Allows running multiple parallel dev server instances by isolating their file roots.
Install
mkdir -p .claude/skills/dev-server-sandbox && curl -L -o skill.zip "https://agentskills.codes/api/skills/download/8991" && unzip -o skill.zip -d .claude/skills/dev-server-sandbox && rm skill.zipInstalls to .claude/skills/dev-server-sandbox
Activation
This is the description your AI agent reads to decide when to run this skill — the better it matches your request, the more reliably it fires.
Run multiple isolated mux dev-server instances (temp MUX_ROOT + free ports)Key capabilities
- →Create isolated MUX_ROOT directories
- →Seed configuration files independently
- →Strip conflicting environment variables
- →Assign free ports for parallel execution
- →Disable tutorials in sandbox environments
How it works
It creates a temporary directory for the MUX_ROOT, seeds it with necessary configuration files, strips conflicting environment variables, and launches the server on an available port.
Inputs & outputs
When to use dev-server-sandbox
- →Testing multiple branches simultaneously
- →Running parallel dev servers in git worktrees
- →Isolating backend test environments
About dev-server-sandbox
Creates a fresh, temporary MUX_ROOT directory for each dev server instance, enabling parallel execution without lockfile conflicts. It handles seeding configuration files and stripping conflicting environment variables automatically.
Run multiple isolated mux dev-server instances (temp MUX_ROOT + free ports)
When not to use it
- →Single-instance development environments
- →Production deployment scenarios
Prerequisites
Limitations
- →Does not copy secrets.json
- →Requires manual port management if pinning
How it compares
This approach enables running multiple backend instances in parallel without lockfile conflicts, which is not possible with the standard single-root configuration.
Compared to similar skills
dev-server-sandbox side by side with the closest alternatives in the catalog.
| Skill | Installs | Updated | Safety | Difficulty |
|---|---|---|---|---|
| dev-server-sandbox (this skill) | 0 | 3mo | Review | Advanced |
| applescript | 28 | 10mo | Review | Advanced |
| bazel-build-optimization | 14 | 4mo | No flags | Advanced |
| home-assistant-manager | 9 | 10mo | Review | Advanced |
Try saying
Example prompts that trigger this skill in your AI assistant.
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