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Restarting the gateway does not lose agent state. Conversations, transcripts, scheduled jobs, background task records, and queued outbound messages all live on disk, and work that was interrupted mid-turn is detected and resumed automatically after the gateway comes back up. Recovery is always on and normally needs no manual intervention. Exhausted infrastructure retries, or a missing durable message-action authority claim, may quarantine one session until you inspect or replace it. This page describes what survives a restart, how interrupted work is detected, and what the automatic resume looks like.

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What survives a restart

Pending delivery rows drain or retry after restart. When a delivery exhausts its retry budget, recovery reclaims expired producer custody; an active producer keeps ownership. Failed deliveries cannot send again, but retain the information needed to settle their owning session or conversation. If that update fails or the gateway crashes, recovery resumes the update without resending the message. After settlement, failed rows discard their payload; only reusable or crash-ambiguous owners keep a minimal bounded or permanent receipt that prevents duplicate delivery. Delivery uncertainty notices retain their acknowledgment, so a repeated settlement cannot notify the same intent again. Finish pending settlements before downgrading. Older builds may discard their metadata during database repair or drop acknowledged notices while rewriting session records, even when the schema version is unchanged. See Database schemas for downgrade precautions.

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Graceful restarts drain first

A requested restart (openclaw gateway restart, a config change that requires a restart, or a gateway update) does not kill in-flight work immediately. The gateway stops accepting new work, then waits for active agent turns and background tasks to finish, up to a drain budget (5 minutes by default). Most restarts therefore interrupt nothing at all. Only work that cannot finish inside the drain budget (or any run interrupted by a forced restart or a crash) is aborted — and before that happens, each affected session is marked for recovery.

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Host sleep and process freezes

When a gateway host wakes from sleep, a virtual machine resumes, or the process continues after a long pause, the gateway detects the freeze within about 30 seconds. It restarts channel connections once tracked Gateway work is idle, then refreshes cached health and presence. The health and presence refresh still runs when a busy gateway defers only the channel restart. This keeps stale sockets from waiting for their normal expiry without interrupting an active reply or agent startup when a busy event loop caused the timer gap. The macOS app and Linux companion cooperate with a local gateway by preparing a short suspension lease before the host sleeps and resuming it after wake. Remote gateways are not suspended when the app host sleeps. A deliberate suspension through gateway.suspend.* keeps recovery deferred until the controller resumes the gateway.

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How interrupted work is detected

Three complementary mechanisms mark sessions whose turn did not finish:
  • At turn admission: for an ordinary text turn on an existing main session, the gateway appends the user message, marks the session running, and records its recovery delivery claim in one SQLite transaction before model or before_agent_reply hook execution. Control UI does this before returning the started acknowledgement; channel dispatch does it when the prepared turn adopts the agent run. Commands, attachments, per-turn overrides, pending deliveries, prior abort hints, plugin-owned sessions, and turns with execution hooks keep their specialized admission paths. If a before_agent_reply hook is installed, admission records enough phase state to distinguish a completed silent result from an ambiguous side-effect window. Recovery dispatches an ordinary user-triggered agent turn, so the currently loaded before_agent_reply hooks run under their normal trigger rules. Ambiguous prior hook outcomes resume with restart-safe tools rather than replaying unrestricted side effects.
  • At shutdown: during the restart drain, every session with an active run is stamped with a recovery marker in the session store before the run is aborted.
  • At startup: the gateway scans session stores for sessions that still claim to be running but have no live owner in the new process. This catches hard crashes and kills where no shutdown code ran. Stale transcript lock files are cleaned up at the same time.

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Automatic resume

A few seconds after startup, the gateway re-dispatches each marked session with a synthetic system message telling the agent its previous turn was interrupted by a restart and to continue from the existing transcript. If a final reply had already been produced but not delivered, its text is included so the agent can deliver it instead of redoing the work. Startup reconciliation retries transient failures up to three times with exponential backoff. Separately, each interrupted main-session cycle has a durable budget of three charged automatic dispatch attempts, retained across gateway restarts. OpenClaw charges an attempt before dispatch, refunds it when the gateway explicitly rejects the request before acceptance, and retains the charge when a post-dispatch result is uncertain to avoid replaying work. Foreground work that already owns the session keeps automatic recovery out until that work settles. After the durable budget is exhausted, the session is tombstoned instead of looping forever. Inspect the failed session and use /new or /reset to start a replacement. openclaw doctor --fix can repair a stale aborted flag that conflicts with a tombstone, but it does not re-enable that recovery cycle. Every retry reuses one durable dispatch identifier, so an ambiguous connection failure cannot start the same recovery twice. Completed Control UI turns also retain bounded durable idempotency tombstones, allowing a reconnecting outbox to retire them without re-executing the request. Message-tool-only replies use a second durable correlation. Before a terminal same-conversation send reaches the channel, the gateway records an unresolved delivery intent on the exact session and source turn. A confirmed provider success resolves it to a durable delivered receipt; a confirmed failure clears it. Recovery completes a delivered receipt without rerunning tools. If a crash leaves the provider outcome unknown, recovery resumes with restart-safe tools so the model can inspect and report the ambiguity without replaying the external effect. The delivered reply is also mirrored into the transcript with its source message ID. Terminal mirrors use a distinct receipt key, so a progress send with the same provider idempotency key cannot mask the terminal marker. Progress sends and receipts from older turns cannot complete the current turn. Only durable channel-ingress claims can restore message-action authority. A resumed run keeps the original source-delivery mode and source correlation, including requester identity and any same-channel/thread restriction, so the same receipt remains authoritative even if another restart happens during recovery. A message-tool-only turn without reconstructable channel authority is tombstoned because OpenClaw cannot safely mint message-action authority without the original channel-ingress claim. The terminal notice directs the user to start a replacement with /new or /reset. Before resuming, the gateway classifies the transcript tail to choose the tool restriction for the continuation. An aborted turn is the interruption itself, so it resumes on a best-effort basis whatever abort detail the provider or worker recorded with it: partial streamed text stays in the transcript and the continuation picks up from the message beneath it, while a tool call left dangling is dropped from the next provider payload and restricted to restart-safe tools unless it is audited replay-safe. Provider failures, completed assistant tails, empty transcripts, and stale pending approvals also continue from the existing transcript. States with ambiguous side effects use restart-safe tools; otherwise the model decides what completed and what remains and can report any uncertainty to the user. OpenClaw can also reconstruct interrupted read-only Code Mode work. Code Mode marks these runs as restart-safe and rejects side-effecting catalog or namespace tool calls before they execute. If a restart lands on the wait control, the new gateway reconstructs the turn from its transcript and forces the reconstructed execution to remain restart-safe even if the model omits or clears that flag. The host filters the entire reconstructed turn to audited read-only core tools and explicitly replay-safe plugin tools, including when Code Mode is disabled after the restart. A non-replay-safe or unmatched Code Mode checkpoint still resumes for model reconciliation, but without Code Mode controls and with the restart-safe tool restriction.

