MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Open the Cowart infinite canvas (tldraw) in Vetta Desktop. An agent skill from openvetta/open-vetta.
Apache-2.0Auto-check passed
Install Cowart Open Canvas
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install openvetta/open-vetta cowart-open-canvas --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .claude/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .claude/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvasType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install openvetta/open-vetta cowart-open-canvas --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .agents/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .agents/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install openvetta/open-vetta cowart-open-canvas --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .cursor/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .cursor/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/openvetta/open-vetta.git --path packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install openvetta/open-vetta cowart-open-canvas --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .gemini/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .gemini/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install openvetta/open-vetta cowart-open-canvasInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .github/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .github/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add openvetta/open-vetta --skill cowart-open-canvas -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install openvetta/open-vetta cowart-open-canvas --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/openvetta/open-vetta.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas .opencode/skills/cowart-open-canvas && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cowart-open-canvas" agent skill from https://github.com/openvetta/open-vetta/tree/main/packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas into .opencode/skills/cowart-open-canvas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cowart-open-canvas", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cowart-open-canvas- GitHub stars
- 290
- Token cost
- ~409 tokens
- SKILL.md length
- 146 words
- Files
- 1
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Open the Cowart infinite canvas (tldraw) in Vetta Desktop. An agent skill from openvetta/open-vetta.
- Works in 4 steps: Call plugin tool open_cowart_canvas… → Optionally call MCP… → Canvas data → …
- The user asks to open
- SKILL.md covers Host mapping, Workflow, Image tools (when UI / user… and Constraints
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cowart Open Canvas is an agent skill from openvetta/open-vetta. Open the Cowart infinite canvas (tldraw) in Vetta Desktop. Use when the user asks to open, launch, view, or work in the Cowart canvas or wants an infinite canvas for visual planning/image work.
Its SKILL.md is about 410 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Model Context Protocol. The repository describes itself as: Open-source, local-first AI agent for coding and real work. BYOK models, MCP, skills, plugins, workflows, and private knowledge bases. The licence is Apache-2.0.
When your agent uses it
- The user asks to open
- Work in the Cowart canvas
- Wants an infinite canvas for visual planning/image work
Example prompts
- “/cowart-open-canvas”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Call plugin tool open_cowart_canvas (opens the Cowart activity tab at max width).
- Optionally call MCP render_cowart_canvas_widget with projectDir = user workspace to confirm storage paths.
- Canvas data
- User draws/annotates in the panel. Agent uses MCP tools (get_cowart_*, insert_cowart_image, …) for programmatic canvas IO. UI AI actions…
What it can do on your machine
Read from SKILL.md and the folder at commit b983179. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Cowart Open Canvas loads about 409 tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 146 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from openvetta/open-vetta at commit b983179, republished under its Apache-2.0 licence (© openvetta). 146 words, ~409 tokens.
Download SKILL.mdSave it as
.claude/skills/cowart-open-canvas/SKILL.md (or your agent's skills folder).- name
- cowart-open-canvas
- description
- Open the Cowart infinite canvas (tldraw) in Vetta Desktop. Use when the user asks to open, launch, view, or work in the Cowart canvas or wants an infinite canvas for visual planning/image work.
Cowart Open Canvas (Vetta 1:1)
Host mapping
| Codex | Vetta |
|---|---|
MCP App widget (ui://widget/...) | Activity panel tab with full tldraw App |
window.cowartMcp bridge | Plugin installs the same bridge via ctx.fs + conversation.sendPrompt |
| Canvas files under project | <projectDir>/canvas/ (shared with MCP tools) |
Workflow
- Call plugin tool
open_cowart_canvas(opens the Cowart activity tab at max width). - Optionally call MCP
render_cowart_canvas_widgetwithprojectDir= user workspace to confirm storage paths. - Canvas data:
canvas/cowart-canvas.json
canvas/pages/<page-id>/cowart-canvas.json
canvas/pages/<page-id>/assets/
canvas/cowart-selection.json
canvas/cowart-view-state.json- User draws/annotates in the panel. Agent uses MCP tools (
get_cowart_*,insert_cowart_image, …) for programmatic canvas IO. UI AI actions send follow-up prompts into the active conversation.
Image tools (when UI / user asks for bitmaps)
| Intent | Tool |
|---|---|
| New image | generate_image |
| Edit / annotation revise | edit_image |
Then place with MCP insert_cowart_image. Do not use an imagegen skill.
Constraints
- Never pass the plugin install directory as
projectDir. - Prefer
open_cowart_canvasfor the interactive UI; MCP tools remain available for agent-side canvas edits.
© openvetta, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas of openvetta/open-vetta.
Open the folder on GitHubat commit b983179
Compare with similar skills
Cowart Open Canvas next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cowart Open Canvas this skillopenvetta/open-vetta | 290 | — | ~409 | Automated safety check: Pass | Apache-2.0 | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 4 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Figma use_figma Plugin API Ruleswarpdotdev/warp | 65k | 4 repos | ~4.4k | Automated safety check: Pass | AGPL-3.0 | |
| Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills | 8.5k | 6 repos | ~3.2k | Automated safety check: Notes | Apache-2.0 |
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Related
Works with
Questions about Cowart Open Canvas
What does Cowart Open Canvas do?
Open the Cowart infinite canvas (tldraw) in Vetta Desktop. An agent skill from openvetta/open-vetta. Cowart Open Canvas is an agent skill from openvetta/open-vetta. Open the Cowart infinite canvas (tldraw) in Vetta Desktop.
When should I use Cowart Open Canvas?
Cowart Open Canvas fits situations like: the user asks to open; work in the Cowart canvas; wants an infinite canvas for visual planning/image work.
How do I install Cowart Open Canvas in Claude Code?
Run `npx skills add openvetta/open-vetta --skill cowart-open-canvas -a claude-code`. Or copy the skill folder (packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas in openvetta/open-vetta) into .claude/skills/cowart-open-canvas in your project. Claude Code loads it when a task matches its description.
How do I install Cowart Open Canvas in Codex?
Run `npx skills add openvetta/open-vetta --skill cowart-open-canvas -a codex`. Or copy the skill folder (packages/plugins/externals/cowart-vetta/agent/skills/cowart-open-canvas in openvetta/open-vetta) into .agents/skills/cowart-open-canvas in your project. Codex loads it when a task matches its description.
Can I use Cowart Open Canvas in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add openvetta/open-vetta --skill cowart-open-canvas -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cowart-open-canvas, .gemini/skills/cowart-open-canvas, .github/skills/cowart-open-canvas and .opencode/skills/cowart-open-canvas in your project.
What does Cowart Open Canvas need to run?
SKILL.md names no scripts, command-line tools or credentials: Cowart Open Canvas is instructions for the agent only.
Does Cowart Open Canvas access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Cowart Open Canvas safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Cowart Open Canvas use?
Cowart Open Canvas is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Cowart Open Canvas use?
About 409 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Cowart Open Canvas?
Skills that share tags, products or a category with Cowart Open Canvas: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cowart Open Canvas?
openvetta (a GitHub organization) maintains it in openvetta/open-vetta, which has 290 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 9, 2026.
Source: openvetta/open-vetta on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.