From ded9da7d32c7b3dba379e0c21d2fcb702ca57298 Mon Sep 17 00:00:00 2001
From: Marc Mintel <marc@mintel.me>
Date: Mon, 2 Mar 2026 10:16:11 +0100
Subject: [PATCH] feat(seo-engine): implement competitor scraper, MDX draft
 editor, and strategy report generator

---
 packages/seo-engine/.gitignore                |   4 +
 packages/seo-engine/README.md                 | 123 +++++++++
 packages/seo-engine/package.json              |  37 +++
 packages/seo-engine/src/agents/scraper.ts     | 132 ++++++++++
 .../seo-engine/src/agents/serper-agent.ts     |  64 +++++
 .../src/agents/serper-autocomplete.ts         |  43 ++++
 .../src/agents/serper-competitors.ts          |  75 ++++++
 packages/seo-engine/src/editor.ts             | 148 +++++++++++
 packages/seo-engine/src/engine.ts             | 237 ++++++++++++++++++
 packages/seo-engine/src/index.ts              |  12 +
 packages/seo-engine/src/llm-client.ts         | 153 +++++++++++
 packages/seo-engine/src/prompts.ts            |  35 +++
 packages/seo-engine/src/report.ts             | 237 ++++++++++++++++++
 packages/seo-engine/src/steps/content-gap.ts  |  84 +++++++
 packages/seo-engine/src/test-run.ts           |  53 ++++
 packages/seo-engine/src/test-serper.ts        |  38 +++
 packages/seo-engine/src/types.ts              |  59 +++++
 packages/seo-engine/tsconfig.json             |  19 ++
 packages/seo-engine/tsup.config.ts            |   9 +
 pnpm-lock.yaml                                |  34 +++
 20 files changed, 1596 insertions(+)
 create mode 100644 packages/seo-engine/.gitignore
 create mode 100644 packages/seo-engine/README.md
 create mode 100644 packages/seo-engine/package.json
 create mode 100644 packages/seo-engine/src/agents/scraper.ts
 create mode 100644 packages/seo-engine/src/agents/serper-agent.ts
 create mode 100644 packages/seo-engine/src/agents/serper-autocomplete.ts
 create mode 100644 packages/seo-engine/src/agents/serper-competitors.ts
 create mode 100644 packages/seo-engine/src/editor.ts
 create mode 100644 packages/seo-engine/src/engine.ts
 create mode 100644 packages/seo-engine/src/index.ts
 create mode 100644 packages/seo-engine/src/llm-client.ts
 create mode 100644 packages/seo-engine/src/prompts.ts
 create mode 100644 packages/seo-engine/src/report.ts
 create mode 100644 packages/seo-engine/src/steps/content-gap.ts
 create mode 100644 packages/seo-engine/src/test-run.ts
 create mode 100644 packages/seo-engine/src/test-serper.ts
 create mode 100644 packages/seo-engine/src/types.ts
 create mode 100644 packages/seo-engine/tsconfig.json
 create mode 100644 packages/seo-engine/tsup.config.ts

diff --git a/packages/seo-engine/.gitignore b/packages/seo-engine/.gitignore
new file mode 100644
index 0000000..2348075
--- /dev/null
+++ b/packages/seo-engine/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+dist
+.seo-output
+.env
diff --git a/packages/seo-engine/README.md b/packages/seo-engine/README.md
new file mode 100644
index 0000000..b422275
--- /dev/null
+++ b/packages/seo-engine/README.md
@@ -0,0 +1,123 @@
+# @mintel/seo-engine
+
+AI-powered SEO keyword discovery, topic clustering, competitor analysis, and content gap identification — grounded in real search data, zero hallucinations.
+
+## Architecture
+
+```
+ProjectContext + SeoConfig
+        │
+        ▼
+┌──────────────────────────────────────────┐
+│            SEO Engine Orchestrator       │
+│                                          │
+│  1. Seed Query Expansion                 │
+│     (company + industry + seedKeywords)  │
+│                                          │
+│  2. Data Collection (parallel)           │
+│     ├── Serper Search Agent              │
+│     │   (related searches, PAA,          │
+│     │    organic snippets, volume proxy) │
+│     ├── Serper Autocomplete Agent        │
+│     │   (long-tail suggestions)          │
+│     └── Serper Competitor Agent          │
+│         (top-10 SERP positions)          │
+│                                          │
+│  3. LLM Evaluation (Gemini/Claude)       │
+│     → Strict context filtering           │
+│     → Topic Clustering + Intent Mapping  │
+│                                          │
+│  4. Content Gap Analysis (LLM)           │
+│     → Compare clusters vs existing pages │
+│     → Identify missing content           │
+└──────────────────────────────────────────┘
+        │
+        ▼
+   SeoEngineOutput
+   (clusters, gaps, competitors, discarded)
+```
+
+## Quick Start
+
+```typescript
+import { runSeoEngine } from "@mintel/seo-engine";
+
+const result = await runSeoEngine(
+  {
+    companyName: "KLZ Cables",
+    industry: "Mittelspannungskabel, Kabeltiefbau",
+    briefing: "B2B provider of specialized medium-voltage cables.",
+    targetAudience: "Bauleiter, Netzbetreiber",
+    competitors: ["nkt.de", "faberkabel.de"],
+    seedKeywords: ["NA2XS2Y", "VPE-isoliert"],
+    existingPages: [
+      { url: "/produkte", title: "Produkte" },
+      { url: "/kontakt", title: "Kontakt" },
+    ],
+    locale: { gl: "de", hl: "de" },
+  },
+  {
+    serperApiKey: process.env.SERPER_API_KEY!,
+    openRouterApiKey: process.env.OPENROUTER_API_KEY!,
+  },
+);
+```
+
+## Configuration
+
+### `ProjectContext`
+
+| Field              | Type                          | Description                                 |
+| ------------------ | ----------------------------- | ------------------------------------------- |
+| `companyName`      | `string?`                     | Client company name                         |
+| `industry`         | `string?`                     | Industry / main focus keywords              |
+| `briefing`         | `string?`                     | Project briefing text                       |
+| `targetAudience`   | `string?`                     | Who the content targets                     |
+| `competitors`      | `string[]?`                   | Competitor domains to analyze               |
+| `seedKeywords`     | `string[]?`                   | Explicit seed keywords beyond auto-derived  |
+| `existingPages`    | `{ url, title }[]?`           | Current site pages for content gap analysis |
+| `customGuidelines` | `string?`                     | Extra strict filtering rules for the LLM    |
+| `locale`           | `{ gl: string, hl: string }?` | Google locale (default: `de`)               |
+
+### `SeoConfig`
+
+| Field              | Type      | Description                                  |
+| ------------------ | --------- | -------------------------------------------- |
+| `serperApiKey`     | `string`  | **Required.** Serper API key                 |
+| `openRouterApiKey` | `string`  | **Required.** OpenRouter API key             |
+| `model`            | `string?` | LLM model (default: `google/gemini-2.5-pro`) |
+| `maxKeywords`      | `number?` | Cap total keywords returned                  |
+
+## Output
+
+```typescript
+interface SeoEngineOutput {
+  topicClusters: TopicCluster[]; // Grouped keywords with intent + scores
+  competitorRankings: CompetitorRanking[]; // Who ranks for your terms
+  contentGaps: ContentGap[]; // Missing pages you should create
+  discardedTerms: string[]; // Terms filtered out (with reasons)
+}
+```
+
+## Agents
+
+| Agent                 | Source                 | Data                                |
+| --------------------- | ---------------------- | ----------------------------------- |
+| `serper-agent`        | Serper `/search`       | Related searches, PAA, snippets     |
+| `serper-autocomplete` | Serper `/autocomplete` | Google Autocomplete long-tail terms |
+| `serper-competitors`  | Serper `/search`       | Competitor SERP positions           |
+
+## API Keys
+
+- **Serper** — [serper.dev](https://serper.dev) (pay-per-search, ~$0.001/query)
+- **OpenRouter** — [openrouter.ai](https://openrouter.ai) (pay-per-token)
+
+No monthly subscriptions. Pure pay-on-demand.
