Try an interactive version of this dialog: Sign up at solve.it.com, click Upload, and pass this URL.

Note: 13

Solveit issue when tools are enabled.

Prompt: 1

hi

Assistant: 2,415

Whoops! An error (litellm.ServiceUnavailableError: litellm.MidStreamFallbackError: litellm.BadRequestError: Vertex_ai_betaException BadRequestError - b'{\n "error": {\n "code": 400,\n "message": "* GenerateContentRequest.tools[0].function_declarations[28].parameters.properties[types].any_of[1].items: missing field.\n* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[types].any_of[1].items: missing field.\n",\n "status": "INVALID_ARGUMENT"\n }\n}\n') occurred while processing your request. If this problem persists, please contact us on Discord. Please include your dialog url and error info in your message.

Copied!
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 2115, in make_call
    response = await client.post(
               ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/logging_utils.py", line 190, in async_wrapper
    result = await func(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/litellm/llms/custom_httpx/http_handler.py", line 464, in post
    raise e
  File "/usr/local/lib/python3.12/site-packages/litellm/llms/custom_httpx/http_handler.py", line 420, in post
    response.raise_for_status()
  File "/usr/local/lib/python3.12/site-packages/httpx/_models.py", line 829, in raise_for_status
    raise HTTPStatusError(message, request=request, response=self)
httpx.HTTPStatusError: Client error '400 Bad Request' for url 'https://generativelanguage.googleapis.com/v1alpha/models/gemini-3-flash-preview:streamGenerateContent?key=AIzaSyAS-uNfTCgVuBJ2CbvYwkMCb_7l1oatt3A&alt=sse'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handler.py", line 1812, in __anext__
    await self.fetch_stream()
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handler.py", line 1796, in fetch_stream
    self.completion_stream = await self.make_call(
                             ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.py", line 2121, in make_call
    raise VertexAIError(
litellm.llms.vertex_ai.common_utils.VertexAIError: b'{\n  "error": {\n    "code": 400,\n    "message": "* GenerateContentRequest.tools[0].function_declarations[28].parameters.properties[types].any_of[1].items: missing field.\\n* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[types].any_of[1].items: missing field.\\n",\n    "status": "INVALID_ARGUMENT"\n  }\n}\n'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handler.py", line 2003, in __anext__
    raise exception_type(
          ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/exception_mapping_utils.py", line 2340, in exception_type
    raise e
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/exception_mapping_utils.py", line 1359, in exception_type
    raise BadRequestError(
litellm.exceptions.BadRequestError: litellm.BadRequestError: Vertex_ai_betaException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "* GenerateContentRequest.tools[0].function_declarations[28].parameters.properties[types].any_of[1].items: missing field.\\n* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[types].any_of[1].items: missing field.\\n",\n    "status": "INVALID_ARGUMENT"\n  }\n}\n'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/root/solveit/solveit/aimsg.py", line 444, in run_ai
    return await _astream_to_msg(rs,msg,inc_use)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/solveit/solveit/aimsg.py", line 157, in _astream_to_msg
    async for o in AsyncStreamFormatter(inc_use, mx=600, debug=False).format_stream(rs):
  File "/usr/local/lib/python3.12/site-packages/lisette/core.py", line 592, in format_stream
    async for o in rs: yield self.format_item(o)
  File "/usr/local/lib/python3.12/site-packages/lisette/core.py", line 487, in _call
    async for chunk in res: yield chunk
  File "/usr/local/lib/python3.12/site-packages/lisette/core.py", line 465, in astream_with_complete
    async for chunk in agen:
  File "/usr/local/lib/python3.12/site-packages/litellm/litellm_core_utils/streaming_handler.py", line 2013, in __anext__
    raise MidStreamFallbackError(
litellm.exceptions.MidStreamFallbackError: litellm.ServiceUnavailableError: litellm.MidStreamFallbackError: litellm.BadRequestError: Vertex_ai_betaException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "* GenerateContentRequest.tools[0].function_declarations[28].parameters.properties[types].any_of[1].items: missing field.\\n* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[types].any_of[1].items: missing field.\\n",\n    "status": "INVALID_ARGUMENT"\n  }\n}\n' Original exception: BadRequestError: litellm.BadRequestError: Vertex_ai_betaException BadRequestError - b'{\n  "error": {\n    "code": 400,\n    "message": "* GenerateContentRequest.tools[0].function_declarations[28].parameters.properties[types].any_of[1].items: missing field.\\n* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[types].any_of[1].items: missing field.\\n",\n    "status": "INVALID_ARGUMENT"\n  }\n}\n'

Note: 105

After some investigation the issue was caused by symfiles_package schema. types param had this definition: 'anyOf': [{'type': 'string'}, {'type': 'array'}], and apparently gemini needs the type of the array to be passed. It needs it to be: {'type': 'array', 'items':{}}

Note: 90

The issue was caused by this definition

Copied!
def symfiles_package(
    sym:str, # Dotted symbol path or "_last" for previous result
    types:str | list='py', # List or comma-separated str of ext types from: py, js <- HERE
...

