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How Nested Analysis Loops Catch Bugs Before They Commit

The commit is not where you should catch bugs. The analysis loop is. Here's how separating phase loops from program loops changes what your AI coding agent catches before it touches the repo.

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The commit is not where you should catch bugs. The analysis loop is.

Here's the pattern that changes everything: each phase has its own feedback loop, separate from the program loop.

Two Loops, Not One

Most AI coding workflows are one big loop: - Write code → Run it → Looks good → Commit

Ralph Workflow separates concerns:

PHASE LOOP (inside each phase)
  build → analyze → revise → analyze → ... → commit

PROGRAM LOOP (between phases)
  plan → [phase loop] → develop → [phase loop] → commit → plan (fresh)

The phase loop catches implementation mistakes. The program loop catches direction errors.

What Analysis Actually Does

Analysis isn't a manual code-reading checkpoint. It's running the code against the spec, automatically.

The analysis agent checks: 1. Does the diff match the spec item? 2. Does it break existing tests? 3. Are there obvious bugs? 4. Is the code readable?

If any check fails, the loop goes back with specific feedback — not a generic "something went wrong."

Why This Matters for Unattended Runs

Without this, unattended runs are just unattended bug creation. With it, the loop acts as an automated senior developer review on every commit.

This is the difference between "it ran" and "it's correct."

The Real Win: You Don't Debug After the Fact

A single-loop workflow means you review the commit and find the bug yourself, then start another run. A nested-loop workflow means the analysis phase catches it before you ever see the commit.

Every bug caught in the analysis loop is a bug you don't have to find, file, and fix yourself. Over an overnight run with 20+ commits, that might be the difference between waking up to a working feature and waking up to a broken branch.

Try it on your own backlog tonight. Pick one task that outgrew a single AI coding session. Write a one-paragraph spec, run it through Ralph Workflow, and ask yourself tomorrow morning: would you merge the output?

Ralph Workflow is free and open source. It runs the coding agents you already have on your own machine.

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