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

Annotations cover readOnly/idempotent/destructive, and the description still adds substantial context beyond them: calling the tool itself does not charge, only opening the URL in a browser does, one-time payment with no account, and failed generations are auto-refunded. This reconciles the readOnlyHint with a money-moving workflow rather than contradicting it.

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?

Front-loaded with the return value and the essential precondition, then constraints. The closing sentence about presenter/message/language selection and the ~15-minute turnaround is useful agent-facing context but is the least load-bearing part of an otherwise tight description.

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?

Covers purpose, precondition, charge semantics, and post-purchase flow, which is enough for a 1-parameter tool with no output schema and clear safety annotations. The one real gap is the unexplained claim_token, the only input the agent must supply.

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 single required parameter claim_token is never mentioned in the description, so an agent gets no guidance on where the token comes from or its format. The description must compensate here and does not, dropping below the baseline that a zero-parameter tool would earn.

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 precise verb and resource ('Returns the Stripe checkout URL for the first video of the sampled site'), which an agent can separate from get_video_sample (fetch a video) and get_sample_status (check readiness). The scoping to the first video and to the sampled site removes ambiguity.

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?

Explicit timing trigger is given: 'Call it once the sample is ready,' which ties directly to the get_sample_status sibling. No explicit exclusion or named alternative is stated, so an agent must infer that readiness should be checked with the other tool first.

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