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 manhvann/codexkit --skill previewgit clone --depth 1 https://github.com/manhvann/codexkitWrote 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/manhvann/codexkit/preview)<a href="https://agentmods.dev/skills/manhvann/codexkit/preview"><img src="https://agentmods.dev/badge/skills/manhvann/codexkit/preview/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/manhvann/codexkit/preview"><img src="https://agentmods.dev/badge/skills/manhvann/codexkit/preview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00017 | $0.00707 |
| Opus 5.5 | $0.00007 | $0.00283 |
| Sonnet 5.5 | $0.00003 | $0.00141 |
| Haiku 4.5 | $0.00002 | $0.00071 |
Grade A, and why
ck:preview 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 1mo 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 — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Preview
Universal viewer + visual generator. View existing content OR generate new visual explanations.
Default (No Arguments)
If invoked without arguments, ask the user to choose available preview operations:
| Operation | Description |
|---|---|
(view) |
View a file or directory |
--explain |
Generate visual explanation |
--slides |
Generate presentation slides |
--diagram |
Generate architecture diagram |
--ascii |
Terminal-friendly diagram |
--stop |
Stop preview server |
Present options with header "Preview Operation", question "What would you like to do?".
Usage
View Mode
$preview <file.md>- View markdown file in novel-reader UI$preview <directory/>- Browse directory contents$preview --stop- Stop running server
Generation Mode
$preview --explain <topic>- Generate visual explanation (ASCII + Mermaid + prose)$preview --slides <topic>- Generate presentation slides (one concept per slide)$preview --diagram <topic>- Generate focused diagram (ASCII + Mermaid)$preview --ascii <topic>- Generate ASCII-only diagram (terminal-friendly)
Argument Resolution
When processing arguments, follow this priority order:
--stop→ Stop server (exit)- Generation flags (
--explain,--slides,--diagram,--ascii) → Generation mode. Loadreferences/generation-modes.md - Resolve path from argument:
- If argument is an explicit path → use directly
- If argument is a contextual reference → resolve from recent conversation context
- Resolved path exists on filesystem → View mode. Load
references/view-mode.md - Path doesn't exist or can't resolve → Ask user to clarify
Topic-to-slug conversion:
- Lowercase the topic
- Replace spaces/special chars with hyphens
- Remove non-alphanumeric except hyphens
- Collapse multiple hyphens → single hyphen
- Trim leading/trailing hyphens
- Max 80 chars - truncate at word boundary if longer
Multiple flags: If multiple generation flags provided, use first one; remaining treated as topic.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 76 lines · 17 tokens per session scan A f9285fdc4e30
ck:preview is a skill published in the GitHub repository manhvann/codexkit (89 stars, last pushed 1mo ago), licensed MIT. It adds 17 tokens to every session and 707 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-30.
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