Run one model synchronously

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

Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=false, so the safety bar is lower, yet the description adds real traits: the call incurs payment, a synchronous timeout can leave an unknown paid outcome, queue submissions return only a receipt, and no retry or polling is performed. It does not disclose what a successful synchronous response contains, which is the main remaining gap.

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?

Five short clauses, front-loaded with the core action and payment/validation context before failure-mode caveats; dense but largely waste-free. The 'do not invent fields or choose a default' clause partially restates the required-parameter constraint already visible in the schema.

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 paid, destructive, open-world synchronous tool with no output schema, the description supplies the critical context: payment, no retry/polling, queue-vs-sync distinction, and timeout ambiguity. It stops short of describing the success payload or the confirm/account prerequisites, but the schema and annotations cover those adequately.

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% across 6 parameters (including nested lifecycle objects), so the schema already documents model_id, input, confirm, store_io and lifecycle semantics. The description reinforces that model_id/input must be exact and not guessed, but adds no syntax, format or mapping detail beyond what the schema states, so baseline 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?

The description states a specific action (paid model request, run synchronously) with concrete scope: exact model_id/input, validation against the fetched native schema, no invented fields or defaults. It hints at the sibling split ('Queue submissions return receipt only') but never names submit_job/submit_generation_batch/generate_image, so the agent must infer which async alternative to pick.

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?

It implies usage conditions (only after native input-schema validation, only when the request is confirmed paid) and rules out retry/polling behavior, which is genuine guidance. However there is no explicit when-to-use-this-vs-siblings statement, and no stated prerequisites such as account/confirm requirements beyond what the schema already shows.

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