feat: add SEO audit support

AGENTS.md

@@ -1,6 +1,6 @@
 # Everything Claude Code (ECC) — Agent Instructions
 
-This is a **production-ready AI coding plugin** providing 38 specialized agents, 162 skills, 72 commands, and automated hook workflows for software development.
+This is a **production-ready AI coding plugin** providing 39 specialized agents, 163 skills, 72 commands, and automated hook workflows for software development.
 
 **Version:** 1.10.0
 
@@ -145,8 +145,8 @@ Troubleshoot failures: check test isolation → verify mocks → fix implementat
 ## Project Structure
 
 ```
-agents/          — 38 specialized subagents
+agents/          — 39 specialized subagents
-skills/          — 162 workflow skills and domain knowledge
+skills/          — 163 workflow skills and domain knowledge
 commands/        — 72 slash commands
 hooks/           — Trigger-based automations
 rules/           — Always-follow guidelines (common + per-language)

README.md

@@ -236,7 +236,7 @@ For manual install instructions see the README in the `rules/` folder. When copy
 /plugin list ecc@ecc
 ```
 
-**That's it!** You now have access to 38 agents, 162 skills, and 72 legacy command shims.
+**That's it!** You now have access to 39 agents, 163 skills, and 72 legacy command shims.
 
 ### Multi-model commands require additional setup
 
@@ -1152,9 +1152,9 @@ The configuration is automatically detected from `.opencode/opencode.json`.
 
 | Feature | Claude Code | OpenCode | Status |
 |---------|-------------|----------|--------|
-| Agents | PASS: 38 agents | PASS: 12 agents | **Claude Code leads** |
+| Agents | PASS: 39 agents | PASS: 12 agents | **Claude Code leads** |
 | Commands | PASS: 72 commands | PASS: 31 commands | **Claude Code leads** |
-| Skills | PASS: 162 skills | PASS: 37 skills | **Claude Code leads** |
+| Skills | PASS: 163 skills | PASS: 37 skills | **Claude Code leads** |
 | Hooks | PASS: 8 event types | PASS: 11 events | **OpenCode has more!** |
 | Rules | PASS: 29 rules | PASS: 13 instructions | **Claude Code leads** |
 | MCP Servers | PASS: 14 servers | PASS: Full | **Full parity** |
@@ -1261,9 +1261,9 @@ ECC is the **first plugin to maximize every major AI coding tool**. Here's how e
 
 | Feature | Claude Code | Cursor IDE | Codex CLI | OpenCode |
 |---------|------------|------------|-----------|----------|
-| **Agents** | 38 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 |
+| **Agents** | 39 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 |
 | **Commands** | 72 | Shared | Instruction-based | 31 |
-| **Skills** | 162 | Shared | 10 (native format) | 37 |
+| **Skills** | 163 | Shared | 10 (native format) | 37 |
 | **Hook Events** | 8 types | 15 types | None yet | 11 types |
 | **Hook Scripts** | 20+ scripts | 16 scripts (DRY adapter) | N/A | Plugin hooks |
 | **Rules** | 34 (common + lang) | 34 (YAML frontmatter) | Instruction-based | 13 instructions |