+
+## Development
+
+```bash
+pnpm install          # from monorepo root
+pnpm --filter @mintel/seo-engine build
+npx tsx src/test-run.ts   # smoke test (needs API keys in .env)
+```
diff --git a/packages/seo-engine/package.json b/packages/seo-engine/package.json
new file mode 100644
index 0000000..110e1cd
--- /dev/null
+++ b/packages/seo-engine/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "@mintel/seo-engine",
+  "version": "1.0.0",
+  "private": true,
+  "description": "AI-powered SEO keyword and topic cluster evaluation engine",
+  "type": "module",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsup",
+    "dev": "tsup --watch",
+    "test": "vitest",
+    "clean": "rm -rf dist",
+    "lint": "eslint src --ext .ts"
+  },
+  "dependencies": {
+    "axios": "^1.7.9",
+    "cheerio": "1.0.0-rc.12",
+    "dotenv": "^16.4.7"
+  },
+  "devDependencies": {
+    "@mintel/eslint-config": "workspace:*",
+    "@mintel/tsconfig": "workspace:*",
+    "@types/node": "^20.17.17",
+    "tsup": "^8.3.6",
+    "tsx": "^4.19.2",
+    "typescript": "^5.7.3",
+    "vitest": "^3.0.5"
+  }
+}
diff --git a/packages/seo-engine/src/agents/scraper.ts b/packages/seo-engine/src/agents/scraper.ts
new file mode 100644
index 0000000..f12c7ef
--- /dev/null
+++ b/packages/seo-engine/src/agents/scraper.ts
@@ -0,0 +1,132 @@
+import axios from "axios";
+import * as cheerio from "cheerio";
+import { llmJsonRequest } from "../llm-client.js";
+
+export interface ScrapedContext {
+  url: string;
+  wordCount: number;
+  text: string;
+  headings: { level: number; text: string }[];
+}
+
+export interface ReverseEngineeredBriefing {
+  recommendedWordCount: number;
+  coreTopicsToCover: string[];
+  suggestedHeadings: string[];
+  entitiesToInclude: string[];
+  contentFormat: string; // e.g. "Lange Liste mit Fakten", "Kaufberater", "Lexikon-Eintrag"
+}
+
+/**
+ * Fetches the HTML of a URL and extracts the main readable text and headings.
+ */
+export async function scrapeCompetitorUrl(
+  url: string,
+): Promise<ScrapedContext | null> {
+  try {
+    console.log(`[Scraper] Fetching source: ${url}`);
+    const response = await axios.get(url, {
+      headers: {
+        "User-Agent":
+          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
+      },
+      timeout: 10000,
+    });
+
+    const $ = cheerio.load(response.data);
+
+    // Remove junk elements before extracting text
+    $(
+      "script, style, nav, footer, header, aside, .cookie, .banner, iframe",
+    ).remove();
+
+    const headings: { level: number; text: string }[] = [];
+    $(":header").each((_, el) => {
+      const level = parseInt(el.tagName.replace(/h/i, ""), 10);
+      const text = $(el).text().trim().replace(/\s+/g, " ");
+      if (text) headings.push({ level, text });
+    });
+
+    // Extract body text, removing excessive whitespace
+    const text = $("body").text().replace(/\s+/g, " ").trim();
+    const wordCount = text.split(" ").length;
+
+    return {
+      url,
+      text: text.slice(0, 15000), // Cap length to prevent blowing up the LLM token limit
+      wordCount,
+      headings,
+    };
+  } catch (err) {
+    console.error(
+      `[Scraper] Failed to scrape ${url}: ${(err as Error).message}`,
+    );
+    return null;
+  }
+}
+
+const BRIEFING_SYSTEM_PROMPT = `
+You are a Senior Technical SEO Strategist.
+I will give you the scraped text and headings of a competitor's article that currently ranks #1 on Google for our target keyword.
+
+### OBJECTIVE:
+Reverse engineer the content. Tell me EXACTLY what topics, entities, and headings we must include
+in our own article to beat this competitor.
+Do not just copy their headings. Distill the *core intent* and *required knowledge depth*.
+
+### RULES:
+- If the text is very short (e.g., an e-commerce category page), mention that the format is "Category Page" and recommend a word count +50% higher than theirs.
+- Extract hyper-specific entities (e.g. DIN norms, specific materials, specific processes) that prove topic authority.
+- LANGUAGE: Match the language of the provided text.
+
+### OUTPUT FORMAT:
+{
+  "recommendedWordCount": number,
+  "coreTopicsToCover": ["string"],
+  "suggestedHeadings": ["string"],
+  "entitiesToInclude": ["string"],
+  "contentFormat": "string"
+}
+`;
+
+/**
+ * Analyzes the scraped context using an LLM to generate a blueprint to beat the competitor.
+ */
+export async function analyzeCompetitorContent(
+  context: ScrapedContext,
+  targetKeyword: string,
+  config: { openRouterApiKey: string; model?: string },
+): Promise<ReverseEngineeredBriefing | null> {
+  const userPrompt = `
+TARGET KEYWORD TO BEAT: "${targetKeyword}"
+COMPETITOR URL: ${context.url}
+COMPETITOR WORD COUNT: ${context.wordCount}
+
+COMPETITOR HEADINGS:
+${context.headings.map((h) => `H${h.level}: ${h.text}`).join("\n")}
+
+COMPETITOR TEXT (Truncated):
+${context.text}
+`;
+
+  try {
+    const { data } = await llmJsonRequest<ReverseEngineeredBriefing>({
+      model: config.model || "google/gemini-2.5-pro",
+      apiKey: config.openRouterApiKey,
+      systemPrompt: BRIEFING_SYSTEM_PROMPT,
+      userPrompt,
+    });
+
+    // Ensure numbers are numbers
+    data.recommendedWordCount =
+      Number(data.recommendedWordCount) || context.wordCount + 300;
+
+    return data;
+  } catch (err) {
+    console.error(
+      `[Scraper] NLP Analysis failed for ${context.url}:`,
+      (err as Error).message,
+    );
+    return null;
+  }
+}
diff --git a/packages/seo-engine/src/agents/serper-agent.ts b/packages/seo-engine/src/agents/serper-agent.ts
new file mode 100644
index 0000000..7357557
--- /dev/null
+++ b/packages/seo-engine/src/agents/serper-agent.ts
@@ -0,0 +1,64 @@
+import axios from "axios";
+
+export interface SerperResult {
+  relatedSearches: string[];
+  peopleAlsoAsk: string[];
+  organicSnippets: string[];
+  estimatedTotalResults: number;
+}
+
+/**
+ * Fetch Google search data via Serper's /search endpoint.
+ * Extracts related searches, People Also Ask, organic snippets,
+ * and totalResults as a search volume proxy.
+ */
+export async function fetchSerperData(
+  query: string,
+  apiKey: string,
+  locale: { gl: string; hl: string } = { gl: "de", hl: "de" },
+): Promise<SerperResult> {
+  try {
+    const response = await axios.post(
+      "https://google.serper.dev/search",
+      {
+        q: query,
+        gl: locale.gl,
+        hl: locale.hl,
+      },
+      {
+        headers: {
+          "X-API-KEY": apiKey,
+          "Content-Type": "application/json",
+        },
+      },
+    );
+
+    const data = response.data;
+
+    const relatedSearches =
+      data.relatedSearches?.map((r: any) => r.query) || [];
+    const peopleAlsoAsk = data.peopleAlsoAsk?.map((p: any) => p.question) || [];
+    const organicSnippets = data.organic?.map((o: any) => o.snippet) || [];
+    const estimatedTotalResults = data.searchInformation?.totalResults
+      ? parseInt(data.searchInformation.totalResults, 10)
+      : 0;
+
+    return {
+      relatedSearches,
+      peopleAlsoAsk,
+      organicSnippets,
+      estimatedTotalResults,
+    };
+  } catch (error) {
+    console.error(
+      `Serper API error for query "${query}":`,
+      (error as Error).message,
+    );
+    return {
+      relatedSearches: [],
+      peopleAlsoAsk: [],
+      organicSnippets: [],
+      estimatedTotalResults: 0,
+    };
+  }
+}
diff --git a/packages/seo-engine/src/agents/serper-autocomplete.ts b/packages/seo-engine/src/agents/serper-autocomplete.ts
new file mode 100644
index 0000000..fa10742
--- /dev/null
+++ b/packages/seo-engine/src/agents/serper-autocomplete.ts
@@ -0,0 +1,43 @@
+import axios from "axios";
+
+export interface AutocompleteResult {
+  suggestions: string[];
+}
+
+/**
+ * Fetch Google Autocomplete suggestions via Serper's /autocomplete endpoint.
