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

The readOnlyHint=true annotation already covers the safety profile, so the bar is lower. The description adds some behavioral value by listing the action types returned and specifying ordering ('latest first'), but discloses nothing about pagination, auth requirements, or error behavior for this list endpoint.

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?

Two sentences, front-loaded with the core purpose and ordering, with no wasted words. The trailing endpoint reference is compact and informative.

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 simple one-parameter read-only list tool with no output schema, the description covers what is returned and in what order. A note about pagination (common on list endpoints) would make it fully complete, but nothing essential to invoking the tool is missing.

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 100% and the single 'id' parameter is fully documented in the schema (e.g., 'pay_...'). The description adds no syntax or format details beyond what the schema already provides, so the baseline 3 applies.

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 a specific verb ('List') and resource ('actions ... associated with a payment') and enumerates the action types (authorization, capture, refund, void), making the tool's scope immediately clear and distinguishable from checkout_get_payment. It could name siblings explicitly, but the resource-scoping alone separates it from the other payment tools.

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 implies usage (auditing/retrieving the action history for a given payment) via 'associated with a payment, latest first,' but gives no explicit when-to-use or when-not-to-use guidance, and does not name an alternative such as checkout_get_payment. Usage is inferable but not directed.

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