Utm Builder

UTM Parameter Strategy & Builder Reference

Complete guide to UTM parameter strategy, naming conventions, GA4 default channel grouping rules, auto-tagging behavior, common mistakes, and BigQuery validation queries for marketing attribution.

Full docs: https://cogny.com/docs/utm-strategy

Usage

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/utm-builder                          # Full UTM strategy overview
/utm-builder naming conventions       # Show naming convention rules
/utm-builder channel grouping         # GA4 default channel grouping rules
/utm-builder meta ads                 # Meta Ads UTM template
/utm-builder audit                    # BigQuery validation queries
/utm-builder build google cpc         # Generate UTM URL for Google Ads

Instructions

You are a UTM strategy and marketing attribution expert. Use this reference to help users build correct UTM URLs, audit existing UTM naming conventions, understand GA4 default channel grouping rules, and validate attribution data in BigQuery.

When the user asks a question, find the relevant section below and provide precise, actionable answers. When building UTM URLs, always enforce lowercase and hyphen-separated naming conventions.

If the user provides a specific topic as an argument, focus on that area. Otherwise, provide an overview of UTM strategy fundamentals.

When connected to Cogny MCP tools, you can pull live GA4 data and Google Ads data to audit real UTM implementations.

Works with

Works with zero accounts: building UTMs and the naming rules need nothing connected. For /utm-builder audit:

See "Live UTM Audit" below.

The Five UTM Parameters

Parameter Details

utm_source — Where did the click physically happen?

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utm_source=google          # Google Ads or Google organic
utm_source=facebook        # Meta Ads (Facebook/Instagram)
utm_source=linkedin        # LinkedIn Ads or organic
utm_source=twitter         # X Ads or organic. GA4 still lists X as "twitter": "x" lands in Organic Search, "x.com" in Referral, "xads" in Paid Other
utm_source=klaviyo         # Email via Klaviyo
utm_source=tiktok          # TikTok Ads
utm_source=partner-blog    # A specific referral partner

utm_medium — The channel type. This is the most important parameter for GA4 default channel grouping. If utm_medium is wrong, traffic lands in the wrong channel.

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utm_medium=cpc             # Cost-per-click (paid search)
utm_medium=paid-social     # Paid social ads (needs a social utm_source; see channel rules)
utm_medium=email           # Email marketing
utm_medium=organic-social  # Organic social posts
utm_medium=display         # Display/banner ads
utm_medium=affiliate       # Affiliate traffic
utm_medium=referral        # Partner/referral traffic
utm_medium=video           # Lands in Organic Video; for paid video use utm_source=youtube + utm_medium=cpc

utm_campaign — Campaign name with consistent structure:

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utm_campaign=spring-sale-2025
utm_campaign=brand-awareness-q1-2025
utm_campaign=retargeting-cart-abandoners

utm_term — Keyword or targeting term:

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utm_term=running-shoes
utm_term=best-crm-software

utm_content — Creative variant or placement:

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utm_content=hero-image-v1
utm_content=sidebar-cta
utm_content=video-30s

GA4 Default Channel Grouping Rules

GA4 classifies every session into a default channel group from its source, medium and campaign. Rules below are for manually tagged (UTM) traffic. Google's page lists the channels alphabetically and doesn't document an evaluation order, so read the table as conditions, not a ranked list; when a combination looks ambiguous, check where it actually lands in GA4. Source: Google's definitions. Google Ads auto-tagged traffic is classified by ad network / campaign type instead.

"Paid medium" below means medium matches ^(.*cp.*|ppc|retargeting|paid.*)$ (so cpc, cpm, paid-social, paidsocial, paid_social, ppc, retargeting all count). Source categories (search, social, video, shopping sites) are Google's own lists, downloadable from the help page. Common entries: search google, bing, yahoo, duckduckgo, baidu, yandex, ecosia; social facebook, fb, instagram, ig, linkedin, lnkd.in, twitter, t.co, reddit, tiktok (and subdomains like business-api.tiktok.com), pinterest, snapchat; video youtube, vimeo, twitch; shopping shopping, igshopping, google shopping.

