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

The description discloses commercial behavior: it is free, limited to one per wallet, and requires no payment. However, with no annotations, it does not disclose that this is a state-changing claim, what a repeat claim returns, or what a successful response contains. The 409/paidNext behavior appears only in the schema, not in the tool description.

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 short, front-loaded with 'FREE' and 'one per wallet,' and contains no redundant filler. It earns its two sentences, though the wording is sales-oriented rather than purely technical. Structurally it is easy to scan and parse.

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 claim tool with no output schema and no annotations, the description omits important contextual details: what happens after a successful claim, how the claimed trial is used with webcap_extract, and how this differs from trial_claim_analyze or trial_claim_capture. The schema covers signature mechanics, but the description alone is only minimally sufficient.

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 url, payer, and signature are already fully documented. The description adds only 'single-URL' and 'wallet' context and does not explain the signature requirements, but the schema already covers that detail. This is the appropriate baseline for high schema coverage.

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 identifies a specific action: claiming a free, one-per-wallet single-URL structured extraction before purchasing webcap_extract. It clearly differentiates from the paid webcap_extract tool by marking itself as the free trial claim step. It is somewhat promotional but still names the resource and verb.

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?

'Claim it before buying webcap_extract' gives an explicit ordering rule, and 'one per wallet' communicates a usage limit. The description implies this is the entry-point trial for the paid extraction tool. It does not mention the other trial_claim_* siblings, so routing among those is left to the tool names.

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