monozukuri-router git:20260911.18c2ca9A

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---
name: monozukuri-router
description: "Step 0 of consequential software work under Monozukuri. Classify the task, assess its risk tier, choose execute or sensei mode, and compose the sequence of Monozukuri skills and the Definition of Done for it. Skip for trivial one-line edits, pure questions, and throwaway scripts."
---

# Monozukuri router

The router does no engineering work itself. It decides which Monozukuri
practices apply to the task in front of it and in what order, emits a plan
header, and hands off to the composed sequence.

## Use this skill when

- any feature, bugfix, refactor, incident, migration, release, or
  investigation that is more than a one-line change;
- the user asks to be guided or taught;
- the user asks for a review of their own approach; or
- the user asks to set up Monozukuri for a project.

## Do not use when

- the change is a trivial one-liner;
- the request is a pure question with no change to the system; or
- the code is a throwaway script.

## Procedure

1. **Choose interaction mode.** `execute` (default) or `sensei`. Route to
   `sensei` when the user asks to be guided / taught / reviewed / set up.
   Incident or "production is down" language forces `execute`. Detail in
   `monozukuri-core/references/sensei.md`.
2. **Classify the task.** Pick one type: `feature`, `bugfix`, `refactor`,
   `incident`, `migration`, `release`, `investigation`, `docs`, `greenfield`
   (a new project, or a new standalone subsystem, built from scratch). Set
   context flags: `security`, `performance`, `production`, `data`, `auth`.
3. **Assess risk.** Tier `low|medium|high|critical` per
   `monozukuri-core/references/constitution.md`. When signals disagree, take
   the higher tier.
4. **Low-risk fast-path.** If the tier is `low` and no modifier applies
   (documentation work is nearly always this): emit
   `fast-path: apply genchi-genbutsu + kanso + kodawari inline` and stop. Never
   inflate a small task.
5. **Compose.** Look up the playbook in
   `monozukuri-core/references/playbooks.md`; apply the `security` /
   `performance` modifiers matching the context flags; scale verification
   depth by risk tier. For `greenfield`, the sequence begins `nemawashi →
   monozukuri-blueprint`; the four blueprint stages are gated on user
   approval, and phases execute one at a time after stage 4.
6. **Emit the plan header** (see Output).

## Output

```text
Task: <one line>
Mode: <execute|sensei>
Context: <type> [+security] [+performance]      Risk: <tier> → <human gate>
Monozukuri sequence:
  <skill> → <skill> → [<injected step>] → <skill> ...
DoD: <n> items (<playbook> [+modifiers], <tier>) — see monozukuri-core/references/definition-of-done.md
Change budget: declare expected file scope before CHANGE (see change-budget.md)
```

Worked example:

```text
Task: add OAuth login
Mode: execute
Context: feature +security      Risk: high → architecture-approval gate
Monozukuri sequence:
  nemawashi → genchi-genbutsu → kanso → [threat-model]
  → poka-yoke (+security test cases) → kata
  → kodawari (+security review) → andon (+security observability)
  → shukka (+security verification) → hansei
DoD: 11 items (feature + security, high) — see monozukuri-core/references/definition-of-done.md
Change budget: declare expected file scope before CHANGE (see change-budget.md)
```

```text
Task: build a new invoicing service from scratch
Mode: execute
Context: greenfield      Risk: high → architecture-approval gate
Monozukuri sequence:
  nemawashi → monozukuri-blueprint (4 gated stages)
  → per phase: kanso → kata → poka-yoke → kodawari → andon → shukka → hansei
DoD: 8 items (greenfield, high) — see monozukuri-core/references/definition-of-done.md
```

## Handoff

After the header, proceed through the composed sequence using each named
skill in order. `monozukuri-core` remains the umbrella contract
(DISCOVER/CHANGE/PROVE) that governs the whole task.

If a referenced skill is not installed, apply its named lens inline instead of
trying to invoke it.