create_token

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

With no annotations, the description must fully convey behavioral traits. It only states a create operation without disclosing side effects, permissions, idempotency, error behavior, or what the token represents beyond being for recurring payments. This is insufficient for safe agent decision-making.

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 a single sentence of 7 words, which is concise and front-loaded. However, for a tool with 4 parameters and no output schema, it may be too terse; a bit more detail without verbosity would improve it.

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?

Given the lack of output schema, the description does not explain what the tool returns or the effect of token creation beyond 'for recurring payments'. It omits crucial context like token lifetime, idempotency, or relationship to other tokens, making it incomplete for an agent to fully understand the tool's role.

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 baseline is 3. The description itself does not add any meaning beyond the schema; it only reiterates the overall purpose. Parameters are adequately documented in the schema, but the description does not enhance them.

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 explicitly states the action 'Create' and the resource 'card token', and specifies the context 'for recurring payments'. This clearly differentiates it from sibling tools like 'create_payment_url' (creates a payment URL, not a token) and 'pay_with_token' (uses an existing token).

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 implies use when needing a card token for recurring payments, but does not provide explicit guidance on when to use this tool versus alternatives (e.g., create_payment_url for one-time payments). No when-not-to-use conditions or prerequisites are mentioned.

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