Fix Claude provider dropping the CoC system message#309
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plusplusoneplusplus merged 1 commit intoJun 10, 2026
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ClaudeSDKService passed customSystemPrompt/appendSystemPrompt to
query(), but @anthropic-ai/claude-agent-sdk >= 0.1 only reads the
unified systemPrompt option and silently discards the legacy keys,
so every CoC-authored system message (ask-mode read-only
instructions, repo instructions, memory guidance) never reached
Claude and sessions ran with an explicitly empty system prompt.
Map mode 'append' to systemPrompt { type: 'preset', preset:
'claude_code', append } (Claude Code default prompt plus CoC
instructions) and mode 'replace' to a custom string systemPrompt;
blank or absent content still omits the field. Verified at the wire
level that the initialize control request now carries the appended
content, while the old shape produced systemPrompt [""] with the
instructions dropped.
Tests cover append/replace mapping, blank/absent omission, resumed
sessions, and regression assertions that the ignored legacy options
are never sent.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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ClaudeSDKService passed customSystemPrompt/appendSystemPrompt to
query(), but @anthropic-ai/claude-agent-sdk >= 0.1 only reads the
unified systemPrompt option and silently discards the legacy keys,
so every CoC-authored system message (ask-mode read-only
instructions, repo instructions, memory guidance) never reached
Claude and sessions ran with an explicitly empty system prompt.
Map mode 'append' to systemPrompt { type: 'preset', preset:
'claude_code', append } (Claude Code default prompt plus CoC
instructions) and mode 'replace' to a custom string systemPrompt;
blank or absent content still omits the field. Verified at the wire
level that the initialize control request now carries the appended
content, while the old shape produced systemPrompt [""] with the
instructions dropped.
Tests cover append/replace mapping, blank/absent omission, resumed
sessions, and regression assertions that the ignored legacy options
are never sent.
Co-Authored-By: Claude Fable 5 noreply@anthropic.com