Borrowing it
Nothing to install: this file belongs to kubetail-org/kstack. 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/kubetail-org/kstack/main/CLAUDE.mdgit clone --depth 1 https://github.com/kubetail-org/kstackWrote 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/kubetail-org/kstack/claude-md)<a href="https://agentmods.dev/instructions/kubetail-org/kstack/claude-md"><img src="https://agentmods.dev/badge/instructions/kubetail-org/kstack/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/kubetail-org/kstack/claude-md"><img src="https://agentmods.dev/badge/instructions/kubetail-org/kstack/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 | $0.04725 | $0.04725 |
| Opus 5.5 | $0.01890 | $0.01890 |
| Sonnet 5.5 | $0.00945 | $0.00945 |
| Haiku 4.5 | $0.00473 | $0.00473 |
Grade C, and why
kstack CLAUDE.md scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 28d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
- `scripts/bootstrap.sh` — the hosted `curl | bash` getter. Clones an upstream checkout, then execs `$UPSTREAM/scripts/install`. Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `scripts/bootstrap.sh` — the hosted `curl | bash` getter. Clones an upstream checkout, then execs `$UPSTREAM/scripts/install`. How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What this repo is
kstack is a skill pack (not an app) distributed to Claude Code and other agent CLIs. The shipped artifacts are SKILL.md files plus a handful of helper shell scripts in src/bin/. There is no runtime service — everything is POSIX shell rendered/executed at install time or inside an agent session.
Shipped shell (scripts/install, everything under src/bin/ and src/lib/, plus any skill scripts/main) must run on bash 3.2+ — that's what macOS's /usr/bin/bash is, and we don't assume users have a newer bash on PATH. Concretely: no declare -A, no ${var,,}/${var^^}, no mapfile/readarray, no [[ =~ ]] BASH_REMATCH patterns that rely on 4.x fixes, and no &> redirection. The big footgun is set -u + empty arrays: "${arr[@]}" raises unbound variable in 3.2 when arr=(). Either guard iteration with [ ${#arr[@]} -eq 0 ] && continue, or use ${arr[@]+"${arr[@]}"} at the expansion site. Dev-only scripts (scripts/*.sh, tests/**) may assume a newer bash since they only run on CI/contributor machines.
Layout
Split is: src/ = installer payload (what gets copied/rendered into an install root); everything else = dev infra.
Makefile— contributor dev entrypoint. Thin facade overscripts/(make install,make test,make lint, etc.).src/{bin,lib,skills,schemas}/— the payload: sources copied verbatim (bin,lib,schemas) or template-rendered (skills) into an install root.scripts/install— the installer. Reads fromsrc/and writes outputs (.kstack/,.<agent>/skills/) at the repo root in dev mode.scripts/bootstrap.sh— the hostedcurl | bashgetter. Clones an upstream checkout, then execs$UPSTREAM/scripts/install.scripts/{lint,test,test-e2e,test-evals,clean}.sh— repo dev scripts.tests/{unit,integration,e2e,evals,fixtures}/— bats + eval harness. Dev-only; not part of the payload.CLAUDE.md,TODO.md,README.md,LICENSE,assets/,.github/— repo metadata.
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.
- 28d ago Changed · +25 lines · +692 tokens per session 44e4609f8736
- 1mo ago First seen · 95 lines · 4,033 tokens per session scan C bcf3f613f30a
kstack CLAUDE.md is an instructions file published in the GitHub repository kubetail-org/kstack (134 stars, last pushed 29d ago), licensed Apache-2.0. It adds 4,725 tokens to every session, about $0.0189 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). 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.