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

Without an output schema this description carries the full return-value burden and does so: it enumerates credits, videos_5s_left, low, expires_next, buy_url, generation_blockers, rights_confirmation_required and explains the boolean flags. What it leaves unexplained is why annotations mark readOnlyHint=false — whether a quote record is persisted or expires — which is a real gap for a tool described as side-effect-free.

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?

The purpose is front-loaded, which is good, but the remainder is one dense run-on paragraph with nested parentheticals (price list, three boolean branches, rights entries, then a raw JSON snippet). The information is valuable but the structure makes it slow to parse and the pricing parenthetical could be trimmed.

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 two-parameter quoting tool with no output schema, it covers costs, gating flags, blockers, rights confirmation and the user-facing messages to relay — enough to act correctly. Missing only the meaning of 'version' and whether the quote is persisted or time-limited.

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 coverage is 0%, so the description must compensate, and it does for the important one: 'path.id' is explicitly the project id. The 'version' field is shown only as an example value (3) rather than explained, so half the parameter semantics remain guesswork.

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 and resource ('Quote the reviewed scene in credits') and immediately scopes it with 'without starting a video or charging', which implicitly separates it from the generate/launch siblings. It never names the sibling tool it is an alternative to, so the differentiation must be inferred from the negation rather than stated.

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?

Gives concrete use context: call this before requesting approval to generate, and check generation_available and generation_blockers first. It also tells the agent what to do at each outcome (insufficient → buy at buy_url, low_after → warn, watermark → relay message), though it does not explicitly say when to skip this tool altogether.

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