WebEmbedding MCP Server

webEmbedding

webEmbedding is a source-first website cloning engine for AI coding agents: it captures live pages with Playwright, replays network evidence from HAR artifacts, rebuilds only when direct reuse is blocked, and self-verifies the result.

It ships as a Skill + MCP server. Instead of asking a model to "clone this site" from a screenshot, it inspects the URL, chooses a reuse or rebuild route, captures DOM/runtime HTML/styles/assets/network traces, generates bounded frontend reconstruction artifacts, and checks the output with visual, DOM, computed-style, interaction, and responsive-breakpoint verification.

GitHub listing, social preview, and launch-copy recommendations are in docs/github-listing.md.

Current Status

The current pipeline is strongest for static and semi-static web pages:

• company, brand, marketing, and documentation pages
• public landing pages
• iframe-blocked pages that need capture-based reconstruction
• responsive page snapshots across desktop, tablet, and mobile

It is not a full backend or app-logic clone engine. Login-only screens, app-first or native-app-required services, captcha-heavy sites, maps, games, canvas/WebGL-heavy pages, real-time feeds, payments, booking flows, and private server behavior still need separate handling.

Operationally, the repo is now a production-candidate clone engine for URL-based capture and bounded reconstruction: jobs can be queued, network evidence can be replay-audited from HAR artifacts, authenticated dashboard runs can be driven from user-owned browser state, and local gates verify the route corpus, score checks, package contents, and CI wiring. The remaining hard boundary is server-side product behavior, not front-end evidence capture and reconstruction.

Measured Checkpoints

Recent local benchmark runs from this repo:

These are generated by the local self-verify pipeline, not manually assigned ratings. The reproducible commands and score thresholds are tracked in docs/benchmark-evidence.json. Production readiness gates are tracked in docs/production-pipeline-gates.json.

Core Features

• Source-first routing:
  • direct iframe or embed reuse when it is safe and frameable
  • original preview, export, remix, or source routes when available
  • bounded rebuild only when exact reuse is unavailable
• Live browser capture:
  • DOM snapshot
  • runtime HTML
  • full-page screenshot
  • computed style summaries
  • CSS analysis
  • asset inventory
  • HAR-like network metadata
  • interaction states and replay traces
  • storage state export for session-aware flows
• Blocked-site rebuild:
  • handles X-Frame-Options and CSP-blocked pages by rebuilding from captured evidence
  • generates reusable frontend reconstruction artifacts from captured page structure
  • preserves custom tags, shadow-root host structure, and semantic document structure where captured
• Evidence limitation reporting:
  • separates directly captured artifacts from inferred or missing evidence in reproduction results and prompts
  • marks app-gated, auth-gated, and native-app-led surfaces as bounded evidence, with recommendations for user screenshots or authenticated session capture
• Operational failure classification:
  • reports typed pipeline action codes such as network-replay-limited, auth-session-missing, public-app-gate, and canvas-visual-fallback
  • exposes HAR/network replay_readiness before treating captured network evidence as replay-grade
• Production pipeline helpers:
  • filesystem-backed async clone job queue with durable JSON records, worker locks, retry scheduling, cancellation, and manifest annotation
  • deterministic HAR replay engine for standard HAR, near-HAR, and captured network/manifest.json artifacts
  • authenticated dashboard live corpus runner that accepts user-provided storage_state_path or user_data_dir outside the repo
• Self-verification:
  • screenshot similarity
  • DOM snapshot similarity
  • computed-style similarity
  • hover/focus/click interaction state parity
  • interaction trace parity
  • desktop/mobile/tablet breakpoint reports
• Responsive benchmark support:
  • primary desktop viewport: 1440x1200
  • tablet profile: 768x1024
  • mobile profile: 390x844
• Repair loop:
  • bounded self-repair can run when the first scaffold misses the readiness threshold

Install

Requirements

• Node.js 18 or newer
• Python 3.9 or newer
• Chrome or Chromium available locally for Playwright runtime capture

The package uses playwright-core; it does not download a browser by itself.

Installing this project adds the source-first-clone plugin bundle, the exact-clone-intake skill, and the MCP server that exposes the URL inspection, capture, rebuild, and verification tools.

Install From npm

npm install -g web-embedding
web-embedding install
web-embedding doctor

Clone a public URL after installing:

web-embedding clone \
  --url https://developer.mozilla.org/en-US/ \
  --output-dir ./.tmp/mdn-clone \
  --wait-seconds 2 \
  --timeout-seconds 35 \
  --breakpoints mobile tablet

If you already have an older local plugin installed, overwrite it with:

web-embedding install --force
web-embedding doctor

You can also run the installer without a global install:

npx web-embedding install

Use As An MCP Server

For MCP clients that can launch npm stdio servers:

{
  "mcpServers": {
    "source-first-clone": {
      "command": "npx",
      "args": ["-y", "web-embedding@latest", "mcp"]
    }
  }
}

For local smoke testing:

npx web-embedding@latest mcp

The MCP Registry identity is io.github.jongko54/web-embedding; server.json and package.json#mcpName are kept in sync for registry ownership verification.

