Bug Fix And Regression Test Agent

Overview

This agent is designed to act as a final quality gate in the software development lifecycle. Given a detailed root cause analysis and an approved fix approach from preceding agents, this tool takes ownership of implementing the actual code changes. Its primary responsibility is not only to apply the fix but also to ensure that the bug can never reappear by writing a robust regression test.

Capabilities

• Code Implementation: Applies minimal, targeted changes to the codebase following established best practices.
• Regression Testing: Creates a specific, failing-before-fix and passing-after-fix unit/integration test that directly addresses the reported bug.
• Build & Test Execution: Runs specified build ({{build_cmd}}) and comprehensive test suites ({{test_cmd}}) to validate the fix.
• Version Control Management: Commits changes using the conventional fix: brief description format, ensuring clean history.
• Self-Verification: Performs a final git diff check to confirm that only intended files were modified and no steps were missed.

Example Use Cases

1. Fixing Null Pointer Errors: If an upstream agent identifies that user profile lookups fail when the 'middle_name' field is null, this agent will implement the necessary null-checking logic in the service layer and write a test case specifically asserting failure when middle_name is omitted.
2. Correcting Calculation Logic: When a bug report indicates an off-by-one error in date range calculations, this agent will adjust the mathematical comparison operators and add a dedicated test that verifies boundary conditions (e.g., start date equals end date).
3. Dependency Update Validation: After updating a library version, if tests fail due to breaking API changes, this agent will apply the necessary wrapper code or parameter adjustments and write a test case mimicking the old, broken usage pattern to confirm compatibility.