+ * These represent real user typing behavior — extremely high-signal for long-tail keywords.
+ */
+export async function fetchAutocompleteSuggestions(
+  query: string,
+  apiKey: string,
+  locale: { gl: string; hl: string } = { gl: "de", hl: "de" },
+): Promise<AutocompleteResult> {
+  try {
+    const response = await axios.post(
+      "https://google.serper.dev/autocomplete",
+      {
+        q: query,
+        gl: locale.gl,
+        hl: locale.hl,
+      },
+      {
+        headers: {
+          "X-API-KEY": apiKey,
+          "Content-Type": "application/json",
+        },
+      },
+    );
+
+    const suggestions =
+      response.data.suggestions?.map((s: any) => s.value || s) || [];
+
+    return { suggestions };
+  } catch (error) {
+    console.error(
+      `Serper Autocomplete error for query "${query}":`,
+      (error as Error).message,
+    );
+    return { suggestions: [] };
+  }
+}
diff --git a/packages/seo-engine/src/agents/serper-competitors.ts b/packages/seo-engine/src/agents/serper-competitors.ts
new file mode 100644
index 0000000..1c6b6e4
--- /dev/null
+++ b/packages/seo-engine/src/agents/serper-competitors.ts
@@ -0,0 +1,75 @@
+import axios from "axios";
+
+export interface CompetitorRanking {
+  keyword: string;
+  domain: string;
+  position: number;
+  title: string;
+  snippet: string;
+  link: string;
+}
+
+/**
+ * For a given keyword, check which competitor domains appear in the top organic results.
+ * Filters results to only include domains in the `competitorDomains` list.
+ */
+export async function fetchCompetitorRankings(
+  keyword: string,
+  competitorDomains: string[],
+  apiKey: string,
+  locale: { gl: string; hl: string } = { gl: "de", hl: "de" },
+): Promise<CompetitorRanking[]> {
+  if (competitorDomains.length === 0) return [];
+
+  try {
+    const response = await axios.post(
+      "https://google.serper.dev/search",
+      {
+        q: keyword,
+        gl: locale.gl,
+        hl: locale.hl,
+        num: 20,
+      },
+      {
+        headers: {
+          "X-API-KEY": apiKey,
+          "Content-Type": "application/json",
+        },
+      },
+    );
+
+    const organic: any[] = response.data.organic || [];
+
+    // Normalize competitor domains for matching
+    const normalizedCompetitors = competitorDomains.map((d) =>
+      d
+        .replace(/^(https?:\/\/)?(www\.)?/, "")
+        .replace(/\/$/, "")
+        .toLowerCase(),
+    );
+
+    return organic
+      .filter((result: any) => {
+        const resultDomain = new URL(result.link).hostname
+          .replace(/^www\./, "")
+          .toLowerCase();
+        return normalizedCompetitors.some(
+          (cd) => resultDomain === cd || resultDomain.endsWith(`.${cd}`),
+        );
+      })
+      .map((result: any) => ({
+        keyword,
+        domain: new URL(result.link).hostname.replace(/^www\./, ""),
+        position: result.position,
+        title: result.title || "",
+        snippet: result.snippet || "",
+        link: result.link,
+      }));
+  } catch (error) {
+    console.error(
+      `Serper Competitor check error for keyword "${keyword}":`,
+      (error as Error).message,
+    );
+    return [];
+  }
+}
diff --git a/packages/seo-engine/src/editor.ts b/packages/seo-engine/src/editor.ts
new file mode 100644
index 0000000..cb17344
--- /dev/null
+++ b/packages/seo-engine/src/editor.ts
@@ -0,0 +1,148 @@
+import * as fs from "node:fs/promises";
+import * as path from "node:path";
+import type { ContentGap } from "./types.js";
+import type { ReverseEngineeredBriefing } from "./agents/scraper.js";
+
+export interface FileEditorConfig {
+  outputDir: string;
+  authorName?: string;
+}
+
+/**
+ * Generates an SEO-friendly URL slug from a title.
+ */
+function createSlug(title: string): string {
+  return title
+    .toLowerCase()
+    .replace(/ä/g, "ae")
+    .replace(/ö/g, "oe")
+    .replace(/ü/g, "ue")
+    .replace(/ß/g, "ss")
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "");
+}
+
+/**
+ * Automatically creates local .mdx draft files for identified high-priority content gaps.
+ * Each file is self-explanatory: it tells the writer exactly WHY this page needs to exist,
+ * WHAT to write, and HOW to structure the content — all based on real competitor data.
+ */
+export async function createGapDrafts(
+  gaps: ContentGap[],
+  briefings: Map<string, ReverseEngineeredBriefing>,
+  config: FileEditorConfig,
+): Promise<string[]> {
+  const createdFiles: string[] = [];
+
+  try {
+    await fs.mkdir(path.resolve(process.cwd(), config.outputDir), {
+      recursive: true,
+    });
+  } catch (e) {
+    console.error(
+      `[File Editor] Could not create directory ${config.outputDir}:`,
+      e,
+    );
+    return [];
+  }
+
+  const dateStr = new Date().toISOString().split("T")[0];
+
+  for (const gap of gaps) {
+    if (gap.priority === "low") continue;
+
+    const slug = createSlug(gap.recommendedTitle);
+    const filePath = path.join(
+      path.resolve(process.cwd(), config.outputDir),
+      `${slug}.mdx`,
+    );
+    const briefing = briefings.get(gap.targetKeyword);
+
+    const priorityEmoji = gap.priority === "high" ? "🔴" : "🟡";
+
+    let body = "";
+
+    // ── Intro: Explain WHY this file exists ──
+    body += `{/* ═══════════════════════════════════════════════════════════════════\n`;
+    body += `   📋 SEO CONTENT BRIEFING — Auto-generated by @mintel/seo-engine\n`;
+    body += `   ═══════════════════════════════════════════════════════════════════\n\n`;
+    body += `   Dieses Dokument wurde automatisch erstellt.\n`;
+    body += `   Es basiert auf einer Analyse der aktuellen Google-Suchergebnisse\n`;
+    body += `   und der Webseiten deiner Konkurrenz.\n\n`;
+    body += `   ▸ Du kannst dieses File direkt als MDX-Seite verwenden.\n`;
+    body += `   ▸ Ersetze den Briefing-Block unten durch deinen eigenen Text.\n`;
+    body += `   ▸ Setze isDraft auf false, wenn der Text fertig ist.\n`;
+    body += `   ═══════════════════════════════════════════════════════════════════ */}\n\n`;
+
+    // ── Section 1: Warum diese Seite? ──
+    body += `## ${priorityEmoji} Warum diese Seite erstellt werden sollte\n\n`;
+    body += `**Priorität:** ${gap.priority === "high" ? "Hoch — Direkt umsatzrelevant" : "Mittel — Stärkt die thematische Autorität"}\n\n`;
+    body += `${gap.rationale}\n\n`;
+    body += `| Feld | Wert |\n`;
+    body += `|------|------|\n`;
+    body += `| **Focus Keyword** | \`${gap.targetKeyword}\` |\n`;
+    body += `| **Topic Cluster** | ${gap.relatedCluster} |\n`;
+    body += `| **Priorität** | ${gap.priority} |\n\n`;
+
+    // ── Section 2: Competitor Briefing ──
+    if (briefing) {
+      body += `## 🔍 Konkurrenz-Analyse (Reverse Engineered)\n\n`;
+      body += `> Die folgenden Daten stammen aus einer automatischen Analyse der Webseite,\n`;
+      body += `> die aktuell auf **Platz 1 bei Google** für das Keyword \`${gap.targetKeyword}\` rankt.\n`;
+      body += `> Nutze diese Informationen, um **besseren Content** zu schreiben.\n\n`;
+
+      body += `### Content-Format des Konkurrenten\n\n`;
+      body += `**${briefing.contentFormat}** — Empfohlene Mindestlänge: **~${briefing.recommendedWordCount} Wörter**\n\n`;
+
+      body += `### Diese Themen MUSS dein Artikel abdecken\n\n`;
+      body += `Die folgenden Punkte werden vom aktuellen Platz-1-Ranker behandelt. Wenn dein Artikel diese Themen nicht abdeckt, wird es schwer, ihn zu überholen:\n\n`;
+      briefing.coreTopicsToCover.forEach(
+        (t, i) => (body += `${i + 1}. ${t}\n`),
+      );
+
+      body += `\n### Fachbegriffe & Entitäten die im Text vorkommen müssen\n\n`;
+      body += `Diese Begriffe signalisieren Google, dass dein Text fachlich tiefgreifend ist. Versuche, möglichst viele davon natürlich in deinen Text einzubauen:\n\n`;
+      briefing.entitiesToInclude.forEach((e) => (body += `- \`${e}\`\n`));
+
+      body += `\n### Empfohlene Gliederung\n\n`;
+      body += `Orientiere dich an dieser Struktur (du kannst sie anpassen):\n\n`;
+      briefing.suggestedHeadings.forEach(
+        (h, i) => (body += `${i + 1}. **${h}**\n`),
+      );
+    } else {
+      body += `## 🔍 Konkurrenz-Analyse\n\n`;
+      body += `> Für dieses Keyword konnte kein Konkurrent gescraped werden.\n`;
+      body += `> Schreibe den Artikel trotzdem — du hast weniger Wettbewerb!\n`;
+    }
+
+    body += `\n---\n\n`;
+    body += `## ✍️ Dein Content (hier schreiben)\n\n`;
+    body += `{/* Lösche alles oberhalb dieser Zeile, wenn dein Text fertig ist. */}\n\n`;
+    body += `Hier beginnt dein eigentlicher Artikel...\n`;
+
+    const file = `---
+title: "${gap.recommendedTitle}"
+description: "TODO: Meta-Description mit dem Keyword '${gap.targetKeyword}' schreiben."
