WFGY/ProblemMap/GlobalFixMap/Multimodal_LongContext/boundary-fade.md

Boundary Fade — Guardrails and Fix Pattern

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When multimodal long-context windows extend, boundaries between modalities or section joins blur.
This causes models to conflate captions, transcripts, or visuals across neighboring regions, producing hybrid outputs or lost anchors.

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Symptoms of Boundary Fade

• Captions merge into adjacent paragraphs, citations drift by a few lines.
• Visual snippets spill across sections, losing clear demarcation.
• ΔS across joins rises above 0.50, meaning semantic leakage.
• Output shows partial traces of two anchors instead of one.
• “Memory fade” across session restarts, context joins feel smeared.

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Open these first

• Join stability and chunk fences: Chunking Checklist
• Attention variance and entropy melt: Entropy Collapse
• Context drift at long horizon: Context Drift
• Visual trace schema: Cross-Modal Trace
• Session state guards: Memory Coherence

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Fix in 60 seconds

1. Measure joins

   • Compute ΔS across each modality join. Threshold ≤ 0.50.
   • If higher, suspect boundary fade.

2. Enforce fences

   • Insert {section_start} and {section_end} markers explicitly.
   • Require mod_type label (e.g., [image], [caption], [audio]).

3. Stabilize variance

   • Apply BBAM clamp when variance spikes near joins.
   • Use BBCR bridge to redirect reasoning back to the intended anchor.

4. Audit output

   • Each snippet must map to a single anchor ID.
   • Reject blended outputs that merge two snippet IDs.

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Acceptance Targets

• ΔS(question, retrieved) ≤ 0.45 overall.
• ΔS across joins ≤ 0.50.
• λ_observe convergent across three paraphrases.
• No section bleed: one snippet → one anchor only.

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Copy-paste prompt

You are running TXTOS + WFGY Problem Map.

Symptom: section or modality boundaries blur (“boundary fade”).

Protocol:
1. Compute ΔS across joins, enforce ≤ 0.50.
2. Insert section_start and section_end markers.
3. Require mod_type labels for all snippets.
4. Apply BBAM clamp, BBCR bridge if joins collapse.
5. Verify each snippet maps to exactly one anchor ID.

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Explore More

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WFGY Core	Canonical framework entry point	View
Problem Map	Diagnostic map and navigation hub	View
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Recognition	Where WFGY is referenced or adopted	View
AI Guide	Anti-hallucination reading protocol for tools	View

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