Borrowing it
Nothing to install: this file belongs to richardthe3rd/cambridge-beer-festival-app. 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/richardthe3rd/cambridge-beer-festival-app/main/.claude/skills/build-and-env/SKILL.mdgit clone --depth 1 https://github.com/richardthe3rd/cambridge-beer-festival-appWrote 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/skills/richardthe3rd/cambridge-beer-festival-app/build-and-env)<a href="https://agentmods.dev/skills/richardthe3rd/cambridge-beer-festival-app/build-and-env"><img src="https://agentmods.dev/badge/skills/richardthe3rd/cambridge-beer-festival-app/build-and-env/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/skills/richardthe3rd/cambridge-beer-festival-app/build-and-env"><img src="https://agentmods.dev/badge/skills/richardthe3rd/cambridge-beer-festival-app/build-and-env.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 | $0.00208 | $0.06252 |
| Opus 5 | $0.00104 | $0.03126 |
| Sonnet 5 | $0.00042 | $0.01250 |
| Haiku 4.5 | $0.00021 | $0.00625 |
Grade B, and why
build-and-env scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
cat .claude/settings.json How it starts
The opening of the file, as written. The whole thing — 356 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build and Environment
This repo's entire toolchain is driven by mise, bootstrapped by a single
committed script. There is no "install Flutter yourself" path — ./bin/mise
is the only supported entrypoint, and every fact below was verified against
the working tree on 2026-07-02 (see Provenance).
1. From-scratch recreation
./bin/mise (bin/mise:1-345) is a self-contained bootstrap script, not a
thin wrapper around a pre-installed mise binary:
- Pins
MISE_INSTALL_PATH="$project_dir/.mise/mise-2026.5.8"and redirects every mise data/config/cache/state directory under.mise/(bin/mise:6-11) — nothing touches$HOME/.config/mise(explicitly ignored, line 13) or a system-wide mise install. The project is marked trusted automatically (MISE_TRUSTED_CONFIG_PATHS, line 12). - If
.mise/mise-2026.5.8doesn't exist, it downloads the matching OS/arch tarball from GitHub releases (ormise.en.devmirror) and verifies it against a hardcoded SHA256 checksum table baked into the script (bin/mise:134-149) before extracting — not just a checksum fetched from the same untrusted source. - Then it
execs straight into the freshly-installed (or already-present) binary with all your original arguments (bin/mise:345).
Never run raw flutter, dart, npm, etc. — they may resolve to a
different version than CI. Always ./bin/mise run <task> or
./bin/mise exec -- <cmd>.
First-run sequence
./bin/mise run check & # background: generate → format + analyze + test + shell:check
check's dependency chain (mise.toml:75-78) forces, as a side effect:
[deps.flutter] auto=true(mise.toml:24-25) — firstflutter-touching task triggersflutter pub getautomatically.generate—dart run build_runner build --delete-conflicting-outputs, producing.mocks.dartfiles consumed byanalyze/test.flutter analyzeandflutter test.
Installation of flutter=3.47.1, node=22, shellcheck=0.9.0, shfmt=3.8.0
(mise.toml:18-22) happens transparently the first time any task needs them —
there is no separate mise install step required, though ./bin/mise install
works too and is what the SessionStart hook runs (§3c). If check fails on a
fresh machine due to missing system deps or no network for dev tools, fall
back to ./bin/mise deps & to just fetch pub dependencies.
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.
- 12d ago First seen · 356 lines · 208 tokens per session scan B de4808313641
build-and-env is a skill published in the GitHub repository richardthe3rd/cambridge-beer-festival-app (2 stars, last pushed yesterday), licensed MIT. It adds 208 tokens to every session and 6,252 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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