douyin_browser_login_start

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

With no annotations, the description carries full burden. It discloses that it opens a visible browser and requires QR code scanning. However, it lacks details on error handling, what happens if already logged in, side effects, or authentication requirements beyond scanning. More behavioral context is needed.

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 that conveys the core purpose and usage condition without waste. It is front-loaded and every part 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?

Given zero parameters and an output schema, the description is minimal. It does not explain what 'confirming platform risk' entails, specify prerequisites, or describe behavior on failure. For a login operation, more context about synchronous/asynchronous nature and expected outcomes would improve completeness.

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?

There are no parameters, so baseline 4 applies. The description adds no parameter info because none exist, and the schema coverage is complete. Nothing to deduct.

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 that the tool opens a visible browser for login after confirming platform risk, and specifies when it is needed (first login or expired login). The resource and verb are specific, and it distinguishes itself from siblings like status checking and data sync.

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 usage scenarios: when first logging in or after login expires, after platform risk confirmation. It does not explicitly state when not to use or mention alternatives like checking login status first, but the context provides a reasonable usage clue.

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