[amondnet]

Summary

Adds project language detection to the CLI and a --lang flag that selects which language rule guides init, update, and doctor use. This covers section 2 (language detection) of #65.

• Detection (root only). Markers at the project root map to a guide: package.json / tsconfig.json → typescript, pubspec.yaml → dart, Cargo.toml → rust, build.gradle(.kts) / pom.xml → java (no Kotlin guide ships), go.mod → go, pyproject.toml → python. Several languages can match at once. Detection depth decision: root only, no workspace walking.
• --lang <list>. A comma-separated list of ids (the rules/<id>.md names) overrides detection. An unknown value exits 1 and lists the accepted languages. --lang ko|en stays as the deprecated locale alias, and a mix such as ko,dart is rejected.
• init. Detected languages are pre-selected in a multiselect. --yes uses the detection result.
• update. Keeps the languages the existing AGENTS.md block already links, which answers the feat(cli): detect languages, run without package.json, and split rules into rules/<lang>.md #65 open question "where to record the selected languages". --lang overrides it. A legacy or missing block falls back to detection.
• AGENTS.md block. Links the general guide plus each selected guide. The TypeScript-specific bullets appear only when typescript is selected.
• doctor. Prints the detected languages.
• Docs. Help text, both READMEs, both cli.mdx pages, and the rules.md index.

Related issue

Refs #65 (stays open: this is one step of it).

Notes for reviewers

• The old test asserting that --lang dart is an error was replaced, because dart is now a valid language.
• The invalid-locale result no longer carries a flag field.
• Existing AGENTS.md tests now write a package.json fixture so the TypeScript expectations still hold.
• Still out of scope, left for later steps of feat(cli): detect languages, run without package.json, and split rules into rules/<lang>.md #65: running without a package.json, and writing guides into the project instead of node_modules.

Verification

• 285 tests pass, 0 fail.
• tsc clean, eslint clean, docs build and lint:docs clean.
• Manual smoke of init, update, and doctor in a project with package.json and pubspec.yaml.

Checklist

• PR title follows Conventional Commits
• Packages build (bun run build)
• Lint/format pass (bun run lint)
• Documentation updated if behavior changed
• No breaking change, or a BREAKING CHANGE: note is included

---

Summary by cubic

Adds project language detection to the CLI and a --lang flag that selects which language rule guides init, update, and doctor use.

New Features

• Detects languages from root marker files (package.json/tsconfig.json, pubspec.yaml, Cargo.toml, build.gradle(.kts)/pom.xml, go.mod, pyproject.toml)
• --lang <list> overrides detection; unknown values exit 1 and list accepted languages
• init pre-selects detected languages; update keeps the languages the existing AGENTS.md block links, falling back to detection for legacy or missing blocks
• doctor reports detected languages, or the --lang selection when given
• AGENTS.md block links the general guide plus each selected guide, with TypeScript bullets only for typescript

Behavior Changes

• --lang ko|en stays a deprecated locale alias and now selects no languages; mixes like ko,dart are rejected

^{Written for commit a3aa56b. Summary will update on new commits.}

Demo

[gemini-code-assist]

Code Review

This pull request introduces programming language detection and language-specific rule linking to the CLI. It adds a --lang <list> flag, implements automatic language detection from root marker files, and updates the init, update, and doctor commands to support these languages. The AGENTS.md generation is refactored to dynamically link the general guide and the selected language guides, conditionally including TypeScript rules. Feedback suggests moving TypeScript-specific test mirroring examples and framework mentions from the general block (AGENTS_GENERAL) to the TypeScript-specific block (AGENTS_TYPESCRIPT) to prevent irrelevant noise in non-TypeScript projects.

[codacy-production]

Not up to standards ⛔

🔴 Issues 1 high

Alerts:
⚠ 1 issue (≤ 0 issues of at least minor severity)

Results:
1 new issue

Category	Results
Security	1 high

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🟢 Metrics 67 complexity · 0 duplication

Metric	Results
Complexity	67
Duplication	0

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[gemini-code-assist]

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[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no actionable issues remain.

Summary

Adds root-level language detection and --lang selection for rule guides.

• CLI commands detect project languages and accept explicit guide lists.
• AGENTS.md links to the general guide and the selected language guides.

_{Reviews (3) · Last reviewed commit: "chore(cli): apply AI code review suggest..." · Reviewed by Greptile}

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[cubic-dev-ai]

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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