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

Annotations already convey non-readonly, non-idempotent, open-world behavior, so the description only needs to add context beyond that. It adds that live trials produce no operational credential, that this is a legacy path, and that OAuth is the current replacement. It doesn't state whether claiming consumes/revokes the credential or what exactly happens on repeated claims, but the annotations cover idempotency.

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 compact and front-loaded, with two sentences that carry essential scope and routing information. The phrasing 'still-valid historical paid checkout intents' is slightly awkward, but there is no wasted words.

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?

The output schema presumably covers return values, and the description clearly handles the main alternative path. However, because parameter semantics are completely absent, an agent cannot confidently determine how to fill intentId and claimSecret or how to recognize a 'still-valid historical paid checkout intent.' This is a meaningful completeness gap.

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 0%, and the description never explains what intentId or claimSecret mean, where they come from, or how to obtain them. Both parameters are required and only have length constraints, so an agent has no semantic grounding for invoking the tool correctly.

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 action ('claim') on a specific resource ('credentials') and clearly scopes it to 'still-valid historical paid checkout intents.' It also distinguishes itself from the live-trial/OAuth path, making it easy for an agent to tell this tool apart from the many sibling 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 explicitly says when this tool applies ('still-valid historical paid checkout intents') and when it does not ('Live trials never deliver an operational credential in chat'). It also names the preferred alternative: 'install DigitalPublic and use project OAuth instead.' This gives clear routing guidance.

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