is permanent with no trash or recovery, which is the key risk detail an agent needs. It stops short of covering what happens on a missing path or whether confirmation/errors occur.

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?

One sentence with the action first and the irreversibility warning parenthetically attached. Nothing is wasted and nothing important is buried.

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 single-parameter, no-output mutating tool with full annotation coverage, the description supplies the critical permanence warning. It could be complete with a note on failure behavior for nonexistent paths and permission requirements, but those are secondary.

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?

Schema coverage is 100% and the single path parameter is documented in the schema, so the baseline is 3. The description adds nothing about path format (relative vs absolute), directory handling, or behavior when the path does not exist.

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?

States a specific verb and resource: delete a file from the space's file storage. The scope ('your space's file storage') separates it from other storage operations, but with siblings kb_delete and kb_forget present the description never says what those delete instead, so an agent must guess which delete-family tool applies.

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?

No explicit when-to-use or when-not-to-use guidance, and no routing to or away from the similarly named siblings kb_delete and kb_forget. The 'no trash' note warns about consequences but gives no selection criteria.

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