[Bug]: tool property descriptions are duplicated in anyOf elements #13683
Description
What happened?
When sending a request to LiteLLM (running it as a proxy) with tools that have parameters using anyOf, the parameter description is duplicated on each of them.
For example:
testdata.json:
{
"model": "gemini/2.5-flash",
"stream": false,
"tool_choice": "auto",
"tools": [
{
"type": "function",
"function": {
"name": "test",
"description": "this is a test tool",
"parameters": {
"additionalProperties": false,
"properties": {
"myprop": {
"default": null,
"description": "this is a test property",
"anyOf": [
{"type": "number"},
{"type": "string"},
{"type": "null"}
]
}
},
"type": "object"
}
}
}
],
"messages": [
{
"role": "user",
"content": "hello"
}
]
}
curl -v http://localhost:4001/chat/completions -X POST -H 'content-type: application/json' -d @testdata.json
If you then look at the request in the logs view in the UI, you see:
{
"model": "gemini/2.5-flash",
"tools": [
{
"type": "function",
"function": {
"name": "test",
"parameters": {
"type": "object",
"properties": {
"myprop": {
"anyOf": [
{
"type": "number",
"nullable": true,
"description": "this is a test property"
},
{
"type": "string",
"nullable": true,
"description": "this is a test property"
}
],
"default": null,
"description": "this is a test property"
}
}
},
"description": "this is a test tool"
}
}
],
"stream": false,
"messages": [
{
"role": "user",
"content": "hello"
}
],
"tool_choice": "auto"
}
Note the this is a test property being duplicated on every anyOf element.
Relevant log output
Are you a ML Ops Team?
No
What LiteLLM version are you on ?
b1cab7d09edd2b9c9e0634ad4ba5008a88793dc3b9aac8a40a52d312436b15ad
sha256:284b857e1f5f611baf07eddf75956436b7d0a212cc1b28839a3ea8bada5f11c6
^ That's the container image ID since that's how I'm running it. I pulled the image the other day, so it should be recent. But I have honestly no clue what version it is. I looked through the startup output. I looked through the UI. I looked through the API endpoints. Nowhere could I find anything where it would tell me what its version is. So as a side item to this issue, I might suggest making this easier to discover.
Twitter / LinkedIn details
No response