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

Annotations cover mutation (readOnlyHint false) and idempotency (idempotentHint true). The description adds critical context: the tool returns an approval URL first and no change occurs until human approval, plus the instruction to reuse requestId and details for retrieval. This goes well beyond the annotations and clarifies the two-step execution model.

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?

Three sentences, front-loaded with the primary purpose, then the approval flow and idempotency instruction. No filler, every sentence adds value. Structure is clear and scannable.

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 tool has an output schema (not shown) which covers return values. The description covers the essential flow (approval URL, delayed change, idempotency). It does not mention ownership verification details or error conditions, but for a two-parameter tool with a clear purpose, this is nearly complete. Minor gap: how to use the approval URL after receipt.

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 coverage is 0%, so the description carries the burden. It clarifies that requestId is used for retrieval and that details contains the ticket id and message, but it does not explicitly state that 'id' is the ticket identifier or describe the message field. The reuse hint adds meaning, but parameter roles are only partially explained.

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 (send), resource (support ticket), and clarifies it is an external message not a private draft. Distinct from sibling ticket tools like create, get, or set_status. The agent knows exactly what action this performs.

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 implies usage (replying to a ticket) and notes the ticket must be owned, but does not explicitly contrast with alternatives like ticket_get or ticket_set_status. No when-not-to-use guidance is provided. The approval-flow note gives context but not tool selection direction.

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