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

Discloses API key requirement for follow/unfollow, but lacks other behavioral context (e.g., rate limits, side effects, data returned). No annotations provided, so description carries full burden.

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 sentences, efficient and front-loaded. First sentence lists actions clearly, second adds key constraint. Could be slightly more structured but no waste.

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?

Adequate for a multi-action tool with no output schema or annotations. Missing details on return values, user_id usage, and per-action parameters, but covers core actions.

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 covers 100% of parameters with descriptions; description adds minimal value beyond stating API key requirement, which is already in schema. 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?

Description clearly states actions: browse top posters, user profile, follow/unfollow. Differentiates from siblings like browse_posts by focusing on users, but does not explicitly distinguish from other user-related tools.

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?

Implied usage for user browsing and follow/unfollow, but no explicit when-to-use or when-not-to-use guidance. No alternatives mentioned despite 24 sibling tools.

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