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

Annotations declare destructiveHint=true and openWorldHint=true, yet the description says nothing about what can be destroyed; the fact that supplied design patches can overwrite session content and that public image URLs are fetched sits only in the schema's options text, not the description. It also omits the requestId retry/polling semantics that govern repeated calls, leaving the safety-relevant behavior undocumented at the description level.

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 short sentences with the core action front-loaded and no filler. The second sentence is a genuinely useful handling instruction ('Display the returned preview URL') since there is no output schema, though it is phrased as a customer-facing directive rather than agent guidance.

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 usefully tells the agent the call yields a preview URL. But for a tool flagged destructive and open-world with a nested options bag, it omits the state-overwrite risk and the network-fetch behavior, which are the main things an agent must anticipate; the schema carries that burden instead.

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 schema already explains subject, requestId, sessionToken and the options bag in detail. The description adds no parameter-level meaning beyond what the schema provides, so the baseline of 3 applies.

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 ('Render') and resource ('garment preview') scoped to 'the active design and chosen product', which distinguishes it from create_design, save_design, and ai_photoshoot. The prerequisite context ('existing', 'active design', 'chosen product') makes the operation identifiable without opening the schema, though it does not name any sibling explicitly.

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?

Implies when to use it (a design session is active and a product is selected and the customer wants to see the garment), but never states exclusions or names alternatives such as get_design_session or ai_photoshoot. Usage is inferable rather than specified.

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