Unified command-tool registration via DewToolCommand mixin

- Add DewToolCommand mixin that auto-derives MCP tool JSON Schema from
  ArgParser, eliminating the need to define CLI commands and MCP tools
  separately
- Add schemaFromArgParser() to generate JSON Schema from ArgParser options
- Add CommandRegistry.mcpTools recursive collector for all DewToolCommand
  subcommands
- Refactor all kanban subcommands to use the mixin; switch get/update/delete
  from positional rest args to --id / -i option for schema compatibility
- Promote list to a proper CLI subcommand (was MCP-only before)
- Add search, comment, and config subcommands (CLI + MCP tools)
- Add TicketStore.addComment() for non-destructive comment appending
- Simplify mcp.registerCommands() to take only CommandRegistry
- Simplify CLI entry point (no more KanbanToolProvider/McpToolRegistry)
- Delete stale files: kanban_tool_provider.dart, mcp_tool_provider.dart,
  mcp_tool_registry.dart (superseded by DewToolCommand mixin)
- Add tools/mcp_client.dart debug client for manual MCP server testing
- Update .vscode/mcp.json with correct server config

All 26 tests pass, dart analyze clean.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

packages/cli/bin/dew.dart

@@ -5,12 +5,9 @@ import 'package:dew_mcp/dew_mcp.dart' as mcp;
 
 Future<void> main(List<String> args) async {
   final commandRegistry = CommandRegistry();
-  final toolRegistry = mcp.McpToolRegistry();
-
-  toolRegistry.register(kanban.KanbanToolProvider());
 
   kanban.registerCommands(commandRegistry);
-  mcp.registerCommands(commandRegistry, toolRegistry);
+  mcp.registerCommands(commandRegistry);
 
   final runner = CommandRunner<void>('dew', 'A project management tool.');
 

packages/core/lib/dew_core.dart

@@ -2,4 +2,3 @@ library;
 
 export 'src/config.dart';
 export 'src/dew_core_base.dart';
-export 'src/mcp_tool_provider.dart';

packages/core/lib/src/dew_core_base.dart

@@ -1,11 +1,134 @@
+import 'package:args/args.dart';
 import 'package:args/command_runner.dart';
 
+typedef McpToolHandler = Future<String> Function(Map<String, dynamic> args);
+
+/// A single tool exposed to an MCP client.
+class McpTool {
+  final String name;
+  final String description;
+
+  /// Raw JSON Schema object (type: object) describing the tool's parameters.
+  final Map<String, dynamic> inputSchema;
+
+  final McpToolHandler handler;
+
+  const McpTool({
+    required this.name,
+    required this.description,
+    required this.inputSchema,
+    required this.handler,
+  });
+}
+
+/// Implement this interface to expose tools to the MCP server without needing
+/// a CLI command (e.g. a background service or data source).
+abstract interface class McpToolProvider {
+  List<McpTool> get tools;
+}
+
+/// Derives a JSON Schema `object` from an [ArgParser]'s declared options.
+///
+/// Each option becomes a property:
+/// - flags → `boolean`
+/// - multi-options → `array` of strings (with `enum` if [Option.allowed] set)
+/// - options with [Option.allowed] → `string` with `enum`
+/// - all others → `string`
+///
+/// [Option.help] maps to `description`; [Option.mandatory] adds the name to
+/// `required`.
+Map<String, dynamic> schemaFromArgParser(ArgParser parser) {
+  final properties = <String, dynamic>{};
+  final required = <String>[];
+
+  for (final entry in parser.options.entries) {
+    final name = entry.key;
+    final option = entry.value;
+    if (name == 'help') continue;
+
+    final prop = <String, dynamic>{};
+
+    if (option.isFlag) {
+      prop['type'] = 'boolean';
+    } else if (option.isMultiple) {
+      prop['type'] = 'array';
+      prop['items'] = option.allowed != null && option.allowed!.isNotEmpty
+          ? {'type': 'string', 'enum': option.allowed}
+          : {'type': 'string'};
+    } else if (option.allowed != null && option.allowed!.isNotEmpty) {
+      prop['type'] = 'string';
+      prop['enum'] = option.allowed;
+    } else {
+      prop['type'] = 'string';
+    }
+
+    if (option.help != null && option.help!.isNotEmpty) {
+      prop['description'] = option.help;
+    }
+
+    properties[name] = prop;
+    if (option.mandatory) required.add(name);
+  }
+
+  return {
+    'type': 'object',
+    'properties': properties,
+    if (required.isNotEmpty) 'required': required,
+  };
+}
+
 /// Base class for all Dew CLI commands.
 ///
 /// Feature packages extend this class to provide their commands, then register
 /// them via [CommandRegistry] so the CLI can assemble them at startup.
 abstract class DewCommand extends Command<void> {}
 
