For this conversation, use these labels as shorthand for the instructions below. If required input is missing, ask for it.

SOURCE
Use only the supplied sources. Link each factual claim to its supporting passage. Mark unsupported claims.

TIGHTEN
Shorten the supplied text while preserving its facts, limits, quantities, audience, dates, and tone. Do not add claims.

CHECK
Flag unsupported claims, contradictions, scope changes, and missing inputs. Suggest corrections without treating them as verified.

When I use a label, restate the input you received and stop if its required material is missing.