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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, covering the safety profile. The description adds the valuable 'Creates no charge' detail, which is not captured by annotations and clarifies cost behavior. However, it doesn't disclose other behavioral aspects like rate limits or response format, but given the annotations, a moderate score is appropriate.

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 extremely concise: two short sentences that immediately state the primary purpose and the key non-charge behavior. No wasted words, and the core action is front-loaded. Perfectly structured for quick agent consumption.

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 the tool has zero parameters, a simple read operation, and annotations that fully cover safety aspects (read-only, idempotent, non-destructive), the description sufficiently covers what the tool does, what it returns, and the key cost behavior. Nothing critical is missing for an agent to invoke it correctly.

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?

The tool has no parameters, so the schema carries no semantic burden. The description correctly indicates what information is returned (price, styles, scope) without needing to explain parameters. As this is a parameterless tool, the baseline of 4 is justified.

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 reads the current ROASTED price, styles, and scope, identifying the specific resource and action. It doesn't explicitly differentiate from siblings like get_roast_result, but the term 'offer' vs 'result' provides some distinction. Overall, the purpose is clear and specific.

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 provides no guidance on when to use this tool versus its siblings (get_roast_result, prepare_roast_checkout). It doesn't mention alternatives or conditions for selection, leaving the agent to infer usage based on the name alone. This is a gap given the presence of related tools.

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