Phase 0: Credential Preflight (REQUIRED — run BEFORE anything else)

Before running any of the steps below, always invoke the shared preflight check:

~/.claude/skills/seo/scripts/preflight.sh

If exit code is 0: credentials are configured — proceed with the rest of this skill silently.

If exit code is 2: the script prints the DataForSEO setup wizard to stdout. STOP, display that wizard to the user verbatim, and wait for them to paste credentials in this format:

login: their_email@example.com
password: their_api_password_here

When they reply:

1. Parse login: and password: from their message.
2. Write them to ~/.claude/skills/seo/.env:

   DATAFORSEO_LOGIN=<login>
   DATAFORSEO_PASSWORD=<password>
   

3. chmod 600 ~/.claude/skills/seo/.env
4. Run a verification call: ~/.claude/skills/seo/scripts/keyword_research.py volume "test"
5. If verification succeeds (real JSON returned): tell the user "✅ Credentials verified. Running your command now..." and proceed with the original request.
6. If status 40104 — Please verify your account: tell the user to verify their account at https://app.dataforseo.com/, then say "continue" to retry.
7. If any other auth error: ask them to double-check the API password (the long alphanumeric string from https://app.dataforseo.com/api-access — not their account login password).

Never echo credentials back to the user, never include them in tool output, and never commit them.

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SEO Domain Comparison Skill

Powered by: DataForSEO API — Labs domain_rank_overview + Backlinks summary + Labs domain_intersection (×2 for both domains). Cost: ~$0.05 per comparison.

Run (parallel)

~/.claude/skills/seo/scripts/domain_overview.py overview --target <d1>
~/.claude/skills/seo/scripts/domain_overview.py overview --target <d2>
~/.claude/skills/seo/scripts/backlinks.py summary --target <d1>
~/.claude/skills/seo/scripts/backlinks.py summary --target <d2>
~/.claude/skills/seo/scripts/domain_overview.py intersect --you <d1> --competitor <d2> --limit 100

Output: side-by-side table

                          | <d1>          | <d2>          | Winner
--------------------------|---------------|---------------|-------
Estimated organic traffic | 12,400/mo     | 8,900/mo      | <d1>
Total ranking keywords    | 3,420         | 5,180         | <d2>
Top-10 keywords           | 412           | 287           | <d1>
Backlinks                 | 14,200        | 8,900         | <d1>
Referring domains         | 612           | 891           | <d2>
Dofollow ratio            | 71%           | 58%           | <d1>
Domain rank               | 421           | 502           | <d2>

SERP overlap section

From the intersect call:

Shared keywords: <N>
- Where <d1> wins: <X> keywords
- Where <d2> wins: <Y> keywords
- Top 5 keywords where <d1> outranks <d2>: ...
- Top 5 keywords where <d2> outranks <d1>: ...

Verdict

3-4 sentence summary covering:

1. Which domain is stronger overall
2. Where the weaker one is winning anyway (their leverage points)
3. The single biggest gap the weaker domain should close
4. The single biggest threat to the stronger domain