OSRS MCP Server

Instructions

Implementation Reference

• index.ts:431-455 (handler)

  Shared handler logic for search_varptypes and other search_* tools: parses arguments using FileSearchSchema, derives filename 'varptypes.txt', checks existence, invokes searchFile helper with pagination, and returns formatted results.
  case "search_varptypes": case "search_varbittypes": case "search_iftypes": case "search_invtypes": case "search_loctypes": case "search_npctypes": case "search_objtypes": case "search_rowtypes": case "search_seqtypes": case "search_soundtypes": case "search_spottypes": case "search_spritetypes": case "search_tabletypes": const fileSearchArgs = getSchemaForTool(name).parse(args) as { query: string; page?: number; pageSize?: number }; const { query, page: filePage = 1, pageSize: filePageSize = 10 } = fileSearchArgs; const filename = `${name.replace('search_', '')}.txt`; const filePath = path.join(getDataDir(), filename); if (!fileExists(filename)) { return responseToString({ error: `${filename} not found in data directory` }); } const fileResults = await searchFile(filePath, query, filePage, filePageSize); return responseToString(fileResults);
• index.ts:52-56 (schema)

  Zod schema used for input validation of search_varptypes tool calls, defining query, page, and pageSize parameters.
  const FileSearchSchema = z.object({ query: z.string().describe("The term to search for in the file"), page: z.number().int().min(1).optional().default(1).describe("Page number for pagination"), pageSize: z.number().int().min(1).max(100).optional().default(10).describe("Number of results per page") });
• index.ts:313-316 (registration)

  Tool registration entry in getToolDefinitions() function, returned by listTools, providing name and description.
  { name: "search_varptypes", description: "Search the varptypes.txt file for player variables (varps) that store player state and progress.", },
• index.ts:102-168 (helper)

  Primary helper function implementing file search logic: reads file line-by-line, performs case-insensitive matching (with space-to-underscore normalization), extracts ID-value pairs, applies pagination, and structures results.
  async function searchFile(filePath: string, searchTerm: string, page: number = 1, pageSize: number = 10): Promise<any> { //replace spaces with underscores searchTerm = searchTerm.replace(" ", "_"); return new Promise((resolve, reject) => { if (!fs.existsSync(filePath)) { reject(new Error(`File not found: ${filePath}`)); return; } const results: {line: string, lineNumber: number}[] = []; const fileStream = fs.createReadStream(filePath); const rl = readline.createInterface({ input: fileStream, crlfDelay: Infinity }); let lineNumber = 0; rl.on('line', (line) => { lineNumber++; if (line.toLowerCase().includes(searchTerm.toLowerCase())) { results.push({ line, lineNumber }); } }); rl.on('close', () => { const totalResults = results.length; const totalPages = Math.ceil(totalResults / pageSize); const startIndex = (page - 1) * pageSize; const endIndex = startIndex + pageSize; const paginatedResults = results.slice(startIndex, endIndex); // Process the results to extract key-value pairs if possible const formattedResults = paginatedResults.map(result => { // Try to format as key-value pair (common for ID data files) const parts = result.line.split(/\s+/); if (parts.length >= 2) { const id = parts[0]; const value = parts.slice(1).join(' '); return { ...result, id, value, formatted: `${id}\t${value}` }; } return result; }); resolve({ results: formattedResults, pagination: { page, pageSize, totalResults, totalPages, hasNextPage: page < totalPages, hasPreviousPage: page > 1 } }); }); rl.on('error', (err) => { reject(err); }); }); }
• index.ts:291-294 (helper)

  Schema selection logic in getSchemaForTool() that maps search_varptypes to FileSearchSchema for input validation.
  if (toolName.startsWith("search_")) { return FileSearchSchema; } throw new Error(`Unknown tool: ${toolName}`);