feat: 将 Agents/Teams 工具纳入 Tool Search 按需发现

将 TeamCreate、TeamDelete、SendMessage 从 CORE_TOOLS 移除，
使其成为 deferred 工具，通过 ToolSearch 按需发现以减少 context token。
swarm 模式下 SendMessage 保持 always loaded，TeamCreate/TeamDelete
在 swarm 未启用时调用返回启用提示。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/builtin-tools/src/tools/TeamCreateTool/TeamCreateTool.ts

@@ -73,7 +73,8 @@ function generateUniqueTeamName(providedName: string): string {
 
 export const TeamCreateTool: Tool<InputSchema, Output> = buildTool({
   name: TEAM_CREATE_TOOL_NAME,
-  searchHint: 'create a multi-agent swarm team',
+  searchHint:
+    'create multi-agent swarm team, collaborate, parallel agents, task distribution, agent coordination, team management',
   maxResultSizeChars: 100_000,
   shouldDefer: true,
 
@@ -86,7 +87,7 @@ export const TeamCreateTool: Tool<InputSchema, Output> = buildTool({
   },
 
   isEnabled() {
-    return isAgentSwarmsEnabled()
+    return true
   },
 
   toAutoClassifierInput(input) {
@@ -126,6 +127,12 @@ export const TeamCreateTool: Tool<InputSchema, Output> = buildTool({
   },
 
   async call(input, context) {
+    if (!isAgentSwarmsEnabled()) {
+      throw new Error(
+        'Agent Teams 功能未启用。请确保未设置 CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS_DISABLED 环境变量。',
+      )
+    }
+
     const { setAppState, getAppState } = context
     const { team_name, description: _description, agent_type } = input