diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39b2a15..36202cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,15 +6,25 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [3.9.8] - 2026-01-20
+
 ### Added
 
-- **AI Ecosystem: AI Coding Agents Matrix reference** — External comparison resource
-  - Added link to coding-agents-matrix.dev in `guide/ai-ecosystem.md` (IDE-Based Tools section)
-  - Added `coding_agents_matrix` entry in `machine-readable/reference.yaml` (ecosystem.complementary)
-  - Provides objective comparison of Claude Code vs 22+ alternatives across 11 technical criteria
-  - Criteria include: MCP support, Skills, Commands, Subagents, Plan Mode
-  - Minimal integration (1-line note) to acknowledge ecosystem without diluting focus
-  - Source: [coding-agents-matrix.dev](https://coding-agents-matrix.dev/) (updated Jan 19, 2026)
+- **AI Ecosystem: AI Coding Agents Matrix integration** — Comprehensive ecosystem resource
+  - **New Section 11** in `guide/ai-ecosystem.md` (~60 lines): "AI Coding Agents Matrix"
+    - Interactive comparison of 23 AI coding agents across 11 technical criteria
+    - What Is It, Why It's Useful, Complementarity table, Interactive Features, Limitations
+    - Positioning: Discovery (Matrix) → Mastery (This Guide)
+    - Maintainers: Packmind (Cédric Teyton, Arthur Magne)
+  - **Enhanced `machine-readable/reference.yaml`** (lines 397-412):
+    - Added: GitHub repo, maintainers, license (Apache-2.0), tech stack (React, Vite, Tailwind)
+    - Added: 4 features (11 criteria, sortable/filterable, community-driven, JSON-based)
+    - Added: positioning note, data freshness warning
+  - **Updated `README.md`** (Section 8: Ecosystem):
+    - Converted complementary resources to comparison table (4 projects)
+    - Added dedicated paragraph for AI Coding Agents Matrix with use case
+    - Positioning: "Use Matrix to discover/compare → Choose Claude Code → Use this guide to master it"
+  - Cross-promotion with [coding-agents-matrix.dev](https://coding-agents-matrix.dev/) (updated Jan 19, 2026)
 
 ## [3.9.7] - 2026-01-20
 
diff --git a/README.md b/README.md
index 3ee2c07..39d46ea 100644
--- a/README.md
+++ b/README.md
@@ -331,10 +331,23 @@ Claude Code sends your prompts, file contents, and MCP results to Anthropic serv
 
 💡 **Architecture**: Separate repos for clear audience separation (devs vs non-devs), bidirectional cross-links for easy navigation.
 
-**Complementary guides**:
-- [claude-code-templates](https://github.com/davila7/claude-code-templates) — Install templates via CLI (17k⭐)
-- [awesome-claude-code](https://github.com/hesreallyhim/awesome-claude-code) — Community tool library
-- [Claude-Code-Everything](https://github.com/wesammustafa/Claude-Code-Everything) — Visual walkthrough
+**Complementary resources**:
+
+| Project | Focus | Best For |
+|---------|-------|----------|
+| [claude-code-templates](https://github.com/davila7/claude-code-templates) | **Distribution** - Install & use | Getting 200+ templates via CLI (17k⭐) |
+| [awesome-claude-code](https://github.com/hesreallyhim/awesome-claude-code) | **Curation** - Discover & link | Exploring community resources |
+| [Claude-Code-Everything](https://github.com/wesammustafa/Claude-Code-Everything) | **Visual walkthrough** | Learning through screenshots |
+| [AI Coding Agents Matrix](https://coding-agents-matrix.dev) | **Technical comparison** | Comparing Claude Code vs 22+ alternatives |
+
+**AI Coding Agents Matrix** (by [Packmind](https://packmind.com)):
+- Interactive comparison: **23 AI coding agents** across **11 technical criteria**
+- Criteria: CLI, MCP Support, Skills, Commands, Subagents, Plan Mode, AGENTS.md, and more
+- Sortable/filterable matrix for precision discovery
+- Open source ([Apache-2.0](https://github.com/PackmindHub/coding-agents-matrix)), community-driven
+- **Use case**: Discovery (Matrix: "Which agent has X feature?") → Mastery (This Guide: "How to use Claude Code?")
+
+**Positioning**: Use Matrix to **discover and compare** → Choose Claude Code → Use this guide to **master it**.
 
