feat(agent): restructure context compression handoff - #1903
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Conversation
- unify manual and automatic compression through a shared token-budgeted plan - retain historical user messages before the summary and preserve the exact recent context suffix - keep tool call and result groups atomic when selecting recent context - add a dedicated continuation reminder and replace stale reminders during recompression - refine the compaction prompt and summary assembly for concise task handoffs - retry context overflows using the next complete atomic message boundary
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Summary
min(20k, context_window * 10%).Fixes #
Type and Areas
Type:
Feature / refactor
Areas:
Rust core, agent session compression, agent execution
Motivation / Impact
The previous compression flow depended on the model to reproduce user messages and handled manual and automatic compression differently. It also used turn anchors and boundary reminders when the recent-context cutoff split a turn.
This change uses locally available conversation data to retain historical user messages, summarizes only the prefix before the cutoff, and preserves the suffix exactly. Manual and automatic compression now share the same behavior, reducing duplicated logic and making the post-compression context structure more predictable.
Verification
pnpm run fmt:rscargo test -p bitfun-core agentic::session::compression::compressor::tests --libcargo check --workspace