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

Annotations are not informative (readOnlyHint=false, destructiveHint=false), so the description carries the behavioral burden. It contributes an auth-related context by requiring a prior login with the same account_link_id, and implies stateful initialization. However, it does not disclose side effects, whether repeated calls reset state, or what the initialization actually changes.

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?

A single sentence that front-loads the most critical constraint (login requirement) and then states the tool's purpose. Every word earns its place; there is no redundant or filler content.

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?

There is no output schema, and the description does not explain what the init call returns or how it feeds into the payment inquiry flow (e.g., subsequent payments__page or payments__result calls). While the prerequisite is helpful, an agent navigating this stateful multi-step flow is left to infer the next steps and side effects.

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%, so the schema already documents all three parameters. The description adds only a general date-range reference and ties account_link_id to the login prerequisite, but it does not add meaning beyond what the schema provides, matching the baseline.

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 action — 'Initialize KB Biz Card payments inquiry for a date range' — with a clear resource (payments inquiry) and scope (date range). It is clear enough to distinguish from the payments page/result/search siblings, though it does not explicitly name or contrast them.

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 gives a clear usage prerequisite: a prior kb_biz_card__session__login call with the same account_link_id. This tells the agent when the tool can be invoked, but it does not explicitly state when to prefer this over payments__search or what to call after initialization.

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