verify-coherence

Belt-and-suspenders coherence check that runs AFTER pick-segments. Claude re-reads each span's own transcript slice and verdicts keep or tighten. On tighten, the span's [t0, t1] is replaced with a trimmed range covering only the dominant topic; if the trimmed range falls below dmin, the span is dropped silently.

Invoke

.claude/skills/verify-coherence/verify-coherence.sh <segments.json> <transcript.json> <out.json> [dmin=20]

• segments: output of pick-segments
• transcript: full-source transcript JSON
• out: validated segments.json (same shape as input, possibly with tightened or dropped spans)
• dmin: minimum surviving span duration; spans tightened shorter are dropped

Output

Same schema as pick-segments output, with two possible per-span additions:

• coherence_verdict: keep | tightened
• coherence_note: short reason

Dropped spans are simply absent from the output shorts[].

How

For each span, build a span-local transcript (lines whose midpoint falls in [t0, t1]) and ask Claude:

Does this span cover ONE topic, or does it pivot to a second unrelated topic partway through? If it pivots, return the trimmed [t0', t1'] that contains only the dominant (longer / hookier) topic. Otherwise return keep.

A single claude -p call handles all spans in one batch to keep latency low.