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

Since no annotations are provided, the description must fully disclose behavioral traits. It does not mention pagination, return format, authentication needs, rate limits, or side effects. The only behavioral detail (max_id for pagination) is in the schema, not the description.

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 under-specified ('Reels using Song') rather than concise. It is too short to convey any useful information and does not meet the standard of every sentence earning 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?

The tool has a required audio_id parameter, pagination, and likely returns a list of reels, but the two-word description gives no context about expected results, use cases, or relationship to sibling tools. No output schema or annotations exist to compensate, making the description completely inadequate.

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% with both max_id and audio_id documented. The description adds no parameter meaning, but the baseline of 3 applies when the schema carries the full parameter weight.

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 'Reels using Song' is a noun phrase lacking an explicit verb or action. It vaguely indicates that the tool retrieves reels associated with a song, but doesn't specify the operation (e.g., scrape, list, search) or platform, and does not distinguish it from siblings like scrapecreators_tiktoks_using_song.

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?

No guidance is provided on when to use this tool versus alternatives. The description does not mention any context, prerequisites, or exclusions, leaving the agent with no information about which sibling tool fits a given scenario.

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