Agentic Sandbox v2026.8.10

Agentic Sandbox v2026.8.10

Status: Prepared 2026-08-31; never tagged or published. These changes ship in v2026.9.0.

Planned tag (never cut): `v2026.8.10`

Previous tag: `v2026.8.9`

Compare: `v2026.8.9...v2026.8.10`

Highlights

  • Prevent ambiguous management mutations from being replayed through the

legacy v1 fallback path.

  • Reconcile authoritative instance state before allowing an operator to retry

a mutation whose outcome is unknown.

  • Negotiate management WebSocket capabilities before sending commands and

replace wildcard subscriptions with scoped inventory requests.

  • Require the `pty-ws.v1` subprotocol for browser PTY sessions.
  • Harden Celld qualification takeover and exact-owned cleanup behavior.

Upgrade

Upgrade `agentic-mgmt`, `agent-client`, and `agentic-cli` together:

curl -fsSLO https://github.com/jmagly/agentic-sandbox/releases/download/v2026.8.10/agentic-sandbox-install.sh
bash agentic-sandbox-install.sh --version v2026.8.10

No data migration is required. Operators using the management dashboard should reload it after upgrading the management server so the browser receives the new API fallback and WebSocket negotiation behavior.

Verification

Verify downloaded assets and public images using the release verification guide. In the dashboard, confirm that the connection indicator progresses through negotiation to Connected and that instance actions refresh authoritative state if their response is interrupted.

The release source passed the complete repository `make check` suite. Browser contract coverage verifies safe-read fallback, mutation non-replay and intent keys, no pre-hello WebSocket commands, scoped inventory startup, and strict PTY subprotocol selection.

Operational status

Celld remains experimental, disabled by default, and production `NO-GO`. This release improves qualification recovery and cleanup safety but does not claim runtime promotion or exact-head production qualification.

Management WebSocket issue #803 remains open for its broader unsupported- version, backpressure, visibility-aware reconnect, replay, and origin matrix.

Rollback

Rollback management, agent, and CLI binaries together to v2026.8.9. No data migration is performed by this release.

Full notes: CHANGELOG entry 2026.8.10.