login

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 discloses the login action and token acquisition, but does not mention error cases (e.g., invalid API key), token expiration, or side effects. For a simple login tool, this is minimally adequate but not rich.

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 that are front-loaded with the core action and outcome. Every word earns its place; no filler or repetition.

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 login tool with no output schema, the description covers purpose, outcome (token), and usage context. It would benefit from noting that the token must be used in subsequent requests, but the phrase 'first step' implicitly conveys this.

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?

The input schema already fully documents apiKey with format and generation source (100% coverage). The description only restates that an API key is used, adding no new parameter-specific information. Baseline 3 is appropriate.

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 clearly states the tool's action: login with an API Key to obtain an authentication Token. It uses a specific verb ('登录') and resource ('API Key'), and distinguishes itself from sibling tools (add_item, query_items, etc.) by positioning as the required first step.

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?

Explicitly states that this is the first step before using other tools ('这是使用其他工具前的第一步'), providing clear context for when to use it. Although no alternatives are mentioned, the guidance is unambiguous and sufficient for the tool's role.

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