Google Ads — Measurement (tracking gate)

Prove conversion tracking is correct and trustworthy, or block plan/builder-* until it is. Reuse the live MCP detection from setup. Never raise an alarm from the action list alone.

STEP 0 — Load context

If account-context.yaml is missing, run setup first — don't validate tracking on an unconfigured account. Read account-context.yaml: google_ads.customer_id, conversion_actions, measurement.*, data_source (for value sanity), business.model/vertical (lead vs purchase expectations). Output goes to the working directory; update the context's conversion_actions + measurement.* as you verify them.

Model dispatch (run cheap, decide expensive) — see ${CLAUDE_PLUGIN_ROOT}/references/model-tier-dispatch.md

• Scout (haiku) — STEP 0 context read; the conversion-action list pull.
• Routine (sonnet) — STEP 1 per-campaign conversion segmentation (segments.conversion_action_name), STEP 3 Ads/GA4/store value pulls. Dispatch as general-purpose sub-agents; return raw, don't conclude.
• Judge (main session) — the WHOLE-picture verdict, every is-it-a-problem call, the double-count judgment, the PASS/WARN/FAIL that gates plan/builder. Never let a cheap tier raise the alarm — that holistic judgment is the entire point of this skill.

STEP 1 — Build the WHOLE picture before concluding (mandatory)

A conversion list read in isolation lies. The same flag is fine or fatal depending on context. Do all four:

1. Actions — enabled conversion actions: name, category, primary_for_goal, counting_type, value_settings.default_value (value tracking on/off), source. (Omit conversion_action.type if the MCP rejects it; see ${CLAUDE_PLUGIN_ROOT}/skills/audit/references/gaql-notes.md.) Decode the enums: category 4=PURCHASE · 6=LEAD · 5=SIGNUP · 3=PAGE_VIEW · 8=ADD_TO_CART · 9=BEGIN_CHECKOUT · 11=PHONE_CALL_LEAD · 13=SUBMIT_LEAD_FORM · 16=GET_DIRECTIONS · 18=CONTACT · 19=ENGAGEMENT · 20=STORE_VISIT; counting_type 2=ONE (one per click) · 3=EVERY (many per click). For ecommerce, the working primary should be category=PURCHASE with EVERY counting + value tracking on.
2. Usage — which actions each ACTIVE campaign actually fires/optimizes for: segment conversions by segments.conversion_action_name per campaign over 30-90 days (explicit YYYY-MM-DD dates). An action no campaign fires is inert.
3. Source & double-count — map each value-carrying action to a source (store channel, e.g. Shopify Google&YouTube "App Purchase" / WooCommerce / GA4 import / gtag / Merchant Center). Two value purchases both PRIMARY and both firing = double count. One primary + one secondary = correct. See ${CLAUDE_PLUGIN_ROOT}/references/conversion-tracking-logic.md.
4. Verdict — only now, per the rules below.

What is / isn't a problem

• ✅ Campaigns optimize toward the real working purchase action → healthy, even if other purchase actions exist as secondary. A second purchase action kept secondary (e.g. GA4 web purchase alongside the channel App Purchase) is the CORRECT anti-double-count setup, not a bug.
• ✅ "Junk" actions (menu views, directions, calls, store visits, app micro-events) flagged primary but fired by NO active campaign → harmless. Note for awareness; do not alarm.
• ✅ Cross-brand action sitting secondary and unused → harmless; note it.
• 🔴 Two value-carrying purchase actions BOTH primary and BOTH firing in the same campaigns → real double-count. Flag.
• 🔴 The action campaigns optimize for is a low-value engagement action, not the purchase action → flag.
• 🔴 No working purchase/lead conversion at all, or value tracking off for ecommerce → flag.

STEP 2 — Other checks

• Counting type: one for leads (avoid form-spam inflation); every for ecommerce purchases.
• Value tracking: on for ecommerce; sane currency.
• Enhanced Conversions / Consent Mode v2 / server-side (CAPI): the API/MCP usually CANNOT confirm these — mark them verify-in-UI, not FAIL. State the ceiling if confirmed.
• Conversion lag: are conversions still trickling in (long lag windows)? Note if attribution looks cut.

STEP 3 — Value sanity cross-check

When more than one source is available, compare and report the gap (don't silently pick one):

• Google Ads attributed value/conversions for the primary purchase action (30-90d).
• GA4 purchase value for the same window (via GA4 MCP / API / a connected GA4 client).
• Store net sales (Online Store channel only — exclude draft/POS/TikTok/marketplace; see audit/references or aov-and-sales-sourcing.md). A large divergence (>35% Ads vs GA4) is itself a finding (attribution, tagging, or channel-mix issue).

Data sources & fallback (graceful, but NO fabrication)

Read the context connections block. GA4/store via MCP → API creds → a connected client/script. Missing GA4/store does NOT block measurement — you can still judge the Google-Ads-side setup. But report only the Ads number and mark the value cross-check UNVERIFIED — connect GA4/store; NEVER estimate the missing side to "complete" the comparison (a fabricated GA4/store figure is worse than an honest gap). If the source is merely unwired, prefer guiding the user to connect it over skipping.

Output — verdict + notes (to the working dir)

• Notes for awareness — the harmless-but-worth-knowing items (inert primaries, unused cross-brand actions). Frame as notes, never alarms.
• Verdict: PASS / WARN / FAIL with specific fixes. Only genuine 🔴 problems gate downstream. FAIL blocks plan and builder-*.
• Update account-context.yaml: refresh conversion_actions (with the verified primary + source) and measurement.* flags (enhanced_conversions, server_side, ga4.enabled).

To build / refine later

• A runnable helper to pull the per-campaign conversion segmentation + format the verdict.
• Reuse the shared HTML report module (see DECISIONS) when it exists.