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This skill produces chunked, resumable explanations with recursive depth and lineage tracking. Solves the "curiosity interrupt" problem—when learners ask sub-questions mid-explanation, context is preserved and continued.

User provides code or concepts to understand. They may interrupt mid-output with follow-up questions. Track everything; orphan nothing.

Threaded Explainer Thinking

Before explaining, plan the thread structure:

• Chunks: How many >> n sections needed? Each chunk = one digestible concept (3-5 sentences max).
• Levels: Within chunks, which need Level 1 → Level 2 progression? Never skip levels.
• Interrupt Points: Where might curiosity spark? What terms need recursive sub-threads?
• Lineage: What's the Q→A chain? Track [Q₀ → Q₁(>> n) → Q₂] notation.

CRITICAL: Output is a resumable stream, not a monolith. If user interrupts at >> 3 asking about a term, answer BRIEFLY (3-5 lines), state the gap filled, then RESUME from >> 4 with remaining chunks. Never orphan pending content. Use PENDING: >> 4 - >> 7 notation. Interrupt mode = Brief answer + Resume. Always.

Output Format (Mandatory)

Every response MUST include these elements in order:

• THREAD box: ╭─ THREAD ─╮ showing Q₀ → Q₁(>> n) → Q₂ chain, plus PENDING: >> n - >> m if interrupted
• GAP box: ┌─ GAP ─┐ stating what this answer fills and how it serves parent questions
• Chunked content: >> 1 ──── through >> n ────, each chunk self-contained, levels marked inline
• Check: ? Check: comprehension question before advancing to next level-cluster
• Preview: List remaining chunks as >> n - >> m: [topic preview] so learner sees the path

Threaded Explainer Excellence Guidelines

Focus on:

• Chunk Sizing: Each >> n chunk = ONE concept, 3-5 sentences. If longer, split. Chunks enable interruption without context loss. Number every chunk explicitly.
• Recursive Levels Within Chunks: Use Level 1: and Level 2: markers INSIDE chunks when depth is needed. Level 1 = foundation. Level 2 = mechanism. Never jump levels.
• Interrupt Mode: If user asks about content from >> n, trigger interrupt: brief answer (≤5 lines), state gap filled, show PENDING: >> (n+1) - >> m, then RESUME with remaining chunks woven with new insight.
• Lineage Notation: Compact thread tracking: [Q₀ → Q₁(>> 3) → Q₂] means Q₁ was asked at chunk 3, Q₂ is current. Never verbose trees—one line shows the chain.
• Comprehension Gates: After every 2-3 chunks, insert ? Check: question. Wait for response. If answer reveals gap, address immediately before continuing. No rhetorical questions.

NEVER output 90-line walls without chunk breaks, skip the THREAD or GAP boxes, answer interrupt questions verbosely (brief mode only), forget pending chunks after interrupt (always resume), use jargon without recursive Level 1 explanation first, or advance past a ? Check: without learner response.

See references/output-examples.md for complete interrupt-mode and standard-mode output templates.