diff --git a/packages/cli/src/zed-integration/zedIntegration.ts b/packages/cli/src/zed-integration/zedIntegration.ts
index d4f1b27b92..e89a884ab5 100644
--- a/packages/cli/src/zed-integration/zedIntegration.ts
+++ b/packages/cli/src/zed-integration/zedIntegration.ts
@@ -1335,6 +1335,8 @@ function toAcpToolKind(kind: Kind): acp.ToolKind {
     case Kind.SwitchMode:
     case Kind.Other:
       return kind as acp.ToolKind;
+    case Kind.Agent:
+      return 'think';
     case Kind.Plan:
     case Kind.Communicate:
     default:
diff --git a/packages/core/src/agents/subagent-tool-wrapper.test.ts b/packages/core/src/agents/subagent-tool-wrapper.test.ts
index c4f3d178c9..e433e6f7d3 100644
--- a/packages/core/src/agents/subagent-tool-wrapper.test.ts
+++ b/packages/core/src/agents/subagent-tool-wrapper.test.ts
@@ -70,7 +70,7 @@ describe('SubagentToolWrapper', () => {
       expect(wrapper.name).toBe(mockDefinition.name);
       expect(wrapper.displayName).toBe(mockDefinition.displayName);
       expect(wrapper.description).toBe(mockDefinition.description);
-      expect(wrapper.kind).toBe(Kind.Think);
+      expect(wrapper.kind).toBe(Kind.Agent);
       expect(wrapper.isOutputMarkdown).toBe(true);
       expect(wrapper.canUpdateOutput).toBe(true);
     });
diff --git a/packages/core/src/agents/subagent-tool-wrapper.ts b/packages/core/src/agents/subagent-tool-wrapper.ts
index 57ee929205..d0e94f1b4b 100644
--- a/packages/core/src/agents/subagent-tool-wrapper.ts
+++ b/packages/core/src/agents/subagent-tool-wrapper.ts
@@ -45,7 +45,7 @@ export class SubagentToolWrapper extends BaseDeclarativeTool<
       definition.name,
       definition.displayName ?? definition.name,
       definition.description,
-      Kind.Think,
+      Kind.Agent,
       definition.inputConfig.inputSchema,
       messageBus,
       /* isOutputMarkdown */ true,
diff --git a/packages/core/src/agents/subagent-tool.test.ts b/packages/core/src/agents/subagent-tool.test.ts
index d6d6bdfd89..40db4822a2 100644
--- a/packages/core/src/agents/subagent-tool.test.ts
+++ b/packages/core/src/agents/subagent-tool.test.ts
@@ -7,6 +7,7 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { SubagentTool } from './subagent-tool.js';
 import { SubagentToolWrapper } from './subagent-tool-wrapper.js';
+import { Kind } from '../tools/tools.js';
 import type {
   LocalAgentDefinition,
   RemoteAgentDefinition,
@@ -70,6 +71,11 @@ describe('SubAgentInvocation', () => {
       .mockReturnValue(mockInnerInvocation);
   });
 
+  it('should have Kind.Agent', () => {
+    const tool = new SubagentTool(testDefinition, mockConfig, mockMessageBus);
+    expect(tool.kind).toBe(Kind.Agent);
+  });
+
   it('should delegate shouldConfirmExecute to the inner sub-invocation (local)', async () => {
     const tool = new SubagentTool(testDefinition, mockConfig, mockMessageBus);
     const params = {};
diff --git a/packages/core/src/agents/subagent-tool.ts b/packages/core/src/agents/subagent-tool.ts
index f47b506634..8584ae97f1 100644
--- a/packages/core/src/agents/subagent-tool.ts
+++ b/packages/core/src/agents/subagent-tool.ts
@@ -41,7 +41,7 @@ export class SubagentTool extends BaseDeclarativeTool<AgentInputs, ToolResult> {
       definition.name,
       definition.displayName ?? definition.name,
       definition.description,
-      Kind.Think,
+      Kind.Agent,
       inputSchema,
       messageBus,
       /* isOutputMarkdown */ true,
diff --git a/packages/core/src/tools/tools.ts b/packages/core/src/tools/tools.ts
index d847b596e0..3c024168d4 100644
--- a/packages/core/src/tools/tools.ts
+++ b/packages/core/src/tools/tools.ts
@@ -832,6 +832,7 @@ export enum Kind {
   Search = 'search',
   Execute = 'execute',
   Think = 'think',
+  Agent = 'agent',
   Fetch = 'fetch',
   Communicate = 'communicate',
   Plan = 'plan',