twitter_account_payments

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

Annotations already declare readOnlyHint true, and the description reinforces this with 'account read'. It adds operational context by specifying free usage and no credit consumption, which goes beyond the annotations. No contradiction found.

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 extremely concise: two sentences. The first states the primary action and result, the second adds critical context (authentication, cost, and scope). No wasted words; front-loaded and efficient.

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 tool with no parameters and no output schema, the description adequately covers what it returns (payment history), who it's for (your account), and key attributes (free, no credits). It might benefit from mentioning result format or pagination, but these are not essential given the tool's simplicity.

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?

The tool has zero parameters, so schema coverage is 100% trivially. The description appropriately does not add unnecessary parameter details, though it could mention that the result is scoped to the authenticated user's account, which is implied.

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 it retrieves the user's twitterapis.com payment history, listing top-ups and charges. It clearly distinguishes this from sibling tools that focus on Twitter data by emphasizing 'your account' and 'not Twitter data'.

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 mentions authentication via API key and explicitly states it is free and does not spend credits, which guides when to use it. It clarifies it's an account read, not Twitter data, helping differentiate from other tools, though it does not explicitly name alternatives (there are none for payments).

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