 **Community**: 🇫🇷 [Dev With AI](https://www.devw.ai/) — 1500+ devs on Slack, meetups in Paris, Bordeaux, Lyon
 
@@ -369,7 +382,7 @@ Licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
 
 ---
 
-*Version 3.9.7 | January 2026 | Crafted with Claude*
+*Version 3.9.8 | January 2026 | Crafted with Claude*
 
 <!-- SEO Keywords -->
 <!-- claude code, claude code tutorial, anthropic cli, ai coding assistant, claude code mcp,
diff --git a/VERSION b/VERSION
index f69abe4..26cb485 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.9.7
+3.9.8
diff --git a/guide/ai-ecosystem.md b/guide/ai-ecosystem.md
index 3e176e8..de6c40c 100644
--- a/guide/ai-ecosystem.md
+++ b/guide/ai-ecosystem.md
@@ -958,6 +958,71 @@ Docs → Understanding: NotebookLM → Claude Code
 
 ---
 
+## 11. AI Coding Agents Matrix
+
+**URL**: [coding-agents-matrix.dev](https://coding-agents-matrix.dev) | **GitHub**: [PackmindHub/coding-agents-matrix](https://github.com/PackmindHub/coding-agents-matrix) | **License**: Apache-2.0
+
+**Maintainers**: [Packmind](https://packmind.com) (Cédric Teyton, Arthur Magne)
+
+### What Is It?
+
+An **interactive comparison matrix** of 23 AI coding agents across 11 technical criteria:
+
+| Category | Criteria |
+|----------|----------|
+| **Identity** | Open Source status, GitHub stars, first release date |
+| **Packaging** | CLI, Dedicated IDE, IDE Extension, BYO LLM, MCP Support |
+| **Features** | Custom Rules, AGENTS.md, Skills, Commands, Subagents, Plan Mode |
+
+**Agents compared**: Aider, Claude Code, Cursor, GitHub Copilot, Continue, Goose, Windsurf, and 16 others.
+
+### Why It's Useful
+
+**Discovery tool**: When you're choosing which coding agent to adopt, the Matrix helps you filter by specific technical requirements:
+
+- "Show me open source CLI agents with MCP support"
+- "Which agents support the AGENTS.md standard?"
+- "Compare Claude Code vs Cursor features side-by-side"
+
+**Objective data**: No marketing fluff, just feature presence/absence (Yes/No/Partial). Community-driven updates via GitHub issue templates.
+
+### Complementarity with This Guide
+
+| Matrix (Discovery) | This Guide (Mastery) |
+|-------------------|---------------------|
+| "Which agents exist?" | "How to use Claude Code effectively?" |
+| Feature comparison (11 criteria) | Workflows, architecture, TDD/SDD methodologies |
+| 23 agents × shallow | 1 agent × deep (11K lines) |
+| Technical specs | Practical templates (66+), quiz (227 questions) |
+
+**Use case**: Use Matrix to **discover and compare** → Choose Claude Code → Use this guide to **master it**.
+
+### Interactive Features
+
+- **Sortable columns**: Click any criterion to sort ascending/descending
+- **Multi-filter**: Combine filters with AND logic (e.g., "Open Source + MCP Support + Plan Mode")
+- **Search**: Find agents by name, type, or description
+- **Community-driven**: Propose new agents/criteria via GitHub issues
+
+### Limitations
+
+- **Snapshot, not live**: Agents evolve, criteria change. Verify data freshness (last updated: Jan 19, 2026).
+- **Presence/absence only**: Doesn't explain *how* features work or quality differences.
+  - Example: "Claude Code has Plan Mode" (Yes) vs "How Plan Mode works in practice" (not covered)
+- **No workflows**: Doesn't teach you how to use the agents effectively (that's what this guide does).
+- **No performance metrics**: Doesn't benchmark speed, accuracy, or cost.
+
+### Related Resources
+
+- [Packmind](https://packmind.com): Context engineering & governance for AI coding agents
+- [Packmind OSS](https://github.com/PackmindHub/packmind): Framework for versioning AI coding context
+- [Claude Code Templates](https://github.com/davila7/claude-code-templates): 200+ templates for Claude Code (17k⭐)
+- [Awesome Claude Code](https://github.com/hesreallyhim/awesome-claude-code): Curated tool library
+
+**Positioning**: Matrix complements this guide by helping you **choose** the right agent. Once you choose Claude Code, this guide teaches you how to **master** it.
+
+---
+
 ## Alternative Providers (Community Workarounds)
 
