UMG0 demonstrates solid tool design with well-structured schemas, clear naming conventions, and comprehensive parameter documentation. All 6 tools follow verb_noun patterns (retain, recall, get_memory, reflect, list_memories, prune). Descriptions are substantive (100-200 chars typical), explaining WHAT, WHEN, and consequences. Input schemas use Zod with proper type constraints, enums for tiers, and numeric bounds. However, output schemas are not explicitly documented in the visible code, responses are shaped via textResult() and compactMemory() functions, but the LLM-facing contract is not formally declared. Error handling is minimal; no recovery guidance or actionable error messages visible. Security is reasonable (no secrets in params, namespace isolation), but no explicit permission gates or audit trail declarations.

• Document output schemas explicitly for each tool. Define the shape of compactMemory and fullMemory responses in tool registration or a separate schema document. Include field types, presence conditions (e.g., content_truncated only when cut), and ranges (e.g., decay 0-1).
• Add error classification and recovery guidance. Return structured errors with category (retryable|user_fixable|fatal), the invalid value, and the constraint violated. E.g., 'Invalid tier: got "working2", must be one of: working, episodic, semantic, procedural.'
• Implement tool annotations. Register retain, reflect, and prune with destructiveHint=true; mark recall, get_memory, list_memories with readOnlyHint=true. This signals to LLMs which tools are safe to retry.
• Enhance parameter descriptions with format constraints. Document namespace pattern (e.g., 'alphanumeric + colon, max 64 chars'), importance range (0-1 float), and tag format (e.g., 'lowercase, no spaces, max 32 chars each').
• Add a confirmation pattern for prune. Require explicit confirm=true after a dry_run, or return a 'confirmation_required' response that forces the LLM to acknowledge before executing destructive consolidation.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry