User Story:

As a form filler (Carlos), in order to navigate complex conditional sections without confusion, I want to complete those sections through a conversational agent that explains questions, adapts the flow, and collects my answers

Preconditions:

• A published form exists with at least one section marked as conversational delivery mode (Slice 3)
• Static form filling works (Slice 5)

Acceptance Criteria:

• Sections marked as conversational in the FormSpec render as a chat interface instead of a static form
• The conversational agent asks questions in a natural order based on the DataCollectionSpec
• Agent skips irrelevant questions based on prior answers (evaluates conditions)
• Agent explains why data is needed when asked
• Agent flags sensitivity before collecting PII fields
• Collected answers are stored in the same Submission format as static form data
• Carlos can switch between conversational and static views for the same section
• Conversation state is preserved if Carlos navigates away and returns

Success Metrics:

• Completion rate for conversational vs. static sections
• User satisfaction (qualitative feedback)
• Correctness: conversational agent collects all required fields

Notes:

• Same DataCollectionSpec, different delivery experience — demonstrates the delivery spectrum
• Agent uses tool calls: collect_field, explain_field, skip_section
• CollectionState tracks: {field_name: value | null} for all fields in the section
• This is the filling agent pattern from the design spec

Definition of Done:

• Acceptance criteria met
• Threat model updated -- any new trust boundaries, data flows, or attack surfaces are reflected in catalog/architecture/threat-model.md
• Technical documentation updated -- architecture docs and decisions are current
• Filling agent has interface abstraction (swappable implementations)
• Tests pass
• Type checking passes
• CI pipeline green
• Deployed and demoable