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

Adds substantial context beyond the annotations: the operation is irreversible, requires login, and returns ok=false with a specific error taxonomy (invalid/not_found/claimed/self) plus retry guidance. The only blemish is a mild tension between '不可逆' and destructiveHint=false, and it does not say what happens to the underlying placeholder owner's data or the exact auth identity required beyond 'login'.

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 the login requirement and the core action, then brackets the error handling and workflow chain. Dense and mostly waste-free, though the bracketed shorthand and mixed encoding make it slightly harder to parse than plain prose.

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 two-param mutation with no output schema, the description covers the prerequisite, the irreversible effect, the partial response shape (ok=false cases), and the surrounding workflow. What is missing is what success returns and what permissions/identity the caller must hold beyond being logged in.

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%: token ('邮件链接 ?ct=<token>') and creatorId ('邮件链接 /u/<creatorId>') are both fully documented in the schema. The description only reinforces the email/token origin ('邮件ct token') and adds no format or validation detail beyond the schema, 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+resource ('不可逆认领整份占位主理人资料/产品/会话' by email ct token) and explicitly scopes it as NOT a single product code, which separates it from the sibling claim_product. An agent can tell what it does and how it differs from neighbouring claim tools without opening any schema.

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 a hard prerequisite ('需要登录'), an explicit workflow chain (确认身份/token来源→认领→get_my_card), and a retry warning ('勿盲重试'). It differentiates from claim_product via '非单产品码', but does not spell out when to prefer it over claim_organization_profile or other claim routes, so it stops just short of full when/when-not coverage.

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