Borrowing it
Nothing to install: this file belongs to ChrisSc/claude-devcontainer. 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/ChrisSc/claude-devcontainer/main/CLAUDE.mdgit clone --depth 1 https://github.com/ChrisSc/claude-devcontainerWrote 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/chrissc/claude-devcontainer/claude-md)<a href="https://agentmods.dev/instructions/chrissc/claude-devcontainer/claude-md"><img src="https://agentmods.dev/badge/instructions/chrissc/claude-devcontainer/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/chrissc/claude-devcontainer/claude-md"><img src="https://agentmods.dev/badge/instructions/chrissc/claude-devcontainer/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 | $0.01860 | $0.01860 |
| Opus 5.5 | $0.00744 | $0.00744 |
| Sonnet 5.5 | $0.00372 | $0.00372 |
| Haiku 4.5 | $0.00186 | $0.00186 |
Grade B, and why
claude-devcontainer CLAUDE.md scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 23d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
`ENTRYPOINT` = `entrypoint.sh`, in order: (1) `sudo init-firewall.sh`, How it starts
The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
claude-sandbox
A modernized, security-sandboxed dev container that is a self-contained home for
Claude Code. Container definition + config, not an app — the deliverable is the
image and its startup behavior; there's nothing to run on the host. Everything lives
in .devcontainer/.
What this repo is (and isn't)
- Target runtime: any Docker host on arm64 or amd64 — native Linux, Docker
Desktop on macOS, or Windows WSL2. Support is gated on arch, not OS
(everything runs in a Linux container;
install-tools.sherrors on non-arm64/amd64). Builds native to the host arch — noplatform:pin (would force slow emulation). Native Linux runs the firewall fully (iptables/ipset in-kernel); macOS/Windows add a Docker Desktop VM layer — the source of the inode-pinned bind-mount and WSL2-vs-Hyper-V firewall caveats. - Scripts must stay LF (enforced by
.gitattributes+ a defensivesed 's/\r$//'in the Dockerfile); CRLF from a Windows checkout breaks the entrypoint withbad interpreter: …^M. The firewall needs Docker's WSL2 backend on Windows (NET_ADMIN + iptables/ipset); the legacy Hyper-V backend won't load the rules.
Build & run
docker compose -f .devcontainer/compose.yaml up -d --build # or: make up
docker exec -it claude-code zsh -l # or: make shell
Compose project (group) = claude; container = claude-code. Makefile targets are
self-documented — each carries a trailing ## … description.
Startup order (load-bearing)
ENTRYPOINT = entrypoint.sh, in order: (1) sudo init-firewall.sh,
(2) seed-claude.sh, (3) claude update (bounded by timeout, non-fatal),
(4) init-aws-toolkit.sh, (5) init-cron.sh, then execs the compose command
(sleep infinity). Ordering matters — the firewall must be up before the
auto-update reaches downloads.claude.ai, before the AWS skill catalog is
fetched, and before cron jobs fire; the AWS step runs after the update so it
drives the current claude CLI. The VS Code path re-runs firewall + update +
aws-toolkit + cron via devcontainer.json postStartCommand as an idempotent
safety net.
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.
- 23d ago Changed · +1 lines · +35 tokens per session 6e1de25d075d
- 2mo ago First seen · 107 lines · 1,825 tokens per session scan B 7920e10749e1
claude-devcontainer CLAUDE.md is an instructions file published in the GitHub repository ChrisSc/claude-devcontainer (2 stars, last pushed 23d ago), licensed MIT. It adds 1,860 tokens to every session, about $0.0074 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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.