billing_and_credits

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions two actions (getting overview and optionally creating checkout), but doesn't clarify if this is a read-only operation, whether it modifies data, what permissions are needed, or any rate limits. The optional checkout creation suggests potential side effects, but this isn't explicitly stated.

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 brief and front-loaded with the main purpose. However, it could be more structured—for example, separating the two functions more clearly. There's no wasted text, but it's somewhat terse given the tool's complexity.

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 tool's complexity (6 parameters, no annotations) and the presence of an output schema, the description is incomplete. It doesn't adequately cover parameter semantics or behavioral traits, though the output schema may help with return values. For a tool with billing and checkout functionality, more context on usage and effects is needed.

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%, so the description must compensate for all 6 parameters. It only vaguely references 'optionally create a checkout session preview/action,' which relates to some parameters (like checkout_plan, success_url), but doesn't explain parameter meanings, relationships, or why certain defaults exist (e.g., history_limit default of 50). Most parameters remain undocumented.

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 the tool 'Get[s] billing + credits overview, and optionally create[s] a checkout session preview/action,' which provides a general purpose. However, it's vague about what 'billing + credits overview' entails and doesn't clearly distinguish this tool from potential siblings (none listed are billing-related, but the description lacks specificity).

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?

No guidance is provided on when to use this tool versus alternatives. The description mentions an optional checkout preview/action, but doesn't explain when to include it or what scenarios warrant its use. There's no mention of prerequisites or exclusions.

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