Local marketplace for agentviewer plugin development
npx claudepluginhub pengelbrecht/agentviewerDisplay rich content (markdown, code, diffs, diagrams) in a browser-based tabbed viewer for AI agents
pengelbrechtA localhost web server that allows AI agents (Claude Code, etc.) to display rich content to users in a browser.
┌─────────────────┐ WebSocket ┌─────────────────┐
│ Browser Tab │◄────────────────►│ agentviewer │
│ (localhost) │ │ HTTP Server │
└─────────────────┘ └────────▲────────┘
│ REST API (curl)
┌────────┴────────┐
│ Claude / Agent │
└─────────────────┘
brew install pengelbrecht/tap/agentviewer
scoop bucket add agentviewer https://github.com/pengelbrecht/scoop-agentviewer
scoop install agentviewer
winget install pengelbrecht.agentviewer
Note: Winget package pending submission to winget-pkgs repository.
Download from GitHub Releases:
# Download and add to PATH
Invoke-WebRequest -Uri "https://github.com/pengelbrecht/agentviewer/releases/latest/download/agentviewer-windows-amd64.exe" -OutFile "$env:LOCALAPPDATA\agentviewer.exe"
$env:PATH += ";$env:LOCALAPPDATA"
Or download agentviewer-windows-amd64.exe manually and add to your PATH.
# Download and install .deb package
curl -LO https://github.com/pengelbrecht/agentviewer/releases/latest/download/agentviewer_$(uname -m | sed 's/x86_64/amd64/' | sed 's/aarch64/arm64/').deb
sudo dpkg -i agentviewer_*.deb
# Download and install .rpm package
curl -LO https://github.com/pengelbrecht/agentviewer/releases/latest/download/agentviewer_$(uname -m).rpm
sudo rpm -i agentviewer_*.rpm
Download the latest release for your platform:
# Detect platform and download
curl -L "https://github.com/pengelbrecht/agentviewer/releases/latest/download/agentviewer-$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -m | sed 's/x86_64/amd64/' | sed 's/aarch64/arm64/')" -o agentviewer
chmod +x agentviewer
sudo mv agentviewer /usr/local/bin/
Or download manually from GitHub Releases.
Available binaries:
agentviewer-darwin-arm64 - macOS Apple Silicon (M1/M2/M3)agentviewer-darwin-amd64 - macOS Intelagentviewer-linux-amd64 - Linux x86_64agentviewer-linux-arm64 - Linux ARM64agentviewer-windows-amd64.exe - Windows x86_64Available packages (version-less for stable URLs):
agentviewer_amd64.deb / agentviewer_arm64.deb - Debian/Ubuntuagentviewer_x86_64.rpm / agentviewer_aarch64.rpm - Fedora/RHELIf you have Go 1.22+ installed:
go install github.com/pengelbrecht/agentviewer@latest
git clone https://github.com/pengelbrecht/agentviewer
cd agentviewer
make install
This installs to $GOBIN (usually ~/go/bin). Ensure this is in your PATH.
agentviewer --version
agentviewer serve --help
Start the server (opens browser automatically):
agentviewer serve --open
Create content via API:
curl -X POST http://localhost:3333/api/tabs \
-H "Content-Type: application/json" \
-d '{"title": "Hello", "type": "markdown", "content": "# Hello World\n\nThis is **bold** text."}'
View in browser at http://localhost:3333
# Start server (foreground, blocks)
agentviewer serve
# Start server and open browser
agentviewer serve --open
# Custom port
agentviewer serve --port 4000
# Start with initial file
agentviewer serve --open README.md
Base URL: http://localhost:3333/api
| Method | Endpoint | Description |
|---|---|---|
| POST | /api/tabs | Create or update a tab |
| GET | /api/tabs | List all tabs |
| GET | /api/tabs/:id | Get tab content |
| DELETE | /api/tabs/:id | Delete a tab |
| DELETE | /api/tabs | Delete all tabs |
| POST | /api/tabs/:id/activate | Switch to a tab |
| GET | /api/status | Server status |
Create markdown tab:
curl -X POST localhost:3333/api/tabs \
-d '{"title": "Notes", "type": "markdown", "content": "# My Notes\n\n- Item 1\n- Item 2"}'
Development marketplace for Superpowers core skills library
Harness-native ECC skills, hooks, rules, MCP conventions, and operator workflows
Open Design — local-first design app exposed to coding agents over MCP. Install once with your agent's plugin command and projects/files/skills are reachable through stdio.