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

Adds substantial behavior beyond annotations: login required, the claim is irreversible, values must be read back to the user for confirmation, insert-only semantics (existing canFill=false fields are untouched, so filledCount may be < fieldKeys length), the post-claim state change, and accept must be explicitly true. These are consistent with destructiveHint=true and idempotentHint=true, so no contradiction.

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?

Front-loaded with purpose and the login/irreversibility warning, then organized into labeled sections (组合链, 口径/坑) with no filler sentences. It is dense, but every clause carries operational information.

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 destructive, cross-form write tool with no output schema, the description still covers auth, irreversibility, the surrounding workflow, parameter requirements, and the shape of the outcome (filledCount vs fieldKeys length). Nothing an agent needs to invoke it correctly 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 coverage is low (33%), so the description must compensate, and it does: contactId is the id from list_my_organization_claims, accept must be explicitly true, and fieldKeys is passed all-at-once with insert-only behavior relative to canFill. It does not spell out individual enum field meanings or the maxItems=11, leaving a small gap.

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: claim a to-be-claimed profile and one-shot backfill the selected fields into the signup profile layer (cross-form reuse). It also draws the boundary against the sibling list_my_organization_claims, which supplies the id/fields, so an agent can tell the two apart.

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 【组合链】 block gives an explicit workflow: list_my_organization_claims → this tool's fieldKeys (all at once) → get_signup_gaps → submit_signup, which clearly positions when to call it. It stops short of an explicit when-not-to-use or exclusion, so it is clear context rather than a full rule set.

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