replay_packet

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

With no annotations, the description carries the full disclosure burden. It does add important behavioral context that this touches real hardware and gates the write behind human approval via user_confirmed. But it omits whether the call is irreversible, what auth/permissions are needed, what happens on device errors, or whether it opens the device itself.

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?

Two short sentences with zero filler; the action is front-loaded and the safety constraint follows immediately. 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?

An output schema exists so return values need not be described, but with 6 parameters at 0% schema coverage and no annotations, key invocation details are missing: the meaning of setup_hex, hex_data format, and any device-session preconditions. For a real-hardware write tool this leaves too much to guesswork.

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% across 6 parameters, so the description must compensate and largely does not. It explains only user_confirmed's intended value (approval gate), leaving vid, pid, endpoint, hex_data, and setup_hex entirely undefined in both schema and prose (e.g., hex encoding format, whether setup_hex indicates a control transfer).

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 ('Send one packet to real hardware') and even bounds the scope to a single packet, which is more precise than the bare name. It does not name any sibling, but the send-a-packet action is clearly distinct from the capture/diff/report siblings.

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 second sentence implies when the tool is safe to invoke ('Only set user_confirmed=True after the human approved this exact packet'), which is genuinely actionable usage guidance. However, it gives no prerequisites such as needing an active device/capture session, and no guidance on when to prefer this over other tools.

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