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Part 5: On-Demand Context — Skills & Agents

NOTE

Expanded only when called. Skills are "import"; Agents are "delegation to separate process."

Why They Exist

Resident context (CLAUDE.md) and conditional context (Rules) alone cannot provide task-specific detailed procedures. Skills and Agents are mechanisms that "provide only the necessary knowledge when needed."

Fundamental Difference Between Skills and Agents

Main Claude (context window)
  ├─ Skill loaded → executed in same context (consumes context)
  │               → equivalent to import / require
  │
  └─ Agent launched
       └─ separate context window (independent)
          → only result returned to main (distilled summary)
          → equivalent to delegation to separate process

→ Why: Which Structural Problems Do They Address?

IMPORTANT

• Context Rot: Skills expand only when needed. Agents fundamentally avoid it with independent context
• Sycophancy: Cross-model QA via Agents eliminates compliance bias
• Knowledge Boundary: Delegate specific domains to specialist Agents, narrowing knowledge boundaries
• Prompt Sensitivity: Improve auto-invocation accuracy through Skill description design

Documents in This Part

Document	Content
Skills Design Principles	How to write SKILL.md, importance of description
Agents Design Principles	Independent context, Cross-model QA
Criteria for Skill vs Agent	Decision flow for which to use

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Previous: Part 4: Conditional Context

Next: Part 6: Context as Tool Definition