Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add attentiondotnet/davidondrej-skills --skill markdown-renderinggit clone --depth 1 https://github.com/attentiondotnet/davidondrej-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/attentiondotnet/davidondrej-skills/markdown-rendering)<a href="https://agentmods.dev/skills/attentiondotnet/davidondrej-skills/markdown-rendering"><img src="https://agentmods.dev/badge/skills/attentiondotnet/davidondrej-skills/markdown-rendering.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00084 | $0.00595 |
| Opus 5 | $0.00042 | $0.00298 |
| Sonnet 5 | $0.00017 | $0.00119 |
| Haiku 4.5 | $0.00008 | $0.00060 |
Grade A, and why
markdown-rendering scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Markdown Rendering in cmux
The Problem
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.
So you get stuck: either a stray extra pane, or a blank viewer after moving it.
The Rule
You have exactly two reliable options. Never move-surface a markdown viewer — that is the path that bugs.
Option A — Open it right on the first try
If there is no usable right pane yet, just let cmux create one and leave it where it lands:
cmux markdown open /abs/path/file.md --direction right --focus false
Do NOT then move it. If it spawned where you want it, you're done.
Option B — Close existing right pane(s), then open fresh
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:
# 1. find panes in THIS workspace
cmux list-panes --workspace "$CMUX_WORKSPACE_ID"
# 2. close the unused/irrelevant right pane(s) by closing their surfaces
cmux list-pane-surfaces --pane pane:NN
cmux close-surface --surface surface:XX # repeat per surface in that pane
# 3. THEN open the markdown fresh — it creates its own clean right pane
cmux markdown open /abs/path/file.md --direction right --focus false
Hard Rules
- Never
move-surfacea markdown viewer. It renders blank afterward. This is the core bug this skill exists for. - 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).
- Only close panes that are unused or irrelevant — never close a pane the user is working in.
- Always anchor to
$CMUX_WORKSPACE_ID; never assume the visually focused workspace. - Pass
--focus falseso you don't steal the user's focus. - You can't screenshot/read a markdown surface to verify it. If unsure it rendered, ask the user.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 52 lines · 84 tokens per session scan A 03bf7f97ae2e
markdown-rendering is a skill published in the GitHub repository attentiondotnet/davidondrej-skills (11 stars, last pushed 2mo ago), licensed MIT. It adds 84 tokens to every session and 595 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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