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Open WebUI consumes OpenAPI tool servers, and its companion proxy mcpo turns any stdio MCP server into one. That is the recipe for Nika: run the oracle behind mcpo, register the endpoint. Wiring is manual — nika wire has no Open WebUI target.

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The recipe

The binary comes first: brew install supernovae-st/tap/nika (other paths). Then: 
uvx mcpo --port 8000 -- nika mcp
mcpo serves the oracle’s eight nika_* tools as OpenAPI endpoints (the interactive docs appear at http://localhost:8000/docs). Register http://localhost:8000 as a tool server in Open WebUI — its mcpo guide shows where — and the tools appear in chat.

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What you get

Validation, explanation, schema and cost answers with receipts — no execution, no mutation, by design (the oracle’s contract). Running workflows stays on the terminal, where the budget flags and traces live.

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Verify

Ask a chat with the tool server enabled to check a workflow — the nika_check call shows up in the response’s tool trail. Then prove the loop end-to-end: integrate in 10 minutes.