Agents can now provision their sandbox on a connected fleet node instead of the
gateway host. Local stays the strict default, so existing agents are byte-for-
byte unaffected until explicitly placed elsewhere.
Security parity: the daemon links the REAL cm-sandbox DockerDriver and runs the
typed container ops (sb_provision/sb_exec/sb_destroy/sb_health/sb_list) through
it — identical hardening (cap-drop ALL, seccomp, no-net, read-only, non-root) to
local sandboxes. cm-sandbox spec types are now Serialize/Deserialize so the spec
crosses the channel.
- cm-api: RemoteDriver (impl SandboxDriver over the node channel) + HubDriverProvider
(impl cm_runtime::NodeDriverProvider, hands out a driver only for connected
nodes via a sync online set) + NodeHub.call/is_connected. AppState.with_node_hub
so the hub is shared with the placement provider.
- cm-runtime SandboxManager: driver_for(node_id) routes by the recorded
agent_containers.node_id (local default = existing driver, identical path);
placement_node() reads the workspace setting and falls back to local if the
node is offline; exec/release route accordingly. NodeDriverProvider trait.
- DB: 0020_workspace_placement + repo (for_agent/get/set/clear).
- main.rs: build the NodeHub first; inject HubDriverProvider into the agent
manager + share the hub with AppState.
- API+UI: GET/PUT /api/fleet/placement + a "Run agents on: Local / <node>"
selector in the Fleet overview.
Note: a node must be able to pull the agent image (the daemon docker-pulls it);
interactive PTY for agent containers on remote nodes is not wired (Terminal app
stays local) — the in-dashboard node shell already covers host access.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
