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stephenvapiai merged 2 commits into from
Oct 14, 2026
Merged

docs: handoff carries only the destination's first system message #1322

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docs: handoff carries only the destination's first system message
chiranjeet-vapi Oct 14, 2026
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Merge branch 'main' into docs/handoff-first-system-message-only
stephenvapiai Oct 14, 2026
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4 changes: 4 additions & 0 deletions fern/squads/handoff/context-and-variables.mdx
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Expand Up @@ -9,6 +9,10 @@ A handoff carries **conversation messages** and **variable values** separately.

Values already collected in the call remain available to later assistants even if the destination receives no earlier messages.

<Note>
The destination's system prompt is the first `system` message in its `model.messages`. On a handoff, any additional `system` messages in that array are dropped, so combine all destination instructions into a single system message.
</Note>

## Context engineering

Set `contextEngineeringPlan` on an assistant or squad destination. It filters the messages sent to that destination; it does not clear saved variables.
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