Fallow is a command-line static-analysis tool that builds a dependency graph of TypeScript and JavaScript code to identify unused code, duplication, circular dependencies, complexity hotspots, boundary violations, and styling drift. It is for developers reviewing codebases and verifying changes, with catalogue entries that add agent, editor, and workflow integrations.
Borrowing it
Nothing to install: this file belongs to fallow-rs/fallow. 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/fallow-rs/fallow/main/CLAUDE.mdgit clone --depth 1 https://github.com/fallow-rs/fallowWrote 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/instructions/fallow-rs/fallow/claude-md)<a href="https://agentmods.dev/instructions/fallow-rs/fallow/claude-md"><img src="https://agentmods.dev/badge/instructions/fallow-rs/fallow/claude-md/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/instructions/fallow-rs/fallow/claude-md"><img src="https://agentmods.dev/badge/instructions/fallow-rs/fallow/claude-md.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 | $0.00370 | $0.00370 |
| Opus 5.5 | $0.00148 | $0.00148 |
| Sonnet 5.5 | $0.00074 | $0.00074 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
fallow CLAUDE.md 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.
What it actually says
Fallow repository adapter for Claude
Fallow is a Rust-native codebase analyzer for JavaScript and TypeScript.
@AGENTS.md @docs/README.md
Both files above are imported: the universal repository contract for Claude,
Codex, and contributors, and the central documentation index. Read
docs/development/task-context-map.md next to load only the references the
current task needs.
Knowledge layers
.agents/skills/is the canonical, client-neutral maintainer workflow tree..claude/skills/is generated from.agents/skills/. Never edit it by hand..claude/rules/contains only Claude-specific, path-scoped constraints.docs/contains durable public maintainer architecture and references..plans/is gitignored task state. Promote durable decisions into indexed public documentation.
Workflow
Use the native lifecycle for non-trivial work:
implementpanel-reviewwhen the change has design or user-facing decisionsreviewshipsweep
The controlling workflow lives in the matching .agents/skills/<name>/SKILL.md.
Do not layer unrelated workflow systems onto this lifecycle.
Trust boundary
This public repository must contain only public OSS knowledge and contracts. Private cloud architecture, operations, customers, commercial context, and incidents belong in the private cloud repository. Public behavior may be documented here or in the public user documentation repository, but private prose must never be copied or automatically exported.
Generated surfaces
Run npm run generate:contracts:check and
npm run check:agent-adapters after changing public contracts or skills.
Generated files identify their source and must not be edited directly.
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 · 48 lines · 370 tokens per session scan A c4d77e53e5ce
fallow CLAUDE.md is an instructions file published in the GitHub repository fallow-rs/fallow (5,273 stars, last pushed today), licensed MIT. It adds 370 tokens to every session, about $0.0015 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.