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Qwen Code is a Gemini CLI fork — same mcpServers key, same user-scope settings.json, its own dotdir. The binary comes first: brew install supernovae-st/tap/nika (other paths). Add the nika entry to ~/.qwen/settings.json: 
{ "mcpServers": { "nika": { "command": "nika", "args": ["mcp"] } } }
nika wire qwen ships in the next release and writes exactly this — only the mcpServers key is touched, every other setting survives, and re-running prints · current (idempotent).

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The repo side

nika init writes the agent-teaching surface (AGENTS.md, rules) plus the $schema modeline for validation and completion on *.nika.yaml.

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Verify

Qwen Code’s MCP listing shows nika with the eight nika_* tools (the oracle’s contract: validate, explain, schema, cost — no execution, no mutation). Then prove the loop end-to-end: integrate in 10 minutes.