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

Annotations declare readOnlyHint=false and destructiveHint=false, consistent with 'Initialize' setting up session state rather than reading or destroying data. The description adds genuine value the annotations cannot convey: the auth/session prerequisite tied to account_link_id.

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 with no filler, and the hard prerequisite is front-loaded in caps before the purpose statement. Efficient and well-structured, though the second sentence is somewhat generic.

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?

The auth prerequisite is covered, but for an init tool in an init/page/result lifecycle with no output schema, the agent is not told what init actually produces or that page/result must follow. This lifecycle context is the key missing piece for correct invocation.

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 coverage is 100% and all three parameters (date_from, date_to, account_link_id) are documented in the schema, including format and the auto-resolution behavior for account_link_id. The description only restates the date range, adding nothing new, so 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 and resource ('Initialize KB Biz Card purchases inquiry') with the date-range scope. However, four sibling tools exist (purchases__search, purchases__page, purchases__result) and the description does not differentiate this init step from them, leaving an agent to infer the ordering.

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: a prior kb_biz_card__session__login call with the same account_link_id. That is concrete when-to-use guidance. It stops short of telling the agent what to call after this (page/result), so no alternative routing is provided.

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