---
type: trekbrief
brief_version: "2.1"
created: 2026-07-02
task: "Fixture: high-effort all phases on fable (v5.9 allowlist test)"
slug: brief-effort-fable
project_dir: .claude/projects/2026-07-02-brief-effort-fable/
research_topics: 0
research_status: complete
auto_research: false
interview_turns: 4
source: fixture
phase_signals:
  - phase: research
    effort: high
    model: fable
  - phase: plan
    effort: high
    model: fable
  - phase: execute
    effort: high
    model: fable
  - phase: review
    effort: high
    model: fable
---

# Task: High-effort fable fixture

## Intent

Test fixture for the v5.9 fable model tier — all 4 phases at the
high effort tier with explicit fable model overrides. Mirrors
brief-effort-high.md with `model: opus` replaced by `model: fable`.

## Goal

Resolver returns `{effort: 'high', model: 'fable'}` for each of the 4
PHASE_SIGNAL_PHASES.

## Success Criteria

- Validator passes with no BRIEF_INVALID_MODEL.
- resolvePhaseSignal(fm, phase).effort === 'high' for all 4 phases.
- resolvePhaseSignal(fm, phase).model === 'fable' for all 4 phases.