Borrowing it
Nothing to install: this file belongs to Christian-Katzmann/app-it. 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/Christian-Katzmann/app-it/main/AGENTS.mdgit clone --depth 1 https://github.com/Christian-Katzmann/app-itWrote 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/christian-katzmann/app-it/agents-md)<a href="https://agentmods.dev/instructions/christian-katzmann/app-it/agents-md"><img src="https://agentmods.dev/badge/instructions/christian-katzmann/app-it/agents-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/christian-katzmann/app-it/agents-md"><img src="https://agentmods.dev/badge/instructions/christian-katzmann/app-it/agents-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 | $0.01158 | $0.01158 |
| Opus 5.5 | $0.00463 | $0.00463 |
| Sonnet 5.5 | $0.00232 | $0.00232 |
| Haiku 4.5 | $0.00116 | $0.00116 |
Grade A, and why
app-it AGENTS.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 1mo 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 — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Operating notes for AI agents (and humans) working on the app-it repo itself — not on a project that app-it is packaging. If you're here to use the skill, read the README and SKILL.md instead.
Safe first command
git status --short # see what's dirty before touching anything
Verify — the one command
./scripts/validate.sh
It checks manifest shape, shell syntax (bash -n), plist lint, a Swift typecheck of wrapper.swift, claude plugin validate (when the CLI is present), and guards against leaked local paths and unresolved template placeholders. CI runs the same script on macos-latest. Green here is the bar for every change.
What this repo is
Three sibling plugins, each packaged for two assistants (Claude Code + Codex). That's why some files look duplicated — they aren't:
app-it(macOS, proven, daily use) — runs a project's dev server behind a native window.plugins/app-it/skills/app-it/SKILL.md(+templates/).app-it-static(macOS, companion) — serves a finished build (no dev server).plugins/app-it-static/skills/app-it-static/SKILL.md(+templates/).app-it-windows(beta scaffold, maintainer wanted) — the Windows sibling.plugins/app-it-windows/skills/app-it-windows/SKILL.md.
Each plugin has Claude packaging (.claude-plugin/) and Codex packaging (.codex-plugin/ + the shared .agents/plugins/marketplace.json). A plugin's manifests carry the same version (the coupling is per-plugin, not across plugins). validate.sh asserts it; releases bump them together (see docs/RELEASE_CHECKLIST.md).
app-it-static reuses five app-it templates byte-for-byte — wrapper.swift, desktop-icons.sh, desktop-install.sh, info-plist-template.xml, placeholder-icon-gen.sh. Each plugin must be self-contained for marketplace install, so they're duplicated, but validate.sh diffs them and fails on drift. If you change launcher internals, edit app-it's copy and re-sync app-it-static's — never let them diverge.
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.
- 1mo ago First seen · 53 lines · 1,158 tokens per session scan A e31c526aeb17
app-it AGENTS.md is an instructions file published in the GitHub repository Christian-Katzmann/app-it (215 stars, last pushed 27d ago), licensed MIT. It adds 1,158 tokens to every session, about $0.0046 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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.