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The service maps HTML elements to Markdown equivalents and applies configurable rules for handling edge cases. 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Each tool (fetch_html, fetch_json, fetch_txt, fetch_markdown) has a corresponding Zod schema that validates URL format, header structure, and required fields. Invalid requests are rejected with structured error messages before reaching the fetcher logic, preventing malformed requests from consuming resources.","intents":["I want to ensure all tool requests are properly formatted before processing","I need to validate URL format and header structure at the MCP server level","I want to provide clear error messages for malformed requests"],"best_for":["MCP server developers building robust tool interfaces","Teams needing strict input validation before resource-intensive operations","Applications requiring type-safe tool calling"],"limitations":["Zod validation adds ~5-10ms latency per request","Schema definitions must be maintained separately from tool implementations","No automatic schema generation from TypeScript types — manual definition required","Error messages are Zod-formatted strings, not structured validation errors","No support for conditional validation (e.g., different schemas based on URL domain)"],"requires":["Zod library installed","Schema definitions for each tool","TypeScript or JavaScript runtime"],"input_types":["Tool request object with url and optional headers"],"output_types":["Validated request object if valid","Error message string if validation fails"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-zcaceres-fetch-mcp__cap_6","uri":"capability://tool.use.integration.tool.registration.and.mcp.protocol.handler.binding","name":"tool registration and mcp protocol handler binding","description":"Registers four tools (fetch_html, fetch_json, fetch_txt, fetch_markdown) with the MCP SDK and binds request handlers to each tool. The server implements the MCP tool listing protocol (returning tool schemas) and tool calling protocol (executing tools and returning results). 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Errors include descriptive messages indicating the failure type (network error, invalid URL, parsing failure, etc.) without exposing internal stack traces. 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