+/// Mixin that makes a [DewCommand] also act as an MCP tool.
+///
+/// Commands only need to provide [toolName] and [callAsTool]. The mixin
+/// derives [toolInputSchema] from [ArgParser] automatically, and provides a
+/// default [run] implementation that delegates to [callAsTool].
+///
+/// Override [toolInputSchema] if the derived schema needs adjustment.
+mixin DewToolCommand on DewCommand {
+  /// The MCP tool name (e.g. `kanban_create_ticket`).
+  String get toolName;
+
+  /// JSON Schema for the tool's parameters.
+  /// Defaults to a schema derived from [argParser].
+  Map<String, dynamic> get toolInputSchema => schemaFromArgParser(argParser);
+
+  /// Executes the command logic given a plain [args] map.
+  ///
+  /// Returns a human-readable result string.
+  /// Both the default [run] and the MCP tool handler delegate here.
+  Future<String> callAsTool(Map<String, dynamic> args);
+
+  /// Builds a [McpTool] for this command.
+  McpTool toMcpTool() => McpTool(
+    name: toolName,
+    description: description,
+    inputSchema: toolInputSchema,
+    handler: callAsTool,
+  );
+
+  /// Default implementation: extracts named options from [argResults] and
+  /// delegates to [callAsTool], mapping [ArgumentError]s to [usageException].
+  @override
+  Future<void> run() async {
+    final args = <String, dynamic>{};
+    for (final name in argParser.options.keys) {
+      if (name == 'help') continue;
+      args[name] = argResults![name];
+    }
+    try {
+      print(await callAsTool(args));
+    } on ArgumentError catch (e) {
+      usageException(e.message as String? ?? e.toString());
+    }
+  }
+}
+
 /// Holds the [DewCommand]s registered by feature packages.
 ///
 /// The CLI creates an instance, passes it to each package's
@@ -19,4 +142,20 @@ class CommandRegistry {
 
   /// An unmodifiable view of all registered commands.
   List<DewCommand> get commands => List.unmodifiable(_commands);
+
+  /// Collects all [McpTool]s from commands that mix in [DewToolCommand],
+  /// recursively including subcommands.
+  List<McpTool> get mcpTools {
+    final tools = <McpTool>[];
+    void collect(Command<void> cmd) {
+      if (cmd is DewToolCommand) tools.add(cmd.toMcpTool());
+      for (final sub in cmd.subcommands.values) {
+        collect(sub);
+      }
+    }
+    for (final cmd in _commands) {
+      collect(cmd);
+    }
+    return tools;
+  }
 }

packages/core/lib/src/mcp_tool_provider.dart

@@ -1,27 +0,0 @@
-typedef McpToolHandler = Future<String> Function(Map<String, dynamic> args);
-
-/// A single tool exposed to an MCP client.
-class McpTool {
-  final String name;
-  final String description;
-
-  /// Raw JSON Schema object (type: object) describing the tool's parameters.
-  final Map<String, dynamic> inputSchema;
-
-  final McpToolHandler handler;
-
-  const McpTool({
-    required this.name,
-    required this.description,
-    required this.inputSchema,
-    required this.handler,
-  });
-}
-
-/// Implement this interface to expose tools to the MCP server.
-///
-/// Feature packages implement this in their own library without needing to
-/// depend on [packages/mcp] — they only depend on [packages/core].
-abstract interface class McpToolProvider {
-  List<McpTool> get tools;
-}

packages/kanban/lib/dew_kanban.dart

@@ -1,7 +1,6 @@
 library;
 
 export 'src/dew_kanban_base.dart';
-export 'src/kanban_tool_provider.dart';
 export 'src/ticket.dart';
 export 'src/ticket_store.dart';
 

packages/kanban/lib/src/commands/add_comment_command.dart

@@ -0,0 +1,35 @@
+import 'package:dew_core/dew_core.dart';
+import 'package:path/path.dart' as p;
+
+import '../ticket_store.dart';
+
+class AddCommentCommand extends DewCommand with DewToolCommand {
+  AddCommentCommand() {
+    argParser
+      ..addOption('id', abbr: 'i', mandatory: true, help: 'Ticket ID (e.g. DEW-0001).')
+      ..addOption('comment', abbr: 'm', mandatory: true, help: 'Comment text to append.');
+  }
+
+  @override
+  final String name = 'comment';
+
+  @override
+  final String description = 'Append a comment to a kanban ticket.';
+
+  @override
+  final String toolName = 'kanban_add_comment';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final id = (args['id'] as String).toUpperCase();
+    final comment = args['comment'] as String;
+
+    final context = await ProjectContext.find();
+    final store = TicketStore(
+      kanbanDir: p.join(context.root, '.project', 'kanban'),
+      prefix: context.config.kanban.prefix,
+    );
+    await store.addComment(id, comment);
+    return 'Comment added to $id.';
+  }
+}

packages/kanban/lib/src/commands/create_command.dart

@@ -3,7 +3,7 @@ import 'package:path/path.dart' as p;
 
 import '../ticket_store.dart';
 
-class CreateCommand extends DewCommand {
+class CreateCommand extends DewCommand with DewToolCommand {
   CreateCommand() {
     argParser
       ..addOption('title', abbr: 't', mandatory: true, help: 'Ticket title.')
@@ -27,27 +27,30 @@ class CreateCommand extends DewCommand {
   final String description = 'Create a new kanban ticket.';
 
   @override
-  Future<void> run() async {
+  final String toolName = 'kanban_create_ticket';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
     final context = await ProjectContext.find();
     final config = context.config.kanban;
 
-    final title = argResults!['title'] as String;
-    final typeId = argResults!['type'] as String;
-    final columnArg = argResults!['column'] as String?;
-    final body = argResults!['body'] as String? ?? '';
+    final title = args['title'] as String;
+    final typeId = args['type'] as String;
+    final columnArg = args['column'] as String?;
+    final body = args['body'] as String? ?? '';
 
     if (!config.ticketTypes.any((t) => t.id == typeId)) {
-      usageException(
+      throw ArgumentError(
         'Unknown type "$typeId". '
-        'Valid types: ${config.ticketTypes.map((t) => t.id).join(', ')}',
+        'Valid: ${config.ticketTypes.map((t) => t.id).join(', ')}',
       );
     }
 
     final column = columnArg ?? config.columns.first.id;
     if (!config.columns.any((c) => c.id == column)) {
-      usageException(
+      throw ArgumentError(
         'Unknown column "$column". '
-        'Valid columns: ${config.columns.map((c) => c.id).join(', ')}',
+        'Valid: ${config.columns.map((c) => c.id).join(', ')}',
       );
     }
 