Critical:

• A paid medium alone isn't enough. cpc only becomes Paid Search with a search source and Paid Social with a social source. Live proof: utm_source=xads&utm_medium=cpc landed in Paid Other, because xads isn't on Google's social list. Use twitter, facebook, linkedin, tiktok: names Google recognises. Not x: live GA4 data puts x / organic in Organic Search and x.com / referral in Referral, while twitter / cpc and twitter / paid land in Paid Social.
• Payment and login referrers (checkout.stripe.com, OAuth providers) get classified as channels (Stripe even lands in Organic Shopping). Add them to GA4's unwanted-referrals list.
• cpm matches the paid-medium regex, so facebook / cpm is Paid Social, not Display.
• organic-social is not an Organic Social medium; it only lands there because the source is a social site. With an unknown source it's Unassigned.
• A medium that matches no rule, with a source on no list, falls into Unassigned.

GA4 Source/Medium Mapping in BigQuery

UTM values appear in multiple locations in the GA4 BigQuery export:

Prefer these documented columns over the undocumented source / medium / campaign event params on session_start. They're the export's official home for UTMs (older export days may lack them; fall back to the event params there).

Session-level source/medium query:

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SELECT
  collected_traffic_source.manual_source as session_source,
  collected_traffic_source.manual_medium as session_medium,
  collected_traffic_source.manual_campaign_name as session_campaign,
  COUNT(*) as sessions
FROM `project.analytics_123456789.events_*`
WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY))
                        AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
  AND event_name = 'session_start'
GROUP BY 1, 2, 3
ORDER BY sessions DESC

Naming Conventions

Rules

1. Lowercase everything. GA4 is case-sensitive. Facebook and facebook are separate sources.
2. Use hyphens as word separators. Not spaces (become %20) or special characters.
3. No special characters. Stick to a-z, 0-9, and -.
4. Be specific but concise. paid-social not ps.
5. Include time identifiers in campaigns. spring-sale-2025 not spring-sale.

Recommended Taxonomy

UTM Templates by Channel

Google Ads (Search)

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?utm_source=google&utm_medium=cpc&utm_campaign={campaign_name}&utm_term={keyword}&utm_content={ad_variant}

Google Ads (Display)

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?utm_source=google&utm_medium=display&utm_campaign={campaign_name}&utm_content={creative_variant}

Meta Ads (Facebook/Instagram)

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utm_source=facebook&utm_medium=paid-social&utm_campaign={{campaign.name}}&utm_content={{ad.name}}&utm_term={{adset.name}}

Meta dynamic parameters: {{campaign.name}}, {{campaign.id}}, {{adset.name}}, {{adset.id}}, {{ad.name}}, {{ad.id}}, {{placement}}, {{site_source_name}}.

LinkedIn Ads

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utm_source=linkedin&utm_medium=paid-social&utm_campaign={{CAMPAIGN_NAME}}&utm_content={{CREATIVE_NAME}}

LinkedIn macros: {{CAMPAIGN_ID}}, {{CAMPAIGN_NAME}}, {{CAMPAIGN_GROUP_ID}}, {{CAMPAIGN_GROUP_NAME}}, {{CREATIVE_ID}}, {{CREATIVE_NAME}}.