Note: 4

Let's replicate:

Code: 16 () 

from lisette import *
from fastcore.all import *

Code: 49 () 

try: print(Chat('gemini/gemini-3-flash-preview', tools=[symfiles_package])('hi'))
except Exception as e: print(e)

Output: 217 


Give Feedback / Get Help: https://github.com/BerriAI/litellm/issues/new
LiteLLM.Info: If you need to debug this error, use `litellm._turn_on_debug()'.

litellm.BadRequestError: GeminiException BadRequestError - {
  "error": {
    "code": 400,
    "message": "* GenerateContentRequest.tools[0].function_declarations[0].parameters.properties[types].any_of[1].items: missing field.\n",
    "status": "INVALID_ARGUMENT"
  }
}

Code: 33 () 

def test_func(tags: str | list[str]): "litlle docs"
lite_mk_func(test_func)

Output: 373 

{'type': 'function',
 'function': {'name': 'test_func',
  'description': 'litlle docs',
  'parameters': {'type': 'object',
   'properties': {'tags': {'type': 'object',
     'description': '',
     'anyOf': [{'type': 'string'}, {'type': 'array'}]}},
   'required': ['tags']}}}

Code: 48 () 

try: print(Chat('gemini/gemini-3-flash-preview', tools=[test_func])('hi'))
except Exception as e: print(e)

Output: 217 


Give Feedback / Get Help: https://github.com/BerriAI/litellm/issues/new
LiteLLM.Info: If you need to debug this error, use `litellm._turn_on_debug()'.

litellm.BadRequestError: GeminiException BadRequestError - {
  "error": {
    "code": 400,
    "message": "* GenerateContentRequest.tools[0].function_declarations[0].parameters.properties[tags].any_of[1].items: missing field.\n",
    "status": "INVALID_ARGUMENT"
  }
}

Code: 30 () 

import types
from typing import  get_origin
from toolslm.funccall import _types

Code: 6 () 

_types(list[str])

Output: 28 

('array', 'string')

Code: 13 () 

list[str] in {list, tuple}

Output: 1 

False

Code: 13 () 

isinstance(list[str], types.GenericAlias)

Output: 1 

True

Code: 34 () 

get_origin(list[str]), get_origin(list), get_origin(list[typing.Any]), get_origin(dict[str|int])

Output: 12 

(list, None, list, dict)

Code: 355 () 

from typing import get_origin
from toolslm.funccall import NoneType, custom_types, inspect, _types

def _handle_type(t, defs):
    "Handle a single type, creating nested schemas if necessary"
    ot = ifnone(get_origin(t), t)
    if t is NoneType: return {'type': 'null'}
    if t in custom_types: return {'type':'string', 'format':t.__name__}
    if ot is dict: return {'type': _types(t)[0]} 
    if ot in (list, tuple, set, dict): return {'type': _types(t)[0], 'items':{}}  # <- this fixes the issue
    if isinstance(t, type) and not issubclass(t, (int, float, str, bool)) or inspect.isfunction(t):
        defs[t.__name__] = _get_nested_schema(t)
        return {'$ref': f'#/$defs/{t.__name__}'}
    return {'type': _types(t)[0]}

import toolslm.funccall
toolslm.funccall._handle_type=_handle_type

Code: 9 () 

_handle_type(list, None)

Output: 48 

{'type': 'array', 'items': {}}

Code: 36 () 

c=Chat('gemini/gemini-3-flash-preview', tools=[test_func])
c('hi')

Output: 250

hello! how can I help you today?

  • id: ETRxaZTQGf7P_uMP2e7HmQQ
  • model: gemini-3-flash-preview
  • finish_reason: stop
  • usage: Usage(completion_tokens=9, prompt_tokens=61, total_tokens=70, completion_tokens_details=None, prompt_tokens_details=PromptTokensDetailsWrapper(audio_tokens=None, cached_tokens=None, text_tokens=61, image_tokens=None))

Code: 48 

c=Chat('anthropic/claude-haiku-4-5', tools=[symfiles_package])
c('hi do u see symfiles_package')

Output: 819

Yes, I can see the symfiles_package function! It's available to me as a tool.

This function returns XML context of all files in a package specified by the sym parameter. It has lots of useful options like:

  • sym (required): The dotted symbol path or "_last" for previous result
  • types: Filter by file types (py, js, java, c, cpp, rb, r, ex, sh, web, doc, cfg)
  • file_glob/file_re: Filter files by glob pattern or regex
  • folder_re: Only enter folders matching regex
  • recursive: Search subfolders (default: true)
  • max_size: Skip files larger than this
  • sigs_only: Return just signatures instead of full text
  • And many more options for customizing the output

Would you like me to use it to explore a specific package or symbol? Just let me know the sym path you'd like to examine!

  • id: chatcmpl-526d1995-5467-4ce7-b519-136cbab56d10
  • model: claude-haiku-4-5-20251001
  • finish_reason: stop
  • usage: Usage(completion_tokens=238, prompt_tokens=1284, total_tokens=1522, completion_tokens_details=None, prompt_tokens_details=PromptTokensDetailsWrapper(audio_tokens=None, cached_tokens=0, text_tokens=None, image_tokens=None, cache_creation_tokens=0, cache_creation_token_details=CacheCreationTokenDetails(ephemeral_5m_input_tokens=0, ephemeral_1h_input_tokens=0)), cache_creation_input_tokens=0, cache_read_input_tokens=0)