README.zh-CN.md

@@ -106,7 +106,7 @@ cp -r everything-claude-code/rules/perl ~/.claude/rules/
 /plugin list ecc@ecc
 ```
 
-**完成！** 你现在可以使用 38 个代理、162 个技能和 72 个命令。
+**完成！** 你现在可以使用 39 个代理、163 个技能和 72 个命令。
 
 ### multi-* 命令需要额外配置
 

WORKING-CONTEXT.md

@@ -10,7 +10,7 @@ Public ECC plugin repo for agents, skills, commands, hooks, rules, install surfa
 
 - Default branch: `main`
 - Public release surface is aligned at `v1.10.0`
-- Public catalog truth is `38` agents, `72` commands, and `162` skills
+- Public catalog truth is `39` agents, `72` commands, and `163` skills
 - Public plugin slug is now `ecc`; legacy `everything-claude-code` install paths remain supported for compatibility
 - Release discussion: `#1272`
 - ECC 2.0 exists in-tree and builds, but it is still alpha rather than GA
@@ -140,6 +140,7 @@ Keep this file detailed for only the current sprint, blockers, and next actions.
 - 2026-04-05: Fixed the remaining OpenCode npm-publish gap in `db6d52e`. The root package now builds `.opencode/dist` during `prepack`, includes the compiled OpenCode plugin assets in the published tarball, and carries a dedicated regression test (`tests/scripts/build-opencode.test.js`) so the package no longer ships only raw TypeScript source for that surface.
 - 2026-04-05: Added `skills/council`, direct-ported the safe `code-tour` lane from `#1193`, and re-synced the repo to `162` skills. `code-tour` stays self-contained and only produces `.tours/*.tour` artifacts with real file/line anchors; no external runtime or extension install is assumed inside the skill.
 - 2026-04-05: Closed the latest auto-generated ECC bundle PR wave (`#1275`-`#1281`) after deploying `ECC-Tools/main` fix `f615905`, which now blocks repo-level issue-comment `/analyze` requests from opening repeated bundle PRs while still allowing PR-thread retry analysis to run against immutable head SHAs.
+- 2026-04-05: Filled the SEO gap by direct-porting `agents/seo-specialist.md` and `skills/seo/SKILL.md` into `main`, then wiring `skills/seo` into `business-content`. This resolves the stale `team-builder` reference to an SEO specialist and brings the public catalog to `39` agents and `163` skills without merging the stale PR wholesale.
 - 2026-04-05: Fixed the stale-row bug in `.github/workflows/monthly-metrics.yml` with `bf5961e`. The workflow now refreshes the current month row in issue `#1087` instead of early-returning when the month already exists, and the dispatched run updated the April snapshot to the current star/fork/release counts.
 - 2026-04-05: Recovered the useful cost-control workflow from the divergent Hermes branch as a small ECC-native operator skill instead of replaying the branch. `skills/ecc-tools-cost-audit/SKILL.md` is now wired into `operator-workflows` and focused on webhook -> queue -> worker tracing, burn containment, quota bypass, premium-model leakage, and retry fanout in the sibling `ECC-Tools` repo.
 - 2026-04-05: Added `skills/council/SKILL.md` in `753da37` as an ECC-native four-voice decision workflow. The useful protocol from PR `#1254` was retained, but the shadow `~/.claude/notes` write path was explicitly removed in favor of `knowledge-ops`, `/save-session`, or direct GitHub/Linear updates when a decision delta matters.

agents/seo-specialist.md

@@ -0,0 +1,62 @@
+---
+name: seo-specialist
+description: SEO specialist for technical SEO audits, on-page optimization, structured data, Core Web Vitals, and content/keyword mapping. Use for site audits, meta tag reviews, schema markup, sitemap and robots issues, and SEO remediation plans.
+tools: ["Read", "Grep", "Glob", "Bash", "WebSearch", "WebFetch"]
+model: sonnet
+---
+
+You are a senior SEO specialist focused on technical SEO, search visibility, and sustainable ranking improvements.
+
+When invoked:
+1. Identify the scope: full-site audit, page-specific issue, schema problem, performance issue, or content planning task.
+2. Read the relevant source files and deployment-facing assets first.
+3. Prioritize findings by severity and likely ranking impact.
+4. Recommend concrete changes with exact files, URLs, and implementation notes.
+
+## Audit Priorities
+
+### Critical
+
+- crawl or index blockers on important pages
+- `robots.txt` or meta-robots conflicts
+- canonical loops or broken canonical targets
+- redirect chains longer than two hops
+- broken internal links on key paths
+
+### High
+
+- missing or duplicate title tags
+- missing or duplicate meta descriptions
+- invalid heading hierarchy
+- malformed or missing JSON-LD on key page types
+- Core Web Vitals regressions on important pages
+
+### Medium
+
+- thin content
+- missing alt text
+- weak anchor text
+- orphan pages
+- keyword cannibalization
+
+## Review Output
+
+Use this format:
+
+```text
+[SEVERITY] Issue title
+Location: path/to/file.tsx:42 or URL
+Issue: What is wrong and why it matters
+Fix: Exact change to make
+```
+
+## Quality Bar
+
+- no vague SEO folklore
+- no manipulative pattern recommendations
+- no advice detached from the actual site structure
+- recommendations should be implementable by the receiving engineer or content owner
+
+## Reference
+
+Use `skills/seo` for the canonical ECC SEO workflow and implementation guidance.

docs/zh-CN/AGENTS.md

@@ -1,6 +1,6 @@
 # Everything Claude Code (ECC) — 智能体指令
 
-这是一个**生产就绪的 AI 编码插件**，提供 38 个专业代理、162 项技能、72 条命令以及自动化钩子工作流，用于软件开发。
+这是一个**生产就绪的 AI 编码插件**，提供 39 个专业代理、163 项技能、72 条命令以及自动化钩子工作流，用于软件开发。
 
 **版本:** 1.10.0
 
@@ -146,8 +146,8 @@
 ## 项目结构
 
