tracing-root-causes

name	tracing-root-causes
description	AI agent performs systematic root cause analysis using 5 Whys, Fishbone diagrams, and evidence-based investigation. Use when debugging, conducting post-mortems, or investigating incidents. Use when this capability is needed.
metadata	{"author":"doanchienthangdev"}

Tracing Root Causes

Quick Start

1. Identify Symptom - Document the observable problem
2. Gather Evidence - Collect logs, metrics, traces around incident
3. Apply 5 Whys - Ask "Why?" iteratively until fundamental cause found
4. Map Categories - Use Fishbone to explore all cause categories
5. Document Findings - Create RCA report with action items

Features

Feature	Description	Guide
Cause Hierarchy	Symptom -> Proximate -> Root -> Systemic	Fix at deepest level possible
5 Whys	Iterative "Why?" questioning	Typically 5 iterations to root cause
Fishbone Diagram	Category-based cause exploration	Code, Data, Config, Infra, External, Process
Evidence Gathering	Logs, metrics, traces, reproduction	Timestamp, source, reliability rating
RCA Report	Structured documentation	Timeline, cause chain, action items
Systemic Factors	Why wasn't this caught earlier?	Testing, monitoring, process gaps

Common Patterns

# 5 Whys Example
Problem: Website down for 2 hours

Why #1: Why down? -> Server out of memory
Why #2: Why out of memory? -> Connections unbounded
Why #3: Why unbounded? -> Not released after use
Why #4: Why not released? -> Early return skipped finally
Why #5: Why not caught? -> No test for cleanup path

Root Causes:
1. Technical: Missing cleanup execution
2. Systemic: Missing test coverage
3. Process: Code review missed pattern

# Fishbone Categories (Software)
CODE:       Logic errors, race conditions, memory leaks
DATA:       Invalid input, corrupt data, schema mismatch
CONFIG:     Wrong settings, env mismatch, feature flags
INFRA:      Resource exhaustion, network, scaling
EXTERNAL:   Third-party APIs, dependencies, attacks
PROCESS:    Missing tests, review gaps, monitoring blind spots

# Cause Hierarchy
SYMPTOM: "App crashed"
    |
PROXIMATE CAUSE: "Out of memory"
    |
CONTRIBUTING FACTOR: "No memory limits"
    |
ROOT CAUSE: "Memory leak in event handlers"
    |
SYSTEMIC FACTOR: "No memory monitoring"

PRINCIPLE: Fix symptoms = problem returns
           Fix root cause = this problem prevented
           Fix systemic = class of problems prevented

Best Practices

Do	Avoid
Gather evidence before forming hypotheses	Jumping to conclusions
Use structured methods consistently	Ad-hoc investigation
Involve multiple perspectives	Single viewpoint
Look for systemic factors	Just fixing immediate cause
Create actionable recommendations	Vague "be more careful"
Verify fixes prevent recurrence	Assuming fix works
Share learnings across team	Siloing knowledge
Investigate near-misses too	Only investigating failures

Related Skills

• debugging-systematically - Four-phase debugging process
• solving-problems - 5-phase problem-solving framework
• thinking-sequentially - Numbered thought chains
• verifying-before-completion - Ensure fix completeness

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