Single tool 'get_docs' has a reasonable name and description, but critical implementation issues undermine quality. The tool description (89 chars) is below the 194-char baseline and lacks key details about prerequisites (SERPER_API_KEY required), error modes, and output structure. Input schema is present with types and descriptions, but the implementation contains a fatal bug: variable 'text' is used without initialization in the loop (line 'text += await fetch_url(result["link"])'), causing a NameError at runtime. The tool accepts free-form 'library' strings despite only supporting 3 values, should be an enum. No output schema is documented. Error handling is minimal: ValueError for unsupported library, but no guidance on recovery or handling search failures. The tool makes external API calls (Serper, web scraping) without documented rate limits, timeouts, or retry logic beyond a single timeout catch. No pagination or result limiting despite potentially returning large documents. Security concern: SERPER_API_KEY is injected via environment (good), but the tool does not validate or sanitize the 'query' parameter before passing to Serper API, risking injection attacks.

• Fix the NameError by initializing 'text = ""' before the loop, or better: collect results in a list and join at the end.
• Convert 'library' parameter to an enum: {"type": "string", "enum": ["langchain", "llama-index", "openai"], "description": "The documentation library to search in"}
• Expand tool description to 150-250 chars: explain that it searches official docs via Serper API, requires SERPER_API_KEY env var, returns concatenated text from top 2 results, and is best for finding API references or usage examples.
• Document output schema in docstring: 'Returns: str, concatenated plaintext from matching documentation pages, or "No results found" if search yields no results.'
• Add input validation: sanitize 'query' to prevent injection; add result size limit (e.g., max 10KB per result, max 2 results); add explicit error messages for timeout, API errors, and empty results with recovery guidance.