spindle
Stage N2. Rapid classification bursts — sorting, tagging, filtering fragments. The workhorse stage at ~45% of cycle time. Most fragments die here.
What this skill does
# Spindle — Stage N2
The sorting room. Takes the noisy fragment bag from drift, classifies
each fragment, kills irrelevant noise, extracts themes.
## Inputs
From orchestrator: `fragment_bag` (from N1), `target_skill` (path),
`selectivity` (0-1, default 0.6), `cycle_number`.
## Procedure
### 1. Load Target Skill
Read SKILL.md. Build mental model of: what it does, what it handles,
what it assumes, what it declines.
### 2. Classify Each Fragment
One category + one signal strength (0-1) per fragment:
| Category | Code | Description |
|----------|------|-------------|
| Direct hit | `HIT` | Skill explicitly covers this |
| Edge case | `EDGE` | Within domain but near boundaries |
| Gap | `GAP` | Within domain but NOT covered |
| Friction | `FRIC` | User difficulty with documented workflow |
| Adjacent | `ADJ` | Related domain, different skill |
| Noise | `NOISE` | Irrelevant or unrealistically synthetic |
### 3. Filter
Survival threshold = `selectivity × 0.8`. Exceptions:
- `FRIC` and `GAP` survive at signal > 0.3 (always interesting)
- Synthetic fragments get +0.1 bonus (give creativity a chance)
| Cycle | Selectivity | Expected Kill Rate |
|-------|------------|-------------------|
| 1 | 0.7 | 60-70% |
| 2 | 0.5 | 40-50% |
| 3 | 0.3 | 20-30% |
| 4+ | 0.2 | 10-20% |
### 4. Extract Themes
If 2+ fragments touch the same area, elevate to a **theme** with
priority (high/medium/low). Themes are primary input for N3.
Flag contradictions (skill declines something users expect) and
escalations (fundamental structural issues).
### 5. Output Sorted Manifest
```yaml
sorted_manifest:
target_skill: /path/to/SKILL.md
input_fragments: 14
surviving_fragments: 6
kill_rate: 0.57
themes: [{name, fragment_ids, priority, reason}]
survivors: [{id, category, signal, content, tags, theme, notes}]
discarded: {count, categories: {NOISE: 4, ADJ: 2, HIT: 2}}
escalations: []
```
## Behavioral Rules
- **Be decisive.** If you can't classify quickly, it's NOISE.
- **Favor false positives.** Better to pass mediocre fragments to N3
than kill one that would have produced insight in REM.
- **Don't generate.** Spindle classifies, it doesn't create new fragments.
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