close_fulfillment_order

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

No annotations are provided, so the description carries the full burden. It explains the semantic outcome (closing as incomplete) and the reason (cannot ship remaining items), adding value beyond the tool name. However, it does not disclose any side effects, reversibility, or preconditions, leaving some behavioral gaps.

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 a single sentence that directly states the action and condition, with no extraneous words. It is front-loaded with the verb 'Close' and efficiently communicates the tool's purpose.

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?

The tool is simple with two well-documented parameters and no output schema. The description adequately covers the purpose and condition for closing. While it could benefit from distinguishing between close, cancel, and other fulfillment order actions, it is sufficiently complete for an agent to select and invoke the tool 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 schema already provides full coverage of both parameters (id and message) with descriptions. The tool description does not add additional parameter semantics, but given the high schema coverage, the baseline 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 uses the specific verb 'close' with the resource 'fulfillment order', and specifies the state 'incomplete' and the condition 'cannot ship remaining items'. This clearly distinguishes it from sibling tools like cancel_fulfillment_order and close_order.

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 clear context for when to use this tool: when the fulfillment service cannot ship remaining items. However, it does not explicitly mention alternatives or exclusions, such as when to use cancel_fulfillment_order instead, so it lacks when-not guidance.

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