Two bugs caused all 5 interim blocks to fail with "Claude CLI failed
(exit 1): unknown error":
1. source_context was embedded BOTH inside the prompt template (via
{source_context}) AND prepended again in write_block — doubling every
block's context size (232K chars × 2 = 465K chars).
2. _build_source_context loaded all 9 case documents for every block
regardless of relevance.
Fixes:
- Remove the duplicate source_context prepend in write_block; the
template already contains it via {source_context}
- Add per-block document filtering (_BLOCK_DOC_TYPES): block-he/zayin →
empty, block-chet → protocol only, block-tet → appraisals only
- Add 400K char guard before calling claude -p with a descriptive error
(vs opaque "exit 1: unknown error")
- Add prompt-size warning and size info in claude_session error messages
Result: block-he 0 chars, block-zayin 0 chars, block-vav ~172K,
block-chet ~45K, block-tet ~300K (all under 400K limit)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Chaim
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