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Fuga Introduces Zero-Downtime Hot Swapping with Agent-Only Retention for In-Flight Coding Tasks

September 17, 2026 at 21:29 EDT

AI Agents
Software Dev & Coding

Fuga has introduced an unsigned runtime hot-swapping architecture paired with agent-only retention, allowing developers and host systems to update management and user-interface layers without terminating long-running autonomous AI agents.

2026-09-18 · Fuga Engineering

Zero-Downtime Hot Swapping with Agent-Only Retention

Fuga decouples outer host and management updates from executing AI agents, enabling seamless background upgrades without killing active worker processes or dropping turn progress.

180s

Retention Fence Lease

Safe transition window for incoming runtime candidates

Worker Task Disruption

Active AI execution streams continue without reset

100%

Turn State Preserved

Handoff proofs guarantee cryptographic continuity

Runtime Upgrade Impact: Worker Interruption Window

Comparison of agent process survival during host updates (each vertical segment represents 30 seconds of protected execution hold).

0s (Abort)

Terminated

Legacy Flow

Process Killed

180s Hold

+30s

Fuga Retention

6 Segments (180s)

Takeaway: Long-running agent tasks survive runtime exchanges without process death or loss of compute progress.

Agent-Only Retention Lifecycle

1. Active Run

Agent Dispatched

Keeper tracks PIDs

→

2. Safe Release

180s Lease Fence

Manifest persisted

→

3. Exchange

Candidate Verified

Proof validated

→

4. Reconnect

Streams Adopted

Zero task loss

Architecture Highlights & Safeguards

• Unchanged Shell Binding: Candidate runtimes verify compatibility against the active signed binary without modifying native packaging.

• Cryptographic Proofs: The new backend validates predecessor handoff tokens before connecting live input/output channels.

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