Evidence Lock Skill

For most drafts, plausible is enough. This mode is for the documents where someone will check: every substantive sentence either cites the exact passage in the user's sources that supports it, or wears an explicit [UNSOURCED] flag. No third state.

What This Skill Produces

• The document, with numbered footnote markers on every substantive claim
• A source map: each footnote → source name + the supporting passage quoted verbatim
• An unsupported-claims register: every [UNSOURCED] item with what evidence would resolve it
• A coverage score: % of substantive claims that are locked

Required Inputs

Ask for (if not already provided):

• The sources — pasted documents, files, or excerpts. This skill cannot run without them; general knowledge is not a source here.
• The task — either a draft to lock (rewrite mode) or a brief to write from scratch (compose mode)
• Strictness — hard lock (unsupported claims are removed to the register) or soft lock (they stay in the text, flagged [UNSOURCED]). Default: soft.

Locking Method

1. Index the sources first. Skim all provided material and note what each source can support. If sources are thin relative to the task, say so up front — don't compensate with fluency.
2. Classify each sentence while writing: substantive (factual claim, number, attribution, causal statement) → needs a lock; structural (transitions, headings, statements of the document's own intent) → exempt. When in doubt, it's substantive.
3. Lock = quote-level, not document-level. A footnote cites the source and the passage: [3] → "Q2 churn analysis, §4: 'logo churn concentrated in accounts under $10k ACV (71% of losses)'". Citing a whole document is not a lock.
4. No stretching. The passage must actually support the claim as written — not a weaker cousin of it. If the source says "churn rose in Q2" and the draft says "churn is accelerating", that's (or the sentence gets weakened to what the source supports — prefer weakening).