webui: Agentic Loop + MCP Client with support for Tools, Resources and Prompts (#18655)

tools/server/webui/src/lib/enums/agentic.ts

@@ -0,0 +1,18 @@
+/**
+ * OpenAI-compatible tool call type.
+ */
+export enum ToolCallType {
+	FUNCTION = 'function'
+}
+
+/**
+ * Types of sections in agentic content display.
+ */
+export enum AgenticSectionType {
+	TEXT = 'text',
+	TOOL_CALL = 'tool_call',
+	TOOL_CALL_PENDING = 'tool_call_pending',
+	TOOL_CALL_STREAMING = 'tool_call_streaming',
+	REASONING = 'reasoning',
+	REASONING_PENDING = 'reasoning_pending'
+}

tools/server/webui/src/lib/enums/attachment.ts

@@ -4,6 +4,8 @@
 export enum AttachmentType {
 	AUDIO = 'AUDIO',
 	IMAGE = 'IMAGE',
+	MCP_PROMPT = 'MCP_PROMPT',
+	MCP_RESOURCE = 'MCP_RESOURCE',
 	PDF = 'PDF',
 	TEXT = 'TEXT',
 	LEGACY_CONTEXT = 'context' // Legacy attachment type for backward compatibility

tools/server/webui/src/lib/enums/files.ts

@@ -11,6 +11,13 @@ export enum FileTypeCategory {
 	TEXT = 'text'
 }
 
+/**
+ * Special file types for internal use (not MIME types)
+ */
+export enum SpecialFileType {
+	MCP_PROMPT = 'mcp-prompt'
+}
+
 // Specific file type enums for each category
 export enum FileTypeImage {
 	JPEG = 'jpeg',

tools/server/webui/src/lib/enums/index.ts

@@ -1,5 +1,7 @@
 export { AttachmentType } from './attachment';
 
+export { AgenticSectionType, ToolCallType } from './agentic';
+
 export {
 	ChatMessageStatsView,
 	ContentPartType,
@@ -25,15 +27,26 @@ export {
 	MimeTypeApplication,
 	MimeTypeAudio,
 	MimeTypeImage,
-	MimeTypeText
+	MimeTypeText,
+	SpecialFileType
 } from './files';
 
+export {
+	MCPConnectionPhase,
+	MCPLogLevel,
+	MCPTransportType,
+	HealthCheckStatus,
+	MCPContentType,
+	MCPRefType,
+	JsonSchemaType
+} from './mcp';
+
 export { ModelModality } from './model';
 
 export { ServerRole, ServerModelStatus } from './server';
 
 export { ParameterSource, SyncableParameterType, SettingsFieldType } from './settings';
 
-export { ColorMode, UrlPrefix } from './ui';
+export { ColorMode, McpPromptVariant, UrlProtocol } from './ui';
 
 export { KeyboardKey } from './keyboard';

tools/server/webui/src/lib/enums/mcp.ts

@@ -0,0 +1,66 @@
+/**
+ * Connection lifecycle phases for MCP protocol
+ */
+export enum MCPConnectionPhase {
+	IDLE = 'idle',
+	TRANSPORT_CREATING = 'transport_creating',
+	TRANSPORT_READY = 'transport_ready',
+	INITIALIZING = 'initializing',
+	CAPABILITIES_EXCHANGED = 'capabilities_exchanged',
+	LISTING_TOOLS = 'listing_tools',
+	CONNECTED = 'connected',
+	ERROR = 'error',
+	DISCONNECTED = 'disconnected'
+}
+
+/**
+ * Log level for connection events
+ */
+export enum MCPLogLevel {
+	INFO = 'info',
+	WARN = 'warn',
+	ERROR = 'error'
+}
+
+/**
+ * Transport types for MCP connections
+ */
+export enum MCPTransportType {
+	WEBSOCKET = 'websocket',
+	STREAMABLE_HTTP = 'streamable_http',
+	SSE = 'sse'
+}
+
+/**
+ * Health check status for MCP servers
+ */
+export enum HealthCheckStatus {
+	IDLE = 'idle',
+	CONNECTING = 'connecting',
+	SUCCESS = 'success',
+	ERROR = 'error'
+}
+
+/**
+ * Content types for MCP tool results
+ */
+export enum MCPContentType {
+	TEXT = 'text',
+	IMAGE = 'image',
+	RESOURCE = 'resource'
+}
+
+/**
+ * JSON Schema types used in MCP tool definitions
+ */
+export enum JsonSchemaType {
+	OBJECT = 'object'
+}
+
+/**
+ * Reference types for MCP completions
+ */
+export enum MCPRefType {
+	PROMPT = 'ref/prompt',
+	RESOURCE = 'ref/resource'
+}

tools/server/webui/src/lib/enums/ui.ts

@@ -4,10 +4,18 @@ export enum ColorMode {
 	SYSTEM = 'system'
 }
 
+/**
+ * MCP prompt display variant
+ */
+export enum McpPromptVariant {
+	MESSAGE = 'message',
+	ATTACHMENT = 'attachment'
+}
+
 /**
  * URL prefixes for protocol detection
  */
-export enum UrlPrefix {
+export enum UrlProtocol {
 	DATA = 'data:',
 	HTTP = 'http://',
 	HTTPS = 'https://',