Root Cause Debugger
by Roy Yuen
An evidence-first debugging workflow for agents to identify, reproduce, and surgically fix software defects.
- Identify and fix the source of intermittent flaky test failures
- Debug runtime exceptions by tracing bad values back to their source
- Resolve dependency and import conflicts without breaking the build
$6
· or 30 creditsSecure checkout via Stripe
Included in download
- Identify and fix the source of intermittent flaky test failures
- Debug runtime exceptions by tracing bad values back to their source
- Ready for Claude Code
- Includes example output and usage patterns
Sample input
The auth-flow.spec.ts test is failing with a 401 error on npm test. Debug the root cause and apply a surgical fix.
Sample output
Reproduction: Ran 'npm test' -> Test 'auth-flow.spec.ts' failed with 401. Root Cause: JWT expiration was set to 0 in dev config, causing immediate rejection. Fix: Updated config/dev.json expiry to 3600s. Regression Trace: Added smoke test check_token_validity(). Verification: PASSED.
An evidence-first debugging workflow for agents to identify, reproduce, and surgically fix software defects.
$6
· or 30 creditsSecure checkout via Stripe
Included in download
- Identify and fix the source of intermittent flaky test failures
- Debug runtime exceptions by tracing bad values back to their source
- Ready for Claude Code
- Includes example output and usage patterns
- Instant install
Sample input
The auth-flow.spec.ts test is failing with a 401 error on npm test. Debug the root cause and apply a surgical fix.
Sample output
Reproduction: Ran 'npm test' -> Test 'auth-flow.spec.ts' failed with 401. Root Cause: JWT expiration was set to 0 in dev config, causing immediate rejection. Fix: Updated config/dev.json expiry to 3600s. Regression Trace: Added smoke test check_token_validity(). Verification: PASSED.
Screenshots
About This Skill
What it does
The Root Cause Debugger is a high-precision diagnostic skill for AI agents. Rather than "spraying and praying" with broad code changes, it enforces an evidence-first debugging loop: reproduce, narrow scope, identify root cause, apply a surgical fix, and verify with regression coverage. This prevents the agent from making destructive "guesses" like indiscriminately upgrading dependencies or ballooning timeout values.
Why use this skill
Standard LLMs often attempt to fix bugs by rewriting large swaths of code or tweaking configurations until something works. This skill forces a developer-centric workflow that treats debugging as a science. It is particularly effective for complex issues like flaky tests, runtime exceptions, dependency conflicts, and race conditions where the "where" and "why" are not immediately obvious.
Supported Scenarios
- Failing Tests: Isolates minimal reproductions to find the boundary of failure.
- Runtime Exceptions: Traces value transformations backward to find illegal states.
- Dependency/Build Failures: Audits lockfiles and module formats before suggesting changes.
- Flaky Behavior: Proves race conditions through targeted logging and state inspection.
The output is a structured Handoff Report that documents the exact evidence found, the surgical fix applied, and the automated check added to prevent regressions.
Use Cases
- Identify and fix the source of intermittent flaky test failures
- Debug runtime exceptions by tracing bad values back to their source
- Resolve dependency and import conflicts without breaking the build
- Create minimal reproduction cases for complex production-like incidents
- Apply surgical fixes that maintain project style and architectural boundaries
Known Limitations
- Requires a reproducible environment to function optimally.
- Cannot fix logic errors in proprietary/binary dependencies without source access.
How to Install
mkdir -p ~/.claude/skills && curl -sL https://www.agensi.io/api/install/root-cause-debugger -o /tmp/root-cause-debugger.zip && unzip -o /tmp/root-cause-debugger.zip -d ~/.claude/skills && rm /tmp/root-cause-debugger.zipFree skills install directly. Paid skills require purchase - use the download button above after buying.
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Compatible with SKILL.md-compatible agents like Codex CLI, Claude Code, and Cursor.
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