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

Beyond the annotations, it discloses the key behavioral traits an agent needs: one-time use, 25 successful calls, any single tool, not tied to IP, valid 30 days, and where to place the returned token. The readOnlyHint=false annotation is consistent with a claim action, and the description adds substantial 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?

Three dense sentences, front-loaded with the core offer, followed by the input rule and token-passing mechanics. Every sentence carries actionable information with no waste.

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 two-parameter claim tool with no output schema, the description covers what the trial provides, the mutually exclusive input rule, and how to use the token afterward. Nothing essential for calling it correctly is missing.

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 coverage is 100%, but the description adds a constraint not expressed in the schema: submit exactly one of email or wallet. It also clarifies that no email is sent and how the resulting token is passed via params._meta or the X-Trial-Token header, which is valuable semantic guidance beyond the field descriptions.

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 precise verb and resource: claim a one-time trial pass of 25 free successful calls. It specifies scope (any single tool), duration (30 days), and non-IP binding, so an agent can tell exactly what the tool offers without opening the schema.

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?

It gives a clear usage condition (claim a one-time trial) and an explicit input constraint: send exactly one of a Base wallet or a work email. It does not name when not to call it or any alternative path, but there is no obvious sibling alternative among the listed tools.

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