{"schema_version":"newruntime-agent-readable-v0.2","type":"raw_signal","stable_id":"signal:prompt-caching-turns-context-into-infrastructure","id":"nr-7f814d23-prompt-caching","slug":"prompt-caching-turns-context-into-infrastructure","title":"Prompt Caching Turns Agent Context Into Infrastructure","description":"Earendil frames prompt caching as an agent systems primitive, where stable context becomes a cost, latency, and architecture concern.","retrieval_nugget":"Earendil frames prompt caching as an agent systems primitive, where stable context becomes a cost, latency, and architecture concern. Long-lived agents carry stable instructions, tools, schemas, and project context. Caching that layer changes latency economics and encourages cleaner separation between persistent context and per-task deltas. Novelty is structural; verification is source-linked. This New Runtime record is an evidence-linked retrieval unit.","observed_at":"2026-07-29","record_date":"2026-07-29","date_kind":"observed_at","why_it_matters":"Long-lived agents carry stable instructions, tools, schemas, and project context. Caching that layer changes latency economics and encourages cleaner separation between persistent context and per-task deltas.","novelty":"structural","verification_level":"source-linked","signal_type":"operating-model","evidence_kind":"primary-source","status":"published","source_platform":"newsletter","source_record_id":"7f814d23-prompt-caching","source_url":"https://earendil.com/posts/prompt-caching/","topics":["ai-infrastructure","coding-agents"],"entities":["Earendil","prompt caching","agents"],"related_patterns":["harness-architecture-outlives-model-choice","agent-economics-moves-to-completed-work","agent-ready-software-exposes-capabilities"],"source_urls":["https://earendil.com/posts/prompt-caching/"],"import_batch":"newsletter-7f814d23-9a63-4cfa-98a1-ef53e872d6e5","routes":{"html":"https://newruntime.com/signals/prompt-caching-turns-context-into-infrastructure/","markdown":"https://newruntime.com/signals/prompt-caching-turns-context-into-infrastructure.md","json":"https://newruntime.com/signals/prompt-caching-turns-context-into-infrastructure.json"},"source_format":"editorial-inbox-sanitized-batch","next_reads":[{"type":"pattern","path":"/patterns/harness-architecture-outlives-model-choice/","reason":"Pattern connected to this observed signal.","url":"https://newruntime.com/patterns/harness-architecture-outlives-model-choice/","title":"Harness architecture outlives model choice","media_type":"text/html"},{"type":"pattern","path":"/patterns/agent-economics-moves-to-completed-work/","reason":"Pattern connected to this observed signal.","url":"https://newruntime.com/patterns/agent-economics-moves-to-completed-work/","title":"Agent economics moves to completed work","media_type":"text/html"},{"type":"pattern","path":"/patterns/agent-ready-software-exposes-capabilities/","reason":"Pattern connected to this observed signal.","url":"https://newruntime.com/patterns/agent-ready-software-exposes-capabilities/","title":"Agent-ready software exposes capabilities","media_type":"text/html"},{"type":"topic","path":"/topics/ai-infrastructure/","reason":"Explore the ai infrastructure topic hub.","url":"https://newruntime.com/topics/ai-infrastructure/","title":"AI Infrastructure - New Runtime","media_type":"text/html"},{"type":"topic","path":"/topics/coding-agents/","reason":"Explore the coding agents topic hub.","url":"https://newruntime.com/topics/coding-agents/","title":"Coding agents - New Runtime","media_type":"text/html"}]}