Skills
Know the difference between compaction and agentic memory — and use both deliberately
Compaction trims what's already in the context window (Anthropic productized a server-side compaction API on Opus 4.6 that auto-summarizes older turns into a compressed state mid-session), while agentic memory moves information entirely outside the context as structured notes the agent writes and pulls back on demand. Conflating the two leaves long-horizon agents either losing critical state to summarization or drowning in context they should have offloaded. Use compaction to manage window pressure and note-taking memory to preserve progress across dozens of tool calls and context resets.
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