@@ -55,14 +58,12 @@ class CreateCommand extends DewCommand {
       kanbanDir: p.join(context.root, '.project', 'kanban'),
       prefix: config.prefix,
     );
-
     final ticket = await store.create(
       title: title,
       type: typeId,
       column: column,
       body: body,
     );
-
-    print('Created ${ticket.id}.');
+    return 'Created ${ticket.id}: ${ticket.title}';
   }
 }

packages/kanban/lib/src/commands/delete_command.dart

@@ -3,7 +3,16 @@ import 'package:path/path.dart' as p;
 
 import '../ticket_store.dart';
 
-class DeleteCommand extends DewCommand {
+class DeleteCommand extends DewCommand with DewToolCommand {
+  DeleteCommand() {
+    argParser.addOption(
+      'id',
+      abbr: 'i',
+      mandatory: true,
+      help: 'Ticket ID (e.g. DEW-0001).',
+    );
+  }
+
   @override
   final String name = 'delete';
 
@@ -11,22 +20,17 @@ class DeleteCommand extends DewCommand {
   final String description = 'Delete a kanban ticket.';
 
   @override
-  Future<void> run() async {
-    final rest = argResults!.rest;
-    if (rest.isEmpty) usageException('Ticket ID is required.');
-    final id = rest.first.toUpperCase();
+  final String toolName = 'kanban_delete_ticket';
 
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final id = (args['id'] as String).toUpperCase();
     final context = await ProjectContext.find();
     final store = TicketStore(
       kanbanDir: p.join(context.root, '.project', 'kanban'),
       prefix: context.config.kanban.prefix,
     );
-
-    try {
     await store.delete(id);
-      print('Deleted $id.');
-    } on ArgumentError catch (e) {
-      usageException(e.message as String);
-    }
+    return 'Deleted $id.';
   }
 }

packages/kanban/lib/src/commands/get_command.dart

@@ -1,9 +1,19 @@
 import 'package:dew_core/dew_core.dart';
 import 'package:path/path.dart' as p;
 
+import '../ticket.dart';
 import '../ticket_store.dart';
 
-class GetCommand extends DewCommand {
+class GetCommand extends DewCommand with DewToolCommand {
+  GetCommand() {
+    argParser.addOption(
+      'id',
+      abbr: 'i',
+      mandatory: true,
+      help: 'Ticket ID (e.g. DEW-0001).',
+    );
+  }
+
   @override
   final String name = 'get';
 
@@ -11,32 +21,34 @@ class GetCommand extends DewCommand {
   final String description = 'Get a kanban ticket by ID.';
 
   @override
-  Future<void> run() async {
-    final rest = argResults!.rest;
-    if (rest.isEmpty) usageException('Ticket ID is required.');
-    final id = rest.first.toUpperCase();
+  final String toolName = 'kanban_get_ticket';
 
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final id = (args['id'] as String).toUpperCase();
     final context = await ProjectContext.find();
     final store = TicketStore(
       kanbanDir: p.join(context.root, '.project', 'kanban'),
       prefix: context.config.kanban.prefix,
     );
-
     final ticket = await store.findById(id);
-    if (ticket == null) usageException('Ticket $id not found.');
-
-    print('[${ticket.id}] (${ticket.type}) [${ticket.column}] ${ticket.title}');
-    print('Created: ${ticket.created.toLocal().toString().split('.').first}');
-
-    if (ticket.body.isNotEmpty) {
-      print('');
-      print(ticket.body);
+    if (ticket == null) throw ArgumentError('Ticket $id not found.');
+    return _format(ticket);
   }
 
-    for (final (i, comment) in ticket.comments.indexed) {
-      print('');
-      print('── Comment ${i + 1} ${'─' * 20}');
-      print(comment);
+  String _format(Ticket t) {
+    final buf = StringBuffer();
+    buf.writeln('[${t.id}] (${t.type}) [${t.column}] ${t.title}');
+    buf.writeln('Created: ${t.created.toLocal().toString().split('.').first}');
+    if (t.body.isNotEmpty) {
+      buf.writeln();
+      buf.writeln(t.body);
     }
+    for (final (i, comment) in t.comments.indexed) {
+      buf.writeln();
+      buf.writeln('── Comment ${i + 1} ${'─' * 20}');
+      buf.write(comment);
+    }
+    return buf.toString().trimRight();
   }
 }

packages/kanban/lib/src/commands/get_config_command.dart

@@ -0,0 +1,23 @@
+import 'package:dew_core/dew_core.dart';
+
+class GetConfigCommand extends DewCommand with DewToolCommand {
+  @override
+  final String name = 'config';
+
+  @override
+  final String description = 'Show the kanban configuration (columns and ticket types).';
+
+  @override
+  final String toolName = 'kanban_get_config';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final context = await ProjectContext.find();
+    final config = context.config.kanban;
+
+    final columns = config.columns.map((c) => '${c.id} (${c.name})').join(', ');
+    final types = config.ticketTypes.map((t) => '${t.id} (${t.name})').join(', ');
+
+    return 'Columns: $columns\nTypes: $types';
+  }
+}

