Create payment sandbox

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

With no annotations, the description carries the full burden and does well: it discloses that the data is fake/no real payment provider, that it returns an sbx_ id, and crucially a lifecycle constraint ('Deleted 1 hour after creation'). Gaps remain around authorization requirements and whether the call is idempotent or rate-limited.

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?

Four short clauses, all front-loaded: what it creates, its fake nature, the returned id, the 1-hour TTL, and the next step. Zero filler.

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?

No output schema exists, but the description names the return value (sbx_ id) and the TTL, covering what the agent needs to chain calls. The only meaningful omission is any explanation of the 'seed' parameter, which is left undocumented.

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% for the single 'seed' parameter, and the description never mentions it, so nothing explains what a seed controls (e.g., deterministic card/test data generation). The description fails to compensate for the schema gap.

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?

States a specific verb+resource ('Create a fake card-processor sandbox') and immediately frames its scope vs. real infrastructure ('TEST DATA, no money, no payment provider'). An agent can distinguish it from generate_test_data or sandbox_payments without opening any 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?

Gives clear sequencing: 'Use it to start a payment test; next, call sandbox_payments with the returned id,' which routes the agent to the correct sibling. It does not, however, state when NOT to use this tool or contrast it with the other siblings (generate_test_data, invalid_values).

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