purchase_did

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

There are no annotations, so the description carries the full burden of behavioral disclosure. It says 'purchase' but does not explain important traits such as whether the purchase is irreversible, whether it incurs billing, whether availability is re-checked, or what happens on success or failure. For a financial mutating operation, this is a significant gap.

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 one short sentence with a clear action verb and a list of required parameters. It is efficiently structured and easy to parse, though the parameter list duplicates schema information.

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 no annotations, no output schema, and multiple interdependent parameters, this description is too thin. It does not state what the response will be, what a successful purchase returns, how to handle conflicts, or how this fits into the broader DID workflow.

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 parameters. The description only repeats the required parameter names without adding meaning beyond the schema. This meets the baseline but adds no extra value.

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?

States a specific verb and resource: 'Purchase an available DID.' This clearly identifies the operation and differentiates it from list/get/update/delete sibling tools by implying an acquisition action. However, it does not explicitly name a sibling, so it stops short of full differentiation.

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 is given about when to use this tool versus alternatives like list_available_numbers, get_did, update_did, or delete_did. It does not mention prerequisites such as first listing available numbers or owners/addresses, nor does it state when not to use it.

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