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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds meaningful behavioral context beyond the annotations by disclosing that activity in the status is not evidence of payment success — a non-obvious semantic trap that could mislead an agent. With output schema present for return values, this is strong transparent coverage.

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?

A single sentence with the core purpose front-loaded and a valuable disambiguation clause after it. Every word earns its place; no filler, no repetition of structured data.

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?

For a zero-parameter, read-only, fully-annotated tool with an output schema, nothing essential is missing. The description supplies the purpose and the one semantic caveat an agent needs to interpret the result correctly; return values are covered by the output schema.

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 tool has zero parameters and 100% schema description coverage, so per rubric guidance the baseline is 4. There is nothing about parameters the description needs to clarify, and it is consistent with the empty input 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 states a specific verb ('Read') and resource ('merchant onboarding/integration lifecycle status'), clearly distinguishing this from sibling tools that deal with payments, accounts, tickets, and webhooks. The caveat 'activity is not proof of a successful payment' sharpens the semantic scope, telling the agent exactly what the status does and does not represent.

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 context is implied rather than explicit: the tool reads a lifecycle/onboarding status, so an agent can infer when to call it. The payment caveat weakly routes away from using this as payment proof, but no alternative tool is named and no explicit when-to-use/when-not-to-use guidance is provided.

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