register_user

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

No annotations are present, so the description must disclose behavioral traits. It implies a mutation (registration) but does not mention permissions, side effects, rate limits, or what happens if the user already exists. The description is minimal and leaves critical behavioral aspects unknown.

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 sentence of 11 words, which is concise but lacks structure and front-loading. It is too terse to be helpful; for example, it does not explain the significance of 'return the user's token' or any ordering of information. The sentence earns its place but underspecifies.

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 the tool has 3 parameters, no output schema, and no annotations, the description is insufficient. It does not explain the return value (token), preconditions, or error scenarios. It fails to provide complete context for the agent to invoke the tool safely and effectively.

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% with each parameter described (user_id, name, portrait_uri). However, the tool description adds no additional meaning beyond the schema, such as parameter relationships or format constraints. Baseline is 3 due to high schema coverage, but no extra value is provided.

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 'Register a new user via RongCloud and return the user's token' clearly states the action (register) and resource (user) with a specific outcome (return token). It distinguishes from sibling tools like 'get_user_info' (retrieval) and 'send_*' (messaging), though it does not explicitly call out those differences.

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 provides no guidance on when to use this tool vs. alternatives, nor does it mention prerequisites or scenarios to avoid. Sibling tools like 'create_group' or 'get_user_info' are related but no comparison is made.

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