LiteLLM proxy error: "Anthropic doesn't support tool calling without tools=" even with litellmProxy: true (v1.1.31)

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

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

已解决

Hi, i get the same issue when trying to compact using Anthropic models even with the "litellmProxy": true..

To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.

I still get this error whenever compaction threshold is reached, although I have options.litellmProxy = true

I think it worked for a while in the spring, but hasn't worked in at least a month

OpenCode 1.17.7

Seems they have removed litellmProxy option. My workaround is add github-copilot into my provider ID. Works like a charm

opencode/packages/opencode/src/session/llm/request.ts

Lines 159 to 175 in 6b074ed

    
           if ( 
        
             input.model.providerID.includes("github-copilot") && 
        
             Object.keys(tools).length === 0 && 
        
             hasToolCalls(input.messages) 
        
           ) { 
        
             // Copilot needs a tools field when replaying prior tool calls, even if no tools are currently enabled. 
        
             tools["_noop"] = aiTool({ 
        
               description: "Do not call this tool. It exists only for API compatibility and must never be invoked.", 
        
               inputSchema: jsonSchema({ 
        
                 type: "object", 
        
                 properties: { 
        
                   reason: { type: "string", description: "Unused" }, 
        
                 }, 
        
               }), 
        
               execute: async () => ({ output: "", title: "", metadata: {} }), 
        
             }) 
        
           }

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LiteLLM proxy error: "Anthropic doesn't support tool calling without tools=" even with litellmProxy: true (v1.1.31) #10037

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	if (
	input.model.providerID.includes("github-copilot") &&
	Object.keys(tools).length === 0 &&
	hasToolCalls(input.messages)
	) {
	// Copilot needs a tools field when replaying prior tool calls, even if no tools are currently enabled.
	tools["_noop"] = aiTool({
	description: "Do not call this tool. It exists only for API compatibility and must never be invoked.",
	inputSchema: jsonSchema({
	type: "object",
	properties: {
	reason: { type: "string", description: "Unused" },
	},
	}),
	execute: async () => ({ output: "", title: "", metadata: {} }),
	})
	}

LiteLLM proxy error: "Anthropic doesn't support tool calling without tools=" even with litellmProxy: true (v1.1.31) #10037

Description

Description

Expected

Actual

Environment

Related

Activity

yiethan0618-lab commented on Jan 23, 2026

ewencodes commented on Jan 28, 2026

github-actions commented on Mar 30, 2026

ollisal commented on Jun 15, 2026

Jeffwhen commented on Jun 30, 2026

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