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

Annotations already declare destructiveHint=true and idempotentHint=true, but the description adds real value on top: it clarifies that nothing is deleted and that versions and deliveries are kept, which materially softens what 'destructive' means here. It also discloses an auth requirement ("Needs your key"). This is exactly the kind of context annotations cannot convey.

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?

The core sentences are tight and front-load the effect and the non-deletion guarantee, but the leading fragment "Watches: configure, unfurl and save free" is unrelated marketing-style noise that does not earn its place. The trailing REST endpoint equivalence is only marginally useful to an agent choosing a tool.

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 one-parameter mutation with no output schema, the description covers what the tool does, what state change results, what is preserved, and that a key is required. Only the return value or confirmation behavior is unspecified, which is a minor gap given there is no output schema.

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 100% and the single watchId parameter is already documented in the schema with its sw_ prefix format. The description only refers to "a saved Watch" and adds no format, lookup, or error semantics beyond that. Baseline 3 is appropriate when the schema carries the parameter burden.

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?

The description names a specific verb and resource ("Retire a saved Watch") and states the concrete effect: it stops being recallable and frees its place. That is enough to distinguish it from siblings like recall_watch or save_watch, though no sibling is named explicitly. The opening fragment "Watches: configure, unfurl and save free" is unrelated boilerplate that dilutes the opening.

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 phrase "Retire a saved Watch," so an agent can infer this is the action for making a watch non-recallable. However, there is no explicit when-to-use/when-not-to-use guidance and no mention of the adjacent alternatives (recall_watch, list_saved_watches) that an agent might confuse with retiring. The endpoint equivalence note is informational, not routing guidance.

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