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

Annotations declare readOnlyHint=false and idempotentHint=true, and the description adds the reason a write hint is warranted: 'May initialize eligible one-time allowance.' It also scopes the mutation by ruling out processing start. It stops short of saying what the allowance initialization changes or how eligibility failures surface.

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?

Three short sentences, with the sequencing condition front-loaded and the scope exclusion last. 'May initialize eligible one-time allowance' is slightly hedged and does not state the conditions under which initialization occurs, costing a point.

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 an output schema present, return values need no explanation, and the description covers sequencing, the side effect, and what the call does not do. What remains unsaid is how an ineligible result should be handled and whether the quote must be carried into a subsequent call.

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 100% and both parameters are documented in the schema, including the constraint that sourceAssetId comes from the DubSync upload API and targetLanguage from dub_list_languages. The description adds no parameter-level meaning beyond that, 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?

The description gives a concrete action set ('check required usage and eligibility') for a pre-authorization check and explicitly bounds it with 'This does not start processing.' It does not use the word 'quote' or state that cost/pricing is returned, so the tie to the tool name relies partly on the title rather than the description alone.

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 trigger condition ('after upload completion') and the purpose relative to the user's authorization step. It does not name a specific alternative for actually starting processing, though 'This does not start processing' implies the agent must move elsewhere to do so.

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