 ```
-agents/          — 38 个专业子代理
+agents/          — 39 个专业子代理
-skills/          — 162 个工作流技能和领域知识
+skills/          — 163 个工作流技能和领域知识
 commands/        — 72 个斜杠命令
 hooks/           — 基于触发的自动化
 rules/           — 始终遵循的指导方针（通用 + 每种语言）

docs/zh-CN/README.md

@@ -209,7 +209,7 @@ npx ecc-install typescript
 /plugin list ecc@ecc
 ```
 
-**搞定！** 你现在可以使用 38 个智能体、162 项技能和 72 个命令了。
+**搞定！** 你现在可以使用 39 个智能体、163 项技能和 72 个命令了。
 
 ***
 
@@ -1094,9 +1094,9 @@ opencode
 
 | 功能特性 | Claude Code | OpenCode | 状态 |
 |---------|-------------|----------|--------|
-| 智能体 | PASS: 38 个 | PASS: 12 个 | **Claude Code 领先** |
+| 智能体 | PASS: 39 个 | PASS: 12 个 | **Claude Code 领先** |
 | 命令 | PASS: 72 个 | PASS: 31 个 | **Claude Code 领先** |
-| 技能 | PASS: 162 项 | PASS: 37 项 | **Claude Code 领先** |
+| 技能 | PASS: 163 项 | PASS: 37 项 | **Claude Code 领先** |
 | 钩子 | PASS: 8 种事件类型 | PASS: 11 种事件 | **OpenCode 更多！** |
 | 规则 | PASS: 29 条 | PASS: 13 条指令 | **Claude Code 领先** |
 | MCP 服务器 | PASS: 14 个 | PASS: 完整 | **完全对等** |
@@ -1206,9 +1206,9 @@ ECC 是**第一个最大化利用每个主要 AI 编码工具的插件**。以
 
 | 功能特性 | Claude Code | Cursor IDE | Codex CLI | OpenCode |
 |---------|------------|------------|-----------|----------|
-| **智能体** | 38 | 共享 (AGENTS.md) | 共享 (AGENTS.md) | 12 |
+| **智能体** | 39 | 共享 (AGENTS.md) | 共享 (AGENTS.md) | 12 |
 | **命令** | 72 | 共享 | 基于指令 | 31 |
-| **技能** | 162 | 共享 | 10 (原生格式) | 37 |
+| **技能** | 163 | 共享 | 10 (原生格式) | 37 |
 | **钩子事件** | 8 种类型 | 15 种类型 | 暂无 | 11 种类型 |
 | **钩子脚本** | 20+ 个脚本 | 16 个脚本 (DRY 适配器) | N/A | 插件钩子 |
 | **规则** | 34 (通用 + 语言) | 34 (YAML 前页) | 基于指令 | 13 条指令 |

manifests/install-modules.json

@@ -293,6 +293,7 @@
         "skills/investor-outreach",
         "skills/lead-intelligence",
         "skills/social-graph-ranker",
+        "skills/seo",
         "skills/market-research"
       ],
       "targets": [

skills/seo/SKILL.md

@@ -0,0 +1,154 @@
+---
+name: seo
+description: Audit, plan, and implement SEO improvements across technical SEO, on-page optimization, structured data, Core Web Vitals, and content strategy. Use when the user wants better search visibility, SEO remediation, schema markup, sitemap/robots work, or keyword mapping.
+origin: ECC
+---
+
+# SEO
+
+Improve search visibility through technical correctness, performance, and content relevance, not gimmicks.
+
+## When to Use
+
+Use this skill when:
+- auditing crawlability, indexability, canonicals, or redirects
+- improving title tags, meta descriptions, and heading structure
+- adding or validating structured data
+- improving Core Web Vitals
+- doing keyword research and mapping keywords to URLs
+- planning internal linking or sitemap / robots changes
+
+## How It Works
+
+### Principles
+
+1. Fix technical blockers before content optimization.
+2. One page should have one clear primary search intent.
+3. Prefer long-term quality signals over manipulative patterns.
+4. Mobile-first assumptions matter because indexing is mobile-first.
+5. Recommendations should be page-specific and implementable.
+
+### Technical SEO checklist
+
+#### Crawlability
+
+- `robots.txt` should allow important pages and block low-value surfaces
+- no important page should be unintentionally `noindex`
