Plugins can now add or update session instructions without editing the system promptThe standing instructions a model receives before any user input — defining its role, rules, tools, and tone for the whole conversation.Full definition →, so the prompt cache stays valid and entries survive context compactionSummarizing an agent's earlier conversation to free room in the context window so a long session can keep going.Full definition →. Configurable cache TTLs per provider help control cost on long sessions.
Terms in this piece · Glossary
system prompt — The standing instructions a model receives before any user input — defining its role, rules, tools, and tone for the whole conversation.
context compaction — Summarizing an agent's earlier conversation to free room in the context window so a long session can keep going.