+date: "${dateStr}"
+author: "${config.authorName || "Mintel SEO Engine"}"
+tags: ["${gap.relatedCluster}"]
+isDraft: true
+focus_keyword: "${gap.targetKeyword}"
+---
+
+${body}`;
+
+    try {
+      await fs.writeFile(filePath, file, "utf8");
+      console.log(`[File Editor] Created draft: ${filePath}`);
+      createdFiles.push(filePath);
+    } catch (err) {
+      console.error(
+        `[File Editor] Failed to write ${filePath}:`,
+        (err as Error).message,
+      );
+    }
+  }
+
+  return createdFiles;
+}
diff --git a/packages/seo-engine/src/engine.ts b/packages/seo-engine/src/engine.ts
new file mode 100644
index 0000000..8f4e5e1
--- /dev/null
+++ b/packages/seo-engine/src/engine.ts
@@ -0,0 +1,237 @@
+import { llmJsonRequest } from "./llm-client.js";
+import { fetchSerperData } from "./agents/serper-agent.js";
+import { fetchAutocompleteSuggestions } from "./agents/serper-autocomplete.js";
+import {
+  fetchCompetitorRankings,
+  type CompetitorRanking,
+} from "./agents/serper-competitors.js";
+import {
+  scrapeCompetitorUrl,
+  analyzeCompetitorContent,
+  type ReverseEngineeredBriefing,
+} from "./agents/scraper.js";
+import { analyzeContentGaps, type ContentGap } from "./steps/content-gap.js";
+import { SEO_SYSTEM_PROMPT } from "./prompts.js";
+import type {
+  ProjectContext,
+  SeoConfig,
+  SeoEngineOutput,
+  TopicCluster,
+} from "./types.js";
+
+const DEFAULT_MODEL = "google/gemini-2.5-pro";
+
+export async function runSeoEngine(
+  context: ProjectContext,
+  config: SeoConfig,
+): Promise<SeoEngineOutput> {
+  if (!config.serperApiKey)
+    throw new Error("Missing Serper API Key in SeoConfig.");
+  if (!config.openRouterApiKey)
+    throw new Error("Missing OpenRouter API Key in SeoConfig.");
+
+  const locale = context.locale || { gl: "de", hl: "de" };
+  const seedQueries: string[] = [];
+
+  // Derive seed queries from context
+  if (context.companyName) seedQueries.push(context.companyName);
+  if (context.industry) seedQueries.push(context.industry);
+  if (context.competitors && context.competitors.length > 0) {
+    seedQueries.push(...context.competitors.slice(0, 2));
+  }
+  if (context.seedKeywords && context.seedKeywords.length > 0) {
+    seedQueries.push(...context.seedKeywords);
+  }
+
+  if (seedQueries.length === 0) {
+    throw new Error(
+      "ProjectContext must provide at least an industry, company name, or seedKeywords.",
+    );
+  }
+
+  console.log(
+    `[SEO Engine] Sourcing raw data for ${seedQueries.length} seeds: ${seedQueries.join(", ")}`,
+  );
+
+  // ──────────────────────────────────────────────
+  // Step 1: Google Search Data + Autocomplete (parallel per seed)
+  // ──────────────────────────────────────────────
+  const rawSearchData = new Set<string>();
+  const allAutocompleteSuggestions = new Set<string>();
+  const volumeMap = new Map<string, number>(); // keyword → totalResults
+
+  const searchPromises = seedQueries.map(async (query) => {
+    const [searchResult, autocompleteResult] = await Promise.all([
+      fetchSerperData(query, config.serperApiKey!, locale),
+      fetchAutocompleteSuggestions(query, config.serperApiKey!, locale),
+    ]);
+
+    searchResult.relatedSearches.forEach((r) => rawSearchData.add(r));
+    searchResult.peopleAlsoAsk.forEach((p) => rawSearchData.add(p));
+    searchResult.organicSnippets.forEach((o) => rawSearchData.add(o));
+    autocompleteResult.suggestions.forEach((s) => {
+      rawSearchData.add(s);
+      allAutocompleteSuggestions.add(s);
+    });
+
+    if (searchResult.estimatedTotalResults > 0) {
+      volumeMap.set(query, searchResult.estimatedTotalResults);
+    }
+  });
+
+  await Promise.all(searchPromises);
+  const rawTerms = Array.from(rawSearchData);
+
+  console.log(
+    `[SEO Engine] Sourced ${rawTerms.length} raw terms (incl. ${allAutocompleteSuggestions.size} autocomplete). Evaluating with LLM...`,
+  );
+
+  // ──────────────────────────────────────────────
+  // Step 2: LLM Evaluation + Topic Clustering
+  // ──────────────────────────────────────────────
+  const userPrompt = `
+PROJECT CONTEXT:
+CompanyName: ${context.companyName || "N/A"}
+Industry / Main Focus: ${context.industry || "N/A"}
+Briefing Summary: ${context.briefing || "N/A"}
+Target Audience: ${context.targetAudience || "N/A"}
+Known Competitors: ${context.competitors?.join(", ") || "N/A"}
+
+EXTRA STRICT GUIDELINES:
+${context.customGuidelines || "None. Apply standard Mintel strict adherence."}
+
+RAW SEARCH TERMS SOURCED FROM GOOGLE (incl. autocomplete, PAA, related, snippets):
+${rawTerms.map((t, i) => `${i + 1}. ${t}`).join("\n")}
+
+EVALUATE AND CLUSTER STRICTLY ACCORDING TO SYSTEM INSTRUCTIONS.
