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

Annotations already flag destructiveHint and idempotentHint, and the description goes well beyond them: it explains the ordering (feedback is folded into aggregates before deletion), what survives (uid-free aggregate counters), and the extra record removed when a key is supplied. That is exactly the 'what gets destroyed and what is retained' context an agent needs before a destructive call.

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?

Front-loaded with the deletion scope, followed by retention and the conditional key behavior — no filler sentences. The parenthetical 'tool_id × used/not_useful/not_relevant' is terse to the point of being slightly cryptic, which costs a point.

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 destructive, no-output-schema tool this covers the essentials: scope of deletion, retained aggregates, and conditional extra deletion. The notable remaining gap is any signal about irreversibility or confirmation, though destructiveHint partially covers that.

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 0% and the lone 'key' property is undocumented, but the description rescues it by establishing that it is a feed key whose record is additionally deleted. The format of the key and its optionality are still left to inference, keeping it short of a 5.

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 concrete verb (delete) and names the exact resources destroyed: anonymous id, tag profile, last_checked. It is clearly distinguishable from siblings like feedback or save_preferences, though it never names an alternative explicitly.

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?

Usage is implied by the destructive verb and the 'If you pass a feed key' conditional, but there is no explicit statement of when an agent should call this versus feedback or save_preferences, nor any prerequisite or confirmation guidance.

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