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Installing a second language bundle into a project silently replaced the first one's config. settings.json and githooks are copied with cp -rT (always overwrite), so installing bash over elisp rewired the validate hook to validate-bash.sh and dropped check-parens from pre-commit, leaving validate-el.sh orphaned on disk. The output said [ok] for both. A project could lose its paren check or secret scan and read the install as success.
The guard detects which bundles a project already has, by the same rule fingerprint sync-language-bundle uses, and refuses when the incoming bundle would overwrite a file another one ships. It names each file at risk. FORCE=1 still overrides, and the message says that also re-seeds CLAUDE.md, which is destructive on a customized project.
Only three of the five shared filenames actually collide. gitignore-add.txt is appended and deduped, and CLAUDE.md is seed-only, so both compose across bundles already.
This doesn't decide whether polyglot projects are supported, and the guard shouldn't be read as "no". A non-overlapping pair still installs: bash ships settings.json and githooks with no coverage fragment, python ships only a coverage fragment, so the two compose today. The real line is overlap, not polyglot, and nothing chose it. The open question, along with the identical coverage target names both fragments define, is filed.
home reported this after scaffolding clock-panel with python and typescript, which hit the coverage fragment. The settings.json and githooks cases are worse and hadn't been noticed. No project was damaged: the three bundles that collide aren't doubled up anywhere.
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install-lang only seeded CLAUDE.md if the chosen bundle shipped one. elisp and go do, python and typescript don't. A project installing a template-less bundle got no CLAUDE.md, and a multi-bundle install inherited whichever bundle shipped one. A bash project that installed elisp and python ended up headed "Elisp project," worse than no header.
I added a language-neutral default (languages/default-CLAUDE.md) that names no language, so single-language, multi-bundle, and wrong-bundle installs all get an accurate "fill this in" header instead of a false one. Per-bundle templates still win where present. The seed-on-first-install, no-overwrite logic is unchanged.
I hardened the Makefile LANGUAGES glob to directories only so the new template file doesn't show up as a selectable language. lint covers the default. The install-lang tests cover the fallback, the bundle-wins branch, and no-overwrite.
A bash bundle is still the real gap for shell-heavy projects, filed as a backlog task.
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detection
A line-weighted coverage total has a blind spot: a module no test loads never shows up in the SimpleCov report, so it can't drag the number down. The suite looks healthier than it is. This adds a summary that counts every source file on disk against the report and treats an absent file as 0%, weighting the project number by file instead of by line so untested modules stay visible.
The script ships at languages/elisp/claude/scripts/coverage-summary.el, self-contained on stock Emacs (just the built-in json). It parses the undercover SimpleCov shape directly rather than depending on the editor's coverage engine, so it runs anywhere the bundle lands. I proved it against a real 103-file report: 93 tracked, 27 untested modules surfaced, project number 66.4%.
Delivery follows the bundle convention. The script lives under the gitignored .claude/ footprint and gets auto-fixed on drift by sync-language-bundle.sh, which I made generic for any claude/scripts/* rather than coverage-specific. The Makefile targets ship as a project-owned fragment (languages/elisp/coverage-makefile.txt) that install-lang.sh seeds at the project root and sync drops into .ai/inbox/ when that convention exists. The bundle never edits the project's own Makefile.
Tests: 12 ERT for the kernel (Normal/Boundary/Error per function), wired into make test via a new languages/*/tests/ discovery path, plus bats for the sync auto-fix and the inbox-drop guards.
This is the Elisp pilot. The pattern is proven, so fanning out to Python, Go, and TypeScript is now a follow-up. Each one needs only its own parser and fragment. The plumbing is already generic.
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claude-rules/testing.md is now language-agnostic (TDD principles, test
categories, coverage targets, anti-patterns). Scope header widened to
**/*. Python-specific content (pytest, fixtures, parametrize, anyio,
Django DB testing) moved to languages/python/claude/rules/python-testing.md.
Added languages/python/ bundle (rules only so far; no CLAUDE.md template
or hooks yet — Python validation tooling differs from Elisp). Added
install-python shortcut to the Makefile.
Updated scripts/install-lang.sh to copy claude-rules/*.md into each
target project's .claude/rules/. Bundles no longer need to carry their
own verification.md copy — deleted languages/elisp/claude/rules/verification.md.
Single source of truth in claude-rules/, fans out via install.
Elisp-testing.md now references testing.md as its base (matches the
python-testing.md pattern).
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Introduces a second install mode alongside the existing global symlinks:
per-project language bundles that copy a language-specific Claude Code
setup (rules, hooks, settings, pre-commit) into a target project.
Layout additions:
languages/elisp/ - Emacs Lisp bundle (rules, hooks, settings, CLAUDE.md)
scripts/install-lang.sh - shared install logic
Makefile additions:
make help - unified help text
make install-lang LANG=<lang> PROJECT=<path> [FORCE=1]
make install-elisp PROJECT=<path> [FORCE=1] (shortcut)
make list-languages - show available bundles
Elisp bundle contents:
- CLAUDE.md template (seed on first install, preserved on update)
- .claude/rules/elisp.md, elisp-testing.md, verification.md
- .claude/hooks/validate-el.sh (check-parens, byte-compile, run matching tests)
- .claude/settings.json (permission allowlist, hook wiring)
- githooks/pre-commit (secret scan + staged-file paren check)
- gitignore-add.txt (append .claude/settings.local.json)
Hooks use \$CLAUDE_PROJECT_DIR with a script-relative fallback, so the
same bundle works on any machine or clone path. Install activates git
hooks via core.hooksPath=githooks automatically. Re-running install is
idempotent; CLAUDE.md is never overwritten without FORCE=1.
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