initiate_phone_number_order

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

No annotations are provided, so the description carries full burden. 'Initiate' suggests a write operation that likely creates/purchases a phone number, but it doesn't disclose critical behavioral traits: whether this is a synchronous purchase or just starts an order process, what permissions are needed, if there are costs/rate limits, or what happens on failure. The description mentions a return type but gives no details about response structure or success/failure indicators.

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 appropriately brief but poorly structured. The first sentence is clear, but the Args/Returns sections are misleading due to parameter mismatch. While concise, the structure creates confusion rather than clarity, with documentation that doesn't match the actual interface.

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?

For a write operation with no annotations, 0% schema coverage, no output schema, and a nested object parameter, the description is insufficient. It doesn't explain what 'request' should contain, how to format phone numbers, what 'connection_id' refers to, or what the response includes. The parameter mismatch makes it actively misleading rather than merely incomplete.

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 0%, and the description lists two parameters (phone_number, connection_id) that don't exist in the actual schema (which has only one 'request' object). This creates a severe mismatch. The description adds incorrect parameter information rather than compensating for the schema's lack of documentation.

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's purpose with 'Initiate a phone number order' - a specific verb ('initiate') and resource ('phone number order'). It distinguishes from siblings like 'list_available_phone_numbers' (browsing) and 'get_phone_number' (retrieving). However, it doesn't explicitly contrast with 'update_phone_number' (modifying existing numbers), which would make it a perfect 5.

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?

No guidance on when to use this tool versus alternatives. The description doesn't mention prerequisites (e.g., needing available numbers first), nor does it differentiate from similar tools like 'update_phone_number' or 'get_phone_number'. The agent must infer usage from the name alone.

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