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

Annotations declare readOnlyHint=false and destructiveHint=false, so the agent knows this mutates state without destroying data, and the description usefully adds the auth precondition. What it omits is the key trait of an 'init' tool: that it establishes server-side inquiry state consumed by the page/result siblings, whether re-calling resets it, and how long that state lives.

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, no filler, with the hard requirement front-loaded in caps so the precondition is read first. Every sentence earns its place.

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 state-initializing tool with full parameter documentation, annotations covering the safety profile, and no output schema, the definition is close to sufficient. The remaining gap is the lifecycle relationship to payments__page/__result, which an agent needs to chain the calls correctly.

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 schema already explains date formats, the UUID form, and the auto-resolution behavior of account_link_id. The description adds no parameter-level meaning beyond that, 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?

States a specific verb ('Initialize'), resource ('KB Biz Card payments inquiry') and scope ('for a date range'), which is far better than a tautology. However it never differentiates itself from the sibling workflow tools kb_biz_card__payments__page/__result/__search, so an agent cannot tell from the description alone where this sits in the sequence.

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?

Gives an explicit prerequisite in caps: a prior kb_biz_card__session__login call with the same account_link_id. That is genuine when-to-use context. It stops short of naming when NOT to use it or pointing to the follow-on calls (page/result) that consume this initialization.

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