Retrieve user product key

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered without the description. The description does add useful scoping context (self-scoped via GET /users/me/license, no mutation) but nothing on rate limits, auth requirements, or response behavior — appropriate given annotation coverage.

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?

Short and front-loaded, but the title is repeated verbatim as the opening line and then paraphrased in the second sentence, which is redundant filler. The Immich operation/tag trailer is compact metadata that is acceptable.

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 zero-parameter, read-only lookup this covers what the agent needs; the description also hints at the payload semantics ('whether the user has a registered product key'). With no output schema, a brief note on the returned fields (e.g., key/activation status) would make it fully complete.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; the description correctly implies the user identity is taken from the session rather than passed in.

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 gives a specific verb and resource and narrows scope to the current user's own product key ('whether the current user has a registered product key'), which separates it from server-license and admin user-license operations. It does not explicitly name a sibling (e.g., set_user_license / delete_user_license / get_server_license) to route the agent, so it stops just short of a 5.

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?

There is no when-to-use guidance, no prerequisites, and no mention of the related license tools (set_user_license, delete_user_license, get_server_license) that an agent could confuse this with. The only routing signal is implicit in the name/description.

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