This server provides 5 READ-ONLY tools for PubMed literature search and summarization. Naming is action-verb-based and generally clear (search_pubmed, get_abstract, get_citations, find_reviews, summarize_findings). All tools have brief descriptions present in docstrings. However, schemas lack critical structure: input parameters are inferred from function signatures rather than explicitly registered with JSON Schema, output formats are not formally documented, and error handling is absent. The summarize_findings tool is particularly weak, it truncates abstracts arbitrarily ('abstract[:1000]...') without explaining the PICO methodology in the description. No parameter validation, no enum constraints for citation styles (AMA, APA, Vancouver), and no guidance on what happens when a PMID is invalid or external services fail. Composition is reasonable (tools are single-responsibility), but the lack of structured schemas and error guidance limits agent reliability.

• Define explicit JSON Schema output formats for each tool. Example for search_pubmed: return {"results": [{"pmid": "string", "title": "string", "url": "string"}], "total": integer, "next_cursor": string|null}
• Add enum constraint for get_citations style parameter: {"type": "string", "enum": ["AMA", "APA", "Vancouver"], "description": "Citation format..."}
• Implement error handling that returns structured error objects with actionable guidance. Example: {"error": "pmid_not_found", "message": "PMID 99999999 not found in PubMed. Verify the ID and retry.", "suggestion": "Try search_pubmed() to find valid PMIDs."}
• Add parameter constraints in descriptions: 'max_results: integer, 1-1000, default 10' for search_pubmed and find_reviews. Validate inputs and reject values outside this range with clear error messages.
• Rewrite summarize_findings description and implementation to accurately reflect what it does. Either: (a) implement true PICO extraction using an LLM or NLP library, or (b) rename to 'get_abstract_preview' and clarify it returns the first 1000 characters.
• Add pagination support: search_pubmed and find_reviews should return paginated results with a cursor/offset and total count. Limit default result size to 20 to reduce token bloat.
• Document timeout behavior and retry guidance for external HTTP calls. Add try-catch blocks that return recoverable errors: {"error": "pubmed_timeout", "message": "PubMed API did not respond within 10s. Please retry."}
• Include dependency hints in descriptions. Example for summarize_findings: 'Call get_abstract() or search_pubmed() first to obtain a valid PMID.'