Runs your code for real against stand-ins for the HTTP services it calls, served together as one environment on one local port or one deployed URL, whether that code is a service you're changing, a frontend, a test suite or a demo.
Install
npx skills add postmanlabs/postman-plugin --skill api-simulationnpx skills add postmanlabs/postman-plugin --skill api-simulation -a claude-code -gnpx skills add postmanlabs/postman-plugin --skill api-simulation -a codex -ggemini skills install https://github.com/postmanlabs/postman-plugin.git --path skills/api-simulationgh skill install postmanlabs/postman-plugin api-simulationgit clone --depth 1 https://github.com/postmanlabs/postman-plugin /tmp/postmanlabs__postman-plugin
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/postmanlabs__postman-plugin/skills/api-simulation ~/.claude/skills/api-simulation # Claude Code
cp -R /tmp/postmanlabs__postman-plugin/skills/api-simulation ~/.agents/skills/api-simulation # Codex, Cursor, Gemini CLI, Copilot, OpenCode