overthinkos/mutter
ov-layers/skills/mutter/SKILL.md
GNOME Mutter Wayland compositor running headless inside containers with virtual monitor. Use when working with Mutter, GNOME desktop, or headless compositor setup.
data-ai
Updated Apr 24, 2026
$ install --global
skillsauthnpx skillsauth add overthinkos/overthink-plugins mutterInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 24, 2026, 2:57 PM179.9s1 file scanned
SKILL.md
- name:
- mutter
- description:
- |
mutter -- GNOME Mutter headless Wayland compositor
Layer Properties
| Property | Value |
|----------|-------|
| Dependencies | dbus |
| Service | mutter (supervisord, priority 10) |
| Install files | layer.yml, tasks:, mutter-wrapper |
Environment Variables
| Variable | Value |
|----------|-------|
| XDG_RUNTIME_DIR | /tmp |
| WAYLAND_DISPLAY | wayland-0 |
| XDG_CURRENT_DESKTOP | GNOME |
| XDG_SESSION_TYPE | wayland |
| EGL_LOG_LEVEL | fatal |
Packages
mutter(RPM) -- GNOME Wayland compositor (has hard deps onlibeisandpipewire)xorg-x11-server-Xwayland(RPM) -- XWayland supportmesa-dri-drivers,mesa-vulkan-drivers,libglvnd-egl,libglvnd-gles,egl-wayland(RPM) -- GPU drivers
Startup (mutter-wrapper)
- GPU detection: NVIDIA (CDI env vars), AMD/Intel (DRI render nodes)
- Waits for PipeWire socket (
/tmp/pipewire-0) and D-Bus session socket - Starts
mutter --headless --virtual-monitor 1920x1080 - Waits for Wayland socket, symlinks to
wayland-0if needed - Exports
WAYLAND_DISPLAYandXDG_SESSION_TYPEto D-Bus activation environment
D-Bus Interfaces
Mutter registers native D-Bus interfaces (not Wayland protocols):
org.gnome.Mutter.ScreenCast-- PipeWire-based screen captureorg.gnome.Mutter.RemoteDesktop-- EIS/libei input injectionorg.gnome.Mutter.DisplayConfig-- Display/monitor management
This is architecturally different from KWin (Wayland protocol) and Sway (wlr-screencopy). The D-Bus interfaces work in headless mode.
Key Difference: XDG_SESSION_TYPE
xdg-desktop-portal-gnome requires XDG_SESSION_TYPE=wayland to initialize its display server connection. Without it, ScreenCast/RemoteDesktop interfaces are not registered. This env var is normally set by gdm/gnome-session but must be set explicitly in headless containers.
Related Layers
/ov-layers:dbus-- D-Bus session bus (dependency)/ov-layers:kwin-- KDE compositor (alternative, disabled due to screencast limitation)/ov-layers:sway-- wlroots compositor (alternative)/ov-layers:niri-- Smithay compositor (alternative)/ov-layers:mutter-apps-- GNOME desktop applications/ov-layers:mutter-desktop-- full Mutter desktop composition
Used In Images
Not used in any current image definition. Part of the mutter-desktop metalayer composition.
When to Use This Skill
Use when working with:
- Mutter/GNOME Wayland compositor inside containers
- GNOME-based headless desktop environments
- Portal-based screen capture and input injection
Related
/ov:layer— layer authoring reference (layer.ymlschema, task verbs, service declarations)/ov:test— declarative testing (tests:block,ov image test,ov test)
Related Skills
overthinkos/plugin
tools
VerifiedTrustedCommunity
Use when authoring or modifying a charly PLUGIN — a candy with a `plugin:` block that contributes Providers (verbs/kinds/deploy-targets/steps/builders/commands), its own CUE schema, builtin (compiled-in) or external (out-of-tree git repo). Covers the unified Provider model, the per-plugin CUE-schema contract (single source → Go params for dev + schema-over-Describe RPC for runtime), the SDK, and the loader.
SKILL.mdUpdated Jun 22, 2026
overthinkos/cue
tools
VerifiedTrustedCommunity
The CUE data-validation / configuration CLI (cue), pinned to v0.16.1. Use when working with the cue candy, installing the cue binary into a box or onto a target:local dev host, or running the offline schema-vendoring pipeline that feeds charly's egress validation.
SKILL.mdUpdated Jun 16, 2026
overthinkos/egress
tools
VerifiedTrustedCommunity
CUE EGRESS validation — validating (and, where it adds value, generating) the config files charly WRITES to a system BEFORE the bytes hit disk. MUST be invoked before working on charly/egress.go, the vendored schemas under candy/plugin-egress/egress-schemas/vendor/, the ValidateEgress / registerVendoredEgressKind path, the offline `task cue:vendor` pipeline, or adding an egress schema for any written artifact (cloud-init, k8s manifests, traefik routes, runtime config, install ledger, systemd/quadlet units, ssh_config, libvirt XML).
SKILL.mdUpdated Jun 16, 2026
overthinkos/check-k8s
tools
VerifiedTrustedCommunity
Kubernetes cluster-probe declarative check verb — the `kube:` check verb (nodes, pods, ingress, storage class, addon health, apply/delete, and arbitrary resource GETs) served out-of-process by the candy/plugin-kube plugin (vendored client-go; no external kubectl required).
SKILL.mdUpdated Jun 14, 2026