+`;
+
+  const { data: clusterData } = await llmJsonRequest<{
+    topicClusters: TopicCluster[];
+    discardedTerms: string[];
+  }>({
+    model: config.model || DEFAULT_MODEL,
+    apiKey: config.openRouterApiKey,
+    systemPrompt: SEO_SYSTEM_PROMPT,
+    userPrompt,
+  });
+
+  const topicClusters = clusterData.topicClusters || [];
+  const discardedTerms = clusterData.discardedTerms || [];
+
+  // Attach volume estimates based on totalResults proxy
+  for (const cluster of topicClusters) {
+    for (const kw of cluster.secondaryKeywords) {
+      const vol = volumeMap.get(kw.term);
+      if (vol !== undefined) {
+        kw.estimatedVolume =
+          vol > 1_000_000 ? "high" : vol > 100_000 ? "medium" : "low";
+      }
+    }
+  }
+
+  console.log(
+    `[SEO Engine] LLM clustered ${topicClusters.reduce((a, c) => a + c.secondaryKeywords.length + 1, 0)} keywords into ${topicClusters.length} clusters. Discarded ${discardedTerms.length}.`,
+  );
+
+  // ──────────────────────────────────────────────
+  // Step 3 & 4: Competitor SERP Analysis & Content Scraping
+  // ──────────────────────────────────────────────
+  let competitorRankings: CompetitorRanking[] = [];
+  const competitorBriefings: Record<string, ReverseEngineeredBriefing> = {};
+
+  if (context.competitors && context.competitors.length > 0) {
+    const primaryKeywords = topicClusters
+      .map((c) => c.primaryKeyword)
+      .slice(0, 5);
+    console.log(
+      `[SEO Engine] Checking competitor rankings for: ${primaryKeywords.join(", ")}`,
+    );
+
+    const competitorPromises = primaryKeywords.map((kw) =>
+      fetchCompetitorRankings(
+        kw,
+        context.competitors!,
+        config.serperApiKey!,
+        locale,
+      ),
+    );
+    const results = await Promise.all(competitorPromises);
+    competitorRankings = results.flat();
+
+    console.log(
+      `[SEO Engine] Found ${competitorRankings.length} competitor rankings.`,
+    );
+
+    // Pick top ranking competitor for each primary keyword to reverse engineer
+    console.log(`[SEO Engine] Reverse engineering top competitor content...`);
+    const scrapePromises = primaryKeywords.map(async (kw) => {
+      const topRanking = competitorRankings.find((r) => r.keyword === kw);
+      if (!topRanking) return null;
+
+      const scraped = await scrapeCompetitorUrl(topRanking.link);
+      if (!scraped) return null;
+
+      const briefing = await analyzeCompetitorContent(scraped, kw, {
+        openRouterApiKey: config.openRouterApiKey!,
+        model: config.model,
+      });
+
+      if (briefing) {
+        competitorBriefings[kw] = briefing;
+      }
+    });
+
+    await Promise.all(scrapePromises);
+    console.log(
+      `[SEO Engine] Generated ${Object.keys(competitorBriefings).length} competitor briefings.`,
+    );
+  }
+
+  // ──────────────────────────────────────────────
+  // Step 5: Content Gap Analysis
+  // ──────────────────────────────────────────────
+  let contentGaps: ContentGap[] = [];
+
+  if (context.existingPages && context.existingPages.length > 0) {
+    console.log(
+      `[SEO Engine] Analyzing content gaps against ${context.existingPages.length} existing pages...`,
+    );
+    contentGaps = await analyzeContentGaps(
+      topicClusters,
+      context.existingPages,
+      {
+        openRouterApiKey: config.openRouterApiKey,
+        model: config.model,
+      },
+    );
+    console.log(`[SEO Engine] Found ${contentGaps.length} content gaps.`);
+  }
+
+  // ──────────────────────────────────────────────
+  // Optional Keyword Cap
+  // ──────────────────────────────────────────────
+  if (config.maxKeywords) {
+    let count = 0;
+    for (const cluster of topicClusters) {
+      cluster.secondaryKeywords = cluster.secondaryKeywords.filter(() => {
+        if (count < config.maxKeywords!) {
+          count++;
+          return true;
+        }
+        return false;
+      });
+    }
+  }
+
+  console.log(`[SEO Engine] ✅ Complete.`);
+
+  return {
+    topicClusters,
+    competitorRankings,
+    competitorBriefings,
+    contentGaps,
+    autocompleteSuggestions: Array.from(allAutocompleteSuggestions),
+    discardedTerms,
+  };
+}
diff --git a/packages/seo-engine/src/index.ts b/packages/seo-engine/src/index.ts
new file mode 100644
index 0000000..9f2c0eb
--- /dev/null
+++ b/packages/seo-engine/src/index.ts
@@ -0,0 +1,12 @@
+export * from "./types.js";
+export * from "./engine.js";
+export * from "./editor.js";
+export { generateSeoReport } from "./report.js";
+export { fetchSerperData } from "./agents/serper-agent.js";
+export { fetchAutocompleteSuggestions } from "./agents/serper-autocomplete.js";
+export { fetchCompetitorRankings } from "./agents/serper-competitors.js";
+export {
+  scrapeCompetitorUrl,
+  analyzeCompetitorContent,
+} from "./agents/scraper.js";
+export { analyzeContentGaps } from "./steps/content-gap.js";
diff --git a/packages/seo-engine/src/llm-client.ts b/packages/seo-engine/src/llm-client.ts
new file mode 100644
index 0000000..75641e5
--- /dev/null
+++ b/packages/seo-engine/src/llm-client.ts
@@ -0,0 +1,153 @@
+// ============================================================================
+// LLM Client — Unified interface with model routing via OpenRouter
+// ============================================================================
+
+import axios from "axios";
+
+export interface LLMRequestOptions {
+  model: string;
+  systemPrompt: string;
+  userPrompt: string;
+  jsonMode?: boolean;
+  apiKey: string;
+}
+
+export interface LLMResponse {
+  content: string;
+  usage: {
+    promptTokens: number;
+    completionTokens: number;
+    cost: number;
+  };
+}
+
+/**
+ * Clean raw LLM output to parseable JSON.
+ * Handles markdown fences, control chars, trailing commas.
+ */
+export function cleanJson(str: string): string {
+  let cleaned = str.replace(/```json\n?|```/g, "").trim();
+  // eslint-disable-next-line no-control-regex
+  cleaned = cleaned.replace(/[\x00-\x1f\x7f-\x9f]/gi, " ");
+
+  cleaned = cleaned.replace(/,\s*([\]}])/g, "$1");
+  return cleaned;
+}
+
+/**
+ * Send a request to an LLM via OpenRouter.
+ */
+export async function llmRequest(
+  options: LLMRequestOptions,
+): Promise<LLMResponse> {
+  const { model, systemPrompt, userPrompt, jsonMode = true, apiKey } = options;
+
+  const resp = await axios
+    .post(
+      "https://openrouter.ai/api/v1/chat/completions",
+      {
+        model,
+        messages: [
+          { role: "system", content: systemPrompt },
+          { role: "user", content: userPrompt },
+        ],
+        ...(jsonMode ? { response_format: { type: "json_object" } } : {}),
+      },
+      {
+        headers: {
+          Authorization: `Bearer ${apiKey}`,
+          "Content-Type": "application/json",
+        },
+        timeout: 120000,
+      },
+    )
+    .catch((err) => {
+      if (err.response) {
+        console.error(
+          "OpenRouter API Error:",
+          JSON.stringify(err.response.data, null, 2),
+        );
+      }
+      throw err;
+    });
+
+  const content = resp.data.choices?.[0]?.message?.content;
+  if (!content) {
+    throw new Error(`LLM returned no content. Model: ${model}`);
+  }
+
+  let cost = 0;
+  const usage = resp.data.usage || {};
+  if (usage.cost !== undefined) {
+    cost = usage.cost;
+  } else {
+    // Fallback estimation
+    cost =
+      (usage.prompt_tokens || 0) * (0.1 / 1_000_000) +
+      (usage.completion_tokens || 0) * (0.4 / 1_000_000);
+  }
+
+  return {
+    content,
+    usage: {
+      promptTokens: usage.prompt_tokens || 0,
+      completionTokens: usage.completion_tokens || 0,
+      cost,
+    },
+  };
+}
+
+/**
+ * Send a request and parse the response as JSON.
+ */
+export async function llmJsonRequest<T = any>(
+  options: LLMRequestOptions,
+): Promise<{ data: T; usage: LLMResponse["usage"] }> {
+  let response;
+  try {
+    response = await llmRequest({ ...options, jsonMode: true });
+  } catch (err) {
+    console.warn(
+      "Retrying LLM request without forced JSON mode...",
+      (err as Error).message,
+    );
+    response = await llmRequest({ ...options, jsonMode: false });
+  }
+
+  const cleaned = cleanJson(response.content);
+
+  let parsed: T;
+  try {
+    parsed = JSON.parse(cleaned);
+  } catch (e) {
+    throw new Error(
+      `Failed to parse LLM JSON response: ${(e as Error).message}\nRaw: ${cleaned.substring(0, 500)}`,
+    );
+  }
+
+  // Unwrap common LLM artifacts: {"0": {...}}, {"state": {...}}, etc.
+  const unwrapped = unwrapResponse(parsed);
+
+  return { data: unwrapped as T, usage: response.usage };
+}
+
+/**
+ * Recursively unwrap common LLM wrapping patterns.
