feat: Add header passing support for MCP tools in Responses API

[Sameerlite]

Title

feat: Add header passing support for MCP tools in Responses API

Relevant issues

Fixes LIT-1501

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

🆕 New Feature 🐛 Bug Fix 🧹 Refactoring 📖 Documentation 🚄 Infrastructure ✅ Test

Changes

• Extract headers from secret_fields.raw_headers and tools[].headers
• Merge headers from both sources before passing to MCP server
• Add extract_mcp_headers_from_request utility method
• Fix tool name prefix handling in _execute_tool_calls
• Add get_mcp_servers_from_ids method to MCPServerManager
• Ensure raw_headers is properly converted to dict before use

#Testing:

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Nov 27, 2025 2:31am

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