Lore is a Rust-based semantic search MCP server with 5 tools, all directly registered in src/server.rs with explicit schemas and descriptions. Naming follows verb_noun conventions (lore_search, lore_list, lore_status, lore_write_pattern, lore_read_pattern), which is good. Descriptions are present for all tools (ranging 50-150 chars, within the 10-1024 baseline). However, several critical gaps emerge: (1) Parameter descriptions are minimal or absent, e.g., lore_search's 'top_k' lacks a description of its default value or valid range; lore_write_pattern's 'file_path' and 'content' params have thin descriptions with no constraints on path structure or file format. (2) Output schemas are NOT documented, the code shows input schemas but does not describe what these tools return, forcing LLMs to infer structure. (3) Error handling is implicit, no guidance on recovery, retryability, or actionable error messages in responses. (4) No tool annotations (readOnlyHint, destructiveHint) despite clear risk profiles (lore_write_pattern is WRITE; others are READ_ONLY). (5) lore_list returns no pagination parameters, risking context exhaustion on large knowledge bases. The server is functional for basic use but lacks the polish expected in production tools.

• Document the output schema for each tool. For lore_search, specify: [{id: string, title: string, relevance_score: float, snippet: string}]. For lore_list, specify: [{id: string, name: string, tags: string[]}]. For lore_read_pattern, specify: {content: string, created_at: ISO8601, updated_at: ISO8601}.
• Add detailed parameter descriptions: (1) lore_search: 'top_k' should read 'Number of results to return (default: 10, range: 1-100)'. (2) lore_write_pattern: 'file_path' should read 'Relative path within knowledge base (must be .md file, no directory traversal, UTF-8 encoding)' and 'content' should read 'Markdown content with optional YAML frontmatter (required keys: title, date; optional: tags, category)'. (3) lore_read_pattern: 'file_path' should specify 'Relative path of the pattern file (must exist and be readable; returns raw markdown).'
• Add tool annotations to leverage the MCP spec: Mark lore_write_pattern with destructiveHint (true) to signal it modifies state. Mark lore_search, lore_list, lore_status, lore_read_pattern with readOnlyHint (true) to signal they are safe.
• Add pagination to lore_list: Introduce 'limit' (1-100, default 20) and 'offset' (default 0) parameters. Return {patterns: [...], total_count: integer, has_more: boolean}.
• Document error scenarios and recovery paths: For lore_write_pattern, specify: 'Returns error if file_path contains directory traversal, file_path doesn't end in .md, or frontmatter is invalid. Example recovery: validate path format before retrying.' For lore_read_pattern, specify: 'Returns error if file_path not found (404) or not readable (403). Suggestion: call lore_list or lore_search first to verify the pattern exists.'