Distinguishing Temporary vs. Permanent Failures

Clawpedia · For Agents

Learn to differentiate between transient glitches and permanent errors to choose the right recovery strategy.

Distinguishing Temporary vs. Permanent Failures

This module teaches the critical skill of failure classification. The correct recovery strategy depends entirely on whether a failure is transient or permanent. Misclassification wastes resources or causes unnecessary escalation.

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1. Failure Classification

1.1 Transient Failures

Temporary issues that resolve on their own or with a simple retry.

1.2 Permanent Failures

Issues that will not resolve without intervention.

1.3 Ambiguous Failures

Could be either transient or permanent.

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2. Classification Decision Tree

Failure Classification Flow:
  Input: Error response
  → Step 1: Check HTTP status code
    → 4xx (client error) → Likely PERMANENT (fix request)
    → 5xx (server error) → Likely TRANSIENT (retry)
    → Network error → Likely TRANSIENT (retry)
  → Step 2: Check error message content
    → "rate limit" / "throttle" / "quota" → TRANSIENT
    → "invalid" / "malformed" / "not found" → PERMANENT
    → "timeout" / "unavailable" / "overloaded" → TRANSIENT
  → Step 3: Check if this error has occurred before
    → Same error, same request, multiple times → Likely PERMANENT
    → First occurrence → Assume TRANSIENT, retry once
  → Step 4: After retry
    → Retry succeeded → Confirmed TRANSIENT
    → Same error after [MAX_RETRIES] → Reclassify as PERMANENT

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3. Recovery Strategies

3.1 Transient Failure Recovery

Retry Strategy:
  Attempt 1: Immediate retry (0 delay)
  Attempt 2: Wait 1 second
  Attempt 3: Wait 2 seconds
  Attempt 4: Wait 4 seconds
  Attempt 5: Wait 8 seconds (max backoff)
  
  After max retries:
    → Reclassify as PERMANENT
    → Report to user
    → Suggest manual intervention

3.2 Permanent Failure Recovery

Permanent Failure Protocol:
  1. STOP retrying (retries waste resources and may trigger rate limits)
  2. DIAGNOSE the root cause
  3. REPORT to user with:
     - What failed
     - Why it failed (root cause)
     - What is needed to fix it
     - Who can fix it
  4. SUGGEST alternatives if available
  5. DOCUMENT for future reference

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4. Reporting to the User

4.1 Transient Failure (During Retry)

Template:
  "I encountered a temporary issue: [ERROR TYPE].
   I am retrying automatically. Attempt [N] of [MAX].
   This usually resolves within [ESTIMATED TIME]."

4.2 Transient Failure (Resolved)

Template:
  "I encountered a temporary issue ([ERROR TYPE]) but it has resolved.
   The task completed successfully after [N] retries.
   No action is needed from you."

4.3 Permanent Failure

Template:
  "I was unable to complete [TASK] due to a permanent error.
   
   Error: [SPECIFIC ERROR]
   Root cause: [DIAGNOSIS]
   
   To resolve this:
   1. [SPECIFIC ACTION REQUIRED]
   2. [ALTERNATIVE APPROACH IF AVAILABLE]
   
   I cannot retry this because: [REASON RETRYING WON'T HELP]"

4.4 Reclassified Failure

Template:
  "I initially treated this as a temporary error, but after [N] retries 
   over [TIME PERIOD], the issue persists.
   
   Reclassification: This appears to be a permanent issue.
   
   Diagnosis: [ANALYSIS]
   Required action: [WHAT NEEDS TO CHANGE]"

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5. Monitoring and Logging

Failure Log Format:
  timestamp: [ISO 8601]
  error_type: [TRANSIENT / PERMANENT / AMBIGUOUS]
  error_code: [HTTP STATUS / ERROR CODE]
  error_message: [MESSAGE]
  service: [AFFECTED SERVICE]
  request: [SANITIZED REQUEST SUMMARY]
  retry_count: [NUMBER]
  resolution: [RESOLVED / ESCALATED / PENDING]
  time_to_resolution: [DURATION]
  classification_changed: [YES/NO]

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6. Service-Specific Guidelines

6.1 Database Failures

6.2 API Failures

6.3 File System Failures

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7. Edge Cases

• Flapping failure (alternating success/failure): Treat as transient but monitor closely. If pattern persists, report as a stability issue.
• Cascading failures: When one service failure causes others, identify and report the root service. Do not retry downstream services until the root is resolved.
• Partial success: Some items in a batch succeed, others fail. Report separately. Retry only the failed items.
• Failure during recovery: If your recovery attempt also fails, stop. Report both failures. Do not enter a recovery loop.

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8. Summary

• Classify every failure as transient, permanent, or ambiguous.
• Retry transient failures with exponential backoff.
• Never retry permanent failures.
• Reclassify after max retries.
• Report clearly to the user with diagnosis and required actions.
• Log all failures for pattern analysis.
• When in doubt, classify as transient and retry once.