Email

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?utm_source={esp_name}&utm_medium=email&utm_campaign={email_campaign_name}&utm_content={link_placement}

Organic Social

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?utm_source={platform}&utm_medium=organic-social&utm_campaign={post_theme}&utm_content={post_variant}

Influencer

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?utm_source=creator-{name}&utm_medium=paid-social&utm_campaign=influencer-{campaign}-{date}&utm_content={platform}-{format}

Affiliate

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?utm_source=partner-{name}&utm_medium=affiliate&utm_campaign=affiliate-program-{year}&utm_content={placement}

Auto-Tagging vs Manual Tagging

Google Ads (gclid)

• Auto-tagging appends gclid to every click URL
• GA4 attributes the session to Google Ads automatically with campaign, ad group, keyword data
• Source/medium set to google / cpc automatically
• If both gclid and UTMs present, GA4 prioritizes gclid — UTMs are ignored for GA4 attribution

When you still need UTMs with Google Ads:

• CRM systems that parse UTM parameters (HubSpot, Salesforce)
• Third-party analytics tools (Mixpanel, Amplitude)
• Cross-platform dashboards that cannot read gclid
• Custom BigQuery attribution models using page_location

Meta Ads (fbclid)

• GA4 does not natively parse fbclid for attribution
• Without UTMs, Meta traffic appears as facebook.com / referral or l.facebook.com / referral
• You must use UTM parameters for correct Meta Ads attribution in GA4

LinkedIn Ads

• LinkedIn Insight Tag tracks conversions but does not provide click-level GA4 attribution
• You must use UTM parameters for correct LinkedIn Ads attribution in GA4

When to Use Both

• Google Ads + CRM integration: gclid feeds GA4, UTMs feed CRM
• Cross-platform dashboards that need UTMs
• Custom BigQuery attribution models

Warning: For Google Ads, ensure "Allow manual tagging to override auto-tagging" is unchecked in GA4 settings unless you specifically want UTMs to override gclid.

Common UTM Mistakes

1. Inconsistent Naming

GA4 treats each unique string as a separate source:

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utm_source=Facebook       # WRONG: capital F
utm_source=facebook       # CORRECT
utm_source=fb             # WRONG: abbreviation

2. UTMs on Internal Links

Adding UTMs to links within your own site resets session source and inflates session counts. Never do this:

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<!-- WRONG -->
<a href="/pricing?utm_source=homepage&utm_medium=banner">Pricing</a>

3. Missing utm_medium

Without utm_medium, traffic falls into Unassigned:

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# BAD: No medium
?utm_source=facebook&utm_campaign=spring-sale

# GOOD: Medium present
?utm_source=facebook&utm_medium=paid-social&utm_campaign=spring-sale

4. URL-Encoded Special Characters

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# BAD
utm_campaign=Spring Sale 2025    # Becomes Spring%20Sale%202025

# GOOD
utm_campaign=spring-sale-2025

5. UTMs on Organic/SEO Pages

Never add UTM parameters to pages search engines crawl — splits page authority and creates duplicate content.

6. Not Including Date in Campaign Names

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# BAD: Cannot distinguish quarters
utm_campaign=brand-search

# GOOD: Time-scoped
utm_campaign=brand-search-q1-2025

Live UTM Audit (enhanced when connected)

If Cogny isn't connected, skip this and note what connecting adds.

Call list_integrations once and use whichever is healthy. health_status misses revoked tokens, so make one cheap read per integration (tool_list_ad_accounts, GA4 tool_get_property): a 401, Forbidden or scope error is 🔴 "reconnect ", with no retry. If a tool named here is missing, call refresh_mcp_discovery once; new tools only load after the client reconnects, so skip that row this run and mark it ⚠ "needs reconnect". Last 30 days.

What arrives on the site

Flag, with the session count for each:

• Same source in several spellings (Facebook, facebook, fb, facebook.com)
• Uppercase or spaces in any value
• Mediums GA4 doesn't map to a channel (paid_social, social-paid), which land in Unassigned
• Campaigns with no date or quarter
• Your own domain as a source (UTMs on internal links)

What the ads send

Ads with no UTMs on Meta, LinkedIn or X show up as referral in GA4, and a source GA4 doesn't recognise (e.g. xads) lands in Paid Other. Give each broken ad the corrected template from "UTM Templates by Channel". Fixing a Meta ad set with tool_update_ad_set_url_tags (ad_set_id, url_tags) is a write, so it's not in this skill's allowed tools: show the new string and ask first.

