overview changedbuild-with-claude/overview
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8989| ↳ [Memory tool helpers](https://platform.claude.com/docs/en/agents-and-tools/tool-use/memory-tool#implement-the-memory-handler) | SDK helpers that handle the memory tool’s interface and tool-use loop, so your code supplies only the storage. |
9090| [Message streaming](https://platform.claude.com/docs/en/build-with-claude/streaming) | Receiving a Messages API response incrementally, as server-sent events, while it is generated. |
9191| ↳ [Fine-grained tool streaming](https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming) | Streams a tool’s input to your client as Claude writes it, without the server first buffering and checking the JSON. |
92| [Message threads](https://platform.claude.com/docs/en/build-with-claude/message-threads) | Give long-running agents a faster time to first token, especially in long conversations, by sending only the new messages on each request. |
9293| [On-demand compaction](https://platform.claude.com/docs/en/build-with-claude/compaction-on-demand) | Replaces the earlier messages of a conversation with a summary that Claude writes when your application asks for it. |
9394| ↳ [Background compaction](https://platform.claude.com/docs/en/build-with-claude/compaction-background) | Runs the on-demand compaction request while the conversation continues on its full history, then swaps in the summary when it arrives. |
9495| ↳ [Compaction and preserved thinking](https://platform.claude.com/docs/en/build-with-claude/compaction-thinking-blocks) | Thinking blocks in the turns you keep after on-demand compaction can stay valid, under stated conditions, on models with preserved thinking. |
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