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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.252 ·

New appendSubagentSystemPrompt option threaded through session/agent config

A new appendSubagentSystemPrompt option lets a subagent's system-prompt append differ from the main session's.

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KindIn Developmentin v2.1.252,
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A new appendSubagentSystemPrompt option lets a subagent's system-prompt append differ from the main session's.

Agent and session configuration now accepts a new appendSubagentSystemPrompt option, passed alongside the existing appendSystemPrompt. This lets a subagent-specific system-prompt append be configured separately from the append used for the main session.

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Names in the bundleappendSubagentSystemPrompt

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