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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds real value beyond that: it warns the deletion is permanent (irreversible), and—more importantly—discloses the owner-scoping rule that a watchId belonging to another principal surfaces as notFound rather than an error. It stops short of covering rate limits or side effects on dependent watches.

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 tightly written sentences, front-loaded with the destructive action and its keying parameter, followed by the ownership caveat. No filler and nothing repeated from the annotations.

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 an output schema present, the description covers the essentials: permanence, scoping/auth behavior, and error mapping for foreign IDs. Nothing an agent needs to call it safely is missing.

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 there is only one parameter, so the baseline would be 3. The description goes beyond that by adding ownership semantics for watchId—cross-principal IDs return notFound—which the schema does not state.

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 ('Permanently removes'), a specific resource ('recurring brand-audit watch'), and the keying parameter (watchId). Easily distinguished from sibling register_brand_audit_watch and list_brand_audit_watches without opening any 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?

The word 'removes' implies the use case, and the owner-scoping note hints at when this will fail, but there is no explicit statement of when to reach for this tool versus list_brand_audit_watches or register_brand_audit_watch. Usage is implied rather than prescribed.

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