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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false, so safety and world-access are covered. The description adds only that a prompt drives the app; it omits whether the call is synchronous or returns a job/run handle (cf. get_job, get_run), whether it costs credits, and any rate or size limits.

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?

A single compact sentence that front-loads the verb and resource. No filler, though the parenthetical examples are thin and could have carried more decision-relevant detail.

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 zero schema coverage, no output schema, no annotations guidance about async behavior, and no naming of siblings, the definition leaves key call-time decisions (valid app_id, model choice, how to retrieve results) unresolved.

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 0% and the description only echoes the word 'prompt'. It gives no meaning for app_id (which app identifiers are valid, where to obtain them) or for model (allowed values, default), leaving an agent to guess on two undocumented parameters.

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 verb (Run) and resource (a Play app) and gives concrete examples of app types (upscale, transform). However, the title calls it a 'OneOver app' while the description says 'Play app', and it never distinguishes itself from sibling create_run, chat, or the generate_* family, so an agent cannot confidently route among 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?

No when-to-use guidance is given. It does not say whether this is the path for running an existing app versus creating a run (create_run) or a conversational call (chat), nor whether the prompt must reference a specific app already built via build_*.

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