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.
git clone --depth 1 https://github.com/hamr0/liteagentsnpx agentmods add skills/hamr0/liteagents/live-canvasWrote 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/hamr0/liteagents/live-canvas)<a href="https://agentmods.dev/skills/hamr0/liteagents/live-canvas"><img src="https://agentmods.dev/badge/skills/hamr0/liteagents/live-canvas/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/hamr0/liteagents/live-canvas"><img src="https://agentmods.dev/badge/skills/hamr0/liteagents/live-canvas.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 399 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00050 | $0.04925 |
| Opus 5.5 | $0.00020 | $0.01970 |
| Sonnet 5.5 | $0.00010 | $0.00985 |
| Haiku 4.5 | $0.00005 | $0.00492 |
Grade A, and why
live-canvas 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 23d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- live-canvas — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Live Canvas Skill
Interview, generate variants, collect feedback, refine, preview, finalize. Why each rule exists: docs/product/live-canvas-README.md.
Rules
- Always ask the feedback mode with
AskUserQuestion(Live vs JSON), every run. Never auto-select or auto-detect it. - Never run the install or relaunch commands yourself. Print them; the user runs them.
- Never start the dev server, check ports, open a browser or wait for one.
- The overlay is always wired: copy
overlay-vanilla.js, callLiveCanvas.initonce, putdata-varianton every variant container. Never generate a lab without it. - Only delete what this skill created, inside
.claude-design/or listed inroutes:/overlay:. Never a user-authored file; verify each path first. - Temp files never outlive the run. On finish and on abort, clean up (Phase 8.1).
- Never use generic or predefined visual styles; infer them from the project (Phase 0).
Feedback mode
Tool names (plugin-namespaced): mcp__plugin_live-canvas-channel_live-canvas__channel_open, mcp__plugin_live-canvas-channel_live-canvas__batch_open, mcp__plugin_live-canvas-channel_live-canvas__channel_close. Every tool returns JSON {status, port, message?, ...}.
Host: run test "$CLAUDECODE" = 1. If not Claude Code (Droid, Amp, Opencode), skip the question, announce 📝 JSON mode (Live channel requires Claude Code), omit channelUrl and batchEndpoint in the overlay init, never mention the channel plugin, and go to Phase 0.
Claude Code: ask with AskUserQuestion:
| Header | Question | Options |
|---|---|---|
| Feedback mode | Pick a feedback mode | Live channel — overlay streams each Save into this session; requires a session started with live-claude, else Live refuses to start. JSON file — overlay writes feedback to .claude-design/feedback.jsonl; tell me "done" when ready; works in any session. |
If JSON: call mcp__plugin_live-canvas-channel_live-canvas__batch_open.
What ships with it
4 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.
- 23d ago Changed · -776 lines d6fd67f6bc35
- 1mo ago Changed · +4 lines c78267860dd9
- 1mo ago First seen · 1,084 lines · 50 tokens per session scan A 94eb6866fb35
live-canvas is a skill published in the GitHub repository hamr0/liteagents (26 stars, last pushed 3d ago), licensed Apache-2.0. It adds 50 tokens to every session and 4,925 once invoked, about $0.0002 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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