Issue Resolution Pipeline

Systematically resolve issues through iterative diagnosis and verified fixes.

Pipeline Overview

code

INPUT → Triage → Reproduction → Root Cause Analysis → Impact → Fix → Verify
              ◄──────────────►◄────────────────────►
                    (Iterative loops allowed)

Phase	Purpose	Output
0. Triage	Normalize input, classify severity	Issue Brief
1. Reproduction	Prove the bug, trace code path	Repro Report + Test
2. Root Cause Analysis	Find WHY, not just WHERE	RCA Report
3. Impact Assessment	Blast radius, regression risk	Impact Report
4. Fix Decomposition	Break into beads	.beads/*.md
5. Verification	Prove fix works, no regressions	Passing tests

Phase 0: Triage

Normalize different input types to a structured Issue Brief.

Input Types

Type	Triage Strategy
Vague report	Clarify → Explore → Reproduce
Error/Stack trace	Parse trace → Locate code → Reproduce
Failing test	Run test → Extract assertion → Trace

Vague Report Triage

code

User: "Login is broken"
         │
         ▼
Ask clarification questions:
• What error do you see?
• When did it start working / stop working?
• What steps trigger it?
• Specific user/browser/environment?
         │
         ▼ (if user can't clarify)
Explore:
• mcp__gkg__search_codebase_definitions: Find auth/login related code
• git log: Recent changes in area
• Check logs if available

Error/Stack Trace Triage

code

Parse the stack trace:
• Extract file:line locations
• mcp__gkg__get_definition on functions in trace
• Read surrounding context
         │
         ▼
Identify reproduction conditions:
• What input caused this?
• Can we write a test?

Failing Test Triage

code

Run test in isolation:
• bun test <file> --filter "<test name>"
• Read test file for setup/assertions
• Check git log: was it passing before?
         │
         ▼
Trace implementation:
• What code does test exercise?
• mcp__gkg__get_references on tested function
• Recent changes to implementation?

Severity Classification

Determines reproduction requirements:

Severity	Reproduction Required
CRITICAL (production, security)	Failing test REQUIRED
REGRESSION (was working)	Failing test REQUIRED
RACE CONDITION (timing)	Failing test REQUIRED
LOGIC BUG	Failing test PREFERRED
UI/VISUAL	Manual + screenshot OK
PERFORMANCE	Benchmark/profile OK
QUICK FIX (obvious cause)	Manual repro OK

Issue Brief Template

Save to history/issues/<id>/brief.md:

markdown

# Issue Brief: <Short Title>

**Severity**: CRITICAL / HIGH / MEDIUM / LOW
**Type**: Regression / Edge case / Race condition / UI / Performance / Other
**Repro Required**: Failing test / Manual OK

## Symptom

<What is happening>

## Expected Behavior

<What should happen>

## Reproduction

<Steps, test command, or code path>

## Evidence

<Error message, stack trace, test output>

## Affected Area

<Files, modules, features involved>

## Timeline

<When started, recent changes if known>

Phase 1: Reproduction

Prove the bug exists and trace the code path.

If Failing Test Required

bash

# Create test file
# packages/<area>/src/__tests__/<feature>.regression.test.ts

# Test should:
# 1. Set up conditions that trigger bug
# 2. Assert expected behavior (currently fails)
# 3. Be deterministic

Reproduction Checklist

• Bug is reproducible on demand
• Exact error/behavior captured
• Minimal reproduction (simplest case that fails)
• Code path identified (stack trace or tracing)

Code Path Tracing

code

mcp__gkg__get_definition     → Find where error originates
mcp__gkg__get_references     → Find callers
git blame <file>       → Who changed it, when
git log -p <file>      → What changed recently

Repro Report Template

Save to history/issues/<id>/repro.md:

markdown

# Reproduction Report: <Issue Title>

## Reproduction Method

☐ Failing test: `<test file and name>`
☐ Manual: <steps>

## Error/Behavior Captured

<Exact error message, stack trace>

## Code Path

1. Entry: `<file>:<line>` - <function>
2. Calls: `<file>:<line>` - <function>
3. Fails at: `<file>:<line>` - <reason>

## Recent Changes (if relevant)

- <commit>: <summary>

Phase 2: Root Cause Analysis

Find WHY the bug happens, not just WHERE.

RCA Framework

code

STEP 1: Generate hypotheses (3-5)
         │
         ▼
STEP 2: Gather evidence for/against each
         │
         ▼
STEP 3: Eliminate hypotheses
         │
         ▼
STEP 4: Confirm root cause

Bug Type → RCA Strategy

Bug Type	Strategy	Key Tools
Regression	Find breaking change	`git bisect`, `git blame`
Edge case	Analyze boundary inputs	Type inspection, boundary tests
Race condition	Trace async flow	Timing logs, async analysis
Data corruption	Trace state changes	Data flow analysis
External dep	Check version/API changes	Changelogs, API docs

Oracle for RCA

Hypothesis Generation:

code

oracle(
  task: "Generate root cause hypotheses",
  context: """
    Symptom: <error>
    Code path: <trace>
    Recent changes: <git log>

    Generate 3-5 hypotheses ranked by likelihood.
    For each, what evidence would support/refute it?
  """,
  files: ["<affected files>"]
)

Hypothesis Validation:

code

oracle(
  task: "Validate root cause hypothesis",
  context: """
    Hypothesis: <proposed cause>
    Evidence: <gathered evidence>

