fix: pass full elicitation schema in Go, add schema tests across SDKs

Go was only passing RequestedSchema.Properties to the elicitation
handler, dropping the 'type' and 'required' fields. This meant
handlers couldn't reconstruct the full JSON Schema. Now passes a
complete map with type, properties, and required.

Also replaces custom containsString/searchSubstring helpers in Go
tests with strings.Contains, and adds tests in Go and Python that
verify the full schema is passed through to elicitation handlers.

go/session.go

@@ -956,7 +956,13 @@ func (s *Session) handleBroadcastEvent(event SessionEvent) {
 		}
 		var requestedSchema map[string]any
 		if event.Data.RequestedSchema != nil {
-			requestedSchema = event.Data.RequestedSchema.Properties
+			requestedSchema = map[string]any{
+				"type":       string(event.Data.RequestedSchema.Type),
+				"properties": event.Data.RequestedSchema.Properties,
+			}
+			if len(event.Data.RequestedSchema.Required) > 0 {
+				requestedSchema["required"] = event.Data.RequestedSchema.Required
+			}
 		}
 		mode := ""
 		if event.Data.Mode != nil {

go/session_test.go

@@ -1,6 +1,7 @@
 package copilot
 
 import (
+	"strings"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -344,7 +345,7 @@ func TestSession_ElicitationCapabilityGating(t *testing.T) {
 			t.Fatal("Expected error when elicitation capability is missing")
 		}
 		expected := "elicitation is not supported"
-		if !containsString(err.Error(), expected) {
+		if !strings.Contains(err.Error(), expected) {
 			t.Errorf("Expected error to contain %q, got %q", expected, err.Error())
 		}
 	})
@@ -382,15 +383,60 @@ func TestSession_ElicitationHandler(t *testing.T) {
 	})
 }
 
-func containsString(s, substr string) bool {
-	return len(s) >= len(substr) && searchSubstring(s, substr)
-}
+func TestSession_ElicitationRequestSchema(t *testing.T) {
+	t.Run("elicitation.requested passes full schema to handler", func(t *testing.T) {
+		session, cleanup := newTestSession()
+		defer cleanup()
 
-func searchSubstring(s, substr string) bool {
-	for i := 0; i <= len(s)-len(substr); i++ {
-		if s[i:i+len(substr)] == substr {
-			return true
+		session.setCapabilities(&SessionCapabilities{
+			UI: &UICapabilities{Elicitation: true},
+		})
+
+		var receivedSchema map[string]any
+		session.registerElicitationHandler(func(req ElicitationRequest, inv ElicitationInvocation) (ElicitationResult, error) {
+			receivedSchema = req.RequestedSchema
+			return ElicitationResult{Action: "cancel"}, nil
+		})
+
+		// Build a synthetic elicitation.requested event with type, properties, and required
+		schemaType := RequestedSchemaType("object")
+		required := []string{"name", "age"}
+		event := SessionEvent{
+			Type: SessionEventTypeElicitationRequested,
+			Data: SessionEventData{
+				RequestID: String("req-1"),
+				Message:   String("Fill in your info"),
+				RequestedSchema: &RequestedSchema{
+					Type: schemaType,
+					Properties: map[string]any{
+						"name": map[string]any{"type": "string"},
+						"age":  map[string]any{"type": "number"},
+					},
+					Required: required,
+				},
+			},
 		}
-	}
-	return false
+
+		session.handleEvent(event)
+		// Give the event loop time to dispatch
+		time.Sleep(50 * time.Millisecond)
+
+		if receivedSchema == nil {
+			t.Fatal("Expected handler to receive schema, got nil")
+		}
+		if receivedSchema["type"] != "object" {
+			t.Errorf("Expected schema type 'object', got %v", receivedSchema["type"])
+		}
+		props, ok := receivedSchema["properties"].(map[string]any)
+		if !ok || props == nil {
+			t.Fatal("Expected schema properties map")
+		}
+		if len(props) != 2 {
+			t.Errorf("Expected 2 properties, got %d", len(props))
+		}
+		req, ok := receivedSchema["required"].([]string)
+		if !ok || len(req) != 2 {
+			t.Errorf("Expected required [name, age], got %v", receivedSchema["required"])
+		}
+	})
 }

python/test_commands_and_elicitation.py

@@ -546,6 +546,76 @@ async def mock_request(method, params):
         finally:
             await client.force_stop()
 
+    @pytest.mark.asyncio
+    async def test_elicitation_handler_receives_full_schema(self):
+        """Verifies that requestedSchema passes type, properties, and required to handler."""
+        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
+        await client.start()
+
+        try:
+            handler_calls: list = []
+
+            async def elicitation_handler(
+                request: ElicitationRequest, invocation: dict[str, str]
+            ) -> ElicitationResult:
+                handler_calls.append(request)
+                return {"action": "cancel"}
+
+            session = await client.create_session(
+                on_permission_request=PermissionHandler.approve_all,
+                on_elicitation_request=elicitation_handler,
+            )
+
+            original_request = client._client.request
+
+            async def mock_request(method, params):
+                if method == "session.ui.handlePendingElicitation":
+                    return {"success": True}
+                return await original_request(method, params)
+
+            client._client.request = mock_request
+
+            from copilot.generated.session_events import (
+                Data,
+                RequestedSchema,
+                RequestedSchemaType,
+                SessionEvent,
+                SessionEventType,
+            )
+
+            event = SessionEvent(
+                data=Data(
+                    request_id="req-schema-1",
+                    message="Fill in your details",
+                    requested_schema=RequestedSchema(
+                        type=RequestedSchemaType.OBJECT,
+                        properties={
+                            "name": {"type": "string"},
+                            "age": {"type": "number"},
+                        },
+                        required=["name", "age"],
+                    ),
+                ),
+                id="evt-schema-1",
+                timestamp="2025-01-01T00:00:00Z",
+                type=SessionEventType.ELICITATION_REQUESTED,
+                ephemeral=True,
+                parent_id=None,
+            )
+            session._dispatch_event(event)
+
+            await asyncio.sleep(0.2)
+
+            assert len(handler_calls) == 1
+            schema = handler_calls[0].get("requestedSchema")
+            assert schema is not None, "Expected requestedSchema in handler call"
+            assert schema["type"] == "object"
+            assert "name" in schema["properties"]
+            assert "age" in schema["properties"]
+            assert schema["required"] == ["name", "age"]
+        finally:
+            await client.force_stop()
+
 
 # ============================================================================
 # Capabilities changed event