+ */
+function unwrapResponse(obj: any): any {
+  if (!obj || typeof obj !== "object" || Array.isArray(obj)) return obj;
+  const keys = Object.keys(obj);
+  if (keys.length === 1) {
+    const key = keys[0];
+    if (
+      key === "0" ||
+      key === "state" ||
+      key === "facts" ||
+      key === "result" ||
+      key === "data"
+    ) {
+      return unwrapResponse(obj[key]);
+    }
+  }
+  return obj;
+}
diff --git a/packages/seo-engine/src/prompts.ts b/packages/seo-engine/src/prompts.ts
new file mode 100644
index 0000000..0f11410
--- /dev/null
+++ b/packages/seo-engine/src/prompts.ts
@@ -0,0 +1,35 @@
+export const SEO_SYSTEM_PROMPT = `
+You are a high-end Digital Architect and Expert SEO Analyst for the Mintel ecosystem.
+Your exact job is to process RAW SEARCH DATA from Google (via Serper API) and evaluate it against our STRICT PROJECT CONTEXT.
+
+### OBJECTIVE:
+Given a project briefing, industry, and raw search queries (related searches, user questions), you must evaluate each term.
+Filter out ANY hallucinations, generic irrelevant fluff, or terms that do not strictly match the client's high-end context.
+Then, group the surviving relevant terms into logical "Topic Clusters" with search intents.
+
+### RULES:
+- NO Hallucinations. Do not invent keywords that were not provided in the raw data or strongly implied by the context.
+- ABOSLUTE STRICTNESS: If a raw search term is irrelevant to the provided industry/briefing, DISCARD IT. Add it to the "discardedTerms" list.
+- HIGH-END QUALITY: The Mintel standard requires precision. Exclude generic garbage like "was ist ein unternehmen" if the client does B2B HDD-Bohrverfahren.
+
+### OUTPUT FORMAT:
+You MUST respond with valid JSON matching this schema:
+{
+  "topicClusters": [
+    {
+      "clusterName": "string",
+      "primaryKeyword": "string",
+      "secondaryKeywords": [
+        {
+          "term": "string",
+          "intent": "informational" | "navigational" | "commercial" | "transactional",
+          "relevanceScore": number, // 1-10
+          "rationale": "string" // Short explanation why this fits the context
+        }
+      ],
+      "userIntent": "string" // Broad intent for the cluster
+    }
+  ],
+  "discardedTerms": ["string"] // Words you threw out and why
+}
+`;
diff --git a/packages/seo-engine/src/report.ts b/packages/seo-engine/src/report.ts
new file mode 100644
index 0000000..6fdfa87
--- /dev/null
+++ b/packages/seo-engine/src/report.ts
@@ -0,0 +1,237 @@
+import * as fs from "node:fs/promises";
+import * as path from "node:path";
+import type {
+  SeoEngineOutput,
+  TopicCluster,
+  ContentGap,
+  CompetitorRanking,
+} from "./types.js";
+import type { ReverseEngineeredBriefing } from "./agents/scraper.js";
+
+export interface ReportConfig {
+  projectName: string;
+  outputDir: string;
+  filename?: string;
+}
+
+/**
+ * Generates a comprehensive, human-readable SEO Strategy Report in Markdown.
+ * This is the "big picture" document that summarizes everything the SEO Engine found
+ * and gives the team a clear action plan.
+ */
+export async function generateSeoReport(
+  output: SeoEngineOutput,
+  config: ReportConfig,
+): Promise<string> {
+  const dateStr = new Date().toLocaleDateString("de-DE", {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  });
+
+  const allKeywords = output.topicClusters.flatMap((c) => [
+    c.primaryKeyword,
+    ...c.secondaryKeywords.map((k) => k.term),
+  ]);
+
+  let md = "";
+
+  // ══════════════════════════════════════════════
+  // Header
+  // ══════════════════════════════════════════════
+  md += `# 📊 SEO Strategie-Report: ${config.projectName}\n\n`;
+  md += `> Erstellt am **${dateStr}** von der **@mintel/seo-engine**\n\n`;
+
+  md += `## Zusammenfassung auf einen Blick\n\n`;
+  md += `| Metrik | Wert |\n`;
+  md += `|--------|------|\n`;
+  md += `| Keywords gefunden | **${allKeywords.length}** |\n`;
+  md += `| Topic Clusters | **${output.topicClusters.length}** |\n`;
+  md += `| Konkurrenz-Rankings analysiert | **${output.competitorRankings.length}** |\n`;
+  md += `| Konkurrenz-Briefings erstellt | **${Object.keys(output.competitorBriefings).length}** |\n`;
+  md += `| Content Gaps identifiziert | **${output.contentGaps.length}** |\n`;
+  md += `| Autocomplete-Vorschläge | **${output.autocompleteSuggestions.length}** |\n`;
+  md += `| Verworfene Begriffe | **${output.discardedTerms.length}** |\n\n`;
+
+  // ══════════════════════════════════════════════
+  // Section 1: Keywords zum Tracken
+  // ══════════════════════════════════════════════
+  md += `---\n\n`;
+  md += `## 🎯 Keywords zum Tracken\n\n`;
+  md += `Diese Keywords sind relevant für das Projekt und sollten in einem Ranking-Tracker (z.B. Serpbear) beobachtet werden:\n\n`;
+  md += `| # | Keyword | Intent | Relevanz | Cluster |\n`;
+  md += `|---|---------|--------|----------|--------|\n`;
+
+  let kwIndex = 1;
+  for (const cluster of output.topicClusters) {
+    md += `| ${kwIndex++} | **${cluster.primaryKeyword}** | — | 🏆 Primary | ${cluster.clusterName} |\n`;
+    for (const kw of cluster.secondaryKeywords) {
+      const intentEmoji =
+        kw.intent === "transactional"
+          ? "💰"
+          : kw.intent === "commercial"
+            ? "🛒"
+            : kw.intent === "navigational"
+              ? "🧭"
+              : "📖";
+      md += `| ${kwIndex++} | ${kw.term} | ${intentEmoji} ${kw.intent} | ${kw.relevanceScore}/10 | ${cluster.clusterName} |\n`;
+    }
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 2: Topic Clusters
+  // ══════════════════════════════════════════════
+  md += `\n---\n\n`;
+  md += `## 🗂️ Topic Clusters\n\n`;
+  md += `Die SEO Engine hat die Keywords automatisch in thematische Cluster gruppiert. Jeder Cluster sollte idealerweise durch eine **Pillar Page** und mehrere **Sub-Pages** abgedeckt werden.\n\n`;
+
+  for (const cluster of output.topicClusters) {
+    md += `### ${cluster.clusterName}\n\n`;
+    md += `- **Pillar Keyword:** \`${cluster.primaryKeyword}\`\n`;
+    md += `- **User Intent:** ${cluster.userIntent}\n`;
+    md += `- **Sub-Keywords:** ${cluster.secondaryKeywords.map((k) => `\`${k.term}\``).join(", ")}\n\n`;
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 3: Konkurrenz-Landscape
+  // ══════════════════════════════════════════════
+  if (output.competitorRankings.length > 0) {
+    md += `---\n\n`;
+    md += `## 🏁 Konkurrenz-Landscape\n\n`;
+    md += `Für die wichtigsten Keywords wurde geprüft, welche Konkurrenten aktuell bei Google ranken:\n\n`;
+    md += `| Keyword | Konkurrent | Position | Titel |\n`;
+    md += `|---------|-----------|----------|-------|\n`;
+
+    for (const r of output.competitorRankings) {
+      md += `| ${r.keyword} | **${r.domain}** | #${r.position} | ${r.title.slice(0, 60)}${r.title.length > 60 ? "…" : ""} |\n`;
+    }
+    md += `\n`;
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 4: Competitor Briefings
+  // ══════════════════════════════════════════════
+  if (Object.keys(output.competitorBriefings).length > 0) {
+    md += `---\n\n`;
+    md += `## 🔬 Konkurrenz-Briefings (Reverse Engineered)\n\n`;
+    md += `Für die folgenden Keywords wurde der aktuelle **Platz-1-Ranker** automatisch gescraped und analysiert. Diese Briefings zeigen exakt, was ein Artikel abdecken muss, um die Konkurrenz zu schlagen:\n\n`;
+
