📦 deps(thirdparty): update snapshots
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name: markdown-rendering
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description: "Open Markdown reliably in cmux panes and recover from blank rendered surfaces."
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category: productivity
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risk: safe
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source: community
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source_repo: davidondrej/skills
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source_type: community
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date_added: "2026-07-07"
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author: davidondrej
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tags: [markdown, cmux, rendering]
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tools: [claude, codex]
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license: "MIT"
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license_source: "https://github.com/davidondrej/skills/blob/main/LICENSE"
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---
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# Markdown Rendering in cmux
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## When to Use
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- Use when opening Markdown in cmux shows a blank pane or wrong layout.
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- Use when you need to display a Markdown file in a stable cmux right pane.
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## The Problem
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`cmux markdown open` defaults to **spawning a brand-new pane** every time, even with `--direction right`. The common "fix" — moving the new markdown surface into the existing right pane with `move-surface` — **bugs out: the moved viewer renders BLANK.** The surface keeps `type=markdown` and looks healthy, but shows nothing.
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So you get stuck: either a stray extra pane, or a blank viewer after moving it.
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## The Rule
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You have exactly two reliable options. **Never `move-surface` a markdown viewer** — that is the path that bugs.
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### Option A — Open it right on the first try
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If there is no usable right pane yet, just let cmux create one and leave it where it lands:
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```bash
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cmux markdown open /abs/path/file.md --direction right --focus false
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```
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Do NOT then move it. If it spawned where you want it, you're done.
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### Option B — Close existing right pane(s), then open fresh
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If there are other right panes in the way (and they're unused or irrelevant), **close them first**, then open the markdown fresh as a new right pane:
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```bash
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# 1. find panes in THIS workspace
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cmux list-panes --workspace "$CMUX_WORKSPACE_ID"
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# 2. close the unused/irrelevant right pane(s) by closing their surfaces
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cmux list-pane-surfaces --pane pane:NN
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cmux close-surface --surface surface:XX # repeat per surface in that pane
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# 3. THEN open the markdown fresh — it creates its own clean right pane
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cmux markdown open /abs/path/file.md --direction right --focus false
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```
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## Hard Rules
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- **Never `move-surface` a markdown viewer.** It renders blank afterward. This is the core bug this skill exists for.
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- Open it correctly the first time (Option A), OR close the conflicting right pane(s) and open a fresh right pane from scratch (Option B).
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- Only close panes that are unused or irrelevant — never close a pane the user is working in.
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- Always anchor to `$CMUX_WORKSPACE_ID`; never assume the visually focused workspace.
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- Pass `--focus false` so you don't steal the user's focus.
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- You can't screenshot/read a markdown surface to verify it. If unsure it rendered, ask the user.
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## Limitations
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- Adapted from `davidondrej/skills`; verify local paths, tools, credentials, and agent features before acting.
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- For commands, remote access, scheduling, browser automation, or file-changing workflows, get explicit user approval and confirm the target environment first.
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