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A Claude Code plugin that makes Opus behave like Fable — completion, evidence, and verification enforced as procedure. Ships only what a Fable-vs-Opus comparison proved transferable.
| Date | Stars |
|---|---|
| 2026-07-31 | 887 |
| 2026-08-04 | 891 |
| 2026-08-06 | 891 |
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English | [한국어](README.ko.md)
# fablize — run Opus like Fable
[](https://github.com/fivetaku/fablize/stargazers)
[](https://opensource.org/licenses/MIT)
A Claude Code plugin that makes Opus (or any Claude model) **see a task through to the end — with evidence and verification — as procedure, not as luck.**
## Why
When Fable 5 shipped, I ran a controlled comparison of Fable 5 and Opus 4.8 (an A/B set of 19 runs plus 26 real working sessions, ~1,500 tool calls). The finding:
- On closed, answer-bearing work (code, logic, builds), the two models were effectively tied.
- The gap appeared only on open-ended work, and its nature was "following an implication one step further."
- That depth is **model capability** — it could not be transferred by instructions or a harness. An injection experiment confirmed it: Opus could not reproduce the defects Fable found on its own.
- But the **procedure** of good work — actually running what you build, seeing it through, investigating systematically — does transfer.
fablize applies only the procedures whose effect was verified. It does not raise the model's ceiling; it makes the model reach its own ceiling.
## What transfers and what doesn't
| Trait | Transferable? | Reason |
|---|:--:|---|
| Verification grounding (run & observe the artifact) | ✅ shipped | A procedure Opus skipped "not because it can't, but because it didn't." Injecting it raised render-verification behavior measurably. |
| Multi-story completion + evidence gate | ✅ shipped | A procedure — decompose, checkpoint, refuse completion without proof. |
| Systematic investigation (reproduce → hypotheses → causal chain) | ✅ shipped | A procedure — on par with what the strong model already does. |
| Early-stop prevention | ✅ shipped | A deterministic hook — catches "I'll do X" without doing it. |
| Out-of-spec defect discovery | ❌ not possible | Capability. Injection was refuted — the model finds it, or it doesn't. |
| Open-ended creative detail | ❌ not possible | Capability. Shows only where there is no fixed answer. |
| Self-driven propagation depth | ❌ not possible | Capability. Directed propagation transfers; self-started depth does not. |
The non-transferable rows are the model's job (or a human's), not a harness's. When you hit them, fablize tells you to escalate instead of pretending.
## What's included (verified only)
- **Verification grounding** — render/executable artifacts (HTML, SVG, games, charts) are run and observed before completion.
- **Multi-story verification gate** — `goals.py` decomposes work and refuses a groundless "done."
- **Investigation protocol** — reproduce, compete hypotheses, trace the full causal chain.
- **Early-stop hook** — blocks promising-without-doing.
- **Per-task router** — injects only the matching verified discipline.
Negligible or unverified ideas (style mimicry, broad reasoning injection, a silent-recovery guard, a review-recall scan) are **not shipped.** They stay in personal development until a controlled experiment confirms their effect.
## Install
```
/plugin marketplace add fivetaku/fablize
/plugin install fablize
```
The per-task router (a UserPromptSubmit hook) registers automatically.
For always-on operation (the rules resident in context), run once:
```
bash ${CLAUDE_PLUGIN_ROOT}/setup/setup.sh # choose local (recommended) or global
```
Uninstall: `bash ${CLAUDE_PLUGIN_ROOT}/setup/uninstall.sh`
> If fablize helps, a ⭐ on the repo means a lot — setup asks once (a single opt-in question); it never stars without your explicit "yes".
## How it behaves
- Trigger with `/fablize` or phrases like "see it through", or automatically when installed always-on.
- 2+ stories → decompose + verification gate. Debugging → investigation protocol. Render artifact → verification grounding. Hard task → adaptive thinking pluExcerpt of 4,620 characters
Read on GitHubWould you bet a product on this? Bounded 0–100 and slow moving.
matched fp:74e5de609fb3aa96, topic:agentic
