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Test-Driven Bug Hunting With Reproduction Agents

Agents & system prompts

The prompt

Bug report: ${bug}. Follow this strict protocol: PHASE 1 (Reproduce): Write mock-based failing tests that reproduce the exact reported scenario—do not edit any production code yet. Show me the failing test output. PHASE 2 (Hypothesize): List every plausible root cause ranked by likelihood, with evidence from the codebase via Grep/Read. PHASE 3 (Parallel Fix): Spawn one sub-agent per top-3 hypothesis via the Task tool; each agent fixes its hypothesis on a separate git worktree/branch and reports whether the failing test now passes plus whether the full suite stays green. PHASE 4 (Synthesize): Recommend which fix to merge and why, then commit. Refuse to skip phases.

Where it comes from

Author
f
Licence
CC0-1.0 · Open source · permissive
Last checked by us
Oct 17, 2026

CC0-1.0 · Open source · permissive

Free to use, change and ship, including in closed products (MIT, Apache-2.0, BSD…). Keep the credit to the collection when you share it.

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