reply

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

With no annotations provided, the description carries the behavioral disclosure burden. It discloses that the call combines acknowledgment and submission, that the recipient sees the reply as reply_text, and that the completed task envelope is returned. This is meaningful behavioral context, though it does not cover edge cases like already-acked tasks or error behavior.

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 four short sentences with no filler. It front-loads the core purpose and behavior, then adds task-id sourcing, recipient-facing effect, and return value. Every sentence 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?

The operation is simple, an output schema exists, and the description covers source of the key parameter and the return envelope. The only notable gap is the undocumented confidence parameter, and the description could more explicitly contrast with send_dm or ack, but it is otherwise sufficient for correct invocation.

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 input schema has 0% description coverage, so the description must compensate. It adds useful semantics by explaining that a2a_task_id comes from get_inbox and that text is surfaced to the recipient as reply_text. The optional confidence parameter remains unexplained, which prevents a higher score.

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 action: "Reply to an incoming DM" and adds the combined behavior "Ack-then-submit in one call." It also names the source of the required task id, making it easy to distinguish from siblings like send_dm and ack.

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: this is for replying to an incoming DM and should use the A2A task id from get_inbox. It does not explicitly state when not to use it or name alternatives like sending a new DM, but the incoming DM framing implies the distinction.

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