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docs(rfd): move client system prompt to preview - #2739
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Clients must not send an empty systemPrompt content array, and Agents may reject one. Records the Claude Agent and Codex adapter implementations and fixes the v1 mode field description.
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Moves the Client-Provided System Prompt RFD to Preview.
Changes
systemPrompt.contentarray, and Agents MAY reject one with-32602. This matches the emptypromptrule onsession/prompt. Updated in the RFD, both draftsession-setupguides, and the v1/v2contentdoc comments. Adds an FAQ entry explaining that removing a prompt from an existing session is out of scope.append+override) and the Codex adapter (#653, v2.3.0,append).agentclientprotocol/codex-acpand marks the "does not expose a prompt" statements as historical.SystemPrompt.modedescription ("In Rust,\nUnknown\nvalues are preserved") using the v2 wording.docs.json.The feature stays behind
unstable_session_system_prompt. No wire changes.npm run generateandnpm run checkpass.