A workflow for launching a live preview of a configured service from a repository. It reads the repository's launch settings, starts the selected command, and provides a public preview URL through a tunnel.

Use it after frontend changes or when asked to preview a service that has a .claude/launch.json configuration.

It lets developers inspect UI changes in a browser after pushing code or when they need to preview a service.

preview — Skill for Claude Code and Codex by Deepank308

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/Deepank308/hermes-swe-agent

agentmods

npx agentmods add skills/deepank308/hermes-swe-agent/preview

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/deepank308/hermes-swe-agent/preview/github.svg)](https://agentmods.dev/skills/deepank308/hermes-swe-agent/preview)

Your own site

<a href="https://agentmods.dev/skills/deepank308/hermes-swe-agent/preview"><img src="https://agentmods.dev/badge/skills/deepank308/hermes-swe-agent/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/deepank308/hermes-swe-agent/preview"><img src="https://agentmods.dev/badge/skills/deepank308/hermes-swe-agent/preview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 412 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00030	$0.00412
Opus 5.5	$0.00012	$0.00165
Sonnet 5.5	$0.00006	$0.00082
Haiku 4.5	$0.00003	$0.00041

Measured 1mo ago against content hash 28a68c2833cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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.

skills/preview/SKILL.md · 41 lines

What it actually says

Preview Launcher

Launch live preview environments accessible via public URLs (Cloudflare tunnels).

When to use

After pushing code that changes the UI or frontend.
When the user explicitly asks to see a preview (e.g. "launch preview for client-js").
When the system tells you a git push was detected.

Steps

Check for launch.json — read .claude/launch.json in the workspace root. If it does not exist, tell the user that no preview configuration is available for this repository.
Select configuration:
- If a specific config name was requested (e.g. "launch preview for client-js"), find the configuration with that name.
- If no name was specified, use the configuration with "default": true.
- If no default is set, use the first configuration.
- You can list all available configurations by reading the file.
Run the preview launcher:
```
bash /opt/agent/hermes-swe/ami/preview-launch.sh --name <config-name>
```
The script reads .claude/launch.json, runs the configured command, and creates a Cloudflare tunnel. The preview URL is printed as the last line of stdout.
Share the URL — note the preview URL (e.g. https://preview-*.yourdomain.com) in your response so the user knows where to find the preview. The URL is also automatically attached to the Linear ticket.

Notes

The script is idempotent — safe to call multiple times. It reuses existing tunnels.
Multiple configurations can run simultaneously. Each gets its own tunnel and URL.
Do NOT modify .claude/launch.json or files in .claude/preview/ — they are managed externally.

Changes

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 · 41 lines · 30 tokens per session scan A 28a68c2833cc

Subscribe to this mod's changes

preview is a skill published in the GitHub repository Deepank308/hermes-swe-agent (12 stars, last pushed 6mo ago), licensed MIT. It adds 30 tokens to every session and 412 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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