get_douyin_download_link

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

With no annotations, the description carries the full behavioral burden. It does disclose one genuinely useful trait — an automatic browser-based fallback when HTTP fails, implying possible latency/side effects — but says nothing about auth requirements, rate limits, or reliability beyond that single clause.

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 compact clauses with no filler, and the fallback behavior is stated crisply. It is efficient, though it errs toward under-specification rather than being over-long.

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?

The output schema covers return values, so that need not be described, and the tool is a single-parameter call. However, with no annotations, no parameter documentation, and three adjacent Douyin sibling tools, the description is too thin to reliably route the agent to the correct tool.

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 0% for the single required share_link parameter, and the description adds no format, example, or accepted-link-shape detail. Only the parameter's self-evident name carries meaning.

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 name promises a download link, but the description only says it parses a Douyin link (解析抖音链接), which is vaguer than the tool's actual name and fails to differentiate from the nearby siblings parse_douyin_video_info and extract_douyin_text. An agent cannot tell which Douyin-parsing tool actually returns a downloadable link.

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?

There is no guidance on when to use this tool versus the three sibling Douyin tools, nor any preconditions stated. The only conditional mentioned (HTTP failure fallback) is internal behavior, not a selection criterion for the agent.

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