packages/kanban/lib/src/commands/list_command.dart

@@ -0,0 +1,46 @@
+import 'package:dew_core/dew_core.dart';
+import 'package:path/path.dart' as p;
+
+import '../ticket_store.dart';
+
+class ListCommand extends DewCommand with DewToolCommand {
+  ListCommand() {
+    argParser
+      ..addOption('column', abbr: 'c', help: 'Filter to tickets in this column.')
+      ..addOption('type', abbr: 't', help: 'Filter to tickets of this type.');
+  }
+
+  @override
+  final String name = 'list';
+
+  @override
+  final String description = 'List kanban tickets, optionally filtered by column or type.';
+
+  @override
+  final String toolName = 'kanban_list_tickets';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final columnFilter = args['column'] as String?;
+    final typeFilter = args['type'] as String?;
+
+    final context = await ProjectContext.find();
+    final store = TicketStore(
+      kanbanDir: p.join(context.root, '.project', 'kanban'),
+      prefix: context.config.kanban.prefix,
+    );
+    var tickets = await store.list();
+
+    if (columnFilter != null) {
+      tickets = tickets.where((t) => t.column == columnFilter).toList();
+    }
+    if (typeFilter != null) {
+      tickets = tickets.where((t) => t.type == typeFilter).toList();
+    }
+
+    if (tickets.isEmpty) return 'No tickets found.';
+    return tickets
+        .map((t) => '[${t.id}] (${t.type}) [${t.column}] ${t.title}')
+        .join('\n');
+  }
+}

packages/kanban/lib/src/commands/search_command.dart

@@ -0,0 +1,59 @@
+import 'package:dew_core/dew_core.dart';
+import 'package:path/path.dart' as p;
+
+import '../ticket_store.dart';
+
+class SearchCommand extends DewCommand with DewToolCommand {
+  SearchCommand() {
+    argParser
+      ..addOption(
+        'query',
+        abbr: 'q',
+        mandatory: true,
+        help: 'Search query (matches title, body, and comments).',
+      )
+      ..addOption('column', abbr: 'c', help: 'Restrict search to this column.')
+      ..addOption('type', abbr: 't', help: 'Restrict search to this ticket type.');
+  }
+
+  @override
+  final String name = 'search';
+
+  @override
+  final String description = 'Search tickets by text across title, body, and comments.';
+
+  @override
+  final String toolName = 'kanban_search_tickets';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final query = (args['query'] as String).toLowerCase();
+    final columnFilter = args['column'] as String?;
+    final typeFilter = args['type'] as String?;
+
+    final context = await ProjectContext.find();
+    final store = TicketStore(
+      kanbanDir: p.join(context.root, '.project', 'kanban'),
+      prefix: context.config.kanban.prefix,
+    );
+    var tickets = await store.list();
+
+    if (columnFilter != null) {
+      tickets = tickets.where((t) => t.column == columnFilter).toList();
+    }
+    if (typeFilter != null) {
+      tickets = tickets.where((t) => t.type == typeFilter).toList();
+    }
+
+    final matches = tickets.where((t) {
+      return t.title.toLowerCase().contains(query) ||
+          t.body.toLowerCase().contains(query) ||
+          t.comments.any((c) => c.toLowerCase().contains(query));
+    }).toList();
+
+    if (matches.isEmpty) return 'No tickets found matching "$query".';
+    return matches
+        .map((t) => '[${t.id}] (${t.type}) [${t.column}] ${t.title}')
+        .join('\n');
+  }
+}

packages/kanban/lib/src/commands/update_command.dart

@@ -3,50 +3,50 @@ import 'package:path/path.dart' as p;
 
 import '../ticket_store.dart';
 
-class UpdateCommand extends DewCommand {
+class UpdateCommand extends DewCommand with DewToolCommand {
   UpdateCommand() {
     argParser
+      ..addOption('id', abbr: 'i', mandatory: true, help: 'Ticket ID.')
       ..addOption('title', abbr: 't', help: 'New title.')
       ..addOption('type', help: 'New ticket type.')
       ..addOption('column', abbr: 'c', help: 'New column.')
-      ..addOption('body', abbr: 'b', help: 'New body (replaces existing).');
+      ..addOption('body', abbr: 'b', help: 'New body (replaces existing body).');
   }
 
   @override
   final String name = 'update';
 
   @override
-  final String description = 'Update a kanban ticket.';
+  final String description = 'Update one or more fields on an existing kanban ticket.';
 
   @override
-  Future<void> run() async {
-    final rest = argResults!.rest;
-    if (rest.isEmpty) usageException('Ticket ID is required.');
-    final id = rest.first.toUpperCase();
+  final String toolName = 'kanban_update_ticket';
 
-    final title = argResults!['title'] as String?;
-    final typeId = argResults!['type'] as String?;
-    final column = argResults!['column'] as String?;
-    final body = argResults!['body'] as String?;
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final id = (args['id'] as String).toUpperCase();
+    final title = args['title'] as String?;
+    final typeId = args['type'] as String?;
+    final column = args['column'] as String?;
+    final body = args['body'] as String?;
 
     if (title == null && typeId == null && column == null && body == null) {
-      usageException('At least one option must be specified.');
+      throw ArgumentError('At least one of --title, --type, --column, --body must be specified.');
     }
 
     final context = await ProjectContext.find();
     final config = context.config.kanban;
 
     if (typeId != null && !config.ticketTypes.any((t) => t.id == typeId)) {
-      usageException(
+      throw ArgumentError(
         'Unknown type "$typeId". '
-        'Valid types: ${config.ticketTypes.map((t) => t.id).join(', ')}',
+        'Valid: ${config.ticketTypes.map((t) => t.id).join(', ')}',
       );
     }
-
     if (column != null && !config.columns.any((c) => c.id == column)) {
-      usageException(
+      throw ArgumentError(
         'Unknown column "$column". '
-        'Valid columns: ${config.columns.map((c) => c.id).join(', ')}',
+        'Valid: ${config.columns.map((c) => c.id).join(', ')}',
       );
     }
 
