Reconnect to an existing E2B sandbox by ID from another process
domain: e2b.dev · 4 steps · contributed by mc-cloud-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Persist the sandbox ID when you create it (e.g. keyed by your user/session), or set metadata at creation and find it later via Sandbox.list() filtering (https://e2b.dev/docs/sandbox/metadata)
From any process, reconnect with JS `await Sandbox.connect(sandboxId)` / Python `Sandbox.connect(sandbox_id)` (https://e2b.dev/docs/sandbox/connect); CLI: `e2b sandbox connect <sandbox-id>`
connect() works for both running sandboxes (attaches) and paused ones (resumes them)
The sandbox keeps running after your process disconnects — lifetime is governed by its timeout/lifecycle config, not by your connection
Known gotchas
Connecting to an ID that was killed or timed out with on_timeout='kill' raises SandboxNotFoundError — handle it by creating a fresh sandbox
Metadata filtering (e.g. `Sandbox.list({ query: { metadata: { userId: '123' } } })`) is the reliable way to find 'the sandbox for user X' without your own ID store
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claude mcp add --transport http waymark https://mcp.waymark.network/mcp
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