 > ⚠️ **Disclaimer**: This section documents techniques that exist in the community
diff --git a/guide/cheatsheet.md b/guide/cheatsheet.md
index 95e8800..06e8600 100644
--- a/guide/cheatsheet.md
+++ b/guide/cheatsheet.md
@@ -6,7 +6,7 @@
 
 **Written with**: Claude (Anthropic)
 
-**Version**: 3.9.7 | **Last Updated**: January 2026
+**Version**: 3.9.8 | **Last Updated**: January 2026
 
 ---
 
@@ -411,4 +411,4 @@ where.exe claude; claude doctor; claude mcp list
 
 **Author**: Florian BRUNIAUX | [@Méthode Aristote](https://methode-aristote.fr) | Written with Claude
 
-*Last updated: January 2026 | Version 3.9.7*
+*Last updated: January 2026 | Version 3.9.8*
diff --git a/guide/ultimate-guide.md b/guide/ultimate-guide.md
index cb4577d..5bad165 100644
--- a/guide/ultimate-guide.md
+++ b/guide/ultimate-guide.md
@@ -10,7 +10,7 @@
 
 **Last updated**: January 2026
 
-**Version**: 3.9.7
+**Version**: 3.9.8
 
 ---
 
@@ -11151,4 +11151,4 @@ Thumbs.db
 
 **Contributions**: Issues and PRs welcome.
 
-**Last updated**: January 2026 | **Version**: 3.9.7
+**Last updated**: January 2026 | **Version**: 3.9.8
diff --git a/machine-readable/reference.yaml b/machine-readable/reference.yaml
index ab1972d..3223d65 100644
--- a/machine-readable/reference.yaml
+++ b/machine-readable/reference.yaml
@@ -3,7 +3,7 @@
 # Source: guide/ultimate-guide.md
 # Purpose: Condensed index for LLMs to quickly answer user questions about Claude Code
 
-version: "3.9.7"
+version: "3.9.8"
 updated: "2026-01-20"
 
 # ════════════════════════════════════════════════════════════════
@@ -396,10 +396,20 @@ ecosystem:
       focus: "Visual walkthrough - Screenshots, BMAD method"
     coding_agents_matrix:
       url: "coding-agents-matrix.dev"
-      focus: "Technical comparison - 23 agents, 11 criteria"
+      github: "github.com/PackmindHub/coding-agents-matrix"
+      maintainer: "Packmind (Cédric Teyton, Arthur Magne)"
+      license: "Apache-2.0"
+      focus: "Interactive comparison of 23 AI coding agents across 11 criteria"
       updated: "2026-01-19"
-      agents: 23
-      criteria: ["MCP", "Skills", "Commands", "Subagents", "Plan Mode"]
+      tech_stack: "React, Vite, Tailwind CSS"
+      features:
+        - "11 technical criteria (CLI, MCP, Skills, Commands, Subagents, Plan Mode, AGENTS.md, BYO LLM, Custom Rules, Dedicated IDE, IDE Extension)"
+        - "Sortable columns and multi-filter (AND logic)"
+        - "Community-driven updates (GitHub issue templates)"
+        - "Open source data structure (JSON-based)"
+      agents_snapshot: 23  # As of 2026-01-19 (evolves over time)
+      positioning: "Discovery tool - Use Matrix to find/compare agents, use this guide to master Claude Code"
+      note: "External resource - verify data freshness as agents/criteria evolve"
   install_templates: "scripts/install-templates.sh"
   cowork:
     description: "Claude Code for non-developers (desktop app)"
@@ -438,7 +448,7 @@ ecosystem:
       - "Cross-links modified → Update all 4 repos"
     history:
       - date: "2026-01-20"
-        event: "Code Landing sync v3.9.7, 66 templates, cross-links"
+        event: "Code Landing sync v3.9.8, 66 templates, cross-links"
         commit: "5b5ce62"
       - date: "2026-01-20"
         event: "Cowork Landing fix (paths, README, UI badges)"