+    for (const [keyword, briefing] of Object.entries(
+      output.competitorBriefings,
+    )) {
+      const b = briefing as ReverseEngineeredBriefing;
+      md += `### Keyword: \`${keyword}\`\n\n`;
+      md += `- **Format:** ${b.contentFormat}\n`;
+      md += `- **Ziel-Wortanzahl:** ~${b.recommendedWordCount}\n`;
+      md += `- **Kernthemen:** ${b.coreTopicsToCover.join("; ")}\n`;
+      md += `- **Wichtige Entitäten:** ${b.entitiesToInclude.map((e) => `\`${e}\``).join(", ")}\n\n`;
+    }
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 5: Content Gaps — Action Plan
+  // ══════════════════════════════════════════════
+  if (output.contentGaps.length > 0) {
+    md += `---\n\n`;
+    md += `## 🚧 Content Gaps — Fehlende Seiten\n\n`;
+    md += `Die folgenden Seiten existieren auf der Website noch **nicht**, werden aber von der Zielgruppe aktiv gesucht. Sie sind nach Priorität sortiert:\n\n`;
+
+    const highGaps = output.contentGaps.filter((g) => g.priority === "high");
+    const medGaps = output.contentGaps.filter((g) => g.priority === "medium");
+    const lowGaps = output.contentGaps.filter((g) => g.priority === "low");
+
+    if (highGaps.length > 0) {
+      md += `### 🔴 Hohe Priorität (direkt umsatzrelevant)\n\n`;
+      for (const g of highGaps) {
+        md += `- **${g.recommendedTitle}**\n`;
+        md += `  - Keyword: \`${g.targetKeyword}\` · Cluster: ${g.relatedCluster}\n`;
+        md += `  - ${g.rationale}\n\n`;
+      }
+    }
+
+    if (medGaps.length > 0) {
+      md += `### 🟡 Mittlere Priorität (stärkt Autorität)\n\n`;
+      for (const g of medGaps) {
+        md += `- **${g.recommendedTitle}**\n`;
+        md += `  - Keyword: \`${g.targetKeyword}\` · Cluster: ${g.relatedCluster}\n`;
+        md += `  - ${g.rationale}\n\n`;
+      }
+    }
+
+    if (lowGaps.length > 0) {
+      md += `### 🟢 Niedrige Priorität (Top-of-Funnel)\n\n`;
+      for (const g of lowGaps) {
+        md += `- **${g.recommendedTitle}**\n`;
+        md += `  - Keyword: \`${g.targetKeyword}\` · Cluster: ${g.relatedCluster}\n`;
+        md += `  - ${g.rationale}\n\n`;
+      }
+    }
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 6: Autocomplete Insights
+  // ══════════════════════════════════════════════
+  if (output.autocompleteSuggestions.length > 0) {
+    md += `---\n\n`;
+    md += `## 💡 Google Autocomplete — Long-Tail Insights\n\n`;
+    md += `Diese Begriffe stammen direkt aus der Google-Suchleiste und spiegeln echtes Nutzerverhalten wider. Sie eignen sich besonders für **FAQ-Sektionen**, **H2/H3-Überschriften** und **Long-Tail Content**:\n\n`;
+
+    for (const s of output.autocompleteSuggestions) {
+      md += `- ${s}\n`;
+    }
+    md += `\n`;
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 7: Verworfene Begriffe
+  // ══════════════════════════════════════════════
+  if (output.discardedTerms.length > 0) {
+    md += `---\n\n`;
+    md += `## 🗑️ Verworfene Begriffe\n\n`;
+    md += `Die folgenden Begriffe wurden von der KI als **nicht relevant** eingestuft:\n\n`;
+    md += `<details>\n<summary>Alle ${output.discardedTerms.length} verworfenen Begriffe anzeigen</summary>\n\n`;
+    for (const t of output.discardedTerms) {
+      md += `- ${t}\n`;
+    }
+    md += `\n</details>\n\n`;
+  }
+
+  // ══════════════════════════════════════════════
+  // Section 8: Copy-Paste Snippets
+  // ══════════════════════════════════════════════
+  md += `---\n\n`;
+  md += `## 📋 Copy-Paste Snippets\n\n`;
+  md += `Diese Listen sind optimiert für das schnelle Kopieren in SEO-Tools oder Tabellen.\n\n`;
+
+  md += `### Rank-Tracker (z.B. Serpbear) — Ein Keyword pro Zeile\n`;
+  md += `\`\`\`text\n`;
+  md += allKeywords.join("\n");
+  md += `\n\`\`\`\n\n`;
+
+  md += `### Excel / Google Sheets — Kommagetrennt\n`;
+  md += `\`\`\`text\n`;
+  md += allKeywords.join(", ");
+  md += `\n\`\`\`\n\n`;
+
+  md += `### Pillar-Keywords (Nur Primary Keywords)\n`;
+  md += `\`\`\`text\n`;
+  md += output.topicClusters.map((c) => c.primaryKeyword).join("\n");
+  md += `\n\`\`\`\n\n`;
+
+  // ══════════════════════════════════════════════
+  // Footer
+  // ══════════════════════════════════════════════
+  md += `---\n\n`;
+  md += `*Dieser Report wurde automatisch von der @mintel/seo-engine generiert. Alle Daten basieren auf echten Google-Suchergebnissen (via Serper API) und wurden durch ein LLM ausgewertet.*\n`;
+
+  // Write to disk
+  const outDir = path.resolve(process.cwd(), config.outputDir);
+  await fs.mkdir(outDir, { recursive: true });
+  const filename =
+    config.filename ||
+    `seo-report-${config.projectName.toLowerCase().replace(/\s+/g, "-")}.md`;
+  const filePath = path.join(outDir, filename);
+  await fs.writeFile(filePath, md, "utf8");
+  console.log(`[Report] Written SEO Strategy Report to: ${filePath}`);
+  return filePath;
+}
diff --git a/packages/seo-engine/src/steps/content-gap.ts b/packages/seo-engine/src/steps/content-gap.ts
new file mode 100644
index 0000000..ae3e8f2
--- /dev/null
+++ b/packages/seo-engine/src/steps/content-gap.ts
@@ -0,0 +1,84 @@
+import { llmJsonRequest } from "../llm-client.js";
+import type { TopicCluster } from "../types.js";
+
+export interface ExistingPage {
+  url: string;
+  title: string;
+}
+
+export interface ContentGap {
+  recommendedTitle: string;
+  targetKeyword: string;
+  relatedCluster: string;
+  priority: "high" | "medium" | "low";
+  rationale: string;
+}
+
+const CONTENT_GAP_SYSTEM_PROMPT = `
+You are a senior SEO Content Strategist. Your job is to compare a set of TOPIC CLUSTERS
+(keywords the company should rank for) against the EXISTING PAGES on their website.
+
+### OBJECTIVE:
+Identify content gaps — topics/keywords that have NO corresponding page yet.
+For each gap, recommend a page title, the primary target keyword, which cluster it belongs to,
+and a priority (high/medium/low) based on commercial intent and relevance.
+
+### RULES:
+- Only recommend gaps for topics that are genuinely MISSING from the existing pages.
+- Do NOT recommend pages that already exist (even if the title is slightly different — use semantic matching).
+- Priority "high" = commercial/transactional intent, directly drives revenue.
+- Priority "medium" = informational with strong industry relevance.
+- Priority "low" = broad, top-of-funnel topics.
+- LANGUAGE: Match the language of the project context (if German context, recommend German titles).
+
+### OUTPUT FORMAT:
+{
+  "contentGaps": [
+    {
+      "recommendedTitle": "string",
+      "targetKeyword": "string",
+      "relatedCluster": "string",
+      "priority": "high" | "medium" | "low",
+      "rationale": "string"
+    }
+  ]
+}
+`;
+
+export async function analyzeContentGaps(
+  topicClusters: TopicCluster[],
+  existingPages: ExistingPage[],
+  config: { openRouterApiKey: string; model?: string },
+): Promise<ContentGap[]> {
+  if (topicClusters.length === 0) return [];
+  if (existingPages.length === 0) {
+    console.log(
+      "[Content Gap] No existing pages provided, skipping gap analysis.",
+    );
+    return [];
+  }
+
+  const userPrompt = `
+TOPIC CLUSTERS (what the company SHOULD rank for):
+${JSON.stringify(topicClusters, null, 2)}
+
+EXISTING PAGES ON THE WEBSITE:
+${existingPages.map((p, i) => `${i + 1}. "${p.title}" — ${p.url}`).join("\n")}
+
+Identify ALL content gaps. Be thorough but precise.
