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

The annotations already declare that this is a non-read-only, non-idempotent, non-destructive operation. The description adds important behavioral context by saying it must be called once and that it returns a quote_handle used by later calls. It does not discuss session lifetime or error behavior, but the annotations and output schema cover much of the safety and return-value burden.

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 description is two sentences, front-loaded with the core action and followed by the essential sequencing rule. Every sentence carries useful information with no wasted wording.

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 one-parameter session-start tool with annotations and an output schema, the description provides everything an agent needs: when to call it, that it should be called once, and how to use the returned handle. No critical context 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 description coverage is 100%, and the single agent_identifier parameter is fully documented in the schema. The description does not add meaning beyond the schema for that parameter, so the baseline score of 3 is appropriate.

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 specific verb and resource: starting a new car insurance quote. It also clarifies this is the session-initialization step that must precede all other quote tools, which distinguishes it from the sibling rate tools.

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 explicit sequencing guidance: call this once before any other quote tool. It also explains the required follow-up behavior: pass the returned quote_handle to every later tool call for this quote.

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