dev-container

70 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a devops skill usually runs commands, installs tools and uses cloud credentials.

By Flow-Research/harnessy (GitHub) · devops · 30 stars · scanned at commit bae3fdd

Build a reusable Docker development container baseline with spec-driven validation across Alpine, Debian, Ubuntu, or compatible custom images. Use when a repo needs a configurable dev container, layered tool installs, and a way to verify container state.

Works with any agent that supports SKILL.md skills.

What this skill can do

Changes files outside its own folder

The author does not mention this.

Found in 3 places.

tools/flow-install/skills/dev-container/templates/container/scripts/create-user.sh, line 17mkdir -p /etc/sudoers.d
tools/flow-install/skills/dev-container/templates/container/scripts/create-user.sh, line 18printf '%%wheel ALL=(ALL) NOPASSWD: ALL\n' >/etc/sudoers.d/wheel
tools/flow-install/skills/dev-container/templates/container/scripts/create-user.sh, line 28printf '%%sudo ALL=(ALL) NOPASSWD: ALL\n' >/etc/sudoers.d/devcontainer

Downloads and installs other software

The author does not mention this. Expected for a devops skill.

Found in 5 places.

tools/flow-install/skills/dev-container/templates/container/scripts/installers/apk.sh, line 43python3 -m pip install --break-system-packages --no-cache-dir $(tr '\n' ' ' < <(sort -u "${TMP_PIP_PACKAGES}"))
tools/flow-install/skills/dev-container/templates/container/scripts/installers/apk.sh, line 47npm install -g $(tr '\n' ' ' < <(sort -u "${TMP_NPM_PACKAGES}"))
tools/flow-install/skills/dev-container/templates/container/scripts/installers/apt.sh, line 36apt-get install -y --no-install-recommends $(tr '\n' ' ' < <(sort -u "${TMP_PACKAGES}"))

Show 2 more

tools/flow-install/skills/dev-container/templates/container/scripts/installers/apt.sh, line 45python3 -m pip install --break-system-packages --no-cache-dir $(tr '\n' ' ' < <(sort -u "${TMP_PIP_PACKAGES}"))
tools/flow-install/skills/dev-container/templates/container/scripts/installers/apt.sh, line 49npm install -g $(tr '\n' ' ' < <(sort -u "${TMP_NPM_PACKAGES}"))

Runs commands on your computer

The author does not mention this. Expected for a devops skill.

Found in 4 places.

tools/flow-install/skills/dev-container/templates/container/scripts/validate-container.py, line 34completed = subprocess.run(
tools/flow-install/skills/dev-container/templates/container/scripts/validate-container.py, line 36shell=True,
tools/flow-install/skills/dev-container/templates/container/scripts/validate-container.py, line 38stdout=subprocess.PIPE,

Show 1 more

tools/flow-install/skills/dev-container/templates/container/scripts/validate-container.py, line 39stderr=subprocess.PIPE,

Safer alternatives

Low-risk skills in the same category (devops) that look related. Check that one does what you need.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'dev-container' ] || [ -L ~/.agents/skills/'dev-container' ]; then echo 'A skill folder named dev-container already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/Flow-Research/harnessy' "$d" && git -C "$d" checkout --quiet 'bae3fdddd99eabe649d0d53cea5d2a0b501aa8b3' -- 'tools/flow-install/skills/dev-container' && mkdir -p ~/.agents/skills && cp -R "$d"/'tools/flow-install/skills/dev-container' ~/.agents/skills/'dev-container' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'dev-container' ~/.claude/skills/'dev-container' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-08	`bae3fdd`	70

Also found in

Identical copies of this skill exist at:

Flow-Research/harnessy-v2/packages/capability-harnessy-v1-full/resources/source/tools/flow-install/skills/dev-container