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Friends of the Crustacean ๐Ÿฆž๐Ÿคโ€ข2d agoโ€ข
5 replies
Nathan Gross

LM Studio provider config causes "Cannot read properties of undefined (reading 'trim')"

Adding an LM Studio provider breaks all model responses, including Claude, even when LM Studio is only configured as a fallback.
Environment:
- Clawdbot 2026.1.15
- LM Studio 0.3.39 (Build 2)
- macOS, M4 Max
- Model: meta-llama-3.1-8b-instruct

The issue:
Adding this provider config causes the trim error on ALL requests (Claude included):
"models":{
  "providers":{
    "lm-studio":{
      "baseUrl":"http://localhost:1234/v1",
      "models":[
        {
          "id":"meta-llama-3.1-8b-instruct",
          "name":"Llama 3.1 8B",
          "reasoning":false,
          "input":["text"],
          "cost":{"input":0,"output":0,"cacheRead":0,"cacheWrite":0},
          "contextWindow":131072,
          "maxTokens":8192
        }
      ]
    }
  }
}

Confirmed working:
- LM Studio responds correctly to direct curl requests (curl http://localhost:1234/v1/chat/completions)
- Removing the lm-studio provider entirely โ†’ Claude works fine

Tried:
- Clearing ~/.clawdbot/agents/*/agent/models.json
- Adding "apiType": "openai"
- Daemon restarts

Seems like the provider config itself is breaking something during initialization, not just when the model is called. What's the correct way to configure LM Studio?

(note: claude code wrote this for me ๐Ÿ˜…)
Solution
The root cause is in the 
pi-coding-agent
 library (used by Clawdbot). When you define custom models in 
models.json
, the library's 
ModelRegistry.validateConfig()
 function requires:

1. 
apiKey
 - Must be present when defining custom models (this is a hard requirement)
2. 
baseUrl
 - Required when defining custom models
3. 
api
 - Should specify the API type (e.g., 
openai-completions
)

The "Cannot read properties of undefined (reading 'trim')" error likely occurs because:
- The library tries to process the incomplete config
- Without an 
apiKey
, some internal validation or processing path fails when trying to call 
.trim()
 on an undefined value

Alternative: Override-only config

If you just want to override the base URL for a built-in provider without defining custom models, use this simpler format:

"models": {
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