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Sandboxes · 4 November 2026

Start action for Dev environments

POST /v2/dev-environments/{id}:start starts an environment immediately: a paused environment is woken, and a stopped one starts again from its disk, even when spec.state is already running. If spec.state holds another state, it is set to running. The response is the environment. Returns 409 (environment_stopping) while a stop is in progress, and 409 (environment_not_resumable) when the environment's disk was not kept. Every SDK has a start method. GitHub Codespaces' start (POST /user/codespaces/{codespace_name}/start under /compat/github) uses it, so it also starts a codespace that was shut down for being idle.

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