구글 광고 문구를 작성하는 Claude 스킬

.claude/skills/google-ads/
  SKILL.md          ← Claude가 읽는 지침
  index.ts          ← 실제 도구 구현
  limits.ts         ← 글자 수 제한 검증

# Google Ads Manager Skill

Use this skill when the user says "check my Google Ads", "run ads
report", or "rewrite underperforming RSAs". Never run this without
explicit user instruction — it touches live ad spend.

## What it can do
- Pull campaign and ad group performance via GAQL (last 7 or 30 days)
- Flag responsive search ads with CTR < 3% or CPA above the stored
  target as underperformers
- Rewrite headlines (≤30 chars) and descriptions (≤90 chars) for
  flagged ads in Ale's voice
- Create new ad variations as PAUSED — never enabled automatically

## What it will NOT do
- Change budgets or bids without explicit confirmation
- Enable a paused ad
- Submit any headline or description that fails the character check

// .claude/skills/google-ads/index.ts
import { GoogleAdsApi } from "google-ads-api";
import Anthropic from "@anthropic-ai/sdk";

const client = new GoogleAdsApi({
  client_id: process.env.GOOGLE_ADS_CLIENT_ID!,
  client_secret: process.env.GOOGLE_ADS_CLIENT_SECRET!,
  developer_token: process.env.GOOGLE_ADS_DEVELOPER_TOKEN!,
});

const customer = client.Customer({
  customer_id: process.env.GOOGLE_ADS_CUSTOMER_ID!,
  login_customer_id: process.env.GOOGLE_ADS_LOGIN_CUSTOMER_ID,
  refresh_token: process.env.GOOGLE_ADS_REFRESH_TOKEN!,
});

interface AdPerformance {
  adGroupAdId: string;
  campaignName: string;
  headlines: string[];
  descriptions: string[];
  impressions: number;
  clicks: number;
  costMicros: number;
  conversions: number;
  ctr: number;
  cpa: number;
}

async function getAdPerformance(days = 7): Promise<AdPerformance[]> {
  const rows = await customer.query(`
    SELECT
      ad_group_ad.ad.id,
      campaign.name,
      ad_group_ad.ad.responsive_search_ad.headlines,
      ad_group_ad.ad.responsive_search_ad.descriptions,
      metrics.impressions,
      metrics.clicks,
      metrics.cost_micros,
      metrics.conversions
    FROM ad_group_ad
    WHERE segments.date DURING LAST_${days === 30 ? "30" : "7"}_DAYS
      AND ad_group_ad.status = 'ENABLED'
  `);

  return rows.map((r: any) => {
    const impressions = Number(r.metrics.impressions ?? 0);
    const clicks = Number(r.metrics.clicks ?? 0);
    const cost = Number(r.metrics.cost_micros ?? 0) / 1_000_000;
    const conversions = Number(r.metrics.conversions ?? 0);
    return {
      adGroupAdId: r.ad_group_ad.ad.id,
      campaignName: r.campaign.name,
      headlines: (r.ad_group_ad.ad.responsive_search_ad?.headlines ?? []).map((h: any) => h.text),
      descriptions: (r.ad_group_ad.ad.responsive_search_ad?.descriptions ?? []).map((d: any) => d.text),
      impressions,
      clicks,
      costMicros: Number(r.metrics.cost_micros ?? 0),
      conversions,
      ctr: impressions > 0 ? (clicks / impressions) * 100 : 0,
      cpa: conversions > 0 ? cost / conversions : Infinity,
    };
  });
}

const HEADLINE_MAX = 30;
const DESCRIPTION_MAX = 90;

function validateAsset(text: string, max: number): boolean {
  return text.length <= max;
}

async function rewriteRsa(
  ad: AdPerformance,
  targetCpa: number,
): Promise<{ headlines: string[]; descriptions: string[] }> {
  const anthropic = new Anthropic();
  const msg = await anthropic.messages.create({
    model: "claude-sonnet-4-6",
    max_tokens: 1024,
    messages: [{
      role: "user",
      content: `Rewrite this Google Ads responsive search ad in Alejandro Rioja's voice: direct, operator-focused, specific. It's underperforming — CTR ${ad.ctr.toFixed(2)}%, CPA $${ad.cpa.toFixed(2)} vs a $${targetCpa} target.

Current headlines: ${JSON.stringify(ad.headlines)}
Current descriptions: ${JSON.stringify(ad.descriptions)}

Rules, non-negotiable:
- Each headline: 30 characters MAXIMUM, including spaces and punctuation
- Each description: 90 characters MAXIMUM, including spaces and punctuation
- Return 5 headlines and 4 descriptions
- Return JSON only: {"headlines": ["...", ...], "descriptions": ["...", ...]}`,
    }],
  });
  const text = (msg.content[0] as any).text.replace(/```json\n?/, "").replace(/```/, "").trim();
  const parsed = JSON.parse(text);

  const headlines = parsed.headlines.filter((h: string) => validateAsset(h, HEADLINE_MAX));
  const descriptions = parsed.descriptions.filter((d: string) => validateAsset(d, DESCRIPTION_MAX));

  if (headlines.length < 3 || descriptions.length < 2) {
    throw new Error("Model returned too many over-limit assets — rerun or revise manually.");
  }

  return { headlines, descriptions };
}

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