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HomeDocsClaude Code CLI 9 Oct 2026
One change · claude-code

Stream responses in real-time changedagent-sdk/streaming-output

Nearest release: v2.1.296, published 6 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 9 Oct 2026 23:17 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 9 Oct 2026 23:37 UTC.

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### Handle a stream that's cut off

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115115Without partial messages enabled, you receive all message types except `StreamEvent`. Common types include `SystemMessage` (session initialization), `AssistantMessage` (complete content blocks), `ResultMessage` (final result), and a compact boundary message indicating when conversation history was compacted (`SDKCompactBoundaryMessage` in TypeScript; `SystemMessage` with subtype `"compact_boundary"` in Python).
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117### Handle a stream that's cut off
118 
119If a stream is cut off mid-message, such as when you interrupt the turn or the connection drops, you still receive that message's `message_stop` before the turn ends. A cut text or thinking block also gets its `content_block_stop`. A cut tool call doesn't, so if `message_stop` arrives while a tool call's block is still open, treat that call's input as incomplete.
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121Before Claude Code v2.1.290, a cut stream could end the turn without `message_stop`, so a reply you render from stream events could stay shown as in progress. The TypeScript Agent SDK bundles Claude Code v2.1.290 or later from v0.3.290, and the Python Agent SDK from v0.2.164. If a reply stays shown as in progress after the turn ends, update the SDK.
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117123## Stream tool calls
118124 
119125Tool calls also stream incrementally. You can track when tools start, receive their input as it's generated, and see when they complete. The example below tracks the current tool being called and accumulates the JSON input as it streams in. It uses three event types:
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