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

Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context: results are stateful (COMPLETED is a precondition for content) and the audioUrl is time-limited, which materially affects how an agent caches or retries.

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?

Two sentences, zero filler, and the identifier-selection guidance is front-loaded right after the verb. Every clause carries information an agent needs.

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 does the right thing by naming the return payload (dialogue transcript, time-limited audioUrl) and the completion condition. It stops short of enumerating other possible statuses or whether the agent should poll, which would fully close the loop for an async job tool.

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%, so baseline is 3, but the description adds semantics the schema lacks: jobId is sourced from create_audio_overview, and documentId/lectureSessionId resolve to 'the latest one' rather than a specific record. That 'latest' behavior is not expressible in the terse schema descriptions.

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 (check an audio overview) and immediately disambiguates the three lookup keys, including which one comes from the create sibling. An agent knows exactly what this retrieves and how to target it 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?

It gives clear calling context (use jobId from create_audio_overview, or documentId/lectureSessionId for the latest) which is effectively implied guidance. However, it never names an alternative or exclusion — nothing tells the agent when to prefer get_lecture_audio or get_mind_map instead, nor what to do if no overview exists yet.

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