workspace-server/internal/handlers/workspace_provision.go

@@ -332,6 +332,7 @@ func (h *WorkspaceHandler) buildProvisionerConfig(
 		InstanceType:    payload.Compute.InstanceType,
 		DiskGB:          int32(payload.Compute.Volume.RootGB),
 		DataPersistence: payload.Compute.DataPersistence,
+		Provider:        payload.Compute.Provider,
 		Display: provisioner.WorkspaceDisplayConfig{
 			Mode:     payload.Compute.Display.Mode,
 			Width:    payload.Compute.Display.Width,

workspace-server/internal/models/workspace.go

@@ -174,6 +174,11 @@ type WorkspaceCompute struct {
 	// disk (wiped each recreate — privacy); "" = auto (desktop-control persists,
 	// others follow the org flag). Forwarded verbatim to CP's data_persistence.
 	DataPersistence string `json:"data_persistence,omitempty"`
+	// Provider is the CLOUD/compute backend for this workspace box (multi-provider
+	// RFC, per-workspace): ""/"aws" = default EC2; "hetzner"/"gcp" route to the
+	// CP WorkspaceProvisioner. Distinct from the LLM/model provider. Forwarded to
+	// CP /cp/workspaces/provision `provider`.
+	Provider string `json:"provider,omitempty"`
 }
 
 type CreateWorkspacePayload struct {

workspace-server/internal/provisioner/cp_provisioner.go

@@ -161,6 +161,9 @@ type cpProvisionRequest struct {
 	Tier         int    `json:"tier"`
 	InstanceType string `json:"instance_type,omitempty"`
 	DiskGB       int32  `json:"disk_gb,omitempty"`
+	// Provider routes the CP to the compute backend for this workspace box
+	// (multi-provider RFC, per-workspace). Distinct from the LLM/model provider.
+	Provider string `json:"provider,omitempty"`
 	// DataPersistence is the per-workspace durable-data choice (internal#734);
 	// CP validates the enum at its provision edge and resolves the data volume
 	// from it. Empty = auto (omitted on the wire).
@@ -257,6 +260,7 @@ func (p *CPProvisioner) Start(ctx context.Context, cfg WorkspaceConfig) (string,
 		InstanceType:    cfg.InstanceType,
 		DiskGB:          cfg.DiskGB,
 		DataPersistence: cfg.DataPersistence,
+		Provider:        cfg.Provider,
 		Display:         cfg.Display,
 		PlatformURL:     cfg.PlatformURL,
 		Env:             env,

workspace-server/internal/provisioner/provisioner.go

@@ -100,6 +100,7 @@ type WorkspaceConfig struct {
 	InstanceType    string // Optional CP EC2 instance type override (SaaS only)
 	DiskGB          int32  // Optional CP root volume size override in GiB (SaaS only)
 	DataPersistence string // internal#734: "persist"|"ephemeral"|"" — durable-data choice forwarded to CP (SaaS only)
+	Provider        string // multi-provider RFC: ""/"aws"|"hetzner"|"gcp" compute backend for the workspace box (per-workspace; distinct from LLM/model provider). Forwarded to CP.
 	Display         WorkspaceDisplayConfig
 	EnvVars         map[string]string // Additional env vars (API keys, etc.)
 	PlatformURL     string