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devutils-mcp-server

generate_nanoid

Create compact, URL-friendly unique identifiers for applications requiring reliable ID generation with customizable length and quantity.

Instructions

Generate a NanoID — a compact, URL-friendly unique ID.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
lengthNoLength of the NanoID (1-128, default: 21)
countNoNumber of IDs to generate (1-100, default: 1)

Implementation Reference

  • Handler function for generating NanoID, utilizing the nanoid library.
    async ({ length, count }) => {
      const ids = Array.from({ length: count }, () => nanoid(length));
      return {
        content: [{ type: "text" as const, text: ids.join("\n") }],
      };
    }
  • Input validation schema using Zod for length and count parameters of the NanoID tool.
    {
      length: z
        .number()
        .int()
        .min(1)
        .max(128)
        .default(21)
        .describe("Length of the NanoID (1-128, default: 21)"),
      count: z
        .number()
        .int()
        .min(1)
        .max(100)
        .default(1)
        .describe("Number of IDs to generate (1-100, default: 1)"),
    },
  • Registration of the 'generate_nanoid' tool within the McpServer instance.
    server.tool(
      "generate_nanoid",
      "Generate a NanoID — a compact, URL-friendly unique ID.",
      {
        length: z
          .number()
          .int()
          .min(1)
          .max(128)
          .default(21)
          .describe("Length of the NanoID (1-128, default: 21)"),
        count: z
          .number()
          .int()
          .min(1)
          .max(100)
          .default(1)
          .describe("Number of IDs to generate (1-100, default: 1)"),
      },
      async ({ length, count }) => {
        const ids = Array.from({ length: count }, () => nanoid(length));
        return {
          content: [{ type: "text" as const, text: ids.join("\n") }],
        };
      }
    );
Behavior3/5

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

With no annotations provided, the description carries the full disclosure burden. It adds useful behavioral context by stating the output is 'unique' and 'URL-friendly', but omits critical operational details like return format (string vs array), cryptographic safety, or collision probability that agents need when annotations are absent.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Extremely efficient two-clause structure with zero redundancy. Every word earns its place—'compact' and 'URL-friendly' simultaneously describe the output and differentiate from siblings. Front-loaded with the action verb.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Appropriately complete for a simple two-parameter utility with full schema coverage. The description adequately characterizes the NanoID concept for unfamiliar users. Minor gap: lacks return value description given the absence of an output schema, though the tool name makes this largely inferable.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, establishing a baseline of 3. The description does not mention parameters 'length' or 'count', nor does it add semantic context (e.g., explaining that length affects collision probability) beyond the schema's mechanical descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States specific verb 'Generate' and resource 'NanoID', and describes distinguishing characteristics ('compact, URL-friendly') that differentiate it from the 'generate_uuid' sibling. However, it lacks explicit comparative guidance stating when to prefer this over UUIDs or other ID generators.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides implied usage guidance through the characteristics 'compact' and 'URL-friendly', suggesting when this tool is appropriate (space-constrained or URL contexts). However, it lacks explicit 'when to use/when not to use' statements or named alternative comparisons.

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

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