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

The annotations already mark the tool as non-read-only and non-idempotent, but the description adds crucial behavioral details: the handoff is short-lived, payment is collected externally by MaxVideoAI, and the tool invalidates the old short-lived quote. It also warns about the required post-funding workflow dropdown. This goes well beyond what the annotations or schema convey.

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 with no filler. Every clause contributes essential information: short-lived, no payment handling, invalidation of the old quote, and recommended follow-up. The purpose is front-loaded and the structure makes the side effect and next steps easy to parse.

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?

Given a single parameterhare, no output schema, and no nested objects, the description covers the trigger, side effects, and follow-up actions. The only gap is that it does not explicitly describe the return value (presumably the top-up handoff URL), though the tool name 'link' and the phrase 'web handoff' make the output reasonably inferable.

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?

With 0% schema description coverage, the description must compensate for the lone quoteId parameter. It never explicitly names quoteId or states 'quoteId is the identifier of the prepared quote,' but the phrases 'the prepared quote' and 'old short-lived quote' make that mapping inferable. For a single parameter, this is minimally adequate but not explicitly documented.

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 opens with a specific verb and resource: 'Creates a short-lived MaxVideoAI web handoff' and scopes it to a concrete condition ('when the prepared quote needs more credits'). It also clarifies a likely misconception ('does not take payment'), which distinguishes it from payment-related workflows. The purpose is unambiguous and clearly differentiated from siblings like create_reference_upload_link.

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 description gives an explicit trigger condition ('when the prepared quote needs more credits') and a clear follow-up sequence: after funding, call get_account_status then prepare_generation for an exact quote. It also states an exclusion: this tool does not take payment. However, it does not explicitly name an alternative tool to use instead, so the guidance is strong but not fully explicit about alternatives.

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