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

Annotations already flag destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is known; the description adds real substance on top by disclosing the side effect of CDN unpublishing and the irreversible dangling-reference consequence. It stops short of saying what a second call does or whether missing IDs error, which matters given idempotentHint=false.

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?

Two tight sentences: the verb and its CDN side effect come first, the irreversible consequence second. No filler, no restatement of the title.

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?

Return values are covered by the output schema and the destructive semantics plus cascade behavior are spelled out, which is what an agent most needs for a delete. Minor gap: nothing on error behavior for a nonexistent ID or on repeat calls, notable given the non-idempotent annotation.

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?

Single required parameter with 100% schema description coverage, so the schema fully documents datafile_id. The description adds no format, sourcing, or lookup guidance beyond that, which is the expected baseline when the schema does the work.

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?

Specific verb+resource ("Permanently delete a datafile") with the key qualifier that CDN unpublishing is folded in. It implicitly distinguishes itself from the unpublish_datafile sibling via the parenthetical, but never names that sibling outright, so an agent must infer the boundary.

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 implies when this is appropriate (permanent removal, not just unpublishing from the CDN), but it never explicitly says "to merely take offline use unpublish_datafile" or states prerequisites such as required permissions or whether the datafile must be unpublished first. Usage context is implied rather than stated.

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