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JojoSlice

README Generator MCP Server

by JojoSlice

read_file

Read file contents to analyze project structures and generate comprehensive README documentation with proper formatting and sections.

Instructions

Read the contents of a file

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesThe absolute path to the file to read

Implementation Reference

  • The handler function for the 'read_file' tool. It extracts the file path from arguments, reads the file content using Node.js fs/promises.readFile, and returns it formatted as MCP tool content response (text type).
    case "read_file": {
      const { path } = args as { path: string };
      const content = await readFile(path, "utf-8");
      return {
        content: [
          {
            type: "text",
            text: content,
          },
        ],
      };
    }
  • src/index.ts:410-423 (registration)
    The registration of the 'read_file' tool in the ListToolsRequestSchema handler. Defines the tool name, description, and input schema (requiring a 'path' string parameter).
    {
      name: "read_file",
      description: "Read the contents of a file",
      inputSchema: {
        type: "object",
        properties: {
          path: {
            type: "string",
            description: "The absolute path to the file to read",
          },
        },
        required: ["path"],
      },
    },
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. While 'Read' implies a read-only operation, it doesn't specify permissions required, file size limits, encoding handling, error conditions, or what happens with binary files. This leaves significant gaps for a tool that interacts with the filesystem.

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 at just 5 words: 'Read the contents of a file'. Every word earns its place, with no wasted language or unnecessary elaboration. It's front-loaded with the core action and resource.

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

Completeness2/5

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

For a filesystem tool with no annotations and no output schema, the description is insufficient. It doesn't address critical context like return format (text, binary, encoding), error handling, permissions, or limitations. The agent would need to guess about important behavioral aspects of file reading.

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?

The schema description coverage is 100%, with the single parameter 'path' clearly documented in the schema as 'The absolute path to the file to read'. The description adds no additional parameter information beyond what's already in the schema, so the baseline score of 3 is appropriate.

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 verb ('Read') and resource ('contents of a file'), making the purpose immediately understandable. It doesn't specifically differentiate from sibling tools like 'read_project_structure' or 'analyze_project', but the action is unambiguous for a file-reading operation.

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 like 'read_project_structure' or 'analyze_project'. It doesn't mention any prerequisites, limitations, or specific contexts where this tool is preferred over other file-related operations.

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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