fix: allow tool call even when server name prefix is missing

[uc4w6c]

Title

fix: allow tool call even when server name prefix is missing

Relevant issues

Fixes #14986

When there’s only one server, the prefix is no longer added, which caused an error during the MCP tool call since the prefix couldn’t be extracted in this part of the code:
https://github.com/BerriAI/litellm/blob/main/litellm/proxy/_experimental/mcp_server/server.py#L660

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix

Changes

[vercel]

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[krrishdholakia]

Hi @uc4w6c what happens in the case where LiteLLM proxies 2 mcp servers with conflicting tool names?

[uc4w6c]

Hi @krrishdholakia ,
Sorry — I forgot to include the details earlier.

When there’s only one server, the prefix is no longer added, which caused an error during the MCP tool call since the prefix couldn’t be extracted in this part of the code:
https://github.com/BerriAI/litellm/blob/main/litellm/proxy/_experimental/mcp_server/server.py#L660

[uc4w6c]

Hi @krrishdholakia,
Sorry — I initially replied to a different point by mistake.

Regarding your question: when LiteLLM proxies two MCP servers with conflicting tool names, the tool names include the server name as a prefix, so it continues to work as before.

[uc4w6c]

I’ve resolved the conflict.

[krrishdholakia]

@uc4w6c can you please resolve the conflicts?

[uc4w6c]

@krrishdholakia
I've addressed it. Please take a look.