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LiteLLM proxy error: "Anthropic doesn't support tool calling without tools=" even with litellmProxy: true (v1.1.31) #10037
Description
Description
## Description
Using OpenCode v1.1.31 with LiteLLM proxy, error occurs on **new sessions**:
litellm.UnsupportedParamsError: Anthropic doesn't support tool calling without tools= param specified.
Received Model Group=claude-opus-4-5-20251101
Available Model Group Fallbacks=None
## Config
```json
{
"provider": {
"some-litellm": {
"name": "some-litellm",
"api": "https://api.some-litellm.com/v1",
"options": {
"litellmProxy": true
},
"models": {
"claude-opus-4-5-20251101": {
"name": "Claude Opus 4.5",
"limit": { "context": 200000, "output": 32000 }
}
}
}
}
}
Expected
PR #8658 should inject _noop tool when litellmProxy: true or provider ID contains "litellm".
Actual
The fix doesn't work. Error occurs immediately on first message.
Environment
- OpenCode: v1.1.31
- Platform: Windows 11
- Cannot modify server-side LiteLLM config
Related
- feat: add litellmProxy provider option for explicit LiteLLM compatibility #8658, fix: handle dangling tool_use blocks for LiteLLM proxy compatibility #8497, fix: Anthropic via LiteLLM/proxies rejects requests with tool history but no tools param #8246, LiteLLM error: Anthropic doesn't support tool calling without tools= param specified #2915
### Plugins
on my opencode
### OpenCode version
v1.1.31
### Steps to reproduce
Sisyphus
### Screenshot and/or share link
_No response_
### Operating System
Windows 10
### Terminal
Windows PowerShell
Activity
yiethan0618-lab commentedon Jan 23, 2026
已解决
ewencodes commentedon Jan 28, 2026
Hi, i get the same issue when trying to compact using Anthropic models even with the
"litellmProxy": true..github-actions commentedon Mar 30, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.
ollisal commentedon Jun 15, 2026
I still get this error whenever compaction threshold is reached, although I have
options.litellmProxy = trueI think it worked for a while in the spring, but hasn't worked in at least a month
OpenCode 1.17.7
Jeffwhen commentedon Jun 30, 2026
Seems they have removed litellmProxy option. My workaround is add
github-copilotinto my provider ID. Works like a charmopencode/packages/opencode/src/session/llm/request.ts
Lines 159 to 175 in 6b074ed