nw-ab-migrate-monolith (PROCEDURE)

Kind: PROCEDURE | One job: migrate one existing agent monolith | One trigger: a legacy agent has measured size, embedded-configuration, duplication, aggressive-language, or multi-responsibility debt.

Deterministic workflow

Run these steps in order:

1. Baseline — Measure the agent's lines, words, bytes, responsibilities, monolith debt, and existing behavioral projections. Stop: baseline is red, the target is not an agent, or a textual pin cannot be preserved.
2. Extract configuration — Move semantic configuration into frontmatter while preserving name, model, tools, maxTurns, skills, and public behavior. Stop: a field cannot be represented without behavior change.
3. Map — Reuse existing skills first. Map each original rule to one owner: lean agent core, one existing skill, or one extracted skill. Define disjoint, exhaustive triggers for extracted skills. Stop: an owner overlaps, a trigger gaps/overlaps, or public fan-out is missing.
4. Simplify — Preserve the agent name, public contract, tool surface, model, and maxTurns; retain only routing and global invariants in the core. Remove duplication and route distinct-trigger knowledge/procedures. Safety by construction first (frontmatter tool surface, typed grammar); hooks last resort with a recorded reason (GDP-0). Prefer remove, relax, route, or construct over a new check. Stop: preservation would change behavior or require added ceremony.
5. De-escalate language — Replace aggressive language with direct calm language; retain MUST only for skill-loading instructions. Stop: a required textual pin cannot be preserved.
6. Optimize referenced skills — For each referenced skill selected for optimization, invoke nw-ab-optimize-skill. Continue agent migration when it returns NOT_ELIGIBLE. Stop: a preservation risk, or a worsened resident cost without an explicit decision.
7. Validate once — Batch the planned edits, run existing agent validation once through nw-ab-validate-spec, and execute the existing behavioral projections. Do not create validators or tests. Stop: validation or a projection is red.
8. Handoff — Report ownership map, trigger partition, before/after measurements, executed projections, independent-review-needed, and residual INDETERMINATE. Stop: any required fact remains unmeasured.

Composition

Kind	Skill	Use
PROCEDURE	nw-ab-validate-spec	Step 7, agent validation only
PROCEDURE	nw-ab-optimize-skill	Step 6, for a referenced skill selected for optimization
KNOWLEDGE	nw-ab-house-style	Steps 2, 4, and 5; preserve lean core and literal protections

Boundaries

• Input is one existing agent; skill optimization remains the composed procedure's job.
• nw-ab-validate-spec validates the agent result only.
• Existing behavioral projections are evidence, never permission to change behavior.
• No public command, agent, or artifact is created by migration.

Success criteria

• Agent name, public contract, model, tools, and maxTurns preserved.
• Every original rule has exactly one owner; extracted triggers are disjoint and exhaustive.
• Referenced skills are optimized only through nw-ab-optimize-skill when eligible.
• Existing validation runs once after batched edits; existing behavioral projections remain green.
• Terminal handoff contains measurements, ownership, trigger partition, review need, and residual INDETERMINATE.