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109naoki

minimal-mcp-server

by 109naoki

get-current-time

Retrieve the current date and time from the minimal MCP server to display accurate temporal information for applications or systems requiring time synchronization.

Instructions

現在の日時を取得するツール

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The tool 'get-current-time' is registered and implemented directly in src/index.ts. The handler logic is provided as an async callback within the registerTool function.
    server.registerTool(
      "get-current-time",
      {
        description: "現在の日時を取得するツール",
      },
      async () => {
        const now = new Date();
        return {
          content: [
            {
              type: "text",
              text: `現在の日時: ${now.toLocaleString()}`,
            },
          ],
        };
      },
    );
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It fails to specify the return format (ISO string, timestamp, etc.), timezone handling (UTC vs local), or safety characteristics (read-only nature). Only the basic function is stated.

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?

The description is a single efficient sentence with zero waste. It is appropriately front-loaded with the core purpose immediately stated. No redundant or unnecessary text is present.

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

Completeness3/5

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

Given the tool's simplicity (zero parameters) and lack of output schema, the description is minimally viable but incomplete. It omits critical runtime context such as timezone, precision, and return value structure that would be necessary for robust agent operation without trial-and-error.

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

Parameters4/5

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

The input schema contains zero parameters (empty object). According to the evaluation rules, 0 parameters establishes a baseline score of 4. No parameter description is necessary or expected.

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?

The description clearly states the specific action (取得する/get) and resource (現在の日時/current date and time). It effectively distinguishes from siblings 'echo' and 'search-wikipedia' which operate on completely different domains. However, it lacks scope specification (timezone, format) which prevents a perfect score.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. While siblings are clearly distinct (echo, search-wikipedia), there is no explicit context about when retrieving current time is appropriate or necessary prerequisites.

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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