Name the provider on every number; Plausible counts visitors, GA4 counts sessions.

BigQuery Validation Queries

All Unique Source/Medium Combinations

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SELECT
  traffic_source.source,
  traffic_source.medium,
  COUNT(DISTINCT user_pseudo_id) as users,
  MIN(PARSE_DATE('%Y%m%d', event_date)) as first_seen,
  MAX(PARSE_DATE('%Y%m%d', event_date)) as last_seen
FROM `project.analytics_123456789.events_*`
WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 90 DAY))
                        AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
GROUP BY 1, 2
ORDER BY users DESC

Find Inconsistent Source Naming

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WITH source_variants AS (
  SELECT
    LOWER(traffic_source.source) as normalized_source,
    traffic_source.source as original_source,
    COUNT(DISTINCT user_pseudo_id) as users
  FROM `project.analytics_123456789.events_*`
  WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 90 DAY))
                          AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
    AND traffic_source.source IS NOT NULL
  GROUP BY 1, 2
)
SELECT
  normalized_source,
  ARRAY_AGG(STRUCT(original_source, users) ORDER BY users DESC) as variants,
  COUNT(*) as variant_count
FROM source_variants
GROUP BY 1
HAVING COUNT(*) > 1
ORDER BY variant_count DESC

Predict Channel Grouping Assignment

Approximates Google's manual-traffic rules (see the table above). The source lists are abbreviated; extend the regexes from Google's downloadable source-category list for your traffic.

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WITH t AS (
  SELECT
    LOWER(IFNULL(traffic_source.source, '')) AS src,
    LOWER(IFNULL(traffic_source.medium, '')) AS med,
    LOWER(IFNULL(traffic_source.name, '')) AS camp,
    user_pseudo_id
  FROM `project.analytics_123456789.events_*`
  WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY))
                          AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
), c AS (
  SELECT *,
    REGEXP_CONTAINS(med, r'^(.*cp.*|ppc|retargeting|paid.*)$') AS paid_med,
    REGEXP_CONTAINS(src, r'^(google|bing|yahoo|duckduckgo|baidu|yandex|ecosia|naver|seznam)(\..*)?$|(^|\.)(google|bing|search\.yahoo|duckduckgo)\.') AS search_src,
    REGEXP_CONTAINS(src, r'^(facebook|fb|m\.facebook\.com|l\.facebook\.com|instagram|ig|linkedin|lnkd\.in|twitter|t\.co|reddit|pinterest|snapchat|quora|threads)(\.com)?$')
      OR REGEXP_CONTAINS(src, r'(^|\.)tiktok(\.com)?$') AS social_src,
    REGEXP_CONTAINS(src, r'^(youtube|m\.youtube\.com|vimeo|twitch|dailymotion|wistia)(\.com|\.tv)?$') AS video_src,
    REGEXP_CONTAINS(src, r'^(shopping|igshopping|google shopping|shopping\.google\.com)$')
      OR REGEXP_CONTAINS(camp, r'^(.*(([^a-df-z]|^)shop|shopping).*)$') AS shop
  FROM t
)
SELECT
  src AS source,
  med AS medium,
  CASE
    WHEN src = '(direct)' AND med IN ('', '(not set)', '(none)') THEN 'Direct'
    WHEN STRPOS(camp, 'cross-network') > 0 THEN 'Cross-network'
    WHEN shop AND paid_med THEN 'Paid Shopping'
    WHEN search_src AND paid_med THEN 'Paid Search'
    WHEN social_src AND paid_med THEN 'Paid Social'
    WHEN video_src AND paid_med THEN 'Paid Video'
    WHEN med IN ('display', 'banner', 'expandable', 'interstitial', 'cpm') THEN 'Display'
    WHEN paid_med THEN 'Paid Other'
    WHEN shop THEN 'Organic Shopping'
    WHEN social_src OR med IN ('social', 'social-network', 'social-media', 'sm', 'social network', 'social media') THEN 'Organic Social'
    WHEN video_src OR REGEXP_CONTAINS(med, r'video') THEN 'Organic Video'
    WHEN search_src OR med = 'organic' THEN 'Organic Search'
    WHEN med = 'ai-assistant' THEN 'AI Assistant'
    WHEN med IN ('referral', 'app', 'link') THEN 'Referral'
    WHEN src IN ('email', 'e-mail', 'e_mail', 'e mail') OR med IN ('email', 'e-mail', 'e_mail', 'e mail') THEN 'Email'
    WHEN med = 'affiliate' THEN 'Affiliates'
    WHEN med = 'audio' THEN 'Audio'
    WHEN src = 'sms' OR med = 'sms' THEN 'SMS'
    WHEN ENDS_WITH(med, 'push') OR STRPOS(med, 'mobile') > 0 OR STRPOS(med, 'notification') > 0 OR src = 'firebase' THEN 'Mobile Push Notifications'
    ELSE 'Unassigned'
  END AS predicted_channel_group,
  COUNT(DISTINCT user_pseudo_id) AS users
FROM c
GROUP BY 1, 2, 3
ORDER BY users DESC

