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

Annotations already declare readOnly, idempotent, and non-destructive, but the description adds genuinely useful clarification: 'No human is contacted and no external write occurs automatically', pre-empting the natural but wrong assumption that a 'handoff' contacts someone immediately. It does not, however, say what the prepared artifact entails or whether a later step performs the handoff.

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 tight sentences with the purpose front-loaded and the most decision-relevant caveat (no automatic contact/write) placed immediately after. No filler.

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 no explanation. The description covers the key non-obvious behavior (no automatic handoff) and the schema covers params fully; the only gap is routing guidance relative to sibling tools.

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 both the 'request' and 'authorization' semantics are already documented in the schema, including that authorization does not itself grant authority. The description adds nothing about parameters, so the baseline of 3 applies.

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+resource ('prepare a human-in-the-loop handoff request'), which is clear on its own. However, with siblings like prepare_outbound_invitation and agent_collaboration_request in the same namespace, it does not distinguish itself from those adjacent request-preparation tools.

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?

There is no guidance on when to use this tool versus the sibling handoff/invitation/policy tools. The phrase 'human-in-the-loop handoff' implies a context, but the agent must infer the triggering conditions and any prerequisites (e.g. needing a bounded result first).

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