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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the description's main job is to add context. It does: it discloses the machine-executable decision values, verifiable evidence, retry semantics, and the compliance attestation returned on allow/review. It also notes there is no API key, which is useful operational context.

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 front-loaded with the critical instruction ('Before your agent pays, call OceanAlt once') and stays focused on the decision output, gate rule, and attestation. It is a little dense in the middle, but every sentence adds useful behavior or context.

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?

With no output schema, the description compensates by explaining the decision values, the gate behavior, and the attestation returned. It mentions retry semantics but does not detail them, and it does not explicitly describe the decline path beyond 'do not pay,' but enough is covered for an agent to invoke it correctly.

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 the schema already documents all four parameters. The description only echoes that the payee address is the core input and does not add meaningful parameter semantics beyond the schema.

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 names a specific action (call OceanAlt once before paying), a specific resource (the payee address), and an exact decision output (allow | review | decline). Its payment-gate purpose is unmistakable and clearly separates it from the sibling flagging/screening 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?

The description gives an explicit when-to-use instruction: call before the agent pays, and use the result as a gate. It also states the key exclusion behavior — if the decision is not 'allow', do not pay. It does not name alternative tools or describe when not to use this tool, so it stops short of a 5.

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