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

Annotations already establish that the operation is read-only, idempotent, and non-destructive. The description adds meaningful behavior beyond that: it requires a connected account and deliberately omits full transcripts. Nothing contradicts the annotations.

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?

One tight, front-loaded sentence states the core action, the scope, the date constraint, the transcript limitation, and the prerequisite. Every clause earns its place.

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 simple read-only listing tool with an output schema and safety annotations, the description covers purpose, scope, and the key prerequisite. It is complete enough for an agent to invoke correctly, though it could have made the limit behavior slightly more explicit.

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 only 50%, and the description compensates slightly by mapping 'calls or chats' to the channel enum and 'date range' to startDate/endDate. However, the limit parameter is not explained in prose, and the description does not add format or constraint details beyond what the schema already shows.

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 a specific verb ('Lists'), a clear resource ('recent calls or chats'), and a scope ('connected Nexwin account', 'date range'). It also distinguishes itself from the sibling get_call_chat_detail by explicitly noting it returns no full transcripts.

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 gives clear context for when the tool is appropriate: recent calls/chats in a date range for the connected account. However, it never explicitly states when to prefer get_call_chat_detail or which conditions rule this tool out, leaving the sibling distinction mostly implied by 'without full transcripts.'

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