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kalivaraprasad-gonapa

https://github.com/Streen9/react-mcp

read-file

Extract file contents by specifying the file path within React applications. Simplifies file reading in the react-mcp server to enhance app development workflows.

Instructions

Read the contents of a file

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
filePathYesPath to the file to read

Implementation Reference

  • The main execution handler for the 'read-file' tool. Validates input, checks file existence, reads content with fs.readFileSync, and returns file details.
    async function handleReadFile(params) {
      try {
        const { filePath } = params;
    
        if (!filePath) {
          throw new Error("File path is required");
        }
    
        // Check if file exists
        if (!fs.existsSync(filePath)) {
          throw new Error(`File ${filePath} does not exist`);
        }
    
        // Read file content
        const content = fs.readFileSync(filePath, "utf8");
    
        return {
          filePath: filePath,
          content: content,
          size: Buffer.byteLength(content, "utf8"),
        };
      } catch (error) {
        return {
          error: `Error reading file: ${error.message}`,
        };
      }
    }
  • Zod schema defining the input parameters for the 'read-file' tool: requires 'filePath' as string.
    const ReadFileSchema = z.object({
      filePath: z.string(),
    });
  • index.js:582-595 (registration)
    Tool registration in the listTools handler, providing name, description, and input schema for 'read-file'.
    {
      name: "read-file",
      description: "Read the contents of a file",
      inputSchema: {
        type: "object",
        properties: {
          filePath: {
            type: "string",
            description: "Path to the file to read",
          },
        },
        required: ["filePath"],
      },
    },
  • index.js:669-672 (registration)
    Dispatch case in the CallToolRequestSchema handler that parses arguments with ReadFileSchema and invokes the handleReadFile function.
    case "read-file":
      const readArgs = ReadFileSchema.parse(args);
      result = await handleReadFile(readArgs);
      break;
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 states the action ('Read') but doesn't mention potential side effects (e.g., file locking, permissions required, error handling for missing files, or character encoding issues). For a file operation tool with zero annotation coverage, this leaves significant gaps in understanding how the tool behaves in practice.

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, clear sentence that efficiently conveys the core functionality without any wasted words. It is front-loaded with the essential action and resource, making it immediately scannable and easy to understand. Every part of the sentence earns its place by directly contributing to the tool's purpose.

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 low complexity (single parameter, no output schema, no annotations), the description is minimally adequate. It covers the basic action but lacks details on behavioral aspects like error conditions or return formats. Without annotations or an output schema, the agent must rely on the description alone, which is insufficient for fully informed usage but meets the bare minimum for a simple read operation.

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 description adds no parameter-specific information beyond what the input schema already provides. Since schema description coverage is 100% (the 'filePath' parameter is fully documented in the schema), the baseline score of 3 applies. The description doesn't compensate with additional context like path format examples or constraints, but it doesn't need to given the schema's completeness.

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 action ('Read') and the target resource ('contents of a file'), making the purpose immediately understandable. It doesn't differentiate from the sibling tool 'install-package', but since these tools serve completely different domains (file operations vs package management), explicit differentiation isn't necessary for clarity. The description avoids tautology by specifying what is being read rather than just restating the tool name.

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 or in what context it should be applied. While the sibling tool 'install-package' is unrelated, there's no mention of prerequisites, file system constraints, or typical use cases. The agent must infer usage purely from the tool name and description without explicit direction.

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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