fix(agent/agentcontainers): do not reassign proc.agent until success

mafredri · mafredri · commit 20d2cf1ade0c · 2025-06-26T17:19:11.000Z
diff --git a/agent/agentcontainers/api.go b/agent/agentcontainers/api.go
@@ -1479,7 +1479,9 @@ func (api *API) maybeInjectSubAgentIntoContainerLocked(ctx context.Context, dc c
 		originalName := subAgentConfig.Name
 
 		for attempt := 1; attempt <= maxAttemptsToNameAgent; attempt++ {
-			if proc.agent, err = client.Create(ctx, subAgentConfig); err == nil {
+			agent := proc.agent
+			if agent, err = client.Create(ctx, subAgentConfig); err == nil {
+				proc.agent = agent // Only reassign on success.
 				if api.usingWorkspaceFolderName[dc.WorkspaceFolder] {
 					api.devcontainerNames[dc.Name] = true
 					delete(api.usingWorkspaceFolderName, dc.WorkspaceFolder)
diff --git a/agent/agentcontainers/subagent.go b/agent/agentcontainers/subagent.go
@@ -188,7 +188,7 @@ func (a *subAgentAPIClient) List(ctx context.Context) ([]SubAgent, error) {
 	return agents, nil
 }
 
-func (a *subAgentAPIClient) Create(ctx context.Context, agent SubAgent) (SubAgent, error) {
+func (a *subAgentAPIClient) Create(ctx context.Context, agent SubAgent) (_ SubAgent, err error) {
 	a.logger.Debug(ctx, "creating sub agent", slog.F("name", agent.Name), slog.F("directory", agent.Directory))
 
 	displayApps := make([]agentproto.CreateSubAgentRequest_DisplayApp, 0, len(agent.DisplayApps))
@@ -233,19 +233,27 @@ func (a *subAgentAPIClient) Create(ctx context.Context, agent SubAgent) (SubAgen
 	if err != nil {
 		return SubAgent{}, err
 	}
+	defer func() {
+		if err != nil {
+			// Best effort.
+			_, _ = a.api.DeleteSubAgent(ctx, &agentproto.DeleteSubAgentRequest{
+				Id: resp.GetAgent().GetId(),
+			})
+		}
+	}()
 
-	agent.Name = resp.Agent.Name
-	agent.ID, err = uuid.FromBytes(resp.Agent.Id)
+	agent.Name = resp.GetAgent().GetName()
+	agent.ID, err = uuid.FromBytes(resp.GetAgent().GetId())
 	if err != nil {
-		return agent, err
+		return SubAgent{}, err
 	}
-	agent.AuthToken, err = uuid.FromBytes(resp.Agent.AuthToken)
+	agent.AuthToken, err = uuid.FromBytes(resp.GetAgent().GetAuthToken())
 	if err != nil {
-		return agent, err
+		return SubAgent{}, err
 	}
 
-	for _, appError := range resp.AppCreationErrors {
-		app := apps[appError.Index]
+	for _, appError := range resp.GetAppCreationErrors() {
+		app := apps[appError.GetIndex()]
 
 		a.logger.Warn(ctx, "unable to create app",
 			slog.F("agent_name", agent.Name),
