diff --git a/AGENTS.md b/AGENTS.md
index 8bc23b79d..0ad547a1b 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -15,6 +15,7 @@ If you load the Impeccable skill from `.agents/skills/impeccable/SKILL.md` (or a
 - `bun run rebuild` - clean and rebuild everything from scratch.
 - `bun test tests/build.test.js` - run a focused Bun test.
 - `bun run test` - run the full Bun + Node test suite.
+- `bun run test:live-e2e` - opt-in live-mode E2E against framework fixtures (~2 min; needs `npx playwright install chromium` once).
 - `bun run build:browser` / `bun run build:extension` - rebuild browser-specific bundles.
 
 Run `bun run build` after changing anything in `source/`, transformer code, or user-facing counts.
@@ -27,6 +28,8 @@ Use ESM, semicolons, and the existing two-space indentation style in JS, HTML, a
 
 Tests use Bun’s test runner plus Node’s built-in `--test`. Name tests `*.test.js` or `*.test.mjs` and place new fixtures near the behavior they cover, usually under `tests/fixtures/`. Prefer targeted test runs while iterating, then finish with `bun run test`. If you change generated outputs or provider transforms, verify both source parsing and at least one affected provider path in `dist/`.
 
+For changes to `source/skills/impeccable/scripts/live-*.{mjs,js}`, also run `bun run test:live-e2e` (kept out of the default suite because it does real `npm install` per fixture and boots framework dev servers). Scope to one fixture with `IMPECCABLE_E2E_ONLY=<fixture-name>` while iterating; pass `IMPECCABLE_E2E_DEBUG=1` for page-DOM and dev-server-log dumps on failure. Schema and authoring guide for new fixtures live in `tests/framework-fixtures/README.md`.
+
 ## Commit & Pull Request Guidelines
 
 Recent history favors short, imperative subjects such as `Fix: ...`, `Add ...`, `Improve ...`, or `Bump ...`. Keep commits focused and explain the user-facing impact when it is not obvious. PRs should summarize what changed, list validation performed, and call out regenerated artifacts like `dist/` or `build/`. Include screenshots for visible `public/` changes and mention affected providers when transform behavior changes.
diff --git a/CLAUDE.md b/CLAUDE.md
index 23e40722e..b0864c043 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -104,13 +104,32 @@ Local state files inside harness directories (e.g. `.claude/scheduled_tasks.lock
 ## Testing
 
 ```bash
-bun run test       # Run all tests
+bun run test            # Default suite: unit + static framework fixtures
+bun run test:live-e2e   # Opt-in: full-cycle live-mode E2E across framework fixtures
 ```
 
 Unit tests (build orchestration, detector logic) run via `bun test`. Fixture tests (jsdom-based HTML detection) run via `node --test` because bun is too slow with jsdom. The `test` script handles this split automatically.
 
 **Important:** `tests/build.test.js` uses `spyOn(transformers, 'transformCursor')` with the named exports from `scripts/lib/transformers/index.js`. Those named exports (`transformCursor`, `transformClaudeCode`, etc.) are kept specifically for test spying, even though `build.js` itself uses `createTransformer + PROVIDERS` directly. **Do not delete them as "dead code"** — I made that mistake once and broke 8 tests.
 
+### Live-mode E2E
+
+`tests/live-e2e.test.mjs` drives the entire user flow (handshake → pick → Go → cycle → accept → carbonize cleanup) against every fixture in `tests/framework-fixtures/` that declares a `runtime` block. Each fixture installs real deps, boots its framework dev server (Vite, Next, SvelteKit, Astro, Nuxt static), and runs Playwright Chromium against a deterministic fake agent that produces realistic variants in the exact format `reference/live.md` describes.
+
+```bash
+bun run test:live-e2e                                       # full suite, ~2 min, 19 fixtures
+IMPECCABLE_E2E_ONLY=vite8-react-modal bun run test:live-e2e # scope to one fixture
+IMPECCABLE_E2E_DEBUG=1 bun run test:live-e2e                # dump page DOM + dev-server tail on failure
+```
+
+**One-time setup**: `npx playwright install chromium` (the suite uses a specific Chromium build keyed to the bundled Playwright version).
+
+**Kept out of the default `bun run test`** because (a) it does real `npm install` per fixture, (b) it boots framework dev servers, (c) wall time is ~2 minutes, and (d) it requires Playwright's browser cache. Run it locally before shipping changes to anything in `source/skills/impeccable/scripts/live-*.{mjs,js}`.
+
+The agent is pluggable via a one-method interface in `tests/live-e2e/agent.mjs`: `generateVariants(event, context) → { scopedCss, variants[] }`. The default fake agent emits canned variants that exercise all three param kinds (`range`, `steps`, `toggle`). A future LLM-backed agent slots in by implementing the same shape; the orchestrator (wrap, write, accept, carbonize) is agent-agnostic.
+
+Adding a new fixture is a matter of cloning a directory under `tests/framework-fixtures/`, swapping the source files, and writing a `fixture.json`. See `tests/framework-fixtures/README.md` for the full schema.
+
 ## CLI
 
 The CLI lives in this repo under `bin/` and `src/`. Published to npm as `impeccable`.