feat: give ask-matt the phase boundary decision tree

Replaces the two-bullet `Crossing sessions` section with all five options
at a phase boundary — continue, /clear, /handoff, subagent, /compact —
and discloses the ordered tree into a new PHASE-BOUNDARIES.md.

Corrections that come with it:

- /handoff was oversold as the general bridge between context windows.
  It is narrow: a new harness, a new directory, a colleague, or a side
  task forked mid-phase. What it buys is portability.
- /compact is the default at the bottom of the tree, not the first reach.
- Continue and subagent were missing branches entirely.

Context hygiene's escape hatch now says /compact rather than /handoff,
and the smart zone figure moves from ~120k to ~150k tokens.

Resolves the T5 grilling ticket on the v1.2 release map.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Matt Pocock
2026-08-05 10:10:33 +01:00
co-authored by Claude Opus 5
parent a621cc4f75
commit fa1e3227fb
4 changed files with 85 additions and 6 deletions
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"mattpocock-skills": patch
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Give `/ask-matt` the **phase boundary** decision tree, replacing the two-bullet `Crossing sessions` section.
A **phase** is a chunk of work inside a session — the grilling, the implementation, the QA — and the boundary between two of them is where you decide what to do with the context you've built. The router now carries all five options in order (**continue**, `/clear`, `/handoff`, **subagent**, `/compact`), with the ordered tree and its reasoning disclosed in a new `PHASE-BOUNDARIES.md`. Three fixes come with it:
- **`/handoff` was oversold.** It read as the general bridge between context windows. It's narrow: you need it only when something has to *travel* — a new harness, a new directory, a colleague, or a side task forked mid-phase. What it buys is portability.
- **`/compact` is the default, not the first reach.** It sits at the bottom of the tree, after the four cheaper or more precise questions above it. Starting there produces a session that's confidently wrong about whatever the summary flattened.
- **Two branches were missing entirely.** **Continue** is the one to rule out first — it's the only move that keeps the conversation as a primary source rather than a summary of one — and a **subagent** handles anything scoped tightly enough to run AFK.
Context hygiene's escape hatch now says `/compact` rather than `/handoff` (same harness, same directory, at a boundary — the handoff clause doesn't apply), and the smart zone figure is updated from ~120k to ~150k tokens.