@@ -54,18 +54,7 @@ class UpdateCommand extends DewCommand {
       kanbanDir: p.join(context.root, '.project', 'kanban'),
       prefix: config.prefix,
     );
-
-    try {
-      final ticket = await store.update(
-        id,
-        title: title,
-        type: typeId,
-        column: column,
-        body: body,
-      );
-      print('Updated ${ticket.id}.');
-    } on ArgumentError catch (e) {
-      usageException(e.message as String);
-    }
+    final ticket = await store.update(id, title: title, type: typeId, column: column, body: body);
+    return 'Updated ${ticket.id}.';
   }
 }

packages/kanban/lib/src/dew_kanban_base.dart

@@ -1,17 +1,25 @@
 import 'package:dew_core/dew_core.dart';
 
+import 'commands/add_comment_command.dart';
 import 'commands/create_command.dart';
 import 'commands/delete_command.dart';
 import 'commands/get_command.dart';
+import 'commands/get_config_command.dart';
+import 'commands/list_command.dart';
+import 'commands/search_command.dart';
 import 'commands/update_command.dart';
 
 /// Top-level CLI command for all Kanban board operations.
 class KanbanCommand extends DewCommand {
   KanbanCommand() {
     addSubcommand(CreateCommand());
+    addSubcommand(ListCommand());
     addSubcommand(GetCommand());
     addSubcommand(UpdateCommand());
     addSubcommand(DeleteCommand());
+    addSubcommand(SearchCommand());
+    addSubcommand(AddCommentCommand());
+    addSubcommand(GetConfigCommand());
   }
 
   @override

packages/kanban/lib/src/kanban_tool_provider.dart

@@ -1,204 +0,0 @@
-import 'package:dew_core/dew_core.dart';
-import 'package:path/path.dart' as p;
-
-import 'ticket.dart';
-import 'ticket_store.dart';
-
-/// Exposes Kanban board operations as MCP tools.
-class KanbanToolProvider implements McpToolProvider {
-  @override
-  List<McpTool> get tools => [
-    McpTool(
-      name: 'kanban_create_ticket',
-      description: 'Create a new kanban ticket.',
-      inputSchema: {
-        'type': 'object',
-        'properties': {
-          'title': {'type': 'string', 'description': 'Ticket title.'},
-          'type': {
-            'type': 'string',
-            'description': 'Ticket type (e.g. task, bug).',
-          },
-          'column': {
-            'type': 'string',
-            'description':
-                'Initial column. Defaults to the first configured column.',
-          },
-          'body': {'type': 'string', 'description': 'Ticket description.'},
-        },
-        'required': ['title', 'type'],
-      },
-      handler: _createTicket,
-    ),
-    McpTool(
-      name: 'kanban_list_tickets',
-      description: 'List kanban tickets, optionally filtered by column or type.',
-      inputSchema: {
-        'type': 'object',
-        'properties': {
-          'column': {
-            'type': 'string',
-            'description': 'Filter to tickets in this column.',
-          },
-          'type': {
-            'type': 'string',
-            'description': 'Filter to tickets of this type.',
-          },
-        },
-      },
-      handler: _listTickets,
-    ),
-    McpTool(
-      name: 'kanban_get_ticket',
-      description: 'Get a kanban ticket by ID.',
-      inputSchema: {
-        'type': 'object',
-        'properties': {
-          'id': {
-            'type': 'string',
-            'description': 'Ticket ID (e.g. DEW-0001).',
-          },
-        },
-        'required': ['id'],
-      },
-      handler: _getTicket,
-    ),
-    McpTool(
-      name: 'kanban_update_ticket',
-      description: 'Update one or more fields on an existing kanban ticket.',
-      inputSchema: {
-        'type': 'object',
-        'properties': {
-          'id': {'type': 'string', 'description': 'Ticket ID.'},
-          'title': {'type': 'string', 'description': 'New title.'},
-          'type': {'type': 'string', 'description': 'New ticket type.'},
-          'column': {'type': 'string', 'description': 'New column.'},
-          'body': {
-            'type': 'string',
