imposter

Imposter Mock Engine - Agent Skills

Agent Skills for working with the Imposter mock engine. These skills teach AI coding agents how to create, configure, and manage API mocks using Imposter.

Also available as a Claude Code plugin.

Available skills

Skill	Description
mocks	Mock APIs with the Imposter mock engine - CLI usage, configuration, Docker, CI/CD, and test integration

Installation

Claude Code plugin (recommended)

Install as a plugin for automatic discovery, version control, and easy updates.

From the marketplace:

# Add the marketplace (one-time setup)
/plugin marketplace add imposter-project/agent-skills

# Install the plugin
/plugin install imposter@imposter-agent-skills

Team/organization setup — add to your project's .claude/settings.json so team members get prompted to install automatically:

{
  "extraKnownMarketplaces": {
    "imposter-agent-skills": {
      "source": {
        "source": "github",
        "repo": "imposter-project/agent-skills"
      }
    }
  }
}

Team members can then install with:

/plugin install imposter@imposter-agent-skills

Local development / testing:

git clone https://github.com/imposter-project/agent-skills.git
claude plugin install --plugin-dir ./agent-skills

After installation, invoke the skill with:

/imposter:mocks

Manual installation (Claude Code)

If you prefer manual setup without the plugin system:

Personal (all projects):

# Clone the repository
git clone https://github.com/imposter-project/agent-skills.git

# Symlink the skill into your personal skills directory
mkdir -p ~/.claude/skills
ln -s "$(pwd)/agent-skills/skills/mocks" ~/.claude/skills/mocks

Project-level (single project):

# From your project root
mkdir -p .claude/skills
cp -r /path/to/agent-skills/skills/mocks .claude/skills/mocks

Or add this repository as a git submodule:

git submodule add https://github.com/imposter-project/agent-skills.git .claude/agent-skills
ln -s ../agent-skills/skills/mocks .claude/skills/mocks

GitHub Copilot (VS Code)

GitHub Copilot in VS Code discovers skills from ~/.copilot/skills/ and ~/.claude/skills/:

# Option 1: Copilot-specific directory
mkdir -p ~/.copilot/skills
ln -s /path/to/agent-skills/skills/mocks ~/.copilot/skills/mocks

# Option 2: Shared directory (works for both Claude Code and Copilot)
mkdir -p ~/.claude/skills
ln -s /path/to/agent-skills/skills/mocks ~/.claude/skills/mocks

Project-level:

# From your project root
mkdir -p .github/skills
cp -r /path/to/agent-skills/skills/mocks .github/skills/mocks

Verify installation

In Claude Code, ask:

What skills are available?

You should see the mocks skill listed. If installed as a plugin, invoke it with:

/imposter:mocks

What's included

skills/
  mocks/
  ├── SKILL.md                          # Main skill instructions
  ├── scripts/
  │   ├── healthcheck.sh                # Check if mock server is healthy
  │   └── wait-for-mock.sh              # Wait for mock server readiness
  └── references/
      ├── ci-cd-github-actions.md       # GitHub Actions integration
      ├── docker.md                     # Docker deployment
      ├── imposter-js.md                # JavaScript/Node.js test bindings
      ├── jvm-embedding.md              # JVM test embedding (JUnit/TestNG)
      └── configuration.md              # Detailed configuration reference

Covered scenarios

• Local development - Install the CLI, start/stop mocks, scaffold configuration from OpenAPI specs, health checking
• CI/CD pipelines - GitHub Actions for setup, starting mocks, running tests, and cleanup
• Docker - Running Imposter containers directly, building self-contained images
• JavaScript tests - Embedding mocks in Jest/Mocha tests with imposter-js
• JVM tests - Embedding mocks in JUnit/TestNG tests with the embedded engine

Links

• Imposter documentation
• Imposter CLI
• Imposter GitHub Actions
• Agent Skills specification
• Configuration examples

License

MIT