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

The description goes well beyond the annotations by disclosing critical behaviors: '认领不可撤销' (irreversible), '只插不覆盖' (only insert, never overwrite), 'accept 必须显式传 true', and the state change to '已认领' for the organization. It also explains the canFill=false condition and filledCount behavior, providing detailed insight into side effects and idempotency nuances.

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 structured with clear sections (【需要登录】【组合链】【口径/坑】) and every sentence adds value—login requirement, confirmation necessity, purpose, chain, and pitfalls. It is longer than a simple one-liner, but the density is justified by the complexity of the operation. Minor redundancy: the title and opening sentence both express the core action.

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 description covers prerequisites (login, user confirmation), the work flow, edge cases (canFill=false, filledCount < fieldKeys length), and state changes. It omits explicit error handling or empty array behavior, but given the openWorldHint and schema constraints, an agent can reasonably infer these. The output is not described, but since no output schema exists, the mention of filledCount provides a partial hint.

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?

With only 33% schema coverage, the description partially compensates: it explains 'accept' must be explicitly true, and 'fieldKeys' should be passed all at once. It also references canFill=false which relates to field-level constraints. However, it doesn't elaborate on the individual enum values or the exact structure of fieldKeys, though those are self-explanatory in the schema.

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+resource: '把一条待认领资料里选中的字段一次性回填进我的报名资料层' (claim and backfill selected fields into my signup profile). It clearly differentiates from siblings like list_my_organization_claims and dismiss_organization_claim by naming the action and its role in the combination chain.

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 clear combination chain (list_my_organization_claims → this tool → get_signup_gaps → submit_signup) indicating when to use it. It also contrasts with the App's manual step-by-step confirmation, framing this tool as the batch alternative. It doesn't explicitly exclude other update tools, but the context and chain make the usage situation clear.

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