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get_file_details

Retrieve detailed information about a specific file within the OSRS MCP Server's data directory by providing the filename, enabling efficient access to game-related data.

Instructions

Get details about a file in the data directory.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
filenameYesThe filename to get details for in the data directory

Implementation Reference

  • The core handler function that implements the logic for the 'get_file_details' tool, retrieving file existence, size, line count, and modification timestamps.
    function getFileDetails(filename: string): any {
        try {
            const filePath = path.join(DATA_DIR, filename);
            if (!fs.existsSync(filePath)) {
                return { exists: false };
            }
    
            const stats = fs.statSync(filePath);
            const lineCount = getFileLineCount(filePath);
    
            return {
                exists: true,
                size: stats.size,
                lineCount,
                created: stats.birthtime,
                lastModified: stats.mtime
            };
        } catch (error) {
            console.error(`Error getting file details for ${filename}:`, error);
            return { exists: false, error: 'Error getting file details' };
        }
    }
  • Zod schema defining the input validation for the 'get_file_details' tool (filename parameter).
    const FileDetailsSchema = z.object({
        filename: z.string().describe("The filename to get details for in the data directory")
    });
  • index.ts:328-332 (registration)
    Registration of the 'get_file_details' tool in the MCP server's listTools response.
    {
        name: "get_file_details",
        description: "Get details about a file in the data directory.",
        inputSchema: convertZodToJsonSchema(FileDetailsSchema),
    },
  • Dispatch handler in the CallToolRequestSchema that validates input, performs security checks, calls getFileDetails, and formats the response.
    case "get_file_details":
        const { filename: detailsFilename } = FileDetailsSchema.parse(args);
        
        // Security check to prevent directory traversal
        if (detailsFilename.includes('..') || detailsFilename.includes('/') || detailsFilename.includes('\\')) {
            throw new Error('Invalid filename');
        }
        
        const details = getFileDetails(detailsFilename);
        return responseToString(details);
  • Helper utility function used by getFileDetails to compute the line count of the file.
    function getFileLineCount(filePath: string): number {
        try {
            const content = fs.readFileSync(filePath, 'utf8');
            return content.split('\n').length;
        } catch (error) {
            console.error(`Error counting lines in ${filePath}:`, error);
            return 0;
        }
    }
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool retrieves details but doesn't specify what details are returned, error handling, or any constraints like file size limits or permissions required. This leaves significant gaps for a tool that presumably reads file metadata.

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, clearly front-loading the core purpose. It's appropriately sized for a simple tool with one parameter.

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?

Given no annotations and no output schema, the description is incomplete. It doesn't explain what 'details' include (e.g., metadata, content, size), return format, or potential errors, which is inadequate for a tool that likely returns structured data about files.

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 documents the 'filename' parameter fully. The description adds no additional meaning beyond what the schema provides, such as file format expectations or path handling, meeting the baseline 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 action ('Get details about') and resource ('a file in the data directory'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'list_data_files' or 'search_data_file', 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?

No guidance is provided on when to use this tool versus alternatives like 'search_data_file' or 'list_data_files'. The description implies usage for retrieving details of a specific file, but lacks explicit context or exclusions.

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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