[Bug]: Gemini with prompt caching fails

[enyst]

Is there an existing issue for the same bug?

• I have checked the existing issues.

Describe the bug and reproduction steps

Gemini with prompt caching fails with an exception:

litellm.APIConnectionError: GeminiException - Gemini Context Caching only supports 1 message/block of continuous messages. Your idx, messages were - [(0, {'content': [{'type': 'text', 'text': 'A chat between a curious user and an artificial intelligence assistant. The assistant gives helpful, detailed answers to the user\'s questions.\n\n[1] The assistant can use a Python environment with <execute_ipython>...

Gemini is reported by liteLLM to support prompt caching, along with Claude, GPTs, and Deepseek. Unlike those though, this isn't automatic (ignoring silently the cache attribute), nor compatible with Anthropic.

OpenHands Installation

Development workflow

OpenHands Version

No response

Operating System

None

Logs, Errors, Screenshots, and Additional Context

No response

[enyst]

This is not failing on the current main, because we again changed how we do this in the agent: now we only use prompt caching for Anthropic.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions]

This issue was closed because it has been stalled for over 30 days with no activity.