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

Annotations already declare destructiveHint=false and idempotentHint=true; the description reinforces idempotency in concrete terms ('confirming again reuses the task') and adds a failure mode not present in annotations — an expired or changed price is refused. Consent must be an explicit user approval, which clarifies the write semantics. It does not describe the resulting job state or what a refusal response looks like, so it is not fully transparent.

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 compact sentences, front-loaded with the action and the user-consent precondition, followed by the failure and repeat-call behavior. Dense and largely waste-free, though the telegraphic 'quote_id and credits exactly as quoted, consent=true' phrasing is terse enough to be slightly harder to parse than necessary.

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 and 4 required parameters, a confirming/mutating tool needs to convey the consent gate, matching requirements, failure behavior and idempotency — and it covers all of those. The remaining gap is the unmentioned job_id, which an agent must infer from context or the schema name alone.

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 only 25% (only consent is documented), so the description carries extra weight. It usefully constrains quote_id and credits to 'exactly as quoted', which is real semantic value the schema lacks, but job_id is never mentioned anywhere, leaving one required parameter unexplained in both schema and description.

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?

The description states a concrete action: accept a quoted price and start the job, with the guard rails (quote_id/credits must match). It is clearly distinct from get_transcription_quote and cancel_transcription_quote by being the accepting step. 'Start the same task' is slightly indirect about what is actually started (a transcription job), which keeps it from a 5.

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 clearly states the precondition for use: the user must have explicitly agreed to the price, and consent=true represents that approval. It also states what happens when the condition fails (expired/changed price refused) and what re-invocation does. It does not explicitly name the alternative sibling (get_transcription_quote to fetch a fresh quote, cancel_transcription_quote to decline), so it stops short of full routing guidance.

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