Jev handles Claude Code's fast decision layer
With Opus 5.5 writing code and Fable 5.1 acting as advisor, fast decisions like picking files, tools and retries go to Jev in under half a second.
Claude Code tip: once Opus 5.5 is your main model, don't let Fable 5.1 sit unused. Keep it on call through /advisor. Run /advisor fable. Opus 5.5 keeps writing the code. Fable 5.1 sees the full session, including every tool call, and weighs in at three points: → before a plan: is this the right approach? → when the same error returns: am I looking in the wrong place? → before saying "done": what did I miss? Fable 5.1 reviews. Opus 5.5 ships. Jev engineering uses the same approach one layer down: quick decisions (which file, which tool, retry or stop) go to Jev in under half a second. The big model only gets the decisions that call for deeper thinking. - the full tree > Opus 5.5 on high runs the main session > explorer reads the code > worker edits and runs tests > researcher looks up the docs > all three on medium > Fable 5.1 stays on call as the advisor Paste this tree and prompt into Claude Code ↓ "Rebuild my Claude Code setup around this tree: 1. Check ~/.claude/agents and .claude/agents for subagents that already fit the explorer, worker and researcher roles. > Draft new ones only for roles that are missing > Set each to model: opus and effort: medium > Skip subagents that pin a different model and list them 2. Set the main session to high using effortLevel in ~/.claude/settings.json, and set advisorModel to fable 3. Check for anything that could disable the advisor (CLAUDE_CODE_DISABLE_ADVISOR_TOOL, DISABLE_TELEMETRY, any variable that prevents feature-flag fetching), plus CLAUDE_CODE_EFFORT_LEVEL, which overrides subagent effort. Report what you find without changing it 4. Add one rule to ~/.claude/CLAUDE.md: consult the advisor before a large plan, when an error repeats, and before calling a long task done Show me every proposed change as a diff first. Don't edit anything until I say go." ↳ http://code.claude.com/docs/en/advisor
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