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Subagents

Subagent runs are persisted in the shared SQLite state database, so the subagent registry survives the process. On boot the registry is restored and interrupted subagent sessions are resumed with their original task context. Two safety valves apply:
  • Runs interrupted more than 2 hours ago are finalized instead of resumed, so a gateway that was down overnight does not resurrect stale work.
  • A session that repeatedly fails to recover is tombstoned as wedged so recovery cannot loop forever.

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Background tasks

The background task registry is SQLite-backed and reconciled on boot and on a periodic interval: durable outcomes recorded by finished runs are recovered, and runs whose owning process disappeared are marked lost after a grace period instead of hanging forever.

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Agent-requested restarts

When the agent itself triggers a restart (applying a config change, updating the gateway, or an explicit restart request), a restart sentinel is written to SQLite before the process exits. After boot the gateway posts the outcome back to the originating chat and dispatches a one-shot continuation turn so the agent picks up exactly where it left off, on the same channel and thread. The sentinel’s typed SQLite columns are authoritative for restart handling; its payload_json value is a replay/debug shadow only. Runtime reads, writes, and clears SQLite state without a file fallback. During the storage cutover, a bounded state migration runs at startup and through Doctor to preserve a validated restart-sentinel.json left by the older process after an update. The migration verifies the typed row and removes the source file before normal restart handling continues.

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Safety valves and observability

  • Crash-loop breaker: 3 unclean boots within 5 minutes trip a breaker that suppresses auto-start side services on the next boot, so a crashing gateway does not amplify itself. A continuously stable safe-mode gateway rechecks the breaker after the full unclean-boot window drains and then resumes deferred channel auto-start without requiring another gateway restart. When the breaker is tripped, the control plane still starts, but channel plugins (and other auto-started side services) stay down until an operator manually overrides the suppression or the full window drains with no unclean boots. Recovery preserves channels that an operator manually stopped and any separate development-mode suppression. Gateway logs look like: channel autostart suppressed by crash-loop breaker; refusing automatic start for <channel>… Start a channel manually with: openclaw gateway call channels.start --params '{"channel":"<id>"}' Operator recovery SOP:
    1. Confirm the gateway process is up (openclaw gateway status / LaunchAgent or systemd unit still running). A “channel disconnected” symptom often means suppressed autostart, not a dead gateway.
    2. Inspect channel state: openclaw channels status (add --probe when useful). Look for stopped / not connected accounts while the gateway itself is healthy.
    3. Fix the root cause of the unclean boots (bad config, plugin crash on start, missing secrets) before forcing channels back up.
    4. Manually start a channel while suppression is active:
      channels.start is a manual override; it does not disable the breaker for other channels.
    5. Or leave the healthy gateway running until the full unclean-boot window drains. The same process logs that the restart-loop breaker recovered and starts the deferred configured channels. If that message does not appear after the window plus one health-monitor interval, inspect the gateway logs and run openclaw doctor before restarting.
    See also Gateway (safe mode paragraph) for the same control-plane vs channel-autostart split.
  • Main-session attempt budget: three charged automatic dispatch attempts per interrupted cycle; exhaustion tombstones that session until it is inspected and replaced.
  • Metrics: recovery activity is exported via Prometheus as openclaw_session_recovery_total and openclaw_session_recovery_age_seconds.
  • Logs: recovery decisions are logged under the main-session-restart-recovery and subagent-interrupted-resume subsystems.
  • Reply hooks: resumed turns run currently loaded before_agent_reply hooks under the normal user-trigger rules. Automatically delivered replies also run the normal reply_payload_sending hook before channel delivery, with the recovered session, run, account, and conversation context.

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What is not resumed

  • Sessions excluded from main-session recovery because another owner already handles them: subagent sessions (subagent recovery), cron sessions (the scheduler re-runs on schedule), and ACP-managed sessions (the connected IDE or client owns the resume).
  • Work that was never admitted: messages arriving during the drain window are rejected with an explicit restart error rather than silently queued into a dying process.
  • Gateway terminal PTYs, including operator- and agent-owned terminals. They are process-local and end when the Gateway restarts.
  • Standalone embedded turns cannot take over a main session with pending restart recovery because they do not share the gateway’s lifecycle owner. Run the turn through the gateway or reset it there with /new or /reset.