+`;
+
+  try {
+    const { data } = await llmJsonRequest<{ contentGaps: ContentGap[] }>({
+      model: config.model || "google/gemini-2.5-pro",
+      apiKey: config.openRouterApiKey,
+      systemPrompt: CONTENT_GAP_SYSTEM_PROMPT,
+      userPrompt,
+    });
+
+    return data.contentGaps || [];
+  } catch (err) {
+    console.error("[Content Gap] Analysis failed:", (err as Error).message);
+    return [];
+  }
+}
diff --git a/packages/seo-engine/src/test-run.ts b/packages/seo-engine/src/test-run.ts
new file mode 100644
index 0000000..5ebd6ed
--- /dev/null
+++ b/packages/seo-engine/src/test-run.ts
@@ -0,0 +1,53 @@
+import * as dotenv from "dotenv";
+import { runSeoEngine, createGapDrafts, generateSeoReport } from "./index.js";
+
+dotenv.config({ path: "../../.env" });
+dotenv.config({ path: "../../apps/web/.env" });
+
+async function testSeoEngine() {
+  console.log("Starting SEO Engine test run...\n");
+  const result = await runSeoEngine(
+    {
+      companyName: "KLZ Cables",
+      industry: "Mittelspannungskabel, Kabeltiefbau, Spezialkabel",
+      briefing:
+        "KLZ Cables is a B2B provider of specialized medium-voltage cables. We do NOT do low voltage or generic home cables.",
+      targetAudience: "B2B Einkäufer, Bauleiter, Netzbetreiber",
+      competitors: ["nkt.de", "faberkabel.de"],
+      seedKeywords: ["NA2XS2Y", "VPE-isoliert"],
+      existingPages: [
+        { url: "/produkte", title: "Produkte" },
+        { url: "/kontakt", title: "Kontakt" },
+        { url: "/ueber-uns", title: "Über uns" },
+      ],
+      locale: { gl: "de", hl: "de" },
+    },
+    {
+      serperApiKey: process.env.SERPER_API_KEY || "",
+      openRouterApiKey: process.env.OPENROUTER_API_KEY || "",
+      model: "google/gemini-2.5-pro",
+      maxKeywords: 20,
+    },
+  );
+
+  // Generate the SEO Strategy Report
+  console.log("\n=== GENERATING SEO STRATEGY REPORT ===");
+  const reportPath = await generateSeoReport(result, {
+    projectName: "KLZ Cables",
+    outputDir: ".seo-output",
+  });
+  console.log(`Report saved to: ${reportPath}`);
+
+  // Generate MDX drafts
+  console.log("\n=== GENERATING MDX DRAFTS ===");
+  const generatedFiles = await createGapDrafts(
+    result.contentGaps,
+    new Map(Object.entries(result.competitorBriefings)),
+    { outputDir: ".seo-output/drafts", authorName: "KLZ Content Team" },
+  );
+  console.log(
+    `Generated ${generatedFiles.length} MDX files in .seo-output/drafts/`,
+  );
+}
+
+testSeoEngine().catch(console.error);
diff --git a/packages/seo-engine/src/test-serper.ts b/packages/seo-engine/src/test-serper.ts
new file mode 100644
index 0000000..e37da31
--- /dev/null
+++ b/packages/seo-engine/src/test-serper.ts
@@ -0,0 +1,38 @@
+import * as dotenv from "dotenv";
+import axios from "axios";
+
+dotenv.config({ path: "../../.env" });
+dotenv.config({ path: "../../apps/web/.env" });
+
+async function testSerper() {
+  const query = "Mittelspannungskabel";
+  const apiKey = process.env.SERPER_API_KEY || "";
+
+  if (!apiKey) {
+    console.error("Missing SERPER_API_KEY");
+    return;
+  }
+
+  try {
+    const response = await axios.post(
+      "https://google.serper.dev/search",
+      {
+        q: query,
+        gl: "de",
+        hl: "de",
+      },
+      {
+        headers: {
+          "X-API-KEY": apiKey,
+          "Content-Type": "application/json",
+        },
+      },
+    );
+
+    console.log(JSON.stringify(response.data, null, 2));
+  } catch (error) {
+    console.error("Error:", error);
+  }
+}
+
+testSerper();
diff --git a/packages/seo-engine/src/types.ts b/packages/seo-engine/src/types.ts
new file mode 100644
index 0000000..05ba9f5
--- /dev/null
+++ b/packages/seo-engine/src/types.ts
@@ -0,0 +1,59 @@
+export interface ProjectContext {
+  companyName?: string;
+  industry?: string;
+  briefing?: string;
+  targetAudience?: string;
+  competitors?: string[];
+  seedKeywords?: string[];
+  existingPages?: { url: string; title: string }[];
+  customGuidelines?: string;
+  locale?: { gl: string; hl: string };
+}
+
+export interface SeoConfig {
+  serperApiKey?: string;
+  openRouterApiKey?: string;
+  model?: string;
+  maxKeywords?: number;
+}
+
+export interface KeywordResult {
+  term: string;
+  intent: "informational" | "navigational" | "commercial" | "transactional";
+  relevanceScore: number; // 1-10
+  rationale: string;
+  estimatedVolume?: "high" | "medium" | "low";
+}
+
+export interface TopicCluster {
+  clusterName: string;
+  primaryKeyword: string;
+  secondaryKeywords: KeywordResult[];
+  userIntent: string;
+}
+
+export interface CompetitorRanking {
+  keyword: string;
+  domain: string;
+  position: number;
+  title: string;
+  snippet: string;
+  link: string;
+}
+
+export interface ContentGap {
+  recommendedTitle: string;
+  targetKeyword: string;
+  relatedCluster: string;
+  priority: "high" | "medium" | "low";
+  rationale: string;
+}
+
+export interface SeoEngineOutput {
+  topicClusters: TopicCluster[];
+  competitorRankings: CompetitorRanking[];
+  contentGaps: ContentGap[];
+  autocompleteSuggestions: string[];
+  discardedTerms: string[];
+  competitorBriefings: Record<string, any>; // Map targetKeyword to ReverseEngineeredBriefing
+}
diff --git a/packages/seo-engine/tsconfig.json b/packages/seo-engine/tsconfig.json
new file mode 100644
index 0000000..d277213
--- /dev/null
+++ b/packages/seo-engine/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM"],
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}
diff --git a/packages/seo-engine/tsup.config.ts b/packages/seo-engine/tsup.config.ts
new file mode 100644
index 0000000..30fd6b6
--- /dev/null
+++ b/packages/seo-engine/tsup.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from "tsup";
+
+export default defineConfig({
+  entry: ["src/index.ts"],
+  format: ["esm"],
+  dts: true,
+  clean: true,
+  target: "es2022",
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4f083c2..36691b2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -692,6 +692,40 @@ importers:
         specifier: ^5.6.3
         version: 5.9.3
 
+  packages/seo-engine:
+    dependencies:
+      axios:
+        specifier: ^1.7.9
+        version: 1.13.5
+      cheerio:
+        specifier: 1.0.0-rc.12
+        version: 1.0.0-rc.12
+      dotenv:
+        specifier: ^16.4.7
+        version: 16.6.1
+    devDependencies:
+      '@mintel/eslint-config':
+        specifier: workspace:*
+        version: link:../eslint-config
+      '@mintel/tsconfig':
+        specifier: workspace:*
+        version: link:../tsconfig
+      '@types/node':
+        specifier: ^20.17.17
+        version: 20.19.33
+      tsup:
+        specifier: ^8.3.6
+        version: 8.5.1(@swc/core@1.15.11(@swc/helpers@0.5.18))(jiti@2.6.1)(postcss@8.5.6)(tsx@4.21.0)(typescript@5.9.3)(yaml@2.8.2)
+      tsx:
+        specifier: ^4.19.2
+        version: 4.21.0
+      typescript:
+        specifier: ^5.7.3
+        version: 5.9.3
+      vitest:
+        specifier: ^3.0.5
+        version: 3.2.4(@types/debug@4.1.12)(@types/node@20.19.33)(@vitest/ui@4.0.18(vitest@4.0.18))(happy-dom@20.5.3)(jsdom@27.4.0(canvas@3.2.1))(lightningcss@1.30.2)(sass@1.97.3)(terser@5.46.0)
+
   packages/thumbnail-generator:
     dependencies:
       replicate: