Night Market Build & Env Bootstrap

Rebuilds the claude-night-market dev environment from a bare machine and verifies it in under an hour, with a documented traps table.

Dev & CodingAdvanced★ 342⑂ 37AI score 7/10Last updated: Oct 6, 2026

What it does

Gives an ordered toolchain table (uv → Python 3.12 → GNU make 3.82+ → ruff/mypy/bandit/pre-commit, plus optional node, Rust, mdbook, gh) with a verify command for every row.
Provides a first-hour verification sequence — git clone, make validate-all, make -C plugins/leyline test, uv run pre-commit install — including the expected output shape for each step.
Explains the repo's three Python tiers: root tooling on 3.12, per-plugin floors from 3.9 to 3.12, and hooks that run under the host system Python outside any venv, with concrete rules (use timezone.utc, never datetime.UTC; guard third-party imports in hook entrypoints).
Documents real traps: the nonexistent setup-uv@v8 bare tag, bandit 1.9 breaking the 3.9 pre-commit env, a stale .uv-tools ruff shadowing PATH, root pytest skipping plugin tests via norecursedirs, imbue coverage artifacts, and make skrills-build missing SKRILLS_REPO.
Ends with exit criteria as a checklist and rg commands to re-verify every pinned number when the snapshot drifts.

Who it's for

New contributors setting up claude-night-market (or a fork) locally.
Maintainers of uv-based multi-Python monorepos looking for a model of how to document environment traps.
Teams burned by hook scripts executing under the system interpreter instead of the project venv.

Example uses

Fresh laptop: clone the repo and ask Claude to "set up the dev environment" — it installs in order and stops only when make validate-all is clean.
Lint results disagree with CI because bare ruff reports 0.7.3 — the traps table points to the .uv-tools shadow and switches you to make lint / uv run ruff.
Every commit fails with ModuleNotFoundError from a hook — the 3.9 hook-tier rules and import-guard guidance fix it.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/athola/claude-night-market/HEAD/.claude/skills/night-market-build-and-env/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)

Download the ZIP with the button below.
In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.

↓ Download ZIP

Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the .claude/skills/night-market-build-and-env folder from the GitHub repo athola/claude-night-market into my ~/.claude/skills/night-market-build-and-env/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/athola/claude-night-market.git /tmp/cnm && mkdir -p ~/.claude/skills && cp -r /tmp/cnm/.claude/skills/night-market-build-and-env ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

Open a terminal and clone the repo to a temp folder: git clone https://github.com/athola/claude-night-market.git /tmp/cnm
Create the skills folder if needed: mkdir -p ~/.claude/skills
Copy just this skill: cp -r /tmp/cnm/.claude/skills/night-market-build-and-env ~/.claude/skills/
Verify with ls ~/.claude/skills/night-market-build-and-env — you should see SKILL.md.
Restart Claude Code and prompt something like "bootstrap and verify the night-market dev environment".
Note: the commands assume you are working inside the claude-night-market repo and already have uv plus GNU make 3.82+ available.

View source on GitHub ↗License: MIT