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

Goes well beyond the annotations by disclosing the credit cost model ('one credit per usable success'), sequential-within-a-deadline execution, partial-result retention, and the per-item fields to inspect (attempted, chargeStatus, errorCode). It also gives an explicit anti-retry policy, which the annotations do not cover.

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?

Four tight sentences, front-loaded with the core action and scope, with each subsequent sentence carrying distinct information (cost, execution model, result inspection, retry policy). Dense but no wasted phrasing.

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 helpfully names the response fields an agent must inspect (attempted, chargeStatus, errorCode) and covers credit cost and partial-result behavior. It leaves the exact meaning of 'deadline' and the transcript payload format unstated, a minor gap for an otherwise self-contained definition.

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 100% and the single 'urls' parameter is already fully documented in the schema, including the 1-5 range and credit cost. The description's restatement of the range and credit cost adds no syntax or format detail beyond the schema, so the 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?

States a specific verb and resource ('Retrieve transcripts') plus the batch scope ('1 to 5 pasted YouTube video URLs'), which cleanly separates it from the singular youtube_transcript sibling. An agent can tell what it does and how it differs from the single-URL tool without opening the schema.

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?

The '1 to 5 URLs' bound and the explicit 'Do not retry automatically' warning give some operational guidance, but the description never states when to prefer this bulk tool over youtube_transcript or what to do on partial failure beyond retaining results. Usage is implied rather than spelled out.

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