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Optional referenceRevised October 2026

Subagents & Prompt Caching
Reference.

Supporting procedures and worksheets. Return to the main talk

David Budáč
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2
In practice

A cache marker is not a cache guarantee

{ "type": "text", "text": "stable invoice rules and schema", "cache_control": {"type": "ephemeral"} }

Claude block example. Eligibility, placement, earlier writes and lifetime still matter.

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3
In practice

Place breakpoints around real reuse

  • Mark stable boundaries that requests actually share.
  • A later change can preserve an earlier cached entry if a write exists there.
  • Do not assume lookup creates earlier entries that were never written.

See the current lookup and breakpoint limits.

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4
In practice

Choose the supported client and credential path

Native Claude Code use

Sign in through the official flow under the applicable plan and usage rules.

Your product or service

Use API-key authentication or a supported cloud-provider route.

The boundary is not simply “human at keyboard” versus “automation”. Current authentication guidance