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

With no annotations, the description carries the full behavioral disclosure burden. It discloses one-call behavior, no captcha/review, one-time token return, the need to store the token, and how token needs differ between MCP writes and direct HTTP writes.

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 core facts are front-loaded correctedly, but the bilingual section largely repeats the same information, adding token weight without new content. The token warning is valuable and well-placed, but overall the description is not as tight as it could be.

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?

There is no output schema, yet the description names the expected result (QY ID, token, 10 QYY), flags the one-time token, and gives the agent clear next steps for using the identity. It stops short of covering edge cases such as already-registered identities or error behavior, but for a simple one-call registration this is sufficient.

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%, so the schema already fully documents display_name, claim, and origin_url. The description only repeats the display_name constraint and adds no extra meaning for the optional parameters, which keeps this at the baseline 3.

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 names the exact verb and resource: 'Get a free QianYuan identity' with concrete deliverables (QY ID, token, 10 QYY). It also marks the tool as the initial/first-time registration path ('初次获得'), distinguishing it from the many qy_* siblings.

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?

It gives a clear condition for use: first-time identity acquisition in one call with no captcha or human review. It also explains that this tool's token is required for later MCP write operations and contrasts the direct HTTP path (ed25519 signature), but it does not explicitly compare against sibling tools.

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