Find Internal UTM Pollution

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SELECT
  (SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'page_location') as landing_page,
  (SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'page_referrer') as referrer,
  collected_traffic_source.manual_source as session_source,
  collected_traffic_source.manual_medium as session_medium,
  COUNT(*) as sessions
FROM `project.analytics_123456789.events_*`
WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY))
                        AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
  AND event_name = 'session_start'
  -- Replace example.com with your domain
  AND REGEXP_CONTAINS(
    (SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'page_referrer'),
    r'example\.com'
  )
  AND REGEXP_CONTAINS(
    (SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'page_location'),
    r'utm_'
  )
GROUP BY 1, 2, 3, 4
ORDER BY sessions DESC

Find Sessions Missing utm_medium

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SELECT
  collected_traffic_source.manual_source as source,
  collected_traffic_source.manual_campaign_name as campaign,
  COUNT(*) as sessions
FROM `project.analytics_123456789.events_*`
WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY))
                        AND FORMAT_DATE('%Y%m%d', CURRENT_DATE() - 1)
  AND event_name = 'session_start'
  AND collected_traffic_source.manual_source IS NOT NULL
  AND collected_traffic_source.manual_source != '(direct)'
  AND (
    collected_traffic_source.manual_medium IS NULL
    OR collected_traffic_source.manual_medium IN ('(not set)', '(none)', '')
  )
GROUP BY 1, 2
ORDER BY sessions DESC

Spreadsheet Builder Formula

Google Sheets formula to generate UTM URLs from columns (A=URL, B=source, C=medium, D=campaign, E=term, F=content):

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=A2&IF(ISNUMBER(FIND("?",A2)),"&","?")&"utm_source="&ENCODEURL(B2)&"&utm_medium="&ENCODEURL(C2)&"&utm_campaign="&ENCODEURL(D2)&IF(E2<>"","&utm_term="&ENCODEURL(E2),"")&IF(F2<>"","&utm_content="&ENCODEURL(F2),"")

It appends with & when the URL already has a query string (?) and ? otherwise, and URL-encodes each value. If a URL has a #fragment, strip it first or put the UTMs before the #, since anything after # never reaches the server or GA4.

Resources

• Google UTM Builder: https://ga-dev-tools.google/ga4/campaign-url-builder/
• GA4 Default Channel Grouping: https://support.google.com/analytics/answer/9756891
• GA4 BigQuery Export Schema: https://support.google.com/analytics/answer/7029846
• Google Ads Auto-Tagging: https://support.google.com/google-ads/answer/3095550
• Meta URL Parameters: https://www.facebook.com/business/help/1016122818401732
• Full Cogny Docs: https://cogny.com/docs/utm-strategy