books_update_purchase_order

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

No annotations are provided, so the description must disclose behavioral traits. It simply states 'Update' without explaining partial vs full replacement, required fields, side effects, or return behavior. This is a minimal mutation tool description with no additional context.

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 with no redundancy, which is concise. However, it is too terse for a tool with 22 parameters and nested objects, making it under-specified rather than appropriately sized.

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 22 parameters, no annotations, and no output schema, a one-sentence description is severely incomplete. It does not convey update semantics, field applicability, return values, or any operational context, making it wholly inadequate for the tool's complexity.

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 has 22 parameters with 0% description coverage. The description does not mention any parameter names or semantics, failing to compensate for the low coverage. It adds no value over the schema itself.

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 updates an existing purchase order in Books. The verb 'Update' and resource 'purchase order' are specific and distinguish it from sibling tools like books_create_purchase_order and books_delete_purchase_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 phrase 'Update an existing purchase order' implies use when modifying an existing order, but no explicit guidance or exclusions are provided. It doesn't mention when to prefer this over create/delete or other related tools.

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