nanoid

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

With no annotations, the description carries the burden of transparency. It discloses key behavioral traits: IDs are compact, URL-safe, and customizable in length and alphabet. It does not detail randomness source or potential side effects, but for a simple generation tool this is reasonable.

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 core description is a single concise sentence that efficiently conveys purpose. However, the promotional prefix '[PRO — 3 trial uses left]' is extraneous and not tool-related, slightly detracting from structural cleanliness.

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 is simple with full schema documentation, and the description adequately explains what it does and its customization options. Though the 'count' parameter is not mentioned in the text, the schema covers it, making the overall description complete.

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?

All three parameters have descriptions in the schema, and the description reinforces length and alphabet customization. Since the schema already covers parameter meaning at 100%, the description adds marginal semantic value beyond that.

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 'Generate compact, URL-safe unique IDs' with a specific verb and resource, and differentiates from the sibling 'uuid' tool by noting 'like UUID but shorter'. This makes the tool's purpose unambiguous.

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 phrasing 'like UUID but shorter' provides a clear use case comparison, implying when to use this over a standard UUID generator. However, it does not explicitly mention alternatives or state when not to use the tool, so it falls short of full guidance.

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