    1. Does evidence support or refute?
    2. Explain causal chain: cause → symptom
    3. What would confirm this?
  """,
  files: ["<relevant files>"]
)

Iteration: RCA → Reproduction Loop

If hypothesis needs more evidence:

code

IN RCA: "Need timing logs to confirm race condition"
    │
    ▼
BACK TO REPRO:
• Add instrumentation
• Run with specific conditions
• Capture new evidence
    │
    ▼
RETURN TO RCA with new evidence

RCA Report Template

Save to history/issues/<id>/rca.md:

markdown

# Root Cause Analysis: <Issue Title>

## Iteration: <N>

## Hypotheses Considered

### Hypothesis A: <Description>

- **Likelihood**: HIGH / MEDIUM / LOW
- **Supporting evidence**: ...
- **Refuting evidence**: ...
- **Verdict**: ✓ CONFIRMED / ✗ ELIMINATED

### Hypothesis B: ...

## Root Cause (Confirmed)

**Cause**: <Clear statement>

**Causal chain**:

1. <Step> leads to
2. <Step> leads to
3. <Symptom>

## Why This Happened

<Underlying reason - missing validation, wrong assumption, etc.>

## Fix Approach

**Immediate**: <What to change>
**Preventive**: <How to prevent similar bugs>

Phase 3: Impact Assessment

Before fixing, understand blast radius.

Impact Analysis

code

mcp__gkg__get_references <affected function>
    → Who else calls this?

Grep for related patterns
    → Similar code that might have same bug?

Review test coverage
    → What tests cover this area?

Regression Risk

Factor	Risk Level
High usage function	HIGH
Shared utility	HIGH
Public API change	HIGH
Internal helper	LOW
Isolated module	LOW

Spike for Complex Fixes

If fix approach is uncertain:

bash

bd create "Spike: Validate fix approach for <issue>" -t task -p 0

Execute via MULTI_AGENT_WORKFLOW, write to .spikes/<issue-id>/.

Impact Report Template

Save to history/issues/<id>/impact.md:

markdown

# Impact Assessment: <Issue Title>

## Blast Radius

### Direct Impact

- <File/function directly changed>

### Callers Affected

- <List from mcp__gkg__get_references>

### Related Code

- <Similar patterns that may need same fix>

## Regression Risk

**Level**: HIGH / MEDIUM / LOW
**Reason**: <Why this risk level>

## Test Coverage

- Existing tests: <list>
- Tests to add: <list>

## Fix Validation

☐ Spike completed (if needed): `.spikes/<id>/`
☐ Fix approach validated

Phase 4: Fix Decomposition

Break fix into beads.

Simple Fix (Single Bead)

bash

bd create "Fix: <issue title>" -t bug -p <priority>

Bead includes:

•Root cause reference
•Fix implementation
•Test (failing → passing)
•Docs update (if behavior change)

Complex Fix (Multiple Beads)

bash

bd create "Epic: Fix <issue>" -t epic -p <priority>
bd create "Add regression test for <issue>" -t task --blocks <epic>
bd create "Fix <component A>" -t bug --blocks <epic> --deps <test>
bd create "Fix <component B>" -t bug --blocks <epic> --deps <test>
bd create "Update docs for <behavior change>" -t task --blocks <epic> --deps <fix-a>,<fix-b>

Fix Bead Template

markdown

# Fix: <Issue Title>

**Type**: bug
**Priority**: <0-4>
**Fixes**: <issue reference>

## Root Cause

<From RCA report>

## Fix Implementation

<What to change and why>

## Files to Modify

- `<file>`: <change description>

## Acceptance Criteria

- [ ] Regression test passes
- [ ] Original symptom no longer reproducible
- [ ] No new test failures
- [ ] `bun run check-types` passes
- [ ] `bun run build` passes

Phase 5: Verification

Prove fix works and nothing else broke.

Verification Checklist

bash

# 1. Regression test passes
bun test <regression-test-file>

# 2. Original symptom gone
<manual verification or test>

# 3. No new failures
bun run test

# 4. Types and build
bun run check-types
bun run build

Iteration: Verify → RCA Loop

If fix doesn't work:

code

Test still fails after fix
    │
    ▼
Root cause was wrong or incomplete
    │
    ▼
BACK TO RCA:
• Eliminate current hypothesis
• Generate new hypotheses
• Update RCA Report with iteration

Verify → Impact Loop

If fix causes regressions:

code

New test failures after fix
    │
    ▼
Fix has unintended side effects
    │
    ▼
BACK TO IMPACT:
• Reassess blast radius
• Consider alternative fix approach

Loop Limits

Prevent infinite iteration:

Loop	Soft Limit	Hard Limit	At Hard Limit
RCA → Repro	2	4	Escalate / pair debug
RCA → Triage	1	2	Re-evaluate original report
Verify → RCA	2	3	Oracle deep review

Quick Reference

Tool Selection

Need	Tool
Parse stack trace	Read + mcpgkgget_definition
Find callers	mcpgkgget_references
Recent changes	git log, git blame
Binary search commits	git bisect
Reasoning about cause	oracle
Validate fix approach	Spike via MULTI_AGENT_WORKFLOW

Common Mistakes

•Fixing symptom, not cause → Leads to recurrence
•Skipping reproduction → Can't verify fix
•No regression test → Bug returns later
•Ignoring impact → Fix breaks other things
•Not iterating → Wrong diagnosis persists