Anthropic Release Memory API

Summary

Today, we’re introducing new capabilities for managing your agents’ context on the Claude Developer Platform: context editing and the memory tool.With our latest model, Claude Sonnet 4.5, these capabilities enable developers to build AI agents capable of handling long-running tasks at higher performance and without hitting context limits or losing critical information.Context windows have limits, but real work doesn’tAs production agents handle more complex tasks and generate more tool results, they often exhaust their effective context windows—leaving developers stuck choosing between cutting agent transcripts or degrading performance. Context management solves this in two ways, helping developers ensure only relevant data stays in context and valuable insights get preserved across sessions.Context editing automatically clears stale tool calls and results from within the context window when approaching token limits. As your agent executes tasks and accumulates tool results, context editing removes stale content while preserving the conversation flow, effectively extending how long agents can run without manual intervention. This also increases the effective model performance as Claude focuses only on relevant context.The memory tool enables Claude to store and consult information outside the context window through a file-based system. Claude can create, read, update, and delete files in a dedicated memory directory stored in your infrastructure that persists across conversations. This allows agents to build up knowledge bases over time, maintain project state across sessions, and reference previous learnings without having to keep everything in context.The memory tool operates entirely client-side through tool calls. Developers manage the storage backend, giving them complete control over where the data is stored and how it’s persisted.Claude Sonnet 4.5 enhances both capabilities with built-in context awareness—tracking available tokens throughout conversations to ...