Two tools with clear, actionable descriptions and comprehensive input schemas. send_postcard has excellent parameter documentation (16 fields with types, descriptions, and constraints). generate_message is simpler but well-described. Both tools declare their risk profile (IRREVERSIBLE vs READ_ONLY). Naming follows verb_noun convention. Main gaps: output schemas are not documented in the source; error handling guidance is minimal; no pagination or batch variants despite potential for multi-card workflows.

• Document output schemas for both tools. send_postcard should return {postcard_id, tracking_url, estimated_delivery, cost_usd, status}. generate_message should return {message, tone_applied, recipient_context_used} or similar structured object.
• Enhance error messages with recovery guidance. E.g., 'Image URL unreachable (HTTP 404). Ensure the URL is public and HTTPS. Try a different image or use the default card.' instead of generic 'Cannot fetch image from URL'.
• Add a get_account_status tool to expose daily spend, remaining budget, and available handwriting styles. Agents can then query limits before attempting sends.
• Document idempotency semantics in send_postcard parameter description: 'Unique key to prevent duplicate sends on retries. If a prior send with this key succeeded, returns the original result without sending a new card. Cache TTL: 24 hours.'
• Consider a batch_send_postcards tool accepting an array of recipients. Agents often need to mail multiple cards; sequential calls waste tokens and latency. Batch variant improves composition.

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

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