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

Annotations indicate readOnlyHint=false and destructiveHint=false, so the agent already knows this is a non-destructive write operation. The description adds valuable behavioral details: the quote is free, checkout-ready, requires base64 encoding, and idempotency key reuse. It does not contradict annotations and adds context beyond them.

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 long, front-loads the core purpose, and every clause adds value. It avoids fluff and extraneous detail, making it highly efficient for an agent 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?

With a complete schema (100% coverage), annotations, and an output schema, the description doesn't need to repeat parameter details or return formats. It covers the essential constraints (base64, idempotency, checkout-ready) and purpose. However, it could have mentioned the relationship to sessions.start for obtaining an access token, but the schema's accessToken description already covers that.

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%, so the baseline is 3. The description reinforces that fileBase64 must be base64 and idempotencyKey should be reused for retries, but these points are already present in the schema parameter descriptions. No additional parameter semantics are provided beyond what the schema already covers.

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 clearly states the tool creates a 3D print quote and specifies it is free and checkout-ready. This distinguishes it from sibling tools like quotes.get (read), quotes.update (update), and checkout.create (checkout creation). The verb+resource combination (create quote) is specific and unambiguous.

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 implies usage: create a quote before checkout, and it provides key input constraints (base64 model, idempotency key for retries). However, it does not explicitly name alternative tools for different scenarios (e.g., use quotes.update for modifying an existing quote). Despite this, the context is clear enough for an agent to infer when to use this tool.

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