Smaller Context, Recoverable History: Inside an Agent Memory Handoff
A memory handoff replaces a large conversation window while keeping retained source segments available for recall. The goal is to reduce how much history the LLM has to carry in its active context, while preserving the information it can recover when needed. That goal is different from shrinking a database. Keeping exact source text outside the prompt can be the right trade-off: the model stops…
A technique replaces large conversation windows with smaller handoffs, while still allowing the model to recall the relevant information when needed. This approach reduces the amount of historical context the LLM needs to retain, instead of storing the entire context in the active prompt. The retained source segments can be recovered later if necessary.
The implementation involves three decisions for each conversation window: KEEP the exact text in external storage, COMPRESS it into a reduced representation alongside the exact source, or DROP it completely. Once the retained material is handed off, the window leaves the active context. The handoff contains a navigation summary, manifest identifier, content hashes, and instructions for retrieving the omitted material.
The implementation was tested on 10,241 completed runs, where the selected source windows contained a total of 1,137,387,720 characters, while the handoffs contained only 15,375,395 characters—resulting in a 98.65% reduction in the replaced portion of context. All retained segments maintained exact text with valid hashes, and the retrieval calls were made by a test harness, not autonomously by an agent.
The operational measurements showed that even with only KEEP decisions, the active context could be substantially reduced, retaining information externally instead of presenting it repeatedly to the LLM. The planner smoke test demonstrated a 97.67% reduction in a 24-message window, with all segments retained verbatim and exact segment hashes valid.
The handoff summary was a navigation aid, not intended to contain all facts from the discarded window.
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