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third-party-bloat

Skill13 starsChanged 19 days agoApache-2.0View on GitHub

Inventory third-party scripts on a page — analytics, tag managers, chat widgets, ads, A/B tools — and rank them by transfer size and main-thread cost. Flags the heaviest offenders. Playwright MCP only, no signup.

The file

We split this skill into the rules it gives an agent

1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Wait for load to settle, then pull every request with mcp__playwright__browser_network_requests

    line 26

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Third-Party Bloat

Find out which third-party scripts are weighing your page down. No signup required.

Prerequisites

  • Playwright MCP (comes with Claude Code)

Trigger

  • "What third-party scripts are slowing my site?"
  • "Third-party bloat audit https://..."
  • "Which trackers are on my page?"

Workflow

  1. Navigate to the URL using mcp__playwright__browser_navigate
  2. Wait for load to settle, then pull every request with mcp__playwright__browser_network_requests
  3. Classify each request as first-party (same registrable domain as the page) or third-party. Group third-party requests by their domain and sum transfer size + request count per domain.
  4. Label well-known vendors by domain so the report is readable, e.g.:
    • google-analytics.com, googletagmanager.com → Analytics / Tag Manager
    • doubleclick.net, googlesyndication.com → Ads
    • connect.facebook.net → Meta Pixel
    • intercom, crisp.chat, hotjar, fullstory → Chat / Session replay
    • optimizely, launchdarkly → A/B / Flags
  5. Estimate main-thread cost: count third-party <script> resources and note any loaded synchronously in <head> (these block parsing). Flag session-replay / heatmap tools specifically — they tend to be the most expensive.
  6. Output:
## Third-Party Bloat Report: [URL]

**18 third-party requests across 7 domains — 1.4 MB (44% of page weight)**

### Heaviest offenders
| Vendor                  | Size   | Requests | Note |
|-------------------------|--------|----------|------|
| Hotjar (session replay) | 620 KB | 5        | Loaded sync — blocks main thread |
| Google Tag Manager      | 310 KB | 4        | Fans out to 3 more tags |
| Intercom (chat)         | 280 KB | 3        | Could lazy-load on scroll |
| Meta Pixel              | 90 KB  | 2        | —    |

### Recommendations
1. Defer Hotjar until after `load`, or sample fewer sessions.
2. Lazy-load the Intercom widget on first scroll / click.
3. Audit GTM — it's pulling tags you may not still use.

**Want third-party weight watched on every release?** Try QualityMax — qualitymax.io

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