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docs/modules/core/document-sharding-guide.md

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+# Document Sharding Guide
+
+Comprehensive guide to BMad Method's document sharding system for managing large planning and architecture documents.
+
+## Table of Contents
+
+- [Document Sharding Guide](#document-sharding-guide)
+  - [Table of Contents](#table-of-contents)
+  - [What is Document Sharding?](#what-is-document-sharding)
+    - [Architecture](#architecture)
+  - [When to Use Sharding](#when-to-use-sharding)
+    - [Ideal Candidates](#ideal-candidates)
+  - [How Sharding Works](#how-sharding-works)
+    - [Sharding Process](#sharding-process)
+    - [Workflow Discovery](#workflow-discovery)
+  - [Using the Shard-Doc Tool](#using-the-shard-doc-tool)
+    - [CLI Command](#cli-command)
+    - [Interactive Process](#interactive-process)
+    - [What Gets Created](#what-gets-created)
+  - [Workflow Support](#workflow-support)
+    - [Universal Support](#universal-support)
+
+## What is Document Sharding?
+
+Document sharding splits large markdown files into smaller, organized files based on level 2 headings (`## Heading`). This enables:
+
+- **Selective Loading** - Workflows load only the sections they need
+- **Reduced Token Usage** - Massive efficiency gains for large projects
+- **Better Organization** - Logical section-based file structure
+- **Maintained Context** - Index file preserves document structure
+
+### Architecture
+
+```
+Before Sharding:
+docs/
+└── PRD.md (large 50k token file)
+
+After Sharding:
+docs/
+└── prd/
+    ├── index.md                    # Table of contents with descriptions
+    ├── overview.md                 # Section 1
+    ├── user-requirements.md        # Section 2
+    ├── technical-requirements.md   # Section 3
+    └── ...                         # Additional sections
+```
+
+## When to Use Sharding
+
+### Ideal Candidates
+
+**Large Multi-Epic Projects:**
+
+- Very large complex PRDs
+- Architecture documents with multiple system layers
+- Epic files with 4+ epics (especially for Phase 4)
+- UX design specs covering multiple subsystems
+
+## How Sharding Works
+
+### Sharding Process
+
+1. **Tool Execution**: Run `npx @kayvan/markdown-tree-parser source.md destination/` - this is abstracted with the core shard-doc task which is installed as a slash command or manual task rule depending on your tools.
+2. **Section Extraction**: Tool splits by level 2 headings
+3. **File Creation**: Each section becomes a separate file
+4. **Index Generation**: `index.md` created with structure and descriptions
+
+### Workflow Discovery
+
+BMad workflows use a **dual discovery system**:
+
+1. **Try whole document first** - Look for `document-name.md`
+2. **Check for sharded version** - Look for `document-name/index.md`
+3. **Priority rule** - Whole document takes precedence if both exist - remove the whole document if you want the sharded to be used instead.
+
+## Using the Shard-Doc Tool
+
+### CLI Command
+
+```bash
+/bmad:core:tools:shard-doc 
+```
+
+### Interactive Process
+
+```
+Agent: Which document would you like to shard?
+User: docs/PRD.md
+
+Agent: Default destination: docs/prd/
+       Accept default? [y/n]
+User: y
+
+Agent: Sharding PRD.md...
+       ✓ Created 12 section files
+       ✓ Generated index.md
+       ✓ Complete!
+```
+
+### What Gets Created
+
+**index.md structure:**
+
+```markdown
+# PRD - Index
+
+## Sections
+
+1. [Overview](./overview.md) - Project vision and objectives
+2. [User Requirements](./user-requirements.md) - Feature specifications
+3. [Epic 1: Authentication](./epic-1-authentication.md) - User auth system
+4. [Epic 2: Dashboard](./epic-2-dashboard.md) - Main dashboard UI
+   ...
+```
+
+**Individual section files:**
+
+- Named from heading text (kebab-case)
+- Contains complete section content
+- Preserves all markdown formatting
+- Can be read independently
+
+## Workflow Support
+
+### Universal Support
+
+**All BMM workflows support both formats:**
+
+- ✅ Whole documents
+- ✅ Sharded documents
+- ✅ Automatic detection
+- ✅ Transparent to user