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

Annotations already declare a non-read-only, idempotent, non-destructive, open-world write, and the description is consistent with all of them. It adds genuine behavioral context beyond the annotations: answers are buffered until the full set is given, the token survives a re-quote (supporting idempotency), and payment/signing/binding are out of scope. It stops short of describing error behavior or the returned link's use in depth.

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?

The instruction is front-loaded, which is good, but the four-paragraph narrative repeats the answers_so_far mechanic twice ('passing answers_so_far back each time' and 'Pass the answers_so_far from the previous call back in') and re-states the schema's own descriptions. Some sentences could be cut without losing meaning.

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?

For a stateful, multi-step, 5-parameter write tool with an output schema, the description covers sequencing, the carry-back token, re-quote continuity, and scope limits. With an output schema present, return values need no explanation, so nothing an agent needs is missing.

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 the baseline is 3, but the description adds meaning the schema does not: answers must be given 'under the code it came back with' and 'only what the customer actually said', and only the new answer goes into `answers` while prior ones travel in `answers_so_far`. That incremental-input semantics is the key to calling this correctly.

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 ('file the answers', 'saves what the customer answered against their application') and names the preceding action ('After carrier_questions'), cleanly separating it from the sibling that surfaces questions. An agent can tell what this does and where it sits in the flow 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?

Gives explicit ordering ('After carrier_questions'), the iterative protocol ('passing answers_so_far back each time, until the set is complete'), and a clear exclusion ('This does not take payment, sign anything or bind coverage'). Both when-to-use and when-not are covered, plus the re-quote case.

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