-            'description': 'New body (replaces existing body).',
-          },
-        },
-        'required': ['id'],
-      },
-      handler: _updateTicket,
-    ),
-    McpTool(
-      name: 'kanban_delete_ticket',
-      description: 'Delete a kanban ticket by ID.',
-      inputSchema: {
-        'type': 'object',
-        'properties': {
-          'id': {'type': 'string', 'description': 'Ticket ID.'},
-        },
-        'required': ['id'],
-      },
-      handler: _deleteTicket,
-    ),
-  ];
-
-  Future<TicketStore> _store() async {
-    final context = await ProjectContext.find();
-    return TicketStore(
-      kanbanDir: p.join(context.root, '.project', 'kanban'),
-      prefix: context.config.kanban.prefix,
-    );
-  }
-
-  Future<String> _createTicket(Map<String, dynamic> args) async {
-    final context = await ProjectContext.find();
-    final config = context.config.kanban;
-    final title = args['title'] as String;
-    final typeId = args['type'] as String;
-    final column = args['column'] as String? ?? config.columns.first.id;
-    final body = args['body'] as String? ?? '';
-
-    if (!config.ticketTypes.any((t) => t.id == typeId)) {
-      throw ArgumentError(
-        'Unknown type "$typeId". Valid: ${config.ticketTypes.map((t) => t.id).join(', ')}',
-      );
-    }
-    if (!config.columns.any((c) => c.id == column)) {
-      throw ArgumentError(
-        'Unknown column "$column". Valid: ${config.columns.map((c) => c.id).join(', ')}',
-      );
-    }
-
-    final store = TicketStore(
-      kanbanDir: p.join(context.root, '.project', 'kanban'),
-      prefix: config.prefix,
-    );
-    final ticket = await store.create(
-      title: title,
-      type: typeId,
-      column: column,
-      body: body,
-    );
-    return 'Created ${ticket.id}: ${ticket.title}';
-  }
-
-  Future<String> _listTickets(Map<String, dynamic> args) async {
-    final columnFilter = args['column'] as String?;
-    final typeFilter = args['type'] as String?;
-    final store = await _store();
-    var tickets = await store.list();
-
-    if (columnFilter != null) {
-      tickets = tickets.where((t) => t.column == columnFilter).toList();
-    }
-    if (typeFilter != null) {
-      tickets = tickets.where((t) => t.type == typeFilter).toList();
-    }
-
-    if (tickets.isEmpty) return 'No tickets found.';
-
-    return tickets
-        .map((t) => '[${t.id}] (${t.type}) [${t.column}] ${t.title}')
-        .join('\n');
-  }
-
-  Future<String> _getTicket(Map<String, dynamic> args) async {
-    final id = (args['id'] as String).toUpperCase();
-    final store = await _store();
-    final ticket = await store.findById(id);
-    if (ticket == null) throw ArgumentError('Ticket $id not found.');
-    return _formatTicket(ticket);
-  }
-
-  Future<String> _updateTicket(Map<String, dynamic> args) async {
-    final id = (args['id'] as String).toUpperCase();
-    final store = await _store();
-    final updated = await store.update(
-      id,
-      title: args['title'] as String?,
-      type: args['type'] as String?,
-      column: args['column'] as String?,
-      body: args['body'] as String?,
-    );
-    return 'Updated ${updated.id}.\n${_formatTicket(updated)}';
-  }
-
-  Future<String> _deleteTicket(Map<String, dynamic> args) async {
-    final id = (args['id'] as String).toUpperCase();
-    final store = await _store();
-    await store.delete(id);
-    return 'Deleted $id.';
-  }
-
-  String _formatTicket(Ticket t) {
-    final buf = StringBuffer();
-    buf.writeln('[${t.id}] (${t.type}) [${t.column}] ${t.title}');
-    buf.writeln(
-      'Created: ${t.created.toLocal().toString().split('.').first}',
-    );
-    if (t.body.isNotEmpty) {
-      buf.writeln();
-      buf.writeln(t.body);
-    }
-    for (final (i, comment) in t.comments.indexed) {
-      buf.writeln();
-      buf.writeln('── Comment ${i + 1} ${'─' * 20}');
-      buf.write(comment);
-    }
-    return buf.toString().trimRight();
-  }
-}

