create_fulfillment

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 explicitly discloses the key side effect: 'creates a Fulfillment record and marks specified line_items as fulfilled.' This is valuable behavioral context beyond the schema, though it could also mention return value or prerequisites.

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?

Two concise sentences: the first states the purpose, the second states side effects. No filler, front-loaded with the primary action.

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 description covers purpose and side effects, and the schema handles parameter details. However, since there is no output schema, the description does not explain the return value (e.g., the created fulfillment object), which is a minor gap for a creation tool.

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 schema already documents all six parameters clearly. The description adds only a high-level summary ('optionally specifying line items and tracking info') without deeper semantic details, meeting the baseline for schema-covered params.

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 action ('Create a fulfillment for an order') and scopes it with optional line items and tracking info. It distinguishes from sibling tools like update_fulfillment_tracking and get_fulfillment by focusing on creation.

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 usage is implied by the action verb 'create' and the resource 'fulfillment'. It does not explicitly mention alternatives or exclusions (e.g., 'use update_fulfillment_tracking for updates'), but the context makes it clear this tool is for the creation scenario.

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