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

Annotations only declare readOnlyHint=false, idempotentHint=false, destructiveHint=false. The description adds substantial context beyond that: no funds move, only a timestamp is written, moderation status and amount are untouched, the confirmation is visible only on the viewer's own row, and the 'I have paid' button is not a payment result. That is exactly the behavioral detail an agent needs for a payment-adjacent mutation.

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 front-loaded with a long anti-fraud disclaimer rather than the operation itself, and the 'records a timestamp only' point is restated near the end. Most sentences do earn their place, but the length and repetition cost it.

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?

No output schema exists and the tool is a small two-parameter mutation, and the description covers side effects, visibility, and the meaning of the confirmation well. The main gap is proposal_id's semantics and any warning about repeated confirmation (idempotentHint=false), which it never addresses.

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 50%: row_id is documented in the schema, proposal_id is not. The description compensates for row_id by directing the agent to list_data_rows, but says nothing about proposal_id's meaning or source. Partial compensation only, so the baseline 3 is right.

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: it records a 'payment confirmed by the publisher' timestamp on one row, and explicitly distinguishes itself from set_data_row_status and set_form. An agent can tell exactly what this does and does not do without opening the schema.

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?

Explicit about when to use it (after checking the money in your own WeChat Pay/Alipay statement), where to get the identifier (list_data_rows), and clarifies that the viewer need not press 'I have paid' first. It also names the alternative tool for a different job (set_data_row_status for moderation).

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