Hand a task from one agent to another without losing the thread (PAID $0.10)

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

Annotations already declare write, non-idempotent, non-destructive, open-world, so the safety profile is covered. The description adds genuinely useful context the annotations lack: the paid x402 cost (0.10 USD USDC on eip155:8453) and the remote POST route. It does not disclose what the handoff persists, whether state is replaced or appended, or retry behavior — significant for a non-idempotent write.

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?

It is short and front-loaded, but the first sentence is a verbatim restatement of the title with zero added information, and the second is a paywall/route notice. No sentence is bloated, yet one of only two is pure duplication.

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 and annotations exist, so return values and safety need not be described. But for a 6-parameter tool with a nested free-form state object and 17% schema coverage, the description omits essentially all operational detail an agent would need to construct a valid handoff payload or understand the resulting state.

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 17% across 6 parameters, and the description compensates for none of it. It never explains what task_id identifies, the role of from_agent versus to_agent, the purpose of context_sha256 (integrity hash of what?), or how acceptance_criteria is consumed by the receiving agent — leaving the majority of the input underspecified.

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 — handing a task/thread state from one agent to another — which is concrete enough for an agent to recognize the operation. It does not, however, distinguish itself from adjacent siblings such as v1_a2a_escrow, v1_a2a_settlement, or v1_task_acceptance, so the agent must infer which link in the handoff chain this is.

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 many A2A/agent siblings, nor on prerequisites such as both agents needing to be registered or an escrow/settlement step needing to happen first. The only usage-like information is the cost and endpoint, which tells the agent how to pay, not when to call.

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