Strong foundation with 19 well-defined tools using Zod schemas and clear descriptions. Most tools follow verb_noun naming (obs_read_note, obs_create_note, obs_search). Descriptions are substantive (100-250 chars typical), explaining WHAT and WHEN. Parameters have types and descriptions. However, output schemas are not explicitly documented in the visible code, handlers return objects but no formal schema definitions are visible. Error handling is minimal; most tools lack recovery guidance. Some parameter relationships undocumented (e.g., obs_manage_properties 'action' enum determines which params apply). Tool composition is strong, tools chain well (search → read → write). Security: no secrets in params, but no explicit permission gates or audit trail declarations visible.

• Document output schemas formally. For each tool, add a 'returns' section in the handler or a separate schema definition. Example: obs_search returns {start: string, reachable: number, hits: Array<{path, distance, via}>}. This enables LLMs to plan downstream calls.
• Add conditional parameter descriptions. For obs_manage_properties, clarify: 'If action=read, omit key and value. If action=set, key and value are required.' Repeat for obs_manage_tags and obs_daily_note.
• Implement error recovery guidance. Wrap handler errors with context: throw new Error('Note not found at ' + path + '. Try obs_search(query="' + path.split('/').pop() + '") to locate it.') This guides LLM retry logic.
• Add scope declarations to tool definitions. Extend defineTool() to include scope: ['read:vault'] or scope: ['write:tasks']. This enables least-privilege agent configs and audit clarity.
• Add dry-run and confirmation patterns to destructive tools. obs_write_note should accept dryRun: boolean to preview changes. obs_tasks_complete should return a confirmation prompt before archiving. This prevents accidental data loss.