isw_get_airtime_epins

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

No annotations exist. Description only adds that confirm must be true, which is already in schema. No disclosure of side effects, idempotency, or post-purchase behavior.

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?

Extremely concise (one sentence plus note) but at the cost of completeness. Structure is adequate for the little content provided.

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?

With 7 parameters, no output schema, and a write operation, the description is too sparse. It does not explain parameter relationships, return values, or operational context.

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 43% (3 of 7 parameters have descriptions). The description adds no parameter details beyond the schema, failing to compensate for undocumented parameters like customerId, transactionRef, payableCode, and extra.

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 clearly states the verb 'purchase' and resource 'airtime e-pins', giving a specific purpose. It implicitly distinguishes from sibling 'isw_airtime_recharge' which likely recharges directly without e-pins.

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 on when to use this tool versus alternatives. The note 'Requires confirm: true' is a parameter requirement, not usage context. No exclusions or scenarios provided.

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