set_group_sign

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

No annotations are provided, so the description carries the full burden. It does disclose one behavioral trait beyond the schema: '会留下你的签到记录' tells the agent a persistent sign-in record is created. However, it omits idempotency/repeat-sign behavior, error conditions (e.g., already signed), and auth requirements, which matters for a mutation tool.

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 short sentences with zero filler, and the core action is front-loaded in the first sentence. The second sentence adds a side-effect note that earns its place.

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 one-parameter, no-output-schema mutation, the description covers purpose and the notable side effect (a sign-in record is left behind). It is nearly complete; only repeat-sign behavior and failure modes are unaddressed.

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%, and the schema already documents group_id thoroughly (including 'use get_group_list, don't fill from memory'). The description adds no additional parameter meaning, so the 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: check in / sign in (打卡签到) to a specified group. Among the sibling set, it is the only signing tool, so an agent can identify it without ambiguity. It stops short of explicitly contrasting with related set_group_* siblings, but the action itself is unambiguous.

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 implies the usage context (signing in to a group chat) but gives no explicit when-to-use/when-not guidance, prerequisites, or alternatives. For a single-purpose tool this is minimally adequate, but the agent must infer that this is a daily check-in style action rather than an arbitrary write.

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