oclaw/openclaw/extensions/open-prose/skills/prose/examples/22-error-handling.prose

# Error Handling Example
# Demonstrates try/catch/finally patterns for resilient workflows

# Basic try/catch for error recovery
try:
  session "Attempt to fetch data from external API"
catch:
  session "API failed - use cached data instead"

# Catch with error variable for context-aware handling
try:
  session "Parse and validate complex configuration file"
catch as err:
  session "Handle the configuration error"
    context: err

# Try/catch/finally for resource cleanup
try:
  session "Open database connection and perform queries"
catch:
  session "Log database error and notify admin"
finally:
  session "Ensure database connection is properly closed"

# Nested error handling
try:
  session "Start outer transaction"
  try:
    session "Perform risky inner operation"
  catch:
    session "Recover inner operation"
    throw  # Re-raise to outer handler
catch:
  session "Handle re-raised error at outer level"

# Error handling in parallel blocks
parallel:
  try:
    session "Service A - might fail"
  catch:
    session "Fallback for Service A"
  try:
    session "Service B - might fail"
  catch:
    session "Fallback for Service B"

session "Continue with whatever results we got"

# Throwing custom errors
session "Validate input data"
throw "Validation failed: missing required fields"