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

Annotations already declare destructiveHint=true and idempotentHint=true, yet the description adds real substance beyond them: exactly what is destroyed (the check history), what survives ('Earlier alerts remain'), how invalid/foreign IDs are handled, and the permission needed. That is precisely the data-loss and error-behavior context an agent needs before calling a destructive tool.

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?

Four short sentences, front-loaded with the destructive nature and the scope of deletion, then the retention note, the error case, and the permission requirement. Nothing is repeated from the annotations and no sentence is padding.

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 destructive tool with no output schema, the description covers consequences, retention, error behavior and authorization, which is close to sufficient. It stops short of routing the agent to list_watches for ID discovery or to pause_watch for the reversible case, which is the main remaining gap.

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 description coverage is 0%, so watch_id is undocumented in the schema. The description partially compensates by constraining it to an ID that must belong to the user's watches (and implying refusal otherwise), but it never says how to obtain a valid ID, nor adds type or format guidance beyond the integer type in the schema.

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 ('Permanently remove one watch') plus the scope of removal ('its check history'), which separates it cleanly from get_watch, list_watches, pause_watch and resume_watch in the sibling list. An agent can tell exactly what this does without opening the schema.

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 only implied: the word 'Permanently' hints that pause_watch is the reversible alternative, but that sibling is never named and there is no explicit when-not-to-use guidance. The refusal rule for foreign IDs is the closest thing to a precondition, and the permission requirement covers the access side.

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