cx_s_sign_in

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

No annotations are provided, so the description must carry the full behavioral transparency burden. It only labels the sign-in modes and does not disclose side effects, such as recording attendance, authentication requirements, failure behavior, or whether sign-in can be repeated or reversed.

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 a single compact sentence with the action front-loaded and the mode list in parentheses. There is no filler, repetition, or unnecessary detail, making it easy for an agent to parse quickly.

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?

Given seven parameters, zero schema description coverage, no annotations, and no enums, the description is too brief to fully support correct invocation. An agent would still need to infer conditional requirements, such as when code, latitude, longitude, or photoPath must be supplied for each mode.

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 0%, so the description is the main source of parameter meaning. It helps by mapping the signinType values to real-world modes: normal (one-click), location, code, and photo, which naturally hints at which parameters are relevant for each mode. It does not explicitly map modes to required parameters, but it adds significant meaning beyond the bare 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 and resource: '学生签到' (student sign-in), and lists the four distinct sign-in modes: normal, location, code, and photo. This makes the tool's purpose immediately clear and distinguishes it from the sibling tools related to courses, homework, exams, and materials.

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 clearly implies the tool is used when a student needs to sign in to an activity, and the mode list gives some usage context. However, it does not explicitly say when each mode should be chosen, nor does it name alternatives or exclusions, such as prerequisites like needing an activityId.

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