Borrowing it
Nothing to install: this file belongs to travisennis/acai. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/travisennis/acai/master/.agents/skills/fallow/SKILL.mdgit clone --depth 1 https://github.com/travisennis/acaiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/travisennis/acai/fallow)<a href="https://agentmods.dev/skills/travisennis/acai/fallow"><img src="https://agentmods.dev/badge/skills/travisennis/acai/fallow/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/travisennis/acai/fallow"><img src="https://agentmods.dev/badge/skills/travisennis/acai/fallow.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00040 | $0.01613 |
| Opus 5.5 | $0.00016 | $0.00645 |
| Sonnet 5.5 | $0.00008 | $0.00323 |
| Haiku 4.5 | $0.00004 | $0.00161 |
Grade A, and why
fallow scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fallow
Fallow is a Rust-native static analysis tool for TypeScript and JavaScript that finds dead code, duplication, complexity hotspots, and architecture boundary violations. It builds a project-wide module graph, so it catches problems file-local tools cannot: unused exports, files nothing imports, circular dependencies, cross-file duplicate blocks, and boundary violations.
Run fallow after generating or editing code to review the impact, before committing to catch regressions, or when asked to clean up dead code or reduce complexity.
Quick Reference
npx fallow # Full analysis: dead code + duplication + health
npx fallow dead-code # Dead code only
npx fallow dupes # Duplication only
npx fallow health # Complexity and health score
npx fallow audit # Audit changed files (PR gate)
npx fallow fix --dry-run # Preview automatic cleanup
npx fallow --format json # Structured output with per-issue actions
npx fallow --summary # Category counts only
When to Run Fallow
After generating or editing code:
npx fallow --summary
Before committing (audit changed files):
npx fallow audit --base main --format json
When asked to clean up or reduce complexity:
npx fallow --format json
npx fallow health --top 20 # 20 most complex functions
npx fallow dead-code # See what can be removed
Key Commands
Dead Code
Finds unused files, exports, types, dependencies, enum members, class members, circular dependencies, boundary violations, and stale suppressions.
npx fallow dead-code
npx fallow dead-code --unused-exports # Only unused exports
npx fallow dead-code --circular-deps # Only circular dependencies
npx fallow dead-code --production # Exclude test/dev files
npx fallow dead-code --changed-since main # Only files changed vs main
npx fallow dead-code --group-by owner # Group by CODEOWNERS
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 197 lines · 40 tokens per session scan A 3dad2132ba9b
fallow is a skill published in the GitHub repository travisennis/acai (5 stars, last pushed 3mo ago), licensed MIT. It adds 40 tokens to every session and 1,613 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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