manaflow-ai/cmux
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Markdown Viewer with cmux
cmux-markdown
Open markdown files in a formatted viewer panel with live reload. Use when you need to display plans, documentation, or notes alongside the terminal with rich rendering (headings, code blocks, tables, lists).
SKILL.md
Full skill instructions
Markdown Viewer with cmux
Use this skill to display markdown files in a dedicated panel with rich formatting and live file watching.
Core Workflow
- Write your plan or notes to a
.mdfile. - Open it in a markdown panel.
- The panel auto-updates when the file changes on disk.
# Open a markdown file as a split panel next to the current terminal
cmux markdown open plan.md
# Absolute path
cmux markdown open /path/to/PLAN.md
# Target a specific workspace
cmux markdown open design.md --workspace workspace:2
When to Use
- Displaying an agent plan or task list alongside the terminal
- Showing documentation, changelogs, or READMEs while working
- Reviewing notes that update in real-time (e.g., a plan file being written by another process)
Live File Watching
The panel automatically re-renders when the file changes on disk. This works with:
- Direct writes (
echo "..." >> plan.md) - Editor saves (vim, nano, VS Code)
- Atomic file replacement (write to temp, rename over original)
- Agent-generated plan files that are updated progressively
If the file is deleted, the panel shows a "file unavailable" state. During atomic replace, the panel attempts automatic reconnection within its short retry window. If the file returns later, close and reopen the panel.
Agent Integration
Opening a plan file
Write your plan to a file, then open it:
cat > plan.md << 'EOF'
# Task Plan
## Steps
1. Analyze the codebase
2. Implement the feature
3. Write tests
4. Verify the build
EOF
cmux markdown open plan.md
Updating a plan in real-time
The panel live-reloads, so simply overwrite the file as work progresses:
# The markdown panel updates automatically when the file changes
echo "## Step 1: Complete" >> plan.md
Recommended AGENTS.md instruction
Add this to your project's AGENTS.md to instruct coding agents to use the markdown viewer:
## Plan Display
When creating a plan or task list, write it to a `.md` file and open it in cmux:
cmux markdown open plan.md
The panel renders markdown with rich formatting and auto-updates when the file changes.
Routing
# Open in the caller's workspace (default -- uses CMUX_WORKSPACE_ID)
cmux markdown open plan.md
# Open in a specific workspace
cmux markdown open plan.md --workspace workspace:2
# Open splitting from a specific surface
cmux markdown open plan.md --surface surface:5
# Open in a specific window
cmux markdown open plan.md --window window:1
Deep-Dive References
| Reference | When to Use |
|---|---|
| references/commands.md | Full command syntax and options |
| references/live-reload.md | File watching behavior, atomic writes, edge cases |
Rendering Support
The markdown panel renders:
- Headings (h1-h6) with dividers on h1/h2
- Fenced code blocks with monospaced font
- Inline code with highlighted background
- Tables with alternating row colors
- Ordered and unordered lists (nested)
- Blockquotes with left border
- Bold, italic, strikethrough
- Links (clickable)
- Horizontal rules
- Images (inline)
Supports both light and dark mode.
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