diff --git a/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke.go b/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke.go
index 16c62eb2ae2..350ce18846f 100644
--- a/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke.go
+++ b/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke.go
@@ -954,6 +954,7 @@ func (a *InvokeAction) responsesRemote(ctx context.Context) error {
 	}
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", "Bearer "+rc.bearerToken)
+	req.Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	applyIsolationHeaders(req, &a.flags.isolationHeaderFlags)
 	if raw {
 		// Disable Go's transparent gzip handling so the dumped headers and
@@ -1181,6 +1182,7 @@ func (a *InvokeAction) invocationsRemote(ctx context.Context) error {
 	}
 	req.Header.Set("Content-Type", contentTypeForBody(body))
 	req.Header.Set("Authorization", "Bearer "+rc.bearerToken)
+	req.Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	applyIsolationHeaders(req, &a.flags.isolationHeaderFlags)
 	if raw {
 		// Disable Go's transparent gzip handling so the dumped headers and
@@ -1525,6 +1527,7 @@ func handleInvocationLRO(
 		if bearerToken != "" {
 			req.Header.Set("Authorization", "Bearer "+bearerToken)
 		}
+		req.Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 		options.ApplyHeaders(req.Header)
 		if raw {
 			// Disable Go's transparent gzip handling so the dumped headers
@@ -1645,6 +1648,7 @@ func createConversation(
 	}
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", "Bearer "+bearerToken)
+	req.Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Header)
 
 	client := &http.Client{Timeout: 30 * time.Second}
diff --git a/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke_test.go b/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke_test.go
index 4db3f79e9ad..2beb166641f 100644
--- a/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke_test.go
+++ b/cli/azd/extensions/azure.ai.agents/internal/cmd/invoke_test.go
@@ -1664,6 +1664,9 @@ func assertPollRequestsHaveHeaders(
 		if got := r.Header.Get("Authorization"); got != "Bearer token" {
 			t.Errorf("poll %d: Authorization = %q, want Bearer token", pollNumber, got)
 		}
+		if got := r.Header.Get("Foundry-Features"); got != "HostedAgents=V1Preview" {
+			t.Errorf("poll %d: Foundry-Features = %q, want HostedAgents=V1Preview", pollNumber, got)
+		}
 		if got := r.Header.Get(agent_api.AgentUserIsolationKeyHeader); got != wantUser {
 			t.Errorf("poll %d: %s = %q, want %q", pollNumber, agent_api.AgentUserIsolationKeyHeader, got, wantUser)
 		}
@@ -1832,6 +1835,9 @@ func TestCreateConversation_PropagatesIsolationHeaders(t *testing.T) {
 	}
 
 	request := <-reqCh
+	if got := request.Header.Get("Foundry-Features"); got != "HostedAgents=V1Preview" {
+		t.Errorf("Foundry-Features = %q, want HostedAgents=V1Preview", got)
+	}
 	if got := request.Header.Get(agent_api.AgentUserIsolationKeyHeader); got != "user-1" {
 		t.Errorf("%s = %q, want user-1", agent_api.AgentUserIsolationKeyHeader, got)
 	}
diff --git a/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations.go b/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations.go
index a9e29b83118..8d966d63fdf 100644
--- a/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations.go
+++ b/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations.go
@@ -816,6 +816,7 @@ func (c *AgentClient) GetAgentSessionLogStream(
 
 	req.Header.Set("Authorization", "Bearer "+token.Token)
 	req.Header.Set("User-Agent", fmt.Sprintf("azd-ext-azure-ai-agents/%s", version.Version))
+	req.Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Header)
 
 	httpClient := &http.Client{}
@@ -1189,7 +1190,7 @@ func (c *AgentClient) CreateSession(
 		return nil, fmt.Errorf("failed to set request body: %w", err)
 	}
 
-	req.Raw().Header.Set("Foundry-Features", "AgentEndpoints=V1Preview")
+	req.Raw().Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Raw().Header)
 
 	resp, err := c.pipeline.Do(req)
@@ -1240,7 +1241,7 @@ func (c *AgentClient) GetSession(
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
 
-	req.Raw().Header.Set("Foundry-Features", "AgentEndpoints=V1Preview")
+	req.Raw().Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Raw().Header)
 
 	resp, err := c.pipeline.Do(req)
@@ -1291,7 +1292,7 @@ func (c *AgentClient) DeleteSession(
 		return fmt.Errorf("failed to create request: %w", err)
 	}
 
-	req.Raw().Header.Set("Foundry-Features", "AgentEndpoints=V1Preview")
+	req.Raw().Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Raw().Header)
 
 	resp, err := c.pipeline.Do(req)
@@ -1340,7 +1341,7 @@ func (c *AgentClient) ListSessions(
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
 
-	req.Raw().Header.Set("Foundry-Features", "AgentEndpoints=V1Preview")
+	req.Raw().Header.Set("Foundry-Features", "HostedAgents=V1Preview")
 	options.ApplyHeaders(req.Raw().Header)
 
 	resp, err := c.pipeline.Do(req)
diff --git a/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations_test.go b/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations_test.go
index 0bd745b8efc..4506f9d5b1b 100644
--- a/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations_test.go
+++ b/cli/azd/extensions/azure.ai.agents/internal/pkg/agents/agent_api/operations_test.go
@@ -391,6 +391,7 @@ func TestSessionLifecycleOperations_ApplyIsolationHeaders(t *testing.T) {
 
 			require.NoError(t, tt.call(client, options))
 			require.Len(t, transport.requests, 1)
+			require.Equal(t, "HostedAgents=V1Preview", transport.requests[0].Header.Get("Foundry-Features"))
 			requireIsolationHeaders(t, transport.requests[0], "user-1", "chat-1", tt.wantSession)
 		})
 	}
@@ -555,6 +556,7 @@ func TestGetAgentSessionLogStream_ApplyIsolationHeaders(t *testing.T) {
 	}
 	require.NotNil(t, request)
 	require.Equal(t, "Bearer test-token", request.Header.Get("Authorization"))
+	require.Equal(t, "HostedAgents=V1Preview", request.Header.Get("Foundry-Features"))
 	requireIsolationHeaders(t, request, "user-1", "chat-1", "")
 }