+- important pages should be reachable within a shallow click depth
+- avoid redirect chains longer than two hops
+- canonical tags should be self-consistent and non-looping
+
+#### Indexability
+
+- preferred URL format should be consistent
+- multilingual pages need correct hreflang if used
+- sitemaps should reflect the intended public surface
+- no duplicate URLs should compete without canonical control
+
+#### Performance
+
+- LCP < 2.5s
+- INP < 200ms
+- CLS < 0.1
+- common fixes: preload hero assets, reduce render-blocking work, reserve layout space, trim heavy JS
+
+#### Structured data
+
+- homepage: organization or business schema where appropriate
+- editorial pages: `Article` / `BlogPosting`
+- product pages: `Product` and `Offer`
+- interior pages: `BreadcrumbList`
+- Q&A sections: `FAQPage` only when the content truly matches
+
+### On-page rules
+
+#### Title tags
+
+- aim for roughly 50-60 characters
+- put the primary keyword or concept near the front
+- make the title legible to humans, not stuffed for bots
+
+#### Meta descriptions
+
+- aim for roughly 120-160 characters
+- describe the page honestly
+- include the main topic naturally
+
+#### Heading structure
+
+- one clear `H1`
+- `H2` and `H3` should reflect actual content hierarchy
+- do not skip structure just for visual styling
+
+### Keyword mapping
+
+1. define the search intent
+2. gather realistic keyword variants
+3. prioritize by intent match, likely value, and competition
+4. map one primary keyword/theme to one URL
+5. detect and avoid cannibalization
+
+### Internal linking
+
+- link from strong pages to pages you want to rank
+- use descriptive anchor text
+- avoid generic anchors when a more specific one is possible
+- backfill links from new pages to relevant existing ones
+
+## Examples
+
+### Title formula
+
+```text
+Primary Topic - Specific Modifier | Brand
+```
+
+### Meta description formula
+
+```text
+Action + topic + value proposition + one supporting detail
+```
+
+### JSON-LD example
+
+```json
+{
+  "@context": "https://schema.org",
+  "@type": "Article",
+  "headline": "Page Title Here",
+  "author": {
+    "@type": "Person",
+    "name": "Author Name"
+  },
+  "publisher": {
+    "@type": "Organization",
+    "name": "Brand Name"
+  }
+}
+```
+
+### Audit output shape
+
+```text
+[HIGH] Duplicate title tags on product pages
+Location: src/routes/products/[slug].tsx
+Issue: Dynamic titles collapse to the same default string, which weakens relevance and creates duplicate signals.
+Fix: Generate a unique title per product using the product name and primary category.
+```
+
+## Anti-Patterns
+
+| Anti-pattern | Fix |
+| --- | --- |
+| keyword stuffing | write for users first |
+| thin near-duplicate pages | consolidate or differentiate them |
+| schema for content that is not actually present | match schema to reality |
+| content advice without checking the actual page | read the real page first |
+| generic “improve SEO” outputs | tie every recommendation to a page or asset |
+
+## Related Skills
+
+- `seo-specialist`
+- `frontend-patterns`
+- `brand-voice`
+- `market-research`