packages/kanban/lib/src/ticket_store.dart

@@ -54,6 +54,16 @@ class TicketStore {
     return tickets;
   }
 
+  Future<Ticket> addComment(String id, String comment) async {
+    final ticket = await findById(id);
+    if (ticket == null) throw ArgumentError('Ticket $id not found.');
+    final updated = ticket.copyWith(
+      comments: [...ticket.comments, comment],
+    );
+    await File(_filePath(id)).writeAsString(updated.toFileContent());
+    return updated;
+  }
+
   Future<Ticket> update(
     String id, {
     String? title,

packages/kanban/test/dew_kanban_test.dart

@@ -17,7 +17,7 @@ void main() {
       final cmd = KanbanCommand();
       expect(
         cmd.subcommands.keys,
-        containsAll(['create', 'get', 'update', 'delete']),
+        containsAll(['create', 'list', 'get', 'update', 'delete', 'search', 'comment', 'config']),
       );
     });
 
@@ -28,6 +28,94 @@ void main() {
     });
   });
 
+  group('CommandRegistry.mcpTools via kanban', () {
+    test('exposes eight tools with unique names', () {
+      final registry = CommandRegistry();
+      registerCommands(registry);
+      final tools = registry.mcpTools;
+      expect(tools, hasLength(8));
+      final names = tools.map((t) => t.name).toSet();
+      expect(names, {
+        'kanban_create_ticket',
+        'kanban_list_tickets',
+        'kanban_get_ticket',
+        'kanban_update_ticket',
+        'kanban_delete_ticket',
+        'kanban_search_tickets',
+        'kanban_add_comment',
+        'kanban_get_config',
+      });
+    });
+
+    test('all tools have non-empty descriptions and object inputSchema', () {
+      final registry = CommandRegistry();
+      registerCommands(registry);
+      for (final tool in registry.mcpTools) {
+        expect(tool.description, isNotEmpty, reason: '${tool.name} description');
+        expect(tool.inputSchema['type'], 'object', reason: '${tool.name} schema type');
+      }
+    });
+
+    test('schema derived from argParser — create tool has required fields', () {
+      final registry = CommandRegistry();
+      registerCommands(registry);
+      final create = registry.mcpTools.firstWhere((t) => t.name == 'kanban_create_ticket');
+      final required = create.inputSchema['required'] as List;
+      expect(required, containsAll(['title', 'type']));
+    });
+
+    test('create and list tools have working handlers', () async {
+      final tempDir = await Directory.systemTemp.createTemp('kanban_tool_test_');
+      final origDir = Directory.current;
+      try {
+        await Directory(p.join(tempDir.path, '.project', 'kanban')).create(recursive: true);
+        await File(p.join(tempDir.path, '.project', 'dew.yaml')).writeAsString('''
+dew:
+  mcp:
+    host: localhost
+    port: 9090
+  kanban:
+    prefix: T
+    ticket_types:
+      - id: task
+        name: Task
+    columns:
+      - id: todo
+        name: To Do
+        color: blue
+''');
+        Directory.current = tempDir;
+        final registry = CommandRegistry();
+        registerCommands(registry);
+        final tools = {for (final t in registry.mcpTools) t.name: t};
+
+        final result = await tools['kanban_create_ticket']!.handler({
+          'title': 'Hello',
+          'type': 'task',
+        });
+        expect(result, contains('T-0001'));
+
+        final listResult = await tools['kanban_list_tickets']!.handler({});
+        expect(listResult, contains('T-0001'));
+
+        final searchResult = await tools['kanban_search_tickets']!.handler({'query': 'Hello'});
+        expect(searchResult, contains('T-0001'));
+
+        await tools['kanban_add_comment']!.handler({'id': 'T-0001', 'comment': 'Nice ticket.'});
+
+        final getResult = await tools['kanban_get_ticket']!.handler({'id': 'T-0001'});
+        expect(getResult, contains('Nice ticket.'));
+
+        final configResult = await tools['kanban_get_config']!.handler({});
+        expect(configResult, contains('todo'));
+        expect(configResult, contains('task'));
+      } finally {
+        Directory.current = origDir;
+        await tempDir.delete(recursive: true);
+      }
+    });
+  });
+
   group('Ticket', () {
     test('roundtrip serialisation', () {
       final t = Ticket(
@@ -140,72 +228,6 @@ void main() {
     });
   });
 
-  group('KanbanToolProvider', () {
-    test('exposes five tools with unique names', () {
-      final provider = KanbanToolProvider();
-      expect(provider.tools, hasLength(5));
-      final names = provider.tools.map((t) => t.name).toSet();
-      expect(names, {
-        'kanban_create_ticket',
-        'kanban_list_tickets',
-        'kanban_get_ticket',
-        'kanban_update_ticket',
-        'kanban_delete_ticket',
-      });
-    });
-
-    test('all tools have non-empty descriptions and object inputSchema', () {
-      for (final tool in KanbanToolProvider().tools) {
-        expect(tool.description, isNotEmpty, reason: '${tool.name} description');
-        expect(tool.inputSchema['type'], 'object',
-            reason: '${tool.name} schema type');
-      }
-    });
-
-    test('create and list tools have handlers that work', () async {
-      // Use a real temp dir with a fake dew.yaml so ProjectContext.find()
-      // resolves — handlers call ProjectContext.find() internally.
-      final tempDir = await Directory.systemTemp.createTemp('kanban_tool_test_');
-      final origDir = Directory.current;
-      try {
-        await Directory(p.join(tempDir.path, '.project', 'kanban')).create(recursive: true);
-        await File(p.join(tempDir.path, '.project', 'dew.yaml')).writeAsString('''
-dew:
-  mcp:
-    host: localhost
-    port: 9090
-  kanban:
-    prefix: T
-    ticket_types:
-      - id: task
-        name: Task
-    columns:
-      - id: todo
-        name: To Do
-        color: blue
-''');
-        Directory.current = tempDir;
-        final provider = KanbanToolProvider();
-
-        final createTool = provider.tools.firstWhere(
-          (t) => t.name == 'kanban_create_ticket',
-        );
-        final result = await createTool.handler({
-          'title': 'Hello',
-          'type': 'task',
-        });
-        expect(result, contains('T-0001'));
-
-        final listTool = provider.tools.firstWhere(
-          (t) => t.name == 'kanban_list_tickets',
-        );
-        final listResult = await listTool.handler({});
-        expect(listResult, contains('T-0001'));
-      } finally {
-        Directory.current = origDir;
-        await tempDir.delete(recursive: true);
-      }
-    });
-  });
 }
 
+

packages/mcp/lib/dew_mcp.dart

@@ -1,19 +1,15 @@
 library;
 
 export 'src/dew_mcp_base.dart';
-export 'src/mcp_tool_registry.dart';
 
 import 'package:dew_core/dew_core.dart';
 import 'package:dew_mcp/src/dew_mcp_base.dart';
-import 'package:dew_mcp/src/mcp_tool_registry.dart';
 
 /// Registers the MCP command into [commandRegistry].
 ///
-/// [toolRegistry] is passed to [McpCommand] so the `serve` subcommand can
-/// start the server with all registered tool providers.
-void registerCommands(
-  CommandRegistry commandRegistry,
-  McpToolRegistry toolRegistry,
-) {
-  commandRegistry.register(McpCommand(toolRegistry));
+/// Tools are resolved lazily from [commandRegistry.mcpTools] when the server
+/// starts, so all feature packages must call their own [registerCommands]
+/// before this is invoked.
+void registerCommands(CommandRegistry commandRegistry) {
+  commandRegistry.register(McpCommand(commandRegistry));
 }

packages/mcp/lib/src/commands/serve_command.dart

@@ -4,12 +4,11 @@ import 'package:dart_mcp/stdio.dart';
 import 'package:dew_core/dew_core.dart';
 
 import '../dew_mcp_server.dart';
-import '../mcp_tool_registry.dart';
 
 class ServeCommand extends DewCommand {
-  final McpToolRegistry _toolRegistry;
+  final CommandRegistry _commandRegistry;
 