Hosted Apps SDK Intake Endpoint

The public remote MCP intake endpoint for Apps SDK Developer Mode is:

https://webembedding-mcp.vercel.app/mcp

It exposes low-risk source-first routing tools such as URL inspection, embed candidate discovery, clone-mode classification, and embed snippet generation. Full browser capture, HAR replay, queues, bounded rebuilds, and one-pass clone execution remain local-first through the stdio MCP package.

Apps SDK review pages are hosted alongside the endpoint: https://webembedding-mcp.vercel.app/privacy.html, https://webembedding-mcp.vercel.app/terms.html, and https://webembedding-mcp.vercel.app/submission.html.

Agent Marketplaces

This repository includes marketplace metadata for the two local agent surfaces:

• Codex: .agents/plugins/marketplace.json points to ./bundle/source-first-clone.
• Claude Code: .claude-plugin/marketplace.json points to the same bundle and the bundle includes .claude-plugin/plugin.json.

Claude Code users can add the marketplace from GitHub with:

/plugin marketplace add jongko54/webEmbedding
/plugin install source-first-clone@webembedding

AI auto-selection expectations and golden prompts live in docs/ai-distribution.md and evals/ai-selection/webembedding-golden-prompts.json.

Install From Release

curl -fsSL https://github.com/jongko54/webEmbedding/releases/latest/download/install.sh | bash

Install From This Checkout

git clone https://github.com/jongko54/webEmbedding.git
cd webEmbedding
npm install
node ./bin/web-embedding.mjs install
node ./bin/web-embedding.mjs doctor

Install Into A Temporary Home

Useful for testing without touching your real agent home:

python3 python/web_embedding/installer.py install --target-home ./.tmp/home
python3 python/web_embedding/installer.py doctor --target-home ./.tmp/home
python3 python/web_embedding/installer.py uninstall --target-home ./.tmp/home

Opt-in Telemetry

Telemetry is disabled by default. On an interactive first install, web-embedding install asks once and defaults to No. Non-interactive installs such as CI and curl | bash do not prompt. If you opt in, web-embedding sends a small anonymous command-completion event to a JSON POST endpoint you control. It does not send target URLs, local paths, captured HTML, screenshots, storage state, environment variables, API keys, or command output.

Enable it during install:

web-embedding install --telemetry --telemetry-endpoint https://your-collector.example/events

Or manage it later:

web-embedding telemetry enable --endpoint https://your-collector.example/events
web-embedding telemetry status
web-embedding telemetry disable
web-embedding telemetry reset-id

Each event contains an anonymous install id, package version, command name, success/failure status, OS/runtime basics, and coarse option flags such as breakpoint_count or install_source.

Environment controls:

WEB_EMBEDDING_TELEMETRY=1
WEB_EMBEDDING_NO_TELEMETRY=1
WEB_EMBEDDING_TELEMETRY_PROMPT=0
WEB_EMBEDDING_TELEMETRY_ENDPOINT=https://your-collector.example/events
WEB_EMBEDDING_TELEMETRY_LOG=./telemetry.jsonl

Run a local/self-hosted JSONL collector:

npm run telemetry:collector -- --host 127.0.0.1 --port 8765 --out ./telemetry.jsonl
WEB_EMBEDDING_TELEMETRY=1 \
WEB_EMBEDDING_TELEMETRY_ENDPOINT=http://127.0.0.1:8765/events \
web-embedding doctor

Summarize collected usage:

npm run telemetry:summarize -- ./telemetry.jsonl

The summary includes install and clone executions, total command executions, unique anonymous install IDs, command counts, and version counts. See docs/telemetry.md for collector and analyzer details.

Quick Start

Inspect a URL and get route hints:

node ./bin/web-embedding.mjs inspect \
  --url https://developer.mozilla.org/en-US/

Run the full clone workflow:

node ./bin/web-embedding.mjs clone \
  --url https://developer.mozilla.org/en-US/ \
  --output-dir ./.tmp/mdn-clone \
  --wait-seconds 2 \
  --timeout-seconds 35 \
  --breakpoints mobile tablet

Run a lightweight quality benchmark:

python3 scripts/check_clone_quality_bench.py \
  https://developer.mozilla.org/en-US/ \
  --output-root ./.tmp/clone-quality-bench \
  --wait-seconds 1 \
  --timeout-seconds 35 \
  --breakpoints mobile tablet

The benchmark prints compact rows for root, visual, and breakpoint scores. The full artifacts are written under the output directory.

