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Ryan Manuel 4931cf06ff chore: bootstrap AI agent context files (AGENTS.md + CLAUDE.md) (#33429 )

* chore: bootstrap AI agent context files (AGENTS.md + CLAUDE.md)

Adds a three-tier set of AI context files across the monorepo:

- Root AGENTS.md / CLAUDE.md — project overview, workspaces, common
  commands, architecture map, code conventions, and CI/CD summary
- Workspace-level pairs for cli/, packages/, npm/, tooling/,
  system-tests/, and scripts/
- Package-level pairs for all 33 packages/, 15 npm/, 3 tooling/
  packages, and the cli workspace (117 files total)

CLAUDE.md files are thin wrappers (@AGENTS.md import + workflow rules)
so Claude Code picks them up walking upward from cwd. AGENTS.md files
carry the substantive content and are also read natively by Codex CLI
and Cursor.

Command conventions applied throughout:
- No watch / file-watcher commands (agents run once and read results)
- No bare full-suite test runs for large packages; always target a
  specific file (<path-to-spec>) or glob ("<glob-pattern>")
- No cypress:open (interactive mode); use cypress:run with --spec
- Test runner syntax varies by package: vitest (test --),
  mocha (test-unit/test-integration --), jest (--testPathPattern),
  Cypress CT (cypress:run:ct -- --spec)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* gitignore

* clarify AI internal docs and contribution guidelines

* update TOC

* tweak nvm wording

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-09 16:01:52 -05:00

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Tooling Workspace

Purpose

The tooling/ workspace contains internal build and development tooling for the Cypress monorepo. These packages are all marked "private": true and are not published as user-facing packages. They exist to support the Cypress Electron application's startup optimization pipeline — bundling dependencies, creating V8 snapshots, and managing the platform-specific mksnapshot binary.

Package Map

@tooling/electron-mksnapshot — Downloads and runs the mksnapshot binary for a given Electron version on demand, rather than bundling a binary at install time.

@tooling/packherd — Bundles all dependencies reachable from an entry point using esbuild and produces the bundle plus metadata needed for snapshot generation.

@tooling/v8-snapshot — Orchestrates V8 snapshot creation for the Cypress Electron app: bundles modules via @tooling/packherd, runs the Snapshot Doctor to classify modules as healthy/deferred/norewrite, and installs the resulting snapshot blob.

Workspace Commands

Each package follows the same pattern:

yarn workspace @tooling/<name> build         # Compile TypeScript to dist/

# Run a specific unit test file (mocha packages)
yarn workspace @tooling/<name> test-unit -- --grep "<pattern>"
yarn workspace @tooling/<name> test-unit -- <path-to-spec>

# Run a specific integration test file (mocha packages)
yarn workspace @tooling/<name> test-integration -- --grep "<pattern>"
yarn workspace @tooling/<name> test-integration -- <path-to-spec>

yarn workspace @tooling/<name> check-ts      # Type-check without emitting
yarn workspace @tooling/<name> clean         # Remove dist/

Notes

Split runtime/build packages: @tooling/packherd handles only bundling (step 1 of module loading). The runtime module loader (steps 2 and 3 — loading pre-bundled modules and on-demand TypeScript transpilation) lives in @packages/packherd-require.
Split runtime/build packages: @tooling/v8-snapshot handles snapshot generation. The runtime side that loads and uses the snapshot at app startup lives in @packages/v8-snapshot-require.
v8-snapshot build step copies blueprint: The build script for @tooling/v8-snapshot includes cpr ./src/blueprint ./dist/blueprint after tsc because the src/blueprint/ directory contains plain .js files (not TypeScript) that the TypeScript compiler does not copy automatically.
Platform-specific snapshot binaries: @tooling/v8-snapshot depends on optional @cypress/snapbuild-* packages for each target platform. These are used by src/snapbuild/snapbuild.ts and may not be present in all environments; the build falls back to downloading via @tooling/electron-mksnapshot.
Nx implicit dependency: @tooling/v8-snapshot declares @packages/data-context as an implicit Nx dependency, meaning changes to data-context trigger v8-snapshot rebuilds in CI.

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