ThumbGate Verification evidence
comparison | thumbgate vs fallow

# ThumbGate vs Fallow

Fallow finds JS/TS code health issues: dead code, duplication, complexity, and architecture drift. ThumbGate is action-boundary enforcement for AI agents, stopping agents from acting on those signals unsafely.

👍 Thumbs up reinforces good behavior
👎 Thumbs down blocks repeated mistakes

## Why this page exists

- Fallow is complementary, not a direct replacement: it finds dead code, duplication, complexity, and architecture drift.
- ThumbGate governs the next agent action: refactor scope, risky edits, CI proof, team lessons, and pre-action blocks.
- Together, Fallow output can become ThumbGate gates so agents do not blindly refactor everything a static analyzer flags.

## The product difference in one sentence

Fallow tells you where a JavaScript or TypeScript codebase may be unhealthy. ThumbGate governs what AI agents are allowed to do next: make the next edit, command, PR, or publish action.

That distinction matters because analyzer output can be useful and dangerous at the same time. A duplicated block can be safe to refactor, or it can be intentional domain duplication where an agent should stop and ask for evidence.

## Choose Fallow when

- You want static reports for unused code, duplicate blocks, complexity hotspots, circular dependencies, or architecture drift.
- You need JSON diagnostics an agent can inspect before proposing cleanup work.
- Your immediate goal is code health visibility in JS/TS repositories.

## Choose ThumbGate when

- You need pre-action enforcement before an AI agent applies analyzer-driven refactors.
- You want CI and human feedback to become durable prevention rules across Claude Code, Cursor, Codex, Gemini, Amp, Cline, and OpenCode.
- You need audit evidence that a risky cleanup, dependency update, or cross-layer refactor was checked before execution.

## Best together

The highest-ROI workflow is Fallow for deterministic codebase signals and ThumbGate for agent governance. Run the analyzer, pass the changed-file and complexity signals into a ThumbGate gate, then require proof before the agent edits central files or opens a PR.

## FAQ

Is Fallow a competitor to ThumbGate?

Partly adjacent, but mostly complementary. Fallow analyzes JS/TS code health. ThumbGate enforces AI-agent actions before execution. They solve different parts of the agent workflow.

Should ThumbGate integrate with Fallow output?

Yes. Fallow JSON is useful input for ThumbGate gates, especially duplication, complexity, changed-file audit results, and architecture-boundary warnings.