add missed namespace code from rebase

Signed-off-by: Jet Chiang <pokyuen.jetchiang-ext@solo.io>

Author: supreme-gg-gg

go/api/client/agent.go

@@ -3,20 +3,26 @@ package client
 import (
 	"context"
 	"fmt"
+	"net/url"
 
 	api "github.com/kagent-dev/kagent/go/api/httpapi"
 	"github.com/kagent-dev/kagent/go/api/v1alpha2"
 )
 
 // Agent defines the agent operations
 type Agent interface {
-	ListAgents(ctx context.Context) (*api.StandardResponse[[]api.AgentResponse], error)
+	ListAgents(ctx context.Context, opts ...ListAgentsOptions) (*api.StandardResponse[[]api.AgentResponse], error)
 	CreateAgent(ctx context.Context, request *v1alpha2.Agent) (*api.StandardResponse[*v1alpha2.Agent], error)
 	GetAgent(ctx context.Context, agentRef string) (*api.StandardResponse[*api.AgentResponse], error)
 	UpdateAgent(ctx context.Context, request *v1alpha2.Agent) (*api.StandardResponse[*v1alpha2.Agent], error)
 	DeleteAgent(ctx context.Context, agentRef string) error
 }
 
+// ListAgentsOptions configures ListAgents requests.
+type ListAgentsOptions struct {
+	Namespace string
+}
+
 // agentClient handles agent-related requests
 type agentClient struct {
 	client *BaseClient
@@ -27,14 +33,23 @@ func NewAgentClient(client *BaseClient) Agent {
 	return &agentClient{client: client}
 }
 
-// ListAgents lists all agents for a user
-func (c *agentClient) ListAgents(ctx context.Context) (*api.StandardResponse[[]api.AgentResponse], error) {
+// ListAgents lists all agents for a user. When Namespace is set, only agents in that namespace are returned.
+func (c *agentClient) ListAgents(ctx context.Context, opts ...ListAgentsOptions) (*api.StandardResponse[[]api.AgentResponse], error) {
+	if len(opts) > 1 {
+		return nil, fmt.Errorf("ListAgents accepts at most one options argument")
+	}
+
 	userID := c.client.GetUserIDOrDefault("")
 	if userID == "" {
 		return nil, fmt.Errorf("userID is required")
 	}
 
-	resp, err := c.client.Get(ctx, "/api/agents", userID)
+	path := "/api/agents"
+	if len(opts) > 0 && opts[0].Namespace != "" {
+		path += "?namespace=" + url.QueryEscape(opts[0].Namespace)
+	}
+
+	resp, err := c.client.Get(ctx, path, userID)
 	if err != nil {
 		return nil, err
 	}