Restart recovery

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. No manual intervention is required, and there is nothing to configure: recovery is always on. 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

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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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How interrupted work is detected

Three complementary mechanisms mark sessions whose turn did not finish:

• At Control UI admission: for an ordinary text turn on an existing main session, the gateway appends the user message, marks the session running, and records its transcript-only delivery claim in one SQLite transaction before returning the started acknowledgement. Commands, attachments, per-turn overrides, pending deliveries, prior abort hints, plugin-owned sessions, and turns with execution hooks keep their specialized admission paths.
• 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. Recovery retries up to 3 times with exponential backoff. Every retry reuses one durable dispatch identifier, so an ambiguous connection failure cannot start the same recovery twice. Completed and unresumable Control UI turns also retain bounded durable idempotency tombstones, allowing a reconnecting outbox to retire them without re-executing the request. Before resuming, the gateway checks that the transcript tail is safe to continue from. If it is not (for example, the turn ended on a stale pending approval), the session is not blindly re-run; the agent instead posts a short notice asking the user to resend the last request. For WebChat, that notice is written directly to the session history so it remains visible after reconnect. OpenClaw can also reconstruct interrupted read-only Code Mode work. Code Mode marks these runs as restart-safe and rejects side-effecting catalog tools or plugin namespaces 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. Side-effecting work remains guarded by the resend notice rather than risking a duplicate write.

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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.

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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. It recovers once the unclean-boot window drains.
• 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.

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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).
• Sessions whose transcript tail cannot be safely continued; these get the resend notice described above instead of a silent re-run.
• 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.