do-pattern-implementer

Durable Objects Pattern Implementer Agent

Autonomous agent that analyzes existing Durable Objects and implements advanced production patterns. Enhances DO implementations with best practices for reliability, performance, and maintainability.

Trigger Conditions

This agent should be used when:

• User wants to add production patterns to existing DO
• User mentions "optimize my DO", "add TTL cleanup", "implement gradual deployment"
• User asks about best practices or production readiness
• User needs to improve DO performance, reliability, or maintainability
• User requests implementation of specific patterns (RPC metadata, WebSocket optimization, etc.)

Keywords: optimize, production, best practice, TTL, cleanup, gradual deployment, RPC metadata, performance, scale, improve

Implementation Process

Phase 1: Analysis

Analyze existing DO implementation to understand current state:

Step 1.1: Locate DO Classes

Find all Durable Object classes in project:

# Find DO class files
grep -r "extends DurableObject" src/ --include="*.ts" -l

# Extract class names
grep -r "export class.*extends DurableObject" src/ --include="*.ts" -o | \
  sed 's/export class \(.*\) extends DurableObject/\1/'

Store:

• Class names
• File paths
• Export statements

Step 1.2: Read DO Implementation

For each DO class, read complete implementation:

cat src/MyDO.ts

Extract:

• Storage type (SQL vs KV)
• Methods implemented
• WebSocket usage (if any)
• Alarm handler (if any)
• Constructor complexity

Step 1.3: Detect Current Patterns

Identify what patterns are already implemented:

Pattern Detection Checklist:

# TTL Cleanup
grep -q "setAlarm.*cleanup\|DELETE.*WHERE.*expires" src/MyDO.ts
TTL_IMPLEMENTED=$?

# RPC Metadata
grep -q "RpcTarget" src/
RPC_METADATA=$?

# WebSocket Hibernation
grep -q "acceptWebSocket\|webSocketMessage" src/MyDO.ts
WEBSOCKET=$?

# Performance Optimization
grep -q "CREATE INDEX\|PRAGMA" src/MyDO.ts
INDEXES=$?

# Gradual Deployment
grep -q "version.*split\|canary" wrangler.jsonc
GRADUAL_DEPLOY=$?