audit-page-budget

/audit-page-budget

Single-backend skill. Calls audit_page_budget on the rolepod-uiproof MCP server. No fallback (D-024).

When to use

• Gating a UI change on a declared page-weight budget.
• Sanity-checking total page weight after adding an image, font, or third-party script.
• Establishing a baseline weight for a critical landing page.
• Running alongside /measure-cwv and /audit-a11y as a Verify-phase triple.

When NOT to use

• Build-time bundle inspection (webpack-bundle-analyzer style) — the parent rolepod's performance-engineer agent owns build-output concerns.
• Backend p95 / p99 latency — same.
• Synthetic load tests (k6, Locust) — same.
• Pages that fail to load (server 500, network error) — fix the page first.

Inputs

• url — URL to audit.
• viewport — optional { width, height }.
• budget — optional overrides. Defaults:
  • total_kb: 1500
  • js_kb: 300
  • css_kb: 100
  • image_kb: 500
  • font_kb: 100
  • third_party_kb: 200
  • request_count: 100
• third_party_hostnames[] — explicit allowlist. When supplied, an entry is only counted as third-party if its hostname matches one of these. When omitted, all non-page hostnames count as third-party (with an eTLD+1 heuristic for subdomains of the page).
• wait_for_idle_ms — wait for networkidle after load. Default 2000.

Outputs

• run_id — folder under the run root (see Evidence routing).
• totals_bytes — totals per category in bytes.
• request_count — total requests recorded.
• violations[] — each { category, actual_kb, budget_kb, over_pct }.
• status — pass (no violations) | warn (≤50% over) | fail (any category >50% over budget).
• report_path — path to budget.json.
• har_path — path to the HAR file (re-loadable in DevTools).

Process

1. Build audit_page_budget input from the user's intent (URL, optional budget overrides, optional third-party allowlist).
2. Call the tool.
3. Surface status + violations inline. Reference the HAR path for detailed network inspection.

Evidence routing

Run artifacts are saved under:

• Standalone: .rolepod-uiproof/artifacts/audit_page_budget_<ts>_<uuid>/
• With rolepod parent (detected via the marker file <git-root>/.rolepod/parent-active written by the parent's SessionStart hook): <git-root>/.rolepod/evidence/<ts>-rolepod-uiproof-audit-page-budget/

Either way the run directory contains budget.json, network.har, and a manifest.json per Extension Protocol v1 so the parent's check-work skill can aggregate the result into the verify report.

If the tool is unavailable

Surface plainly:

The /audit-page-budget skill needs the rolepod-uiproof MCP server, which is not currently available. Confirm the plugin is installed and try again.

Do not attempt another backend (D-024).

Examples

Default budget on a landing page

{
  "url": "https://example.com"
}

Strict JS budget for a critical route

{
  "url": "https://example.com/checkout",
  "budget": { "js_kb": 150, "total_kb": 800 }
}

Tag a specific third-party only

{
  "url": "https://example.com",
  "third_party_hostnames": ["googletagmanager.com", "doubleclick.net"]
}