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

Beyond the annotations, the description discloses important behavior: the payout object uses kind m2m-arena/payout/v1, requires a root-key signature (`sig`) and a payout-wallet signature (`payout_sig`), and changes take effect after 72 hours. This adds meaningful operational context, though it does not cover permissions or what happens during the 72-hour window.

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 a single front-loaded sentence with no filler, and the key operation is stated first. It is dense but appropriately sized for a tool with important signing and delay semantics.

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 explained, and the annotations cover the safety profile. Still, the input schema is very opaque and the description only partially specifies the nested object's expected contents, leaving some ambiguity 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 schema is an opaque object with 0% description coverage, so the description must compensate. It identifies key fields (`sig`, `payout_sig`) and the expected kind, but it does not fully document the nested object structure or all expected properties.

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 states a specific verb and resource: 'Bind or change the payout address.' It is clear what the tool does, but it does not explicitly distinguish itself from any sibling tool or name an alternative, which keeps it from a 5.

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?

Usage is implied by 'Bind or change the payout address,' and the 72-hour effect delay gives useful context. However, there is no explicit when-to-use guidance, no when-not-to-use condition, and no named alternative among the sibling tools.

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