Third-Party Detector Skill

Purpose

Identify third-party services integrated into the target's technology stack including payments, analytics, authentication, CRM, support, and other SaaS tools.

Input

Raw signals from Phase 2:

javascript_signals - Third-party script URLs, analytics globals
html_signals - Widget embeds, script tags
dns_signals - Service verification TXT records
http_signals - CSP allowed domains
job_signals - Tool mentions

Service Categories

Payment Processing

Service	Detection Signals	Weight
Stripe	js.stripe.com, Stripe.js, api.stripe.com in CSP	40
PayPal	paypal.com scripts, PayPal buttons	35
Square	squareup.com, Square SDK	35
Braintree	braintreegateway.com	35
Adyen	adyen.com scripts	35
Klarna	klarna.com scripts	30
Affirm	affirm.com scripts	30
Plaid	plaid.com scripts (banking)	35

Analytics & Tracking

Service	Detection Signals	Weight
Google Analytics	google-analytics.com, gtag, ga()	40
Google Tag Manager	googletagmanager.com, dataLayer	40
Segment	cdn.segment.com, analytics.js	40
Mixpanel	cdn.mxpnl.com, mixpanel global	40
Amplitude	cdn.amplitude.com	40
Heap	heap-analytics.com	35
Hotjar	static.hotjar.com, hj global	35
FullStory	fullstory.com, FS global	35
Pendo	pendo.io scripts	35
Posthog	posthog.com, ph global	35

Customer Support

Service	Detection Signals	Weight
Intercom	intercom.io, Intercom widget	40
Zendesk	zendesk.com, zd-chat	40
Freshdesk	freshdesk.com scripts	35
Drift	drift.com, Drift widget	35
HubSpot Chat	hubspot.com, hs-scripts	35
Crisp	crisp.chat	30
Tawk.to	tawk.to scripts	30
LiveChat	livechat.com	30

Authentication & Identity

Service	Detection Signals	Weight
Auth0	auth0.com, Auth0 SDK	40
Okta	okta.com scripts	40
Firebase Auth	firebase.google.com/auth	40
Clerk	clerk.dev scripts	35
AWS Cognito	cognito-idp patterns	35
Azure AD	login.microsoftonline.com	35

CRM & Marketing

Service	Detection Signals	Weight
Salesforce	salesforce.com patterns	40
HubSpot	hubspot.com, hs-scripts	40
Marketo	marketo.com, munchkin	35
Mailchimp	mailchimp.com scripts	35
SendGrid	sendgrid.net TXT records	35
Intercom	intercom.io (CRM features)	35
Pipedrive	pipedrive.com	30
Pardot	pardot.com	35

Error & Performance Monitoring

Service	Detection Signals	Weight
Sentry	sentry.io, Sentry SDK	40
Datadog RUM	datadoghq.com RUM	40
New Relic	newrelic.com, NREUM	35
Bugsnag	bugsnag.com	35
LogRocket	logrocket.com	35
Rollbar	rollbar.com	35

A/B Testing & Experimentation

Service	Detection Signals	Weight
Optimizely	optimizely.com	40
LaunchDarkly	launchdarkly.com	40
VWO	vwo.com scripts	35
Google Optimize	optimize.google.com	35
Split.io	split.io	35
Statsig	statsig.com	35

CDN & Media

Service	Detection Signals	Weight
Cloudinary	cloudinary.com	35
imgix	imgix.net	35
Vimeo	vimeo.com, player.vimeo.com	30
YouTube	youtube.com embeds	30
Wistia	wistia.com	30

Social & Communication

Service	Detection Signals	Weight
Slack	slack.com integrations	30
Discord	discord.com widgets	30
Twitter/X	twitter.com widgets, platform.twitter.com	30
Facebook	facebook.com SDK, connect.facebook.net	35
LinkedIn	linkedin.com tracking	30

Detection Logic

def detect_third_party_services(signals):
    results = []

    # JavaScript/Script Tag Detection
    for script_url in signals.javascript_signals.script_urls:
        for service in THIRD_PARTY_SERVICES:
            for pattern in service.script_patterns:
                if pattern in script_url:
                    add_service(results, service.name, service.category, {
                        "type": "script_url",
                        "value": script_url,
                        "weight": service.weight
                    })

