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DillyDallyMCP

by DIodide

add_integers

Calculate the sum of two integers by providing both numbers as input to get their total value.

Instructions

Adds two integers together

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
aYesFirst integer
bYesSecond integer

Implementation Reference

  • The handler function that implements the core logic of the add_integers tool: validates input arguments, adds two numbers, and returns the result or error.
    export async function handleAddIntegers(
      args: unknown
    ): Promise<CallToolResult> {
      if (!args || typeof args !== "object") {
        return {
          content: [
            {
              type: "text",
              text: "Error: Arguments must be an object",
            },
          ],
          isError: true,
        };
      }
    
      const { a, b } = args as { a?: unknown; b?: unknown };
    
      if (typeof a !== "number" || typeof b !== "number") {
        return {
          content: [
            {
              type: "text",
              text: "Error: Both a and b must be numbers",
            },
          ],
          isError: true,
        };
      }
    
      const result = a + b;
    
      return {
        content: [
          {
            type: "text",
            text: `Result: ${result}`,
          },
        ],
        isError: false,
      };
    }
  • The tool definition object specifying the name, description, and input schema (parameters a and b as numbers).
    export const addIntegersToolDefinition: Tool = {
      name: "add_integers",
      description: "Adds two integers together",
      inputSchema: {
        type: "object",
        properties: {
          a: {
            type: "number",
            description: "First integer",
          },
          b: {
            type: "number",
            description: "Second integer",
          },
        },
        required: ["a", "b"],
      },
    };
  • tools/index.ts:68-72 (registration)
    The registration of the add_integers tool in the central toolRegistry Map, linking its definition and handler.
    "add_integers",
    {
      definition: addIntegersToolDefinition,
      handler: handleAddIntegers,
    },
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 only states the basic operation without mentioning error handling, performance characteristics, or any behavioral traits like overflow handling or precision limitations.

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 perfectly concise with a single, clear sentence that communicates the core functionality without any unnecessary words. It's appropriately sized for this simple tool.

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?

For a simple mathematical tool with no annotations and no output schema, the description adequately covers the basic operation but lacks information about return values, error cases, or behavioral context that would be helpful for an AI agent.

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%, so the schema already fully documents both parameters. The description doesn't add any meaning beyond what the schema provides, maintaining the baseline score for high schema coverage.

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 tool's purpose with a specific verb ('adds') and resource ('two integers'), making it immediately understandable. It doesn't need to distinguish from siblings since none exist, but it could be more specific about the mathematical operation context.

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?

No guidance is provided about when to use this tool versus alternatives or in what context it's appropriate. The description simply states what it does without any usage context, prerequisites, or limitations.

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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