🔍 Failure-Driven Debugging System

Overview

Implement intelligent debugging system that automatically reproduces failures, generates minimal repros, and proposes verified fixes.

Problem

Current debugging relies heavily on human analysis. No automated failure reproduction, root cause analysis, or systematic fix generation and verification.

Solution

Build comprehensive debugging automation:

Core Capabilities

• Automatic Reproduction: Container-based failure recreation
• Minimal Repro Generation: Reduce failing cases to essentials
• Hypothesis Generation: AI-powered root cause analysis
• Git Bisection: Automated regression detection
• Dynamic Instrumentation: Runtime analysis and tracing
• Fix Generation: Targeted patches with verification

Debugging Pipeline

1. Failure Ingestion: Parse logs, stack traces, test failures
2. Environment Reproduction: Recreate exact failure conditions
3. Minimization: Reduce to smallest reproducing case
4. Analysis: Generate hypotheses ranked by likelihood
5. Instrumentation: Add logging/tracing as needed
6. Fix Generation: Create targeted patches
7. Verification: Ensure fix works and doesn't regress

Debug Tools

trait DebugTool {
    async fn reproduce(&self, failure: &Failure) -> Result<ReproEnvironment>;
    async fn minimize(&self, repro: &ReproEnvironment) -> Result<MinimalRepro>;
    async fn analyze(&self, repro: &MinimalRepro) -> Result<Vec<Hypothesis>>;
    async fn instrument(&self, code: &Code, hypothesis: &Hypothesis) -> Result<InstrumentedCode>;
    async fn generate_fix(&self, analysis: &Analysis) -> Result<Vec<Fix>>;
    async fn verify_fix(&self, fix: &Fix, repro: &MinimalRepro) -> Result<VerificationResult>;
}

Failure Types Supported

• Compilation Errors: Type mismatches, missing imports
• Runtime Exceptions: Null pointers, bounds errors
• Test Failures: Assertion failures, timeout issues
• Performance Regressions: Latency, memory, throughput
• Integration Failures: Service communication, API changes

CLI Interface

# Debug from logs
grimoire debug --from-logs error.log --generate-fix

# Debug failing test
grimoire debug --test failing_test_name --minimal-repro

# Bisect regression
grimoire debug --bisect --from-commit abc123 --to-commit def456

# Interactive debugging
grimoire debug --interactive --attach-container

Implementation Plan

1. Build failure parsing and classification system
2. Add container-based reproduction environment
3. Implement minimization algorithms
4. Build hypothesis generation using code analysis
5. Add dynamic instrumentation capabilities
6. Create fix generation and verification pipeline

Success Criteria

• Reproduce 85%+ of reported failures automatically
• Generate minimal repros in <5min average
• Fix success rate >60% for common failure types
• Zero false positive fixes (no regressions)

Timeline

10-12 weeks for core system, 16-20 weeks with full coverage

Dependencies

• Project Graph for code analysis
• ToolGraph for workflow execution
• Container/sandbox infrastructure