Previously ab_ai_mail.py intercepted file uploads before reaching the
LLM and responded with a hardcoded clarification template. The LLM had
no involvement in the file upload response.
Changes:
- ab_ai_mail.py: remove _post_file_clarification, _find_pending_attachments,
_describe_zip, and the two-step pending-attachment lookup. All messages
(text, files, or both) are dispatched to the agent service immediately.
Files with no text pass an empty message — the LLM decides what to do.
- upload.py: default message changed from hardcoded receipt instruction
to '' so the LLM determines intent from file content.
- master_agent._synthesize: always runs through the LLM for both single
and multi-agent cases — no raw templates reach the user.
- master_system.txt: add FILE UPLOADS routing rule so the LLM knows to
route receipts to expenses_agent without asking for clarification.
New flow: upload → parse → LLM classifies → agent acts → LLM synthesizes
natural response → user sees it. Zero scripted intercepts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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