Four read-only audit tools with solid naming (verb_noun pattern: list_, query_, verify_, get_) and clear descriptions (100-150 chars each). All tools have input schemas with types and descriptions. However, output schemas are not documented in the visible code, only input schemas are explicit. Parameter descriptions are adequate but lack format constraints (e.g., UUID format for session_id, limit bounds). No error handling guidance visible. Tools are well-composed (single responsibility) and follow the audit log domain cleanly.

• Document output schemas for all four tools. For verify_session_chain, explicitly define the {valid: bool, record_count: int, first_invalid_sequence: int | null, error: string | null} structure as a JSON Schema or TypedDict in docstrings.
• Add parameter constraints: limit should be 1-100 (or appropriate range); session_id and action_id should be documented as UUID format (36-char hex with hyphens). Include validation error examples in descriptions.
• Add error handling guidance: 'If session_id is not found, returns error: "Session not found". Verify the session_id is a valid UUID.' This helps LLMs self-correct.
• For list_sessions, document pagination: 'Returns up to `limit` sessions (default 20). To fetch more, call again with a later start_time filter or implement cursor-based pagination if available.'
• Consider adding tool annotations (readOnlyHint=true) to all four tools to signal to MCP clients that these are safe, non-destructive operations.