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The first call on every session. Returns Mcp-Session-Id in the response headers — include it on all subsequent calls.

Request

Response

Important response header: Mcp-Session-Id: <uuid> — store and echo on every follow-up call.

instructions

result.instructions is the per-chat system prompt, rendered fresh from X-Chat-Id + X-User-Email. It’s Tier 4 of the six system-prompt tiers and reaches clients that natively surface InitializeResult.instructions (Claude Desktop, MCP Inspector, OpenAI Agents SDK).
LiteLLM is a tool-call proxy and does not forward instructions to the LLM. If you’re running Computer Use through LiteLLM, consume the prompt via GET /system-prompt instead — or via the Open WebUI filter, which does the HTTP fetch and injects the prompt into the system message for you.

Errors

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