CLI Commands

node ./bin/web-embedding.mjs capabilities
node ./bin/web-embedding.mjs install
node ./bin/web-embedding.mjs doctor
node ./bin/web-embedding.mjs uninstall
node ./bin/web-embedding.mjs paths
node ./bin/web-embedding.mjs telemetry status

node ./bin/web-embedding.mjs inspect --url https://www.mozilla.org/

node ./bin/web-embedding.mjs capture \
  --url https://www.mozilla.org/ \
  --output-dir ./.tmp/capture-mozilla \
  --breakpoints mobile tablet

node ./bin/web-embedding.mjs reproduce \
  --url https://www.mozilla.org/ \
  --output-dir ./.tmp/reproduce-mozilla \
  --breakpoints mobile tablet

node ./bin/web-embedding.mjs clone \
  --url https://www.mozilla.org/ \
  --output-dir ./.tmp/clone-mozilla \
  --breakpoints mobile tablet

node ./bin/web-embedding.mjs verify \
  --reference-bundle ./.tmp/reference/capture.json \
  --candidate-bundle ./.tmp/candidate/capture.json

Output Artifacts

A clone run can produce:

• capture.json
• pipeline-run-manifest.json
• dom/snapshot.json
• dom/runtime.html
• styles/computed-summary.json
• styles/css-analysis.json
• network/manifest.json
• network/har.json
• network/har-like.json
• network/replay-report.json
• assets/inventory.json
• interactions/states.json
• interactions/trace.json
• screenshots/runtime.png
• session/storage-state.json
• reproduction/plan.json
• reproduction/evidence-limitations.json
• reproduction/rebuild-prompt.txt
• reproduction/rebuild/starter.html
• reproduction/rebuild/starter.css
• reproduction/rebuild/starter.tsx
• reproduction/rebuild/next-app/
• reproduction/self-verify/summary.json
• reproduction/self-verify/renderers/*/verification.json
• reproduction/self-verify/renderers/*/visual-qa.json
• reproduction/self-verify/renderers/*/breakpoints/*-verification.json

Quality Benchmark

Run the default small benchmark:

npm run check:clone-bench:local

Run the universal route regression corpus and expectations gate:

npm run check:benchmark-routes:local

Run a lightweight clone score gate:

npm run check:clone-score-gate:local

Validate the committed benchmark evidence manifest:

npm run check:benchmark-evidence:local

Validate production pipeline gates:

npm run check:production-readiness:local

Run the operational smokes individually:

npm run check:job-queue:local
npm run check:har-replay:local
npm run check:authenticated-corpus:local

Classify failure/action codes from a route report:

npm run classify:pipeline-failures -- --report ./.tmp/universal-route-benchmark/universal-route-report.json

Find low-scoring persisted benchmark artifacts:

npm run summarize:benchmark-scores -- --root ./.tmp --min-score 60 --max-score 70

Run specific URLs:

python3 scripts/check_clone_quality_bench.py \
  https://www.example.com \
  https://www.mozilla.org/ \
  --no-breakpoints

Run a responsive benchmark:

python3 scripts/check_clone_quality_bench.py \
  https://developer.mozilla.org/en-US/ \
  --breakpoints mobile tablet

Development Checks

python3 -m py_compile \
  bundle/source-first-clone/mcp/source_first_clone/*.py \
  scripts/check_integration_smoke.py \
  scripts/check_clone_quality_bench.py

npm run check:integration:local

git diff --check

Repo Layout

• bundle/source-first-clone Installed plugin bundle, MCP server, and exact-clone intake skill.
• bundle/source-first-clone/mcp/source_first_clone Capture, planning, rebuild, repair, and verification engine.
• bin/web-embedding.mjs Node CLI wrapper.
• python/web_embedding/installer.py Shared installer and command dispatcher.
• scripts/check_clone_quality_bench.py URL clone quality benchmark helper.
• scripts/benchmark_routes.py Universal route/capture-depth regression benchmark helper.
• scripts/check_benchmark_report.py Benchmark expectation validator for exact, minimum, and contains-style checks.
• scripts/check_benchmark_evidence.py Benchmark evidence manifest validator.
• scripts/check_job_queue_smoke.py Filesystem async clone job queue smoke test.
• scripts/check_har_replay_smoke.py Deterministic HAR replay engine smoke test.
• scripts/benchmark_authenticated_corpus.py User-provided authenticated dashboard corpus runner.
• scripts/summarize_benchmark_scores.py Utility for finding low or high scoring persisted benchmark artifacts under an output root.
• scripts/classify_pipeline_failures.py Operational failure/action taxonomy summarizer for reports and capture artifacts.
• scripts/check_production_readiness.py Production readiness gate validator for corpus, failure taxonomy, CI wiring, and policy docs.
• scripts/check_integration_smoke.py Release, install, and URL-only clone smoke test.
• scripts/release_bundle.py Release artifact builder.
• docs/ Architecture notes and universal benchmark documentation.

Positioning

The strongest claim for this project is:

A source-first website cloning engine that combines Playwright capture, HAR replay, MCP tools, and self-verification to rebuild iframe-blocked public pages with reproducible visual, DOM, style, interaction, and responsive scores.

Avoid treating the output as a legal or ownership bypass. The engine can reconstruct public page structure, but permission, licensing, and acceptable use still matter.

License

MIT