Cratedex demonstrates above-average definition quality with strong naming conventions, comprehensive parameter documentation, and clear tool responsibilities. All four tools follow verb_noun patterns (search_docs, index_project, get_diagnostics, list_projects). Parameter schemas are well-defined with types, descriptions, and appropriate enums. However, output schemas are not explicitly documented in the source code, and error handling guidance is minimal. Tool descriptions are solid (140-250 chars) but lack actionable recovery hints for agents.

• Document all output schemas explicitly. For search_docs, specify: returns array of {crate_name, item_name, item_kind, item_path, doc_summary, parent_module, relevance_score}. For index_project, specify: returns {status, project_path, phase, progress_percent, indexed_crate_count, ...}.
• Add recovery guidance to error-prone tools. Example: 'search_docs: If mode=symbol returns 0 results, try mode=auto (intelligent selection) or mode=text (phrase matching). If still empty, use filter_crates to narrow scope.'
• Clarify query mode semantics in search_docs description. Add: 'mode=auto: detects whether query is a phrase or symbol; mode=text: phrase search (e.g., "async fn"); mode=symbol: identifier search (e.g., tokio::spawn); mode=fts5: raw FTS5 operators (AND, OR, NOT). Use symbol for API lookups, text for documentation phrase searches.'
• Explicitly state mutation semantics for index_project. Change description to: 'Index a Rust project... This call may take minutes. Re-indexing the same project is idempotent (will update existing entries, not duplicate).'
• Document list_projects pagination. Add to description: 'Returns paginated list with total count. If results.len() < limit, you have reached the end. Use offset=N*limit to fetch next page.'
• Add parameter constraints to search_docs max_depth. Clarify in description: 'max_depth=0 searches only the workspace, max_depth=1 includes direct dependencies, null searches all transitive dependencies (may be slower).'
• Return include-chaining-ids. Ensure search_docs results include crate_name and item_path so agents can immediately call get_diagnostics or index_project with the returned project_path.