    # JavaScript Global Detection
    for global_var in signals.javascript_signals.globals:
        for service in THIRD_PARTY_SERVICES:
            if service.global_var and service.global_var in global_var:
                add_service(results, service.name, service.category, {
                    "type": "js_global",
                    "value": global_var,
                    "weight": service.weight
                })

    # CSP Domain Detection
    if signals.http_signals.csp:
        csp_domains = extract_domains(signals.http_signals.csp)
        for domain in csp_domains:
            for service in THIRD_PARTY_SERVICES:
                if any(pattern in domain for pattern in service.domain_patterns):
                    add_service(results, service.name, service.category, {
                        "type": "csp_domain",
                        "value": domain,
                        "weight": service.weight - 10  # Slightly lower weight
                    })

    # DNS TXT Record Detection
    for txt in signals.dns_signals.txt_records:
        for service in THIRD_PARTY_SERVICES:
            if service.txt_pattern and service.txt_pattern in txt:
                add_service(results, service.name, service.category, {
                    "type": "dns_txt",
                    "value": txt,
                    "weight": service.weight
                })

    # Job Posting Detection
    if signals.job_signals:
        for tech_mention in signals.job_signals.tech_mentions:
            for service in THIRD_PARTY_SERVICES:
                if service.name.lower() in tech_mention.technology.lower():
                    add_service(results, service.name, service.category, {
                        "type": "job_posting",
                        "value": f"Mentioned in job postings",
                        "weight": 20  # Lower weight for job signals
                    })

    return results

Output

{
  "skill": "third_party_detector",
  "results": {
    "technologies": [
      {
        "name": "Stripe",
        "category": "Payment Processing",
        "signals": [
          {
            "type": "script_url",
            "value": "https://js.stripe.com/v3/",
            "weight": 40
          },
          {
            "type": "csp_domain",
            "value": "api.stripe.com in CSP",
            "weight": 30
          }
        ],
        "total_weight": 70,
        "integration_type": "Client-side SDK"
      },
      {
        "name": "Google Analytics 4",
        "category": "Analytics",
        "signals": [
          {
            "type": "script_url",
            "value": "https://www.googletagmanager.com/gtag/js",
            "weight": 40
          },
          {
            "type": "js_global",
            "value": "gtag() function detected",
            "weight": 35
          }
        ],
        "total_weight": 75,
        "tracking_id": "G-XXXXXXXXXX"
      },
      {
        "name": "Intercom",
        "category": "Customer Support",
        "signals": [
          {
            "type": "script_url",
            "value": "https://widget.intercom.io/widget/",
            "weight": 40
          }
        ],
        "total_weight": 40,
        "integration_type": "Chat Widget"
      },
      {
        "name": "Sentry",
        "category": "Error Monitoring",
        "signals": [
          {
            "type": "script_url",
            "value": "https://browser.sentry-cdn.com/",
            "weight": 40
          }
        ],
        "total_weight": 40,
        "integration_type": "Client-side SDK"
      },
      {
        "name": "Auth0",
        "category": "Authentication",
        "signals": [
          {
            "type": "csp_domain",
            "value": "*.auth0.com in CSP",
            "weight": 35
          },
          {
            "type": "job_posting",
            "value": "Auth0 mentioned in job requirements",
            "weight": 20
          }
        ],
        "total_weight": 55
      }
    ],
    "services_by_category": {
      "Payment Processing": ["Stripe"],
      "Analytics": ["Google Analytics 4", "Google Tag Manager"],
      "Customer Support": ["Intercom"],
      "Error Monitoring": ["Sentry"],
      "Authentication": ["Auth0"]
    },
    "integration_summary": {
      "total_services": 5,
      "categories_covered": 5,
      "client_side_integrations": 4,
      "server_side_likely": ["Auth0", "Stripe"]
    }
  }
}

Confidence Notes

Third-party detection confidence varies by signal type:

Signal Type	Confidence	Notes
Script URL	High (90%)	Direct integration
JS Global	High (85%)	Library loaded
CSP Domain	Medium (75%)	May be unused
DNS TXT	High (90%)	Official verification
Job Posting	Low (60%)	May be planned/legacy

Error Handling

Missing scripts: May indicate server-side only integration
Multiple analytics: Common - report all
Deprecated services: Note if detected

third-party-detector