This MCP server demonstrates solid definition quality with comprehensive schemas, descriptive parameter documentation, and thoughtful error handling guidance. All 10 tools have explicit registrations with input and output schemas visible in src/toolDefinitions.js. Tool names follow verb_noun conventions (search-vault, read-note, write-note, delete-note, append-note, list-notes, search-by-title, search-by-tags, get-note-metadata, discover-mocs). Descriptions range from 30-400 chars with the longest (search-vault) providing extensive guidance on search operators and syntax. Parameter documentation is comprehensive, most include type, description, min/max constraints, and defaults. Output schemas are fully documented with nested object structures. However, there are moderate gaps: (1) some tool descriptions lack WHEN-to-use context, (2) parameter descriptions occasionally use informal language rather than formal constraints, (3) error handling is described but not shown in the output schema, (4) no tool annotations (readOnlyHint/destructiveHint/idempotentHint) despite having clear intent patterns. The delete-note tool shows sophisticated conditional description logic (plain vs confirming based on client capability), which is a best practice for elicitation-aware tools.

• Add tool annotations to tool definitions: set 'readOnlyHint' for all search/read/list/get tools, 'destructiveHint' for delete-note, and 'idempotentHint' for read-only operations. Format: tools[].annotations = { readOnlyHint?: boolean, destructiveHint?: boolean, idempotentHint?: boolean }.
• Expand short descriptions (search-by-title, list-notes, search-by-tags, discover-mocs) to 80-150 chars including WHEN-to-use context. Example: 'Search for notes by their exact H1 heading. Use this when you know a note's title; use search-vault for content-based queries. Returns matching notes with paths and previews.'
• Define error output schema for each tool showing: { success: boolean, error?: { code: string, message: string, recovery?: string }, data?: {...} }. Add to toolDefinitions outputSchema. This lets clients and LLMs handle failures consistently.
• Include constraint descriptions in parameter documentation. For example, change 'Number of lines before and after match to include (default: 2)' to 'Number of lines before and after match to include (0-10, default 2), constrains context window impact.'
• Add dependency hints to tool descriptions. Example: search-by-title could note 'If you have partial text, use search-vault instead.' This reduces wasted calls and guides multi-step planning.
• Document the relationship between search-vault (content) vs search-by-title (H1 only) vs search-by-tags (tag-based) in descriptions. LLMs need to understand when to choose each variant.
• For delete-note, ensure the conditional description (plain vs confirming) is computed at request time based on client capabilities (elicitation support). Current code shows the pattern is present, verify it's wired correctly in handler.