canvas-harness SKILL.md skillA
canvas-harness from hua-bang/pulse-agent is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hua-bang/pulse-agent/canvas-harness@git:20260926.668097bPins git:20260926.668097b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hua-bang/pulse-agent
- Path
apps/canvas-workspace/harness/skills/canvas-harness/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260926.668097b, committed Sep 26, 2026
- First version recorded
- Jul 7, 2026
- Size
- 7,387 bytes
- Repository stars
- 30
- License
- MIT
Use the Canvas Workspace harness in apps/canvas-workspace to launch the real Electron app with controlled profiles, inspect the renderer through CDP, capture screenshots, operate UI controls, collect logs, and clean up sessions. Use for Canvas smoke checks, visual verification, debugging, and agent-operated app validation.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Canvas Harness ## Overview Use the harness as the default agent-facing entrypoint for operating `apps/canvas-workspace`. It wraps the real Electron app without adding harness code to the main process, starts it with a controlled `HOME`, exposes Chrome DevTools Protocol operations, and writes artifacts under `apps/canvas-workspace/.harness/runs/<session-id>/`. Prefer this over `dev:temp-home` when the task needs repeatable launch, renderer inspection, screenshots, UI actions, logs, or cleanup. ## Quick start (default entry, including fresh cloud containers) ```bash pnpm --filter canvas-workspace harness:up # dev mode (default): ~19s to a settled UI pnpm --filter canvas-workspace harness:up --built # production bundle: +~67s app build when stale pnpm --filter canvas-workspace harness:down # close session + stop mock LLM ``` Dev mode runs `electron-vite dev --watch` behind the same CDP session: renderer edits hot-update in place (~2s, no page reload), and main/preload edits rebuild and restart Electron (~12s) on the same CDP port, so harness commands keep working without re-running `harness:up`. Use `--built` …
Read the whole file at its exact version.
How to install
mdr add hua-bang/pulse-agent/canvas-harness@sha256:400be1af3c4b5a89The line at the top of this page pins the label git:20260926.668097b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_utipp5jwnhlkhxwi)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 7, 2026 and Sep 26, 2026, about one every 40 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260926.668097b latest | 2026-09-26 | 668097b | 7,387 B | A | view · diff |
| git:20260911.5720f02 | 2026-09-11 | 5720f02 | 4,809 B | A | view · diff |
| git:20260707.83e3e06 | 2026-07-07 | 83e3e06 | 3,748 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7387 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
hua-bang/pulse-agent · 30 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_utipp5jwnhlkhxwi GET https://markdownregistry.com/api/v1/resolve?ref=hua-bang/pulse-agent/canvas-harness GET https://markdownregistry.com/api/v1/blob/400be1af3c4b5a89b609117ea88009bd08d494958619ca07338f54b4b08dc2cd
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.