## Describe the bug

Using a LiteLLM DB skill (`litellm_skill_...`) with `/v1/chat/completions` against an OpenAI model returns:

`OpenAIException - Missing required parameter: 'tools[0].type'`

## To Reproduce

1. Create a skill with `custom_llm_provider=litellm_proxy` 2. Call `/v1/chat/completions` with an OpenAI model and:

```json "container": { "skills": [{"type": "custom", "skill_id": "litellm_skill_<id>"}] }