feat(agentic): stabilize prompt cache reuse across skill and subagent updates#985
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…fix cache - snapshot turn-level skill and subagent listings to preserve the first-turn prompt baseline - inject incremental skill and agent listing updates into user input instead of rebuilding cached prefixes - persist and recover skill-agent snapshots across restore and rollback flows to keep prompt state consistent
- replace prompt-envelope reminder wrapping with explicit prepended reminder messages across coordinator, scheduler, goal mode, cron, /btw, init_agents_md, and session_message flows - add InternalReminderKind metadata and constructors so reminder messages can be classified, persisted, and filtered consistently, including fork-subagent and goal-continuation paths - persist a listing-baseline rebuild cutoff in session metadata and lazily strip stale skill/agent listing diff reminders when restoring or rolling back older context snapshots - teach fallback compression to drop transient reminder kinds and update related tests after removing legacy envelope-based expectations
…prompt cache reuse - document session-level prompt cache reuse strategy and persistence - document reuse across branching, /btw, fork_context, mode switching, and compression - clarify current per-turn tool-manifest cache-miss gap and a possible future direction - make hidden /btw child sessions clone the parent prompt cache on creation
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Summary
This PR improves agentic prompt-cache stability when skills, subagents, reminders, and session flows change at runtime.
What changed
/btwchild sessions inherit the parent prompt cache on creation<user_query>tagsWhy
Previously, dynamic skill/subagent changes or reminder rebuilding could invalidate cached prompt prefixes or create noisy diff/update behavior. This PR makes runtime updates more incremental and keeps prompt-cache state consistent across branching,
/btw, mode switching, restore/rollback, and compression paths.