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

Annotations only supply generic mutable/non-idempotent flags, while the description adds substantive behavior: a human follow-up contact after submission, no immediate account provisioning, and the fact that the call does not consume trial quota. The one gap is that it never warns that repeat calls create duplicate applications, despite idempotentHint=false.

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 core action, then the consent precondition, then post-submission consequences; every sentence carries information. It reads as one dense run-on block and could be split for scanability, but nothing is filler.

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?

With three flat parameters, no output schema, and thin annotations, the description covers what an agent needs: prerequisites, refusal condition, and the outcome after submission. It stops short of describing the actual response payload, which would fully close the loop absent an output schema.

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 percent, so the baseline is 3, but the description genuinely adds meaning: the contact value must come from the user rather than be inferred, and consent must be true only after explicit agreement. Minor overlap with the schema wording keeps it from a 5.

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 plus resource: submit an onboarding/access application (入驻申请) for 七喵空间 on the user's behalf. It is unmistakably different from the read-only siblings about_meowspace and get_public_spark_chart, and it also clarifies the key negative: no account is created on the spot.

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?

Explicit preconditions and an explicit prohibition: collect a phone or email from the user personally (do not guess or fill in for them), obtain explicit consent to the privacy policy, and do not call the tool at all if that consent is absent. This is a textbook when-to-use / when-not-to-use statement.

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