[BUG] ExitPlanMode doesn't return the plan as a tool result in v2.0.51 #12288
Description
Preflight Checklist
- I have searched existing issues and this hasn't been reported yet
- This is a single bug report (please file separate reports for different bugs)
- I am using the latest version of Claude Code
What's Wrong?
When asking Claude to make a plan using the Claude Agent SDK, the ExitPlanMode tool_use block has an empty input field.
This effectively means that Claude Code is not returning the plan to the user. Previously, the plan that Claude generated would be in this input field with format input: {"plan": "<some-plan-here>"}.
What Should Happen?
The Claude Agent SDK should return an input block with the resulting plan.
Error Messages/Logs
Full SDK logs:
[2025-11-24T20:54:44.020Z] {
"type": "assistant",
"message": {
"model": "claude-opus-4-5-20251101",
"id": "msg_017e2j7Cgo6nPveSEXPFi49B",
"type": "message",
"role": "assistant",
"content": [
{
"type": "tool_use",
"id": "toolu_01DZVSfTvie8owEVhnS4EP7Y",
"name": "ExitPlanMode",
"input": {}
}
],
"stop_reason": null,
"stop_sequence": null,
"usage": {
"input_tokens": 1,
"cache_creation_input_tokens": 1108,
"cache_read_input_tokens": 20452,
"cache_creation": {
"ephemeral_5m_input_tokens": 1108,
"ephemeral_1h_input_tokens": 0
},
"output_tokens": 1,
"service_tier": "standard"
},
"context_management": null
},
"parent_tool_use_id": null,
"session_id": "b1eb90ac-9c78-4e64-8574-97a4929ca4e1",
"uuid": "3f192f9f-7518-4eb1-8758-9bb1d86c517b"
}
[2025-11-24T20:54:44.048Z] [CC-SDK-STDERR]: 2025-11-24T20:54:44.048Z [ERROR] "ZodError: ZodError\n at error (/$bunfs/root/claude:77:18464)\n at parse (/$bunfs/root/claude:77:11726)\n at w67 (/$bunfs/root/claude:4010:4667)\n at async <anonymous> (/$bunfs/root/claude:4010:6182)\n at async <anonymous> (/$bunfs/root/claude:4432:680)\n at async <anonymous> (/$bunfs/root/claude:4435:1537)\n at async Jt8 (/$bunfs/root/claude:2149:23658)\n at processTicksAndRejections (native:7:39)"
[2025-11-24T20:54:44.048Z] [canUseTool] ExitPlanMode detected for session d638be6a-54ee-4483-b6a9-c931b30364cfSteps to Reproduce
- Ask Claude Code to make a plan using the SDK with
permissionMode: "plan" - Notice that the
tool_useblock withnameset toExitPlanModewill have an emptyinputfield
Claude Model
None
Is this a regression?
Yes, this worked in a previous version
Last Working Version
2.0.34
Claude Code Version
2.0.51
Platform
Anthropic API
Operating System
macOS
Terminal/Shell
Non-interactive/CI environment
Additional Information
The last version we tested on was v2.0.34. We have not bisected versions further than that.