You are getting this because the latest local Agent Canvas code is launching an

agent-server

dependency set that can resolve to an incompatible LiteLLM/MCP combination. I checked the repo and the current code path is: • pins Agent Server to

1.55.1

. • launches it through

uvx

. •

openhands-sdk==1.55.1

depends on: ◦

litellm>=1.93.0

with no upper bound ◦

fastmcp<4,>=3.2.0

•

fastmcp

pulls

mcp<2.0

, currently resolving to

mcp==1.30.0

. • Because LiteLLM has no upper bound in SDK

1.55.1

,

uv

resolves

litellm==1.106.0

. That combination is broken:

litellm==1.106.0 imports CacheableResult from mcp.types
mcp==1.30.0 does not define CacheableResult

So when an LLM call goes through LiteLLM, LiteLLM imports its MCP/proxy code and fails here:

cannot import name 'CacheableResult' from 'mcp.types'

The error is then wrapped as:

LLMServiceUnavailableError
  litellm.APIConnectionError
    Litellm_proxyException

Recommended fixes: 1. upgrading the Agent Server stack to `1.56.0`: 2. Pin LiteLLM below

1.106

in the agent-server environment:

litellm<1.106

github.com/OpenHands/OpenHands/pull/18670 - working on fix here

BTW @quick-window-91705 do you think we could remove the limit that branches need to be up to date before merge on OpenHands/automation? It’s making it very slow to get the release out there

Removed it