post-write-drift-check

name	post-write-drift-check
description	Back-summarize the finished article draft and diff it against the already-verified bundle to catch drift (new errors or omissions introduced during drafting/styling) — even when the bundle itself already passed precision and recall checks. Use this immediately after any drafting sop (section-drafting-with-style, or any future content-faithful/hybrid drafting sop) produces an article_draft, before considering the article final. Shared by both quality-assurance and audience-first-writing.
execution	subagent
prompt	./prompt.md
input	bundle (dict), article_draft (string)
output	drift_result (dict — failure_type, drift_issues)
dependencies	{"sops":["spawn-agent"]}

Post-Write Drift Check

Back-summarization diff: read the finished article fresh, compare against the bundle, flag drift. Catches errors introduced by rewriting/styling — style is exactly where new commission/omission errors sneak in, per the design spec's ideation findings (§2 point 3).

Execution

Subagent — spawned via subagent-spawning/spawn-agent skill.

Why Subagent

The back-summarization step needs a reading of the article that isn't anchored to having just written it — the same "fresh eyes" principle as the pre-write checks, applied post-draft.

Shared Across Strategies

Defined here under quality-assurance (this task), but invoked by audience-first-writing's drafting tactics too (spec §7's "Cross-strategy dependency", §8's shared-sops table) — not redefined there, just referenced.

Scope Boundary

This sop diffs article-vs-bundle only. It does NOT re-query the raw paper — that would duplicate pre-write-precision-check's job. If the bundle itself turns out to be wrong, that should already have been caught before drafting ever started; this check assumes the bundle was correct and only asks whether the draft stayed faithful to it.

Available SOPs

Optional, no fixed order; the final leaf is always a sop.

SOP	When to use
spawn-agent	Spawn a customized CC subagent with full MCP tool access.