-  ServeCommand(this._toolRegistry);
+  ServeCommand(this._commandRegistry);
 
   @override
   final String name = 'serve';
@@ -21,7 +20,8 @@ class ServeCommand extends DewCommand {
 
   @override
   Future<void> run() async {
-    final tools = _toolRegistry.allTools;
+    // Resolve tools at serve time so all feature packages are already registered.
+    final tools = _commandRegistry.mcpTools;
 
     io.stderr.writeln(
       'Dew MCP server starting — ${tools.length} tool(s) registered.',

packages/mcp/lib/src/dew_mcp_base.dart

@@ -1,12 +1,11 @@
 import 'package:dew_core/dew_core.dart';
 
 import 'commands/serve_command.dart';
-import 'mcp_tool_registry.dart';
 
 /// Top-level CLI command for MCP server operations.
 class McpCommand extends DewCommand {
-  McpCommand(McpToolRegistry toolRegistry) {
-    addSubcommand(ServeCommand(toolRegistry));
+  McpCommand(CommandRegistry commandRegistry) {
+    addSubcommand(ServeCommand(commandRegistry));
   }
 
   @override

packages/mcp/lib/src/mcp_tool_registry.dart

@@ -1,13 +0,0 @@
-import 'package:dew_core/dew_core.dart';
-
-/// Collects [McpToolProvider] instances and exposes their combined tool list.
-class McpToolRegistry {
-  final List<McpToolProvider> _providers = [];
-
-  /// Adds [provider] to the registry.
-  void register(McpToolProvider provider) => _providers.add(provider);
-
-  /// All tools from every registered provider, in registration order.
-  List<McpTool> get allTools =>
-      List.unmodifiable(_providers.expand((p) => p.tools));
-}

packages/mcp/test/mcp_test.dart

@@ -2,56 +2,66 @@ import 'package:dew_core/dew_core.dart';
 import 'package:dew_mcp/dew_mcp.dart';
 import 'package:test/test.dart';
 
-class _PingProvider implements McpToolProvider {
-  @override
-  List<McpTool> get tools => [
-    McpTool(
-      name: 'ping',
-      description: 'Returns pong.',
-      inputSchema: {'type': 'object', 'properties': {}},
-      handler: (_) async => 'pong',
-    ),
-  ];
-}
-
 void main() {
   group('McpCommand', () {
     test('has correct name and description', () {
-      final cmd = McpCommand(McpToolRegistry());
+      final cmd = McpCommand(CommandRegistry());
       expect(cmd.name, 'mcp');
       expect(cmd.description, isNotEmpty);
     });
 
     test('has serve subcommand', () {
-      final cmd = McpCommand(McpToolRegistry());
+      final cmd = McpCommand(CommandRegistry());
       expect(cmd.subcommands.keys, contains('serve'));
     });
 
     test('registerCommands adds mcp command to registry', () {
-      final commandRegistry = CommandRegistry();
-      registerCommands(commandRegistry, McpToolRegistry());
-      expect(commandRegistry.commands.map((c) => c.name), contains('mcp'));
+      final registry = CommandRegistry();
+      registerCommands(registry);
+      expect(registry.commands.map((c) => c.name), contains('mcp'));
     });
   });
 
-  group('McpToolRegistry', () {
-    test('starts empty', () {
-      expect(McpToolRegistry().allTools, isEmpty);
+  group('CommandRegistry.mcpTools', () {
+    test('starts empty with no feature packages registered', () {
+      expect(CommandRegistry().mcpTools, isEmpty);
     });
 
-    test('register adds provider tools', () {
-      final registry = McpToolRegistry();
-      registry.register(_PingProvider());
-      expect(registry.allTools, hasLength(1));
-      expect(registry.allTools.first.name, 'ping');
-    });
-
-    test('aggregates tools from multiple providers', () {
-      final registry = McpToolRegistry();
-      registry.register(_PingProvider());
-      registry.register(_PingProvider());
-      expect(registry.allTools, hasLength(2));
+    test('collects tools from DewToolCommand subcommands', () {
+      final registry = CommandRegistry();
+      registry.register(_StubParentCommand());
+      expect(registry.mcpTools, hasLength(1));
+      expect(registry.mcpTools.first.name, 'stub_tool');
     });
   });
 }
 
+class _StubToolCommand extends DewCommand with DewToolCommand {
+  _StubToolCommand() {
+    argParser.addOption('input', mandatory: true, help: 'Some input.');
+  }
+
+  @override
+  final String name = 'stub';
+  @override
+  final String description = 'A stub tool command.';
+  @override
+  final String toolName = 'stub_tool';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async => 'ok';
+}
+
+class _StubParentCommand extends DewCommand {
+  _StubParentCommand() {
+    addSubcommand(_StubToolCommand());
+  }
+
+  @override
+  final String name = 'parent';
+  @override
+  final String description = 'Parent.';
+  @override
+  Future<void> run() async => printUsage();
+}
+

tools/mcp_client.dart

@@ -81,7 +81,7 @@ void main(List<String> args) async {
     exit(1);
   }
 
-  print('Server: ${initResult.serverInfo?.name} ${initResult.serverInfo?.version}');
+  print('Server: ${initResult.serverInfo.name} ${initResult.serverInfo.version}');
   print('Protocol: ${initResult.protocolVersion}');
   print('');