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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description contributes real added context: it is free, requires no account or payment, reports 'actual enabled capabilities' (as opposed to advertised ones), and will not resume paused services. However, it offers no detail on response structure or on what 'current limits' look like.

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, each carrying information, with the capability list and the 'does not enable' caveat in a sensible order. The opening 'Free; no account, payment or Gravitate credits' is slightly awkward and puts commercial framing ahead of the purpose.

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?

With no output schema, the description does the necessary work of summarizing what comes back (enabled capabilities, free pricing, current limits). For a single-optional-parameter, read-only probe this is nearly complete; only the shape of the returned capability data is left unspecified.

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?

Only one optional parameter (locale) exists, and the schema documents it at 100% coverage, including the en/fr enum. The description adds nothing about locale behavior, so it sits at the baseline where the schema does all the work.

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 combines a clear resource ('Gravitate availability') with the specific capabilities it reports on: photo analysis, image generation, payments, and guidance. It is easily distinguished from the sibling tools (build_photo_shoot_plan, get_photo_guidance, score_photo_observations), but it never names or explicitly contrasts itself with them.

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?

'Use when checking whether Gravitate can analyze photos, generate images, accept payments, or provide guidance' states the triggering conditions explicitly, and 'Does not enable paused services' draws a boundary on what this call will not do. It lacks any pointer to alternative tools for follow-up actions, which keeps it short of a full when/when-not/alternatives statement.

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