analytics_period_payment_methods

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

Annotations already declare readOnlyHint=true and openWorldHint=true. The description confirms read-only behavior ('Get') and adds the context of validating the period exists via a prerequisite. It does not elaborate on the openWorldHint or any other behavioral traits, so it adds moderate value beyond annotations.

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 front-loaded with the purpose and includes a prerequisite, usage context, and trigger words in 5 sentences. It is reasonably concise, though the trigger word list could be omitted for brevity.

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 output schema, the description covers purpose, prerequisite, and usage context but does not describe the return value structure (e.g., what fields the breakdown contains). It also lacks detail on the optional account parameter.

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 input schema has two parameters (period required, account optional) with no descriptions (0% coverage). The description does not explain these parameters, their formats, or their meaning beyond implying period is a statement period. It fails to compensate for the missing schema descriptions.

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 tool's purpose: 'Get payment method breakdown for a statement period.' This is a specific verb ('Get') and resource ('payment method breakdown') that distinguishes it from sibling tools like analytics_period_accounts or analytics_period_categories.

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 provides a prerequisite ('Before calling: Call analytics_periods_list first to confirm the requested period exists') and explicit when-to-use guidance ('Use for payment-method totals inside one statement period'). It also offers trigger words. It does not explicitly list alternatives or when not to use, but the sibling set makes the context clear.

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