An error seems caused by the ✨ emoji.

What version of Kimi Code CLI is running?

kimi, version 1.44.0

Which open platform/subscription were you using?

submit request

Which model were you using?

kimi-for-coding

What platform is your computer?

Linux 7.0.5-1.0.8.sr20260504-default x86_64 x86_64

What issue are you seeing?

Python raised an error.

What steps can reproduce the bug?

Just text hello and enter to submit the request.

What is the expected behavior?

╭────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ │
│ ▐█▛█▛█▌ Welcome to Kimi Code CLI! │
│ ▐█████▌ Send /help for help information. │
│ │
│ Directory: ~ │
│ Session: 791f5362-d0a6-434d-8607-6f024e1de7c9 │
│ Model: Kimi-k2.6 │
│ │
│ Tip: Spot a bug or have feedback? Type /feedback right in this session — every report makes Kimi better. │
│ │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
✨ hello

Unexpected error: 'utf-8' codec can't encode character '\udca9' in position 9763: surrogates not allowed
Run kimi export and send the exported data to support for assistance. Please do not share the exported file publicly.

To resume this session: kimi -r 791f5362-d0a6-434d-8607-6f024e1de7c9
Traceback (most recent call last):
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/cli/init.py", line 849, in kimi
switch_target, exit_code = asyncio.run(_reload_loop(session_id))
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/miniconda3/lib/python3.13/asyncio/runners.py", line 195, in run
return runner.run(main)
~~~~~~~~~~^^^^^^
File "/home/sym/miniconda3/lib/python3.13/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/home/sym/miniconda3/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
return future.result()
~~~~~~~~~~~~~^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/cli/init.py", line 764, in _reload_loop
last_session, exit_code = await _run(session_id, prefill_text=prefill_text)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/cli/init.py", line 660, in _run
shell_ok = await instance.run_shell(prompt, prefill_text=prefill_text)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/app.py", line 770, in run_shell
return await shell.run(command)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/ui/shell/init.py", line 680, in run
await self.run_soul_command(user_input.content)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/ui/shell/init.py", line 859, in run_soul_command
await run_soul(
...<23 lines>...
)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/init.py", line 233, in run_soul
soul_task.result() # this will raise if any exception was raised in the run task
~~~~~~~~~~~~~~~~^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 652, in run
await self._turn(user_message)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 729, in _turn
return await self._agent_loop()
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 917, in _agent_loop
step_outcome = await self._step()
^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 1119, in _step
result = await _kosong_step_with_retry()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/asyncio/init.py", line 189, in async_wrapped
return await copy(fn, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/asyncio/init.py", line 111, in call
do = await self.iter(retry_state=retry_state)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/asyncio/init.py", line 153, in iter
result = await action(retry_state)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/_utils.py", line 99, in inner
return call(*args, **kwargs)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/init.py", line 400, in
self._add_action_func(lambda rs: rs.outcome.result())
~~~~~~~~~~~~~~~~~^^
File "/home/sym/miniconda3/lib/python3.13/concurrent/futures/_base.py", line 449, in result
return self.__get_result()
~~~~~~~~~~~~~~~~~^^
File "/home/sym/miniconda3/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
raise self._exception
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/tenacity/asyncio/init.py", line 114, in call
result = await fn(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 1111, in _kosong_step_with_retry
return await self._run_with_connection_recovery(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<3 lines>...
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 1417, in _run_with_connection_recovery
return await operation()
^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kimi_cli/soul/kimisoul.py", line 1088, in _run_step_once
return await kosong.step(
^^^^^^^^^^^^^^^^^^
...<6 lines>...
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kosong/init.py", line 158, in step
result = await generate(
^^^^^^^^^^^^^^^
...<6 lines>...
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kosong/_generate.py", line 53, in generate
stream = await chat_provider.generate(system_prompt, tools, history)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/kosong/chat_provider/kimi.py", line 170, in generate
response = await self.client.chat.completions.create(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<6 lines>...
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/openai/resources/chat/completions/completions.py", line 2678, in create
return await self._post(
^^^^^^^^^^^^^^^^^
...<49 lines>...
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/openai/_base_client.py", line 1797, in post
return await self.request(cast_to, opts, stream=stream, stream_cls=stream_cls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/openai/_base_client.py", line 1518, in request
request = self._build_request(options, retries_taken=retries_taken)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/openai/_base_client.py", line 547, in _build_request
return self._client.build_request( # pyright: ignore[reportUnknownMemberType]
~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
headers=headers,
^^^^^^^^^^^^^^^^
...<8 lines>...
**kwargs,
^^^^^^^^^
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/httpx/_client.py", line 378, in build_request
return Request(
method,
...<8 lines>...
extensions=extensions,
)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/httpx/_models.py", line 408, in init
headers, stream = encode_request(
~~~~~~~~~~~~~~^
content=content,
^^^^^^^^^^^^^^^^
...<7 lines>...
),
^^
)
^
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/httpx/_content.py", line 216, in encode_request
return encode_json(json)
File "/home/sym/.local/share/uv/tools/kimi-cli/lib/python3.13/site-packages/httpx/_content.py", line 179, in encode_json
).encode("utf-8")
~~~~~~^^^^^^^^^
UnicodeEncodeError: 'utf-8' codec can't encode character '\udca9' in position 9763: surrogates not allowed

Additional information

No response

Start with kimi_cli/soul/kimisoul.py at _turn, _agent_loop, and _step, then trace the request through kosong/chat_provider/kimi.py at generate. Reproduce by submitting text containing the ✨ emoji on Kimi Code CLI 1.44.0 and follow the traceback to the request-building boundary. Done means the same input no longer raises the UTF-8 surrogate UnicodeEncodeError.