Bold questions

docs/claude-protocol.md

@@ -8,6 +8,7 @@ Transcripts (`Options.Transcript`) record every line in both directions as `{"di
 
 ```
 claude --output-format stream-json --input-format stream-json --verbose \
+  --include-partial-messages \
   --permission-mode bypassPermissions --allow-dangerously-skip-permissions \
   --settings '{"attribution":{"commit":"","pr":""}}' \
   --mcp-config '{"mcpServers":{"byre":{"type":"sdk","name":"byre"}}}' \
@@ -26,6 +27,7 @@ NDJSON both ways: one JSON object per line on stdin and stdout. Non-JSON stdout
 
 - User turn, written to stdin: `{"type":"user","message":{"role":"user","content":"..."},"parent_tool_use_id":null,"session_id":"..."}`.
 - Stdout events: `system` (subtype `init` carries `session_id`, `model`, tools, MCP server status), `assistant` and `user` (Anthropic message content blocks: `text`, `tool_use`, `tool_result`), `result` (ends a turn; `subtype` is `success` or `error_during_execution` after an interrupt, with cost, duration, turn count).
+- `--include-partial-messages` adds `stream_event` lines wrapping the raw API stream (`message_start`, `content_block_start`, `content_block_delta` with `text_delta`, `content_block_stop`, `message_delta`, `message_stop`), each with `parent_tool_use_id` (set inside subagents). The complete `assistant` event for a block still arrives, before that block's `content_block_stop`. Transcripts leave `stream_event` lines out.
 - The `init` event arrives with the first turn, not at launch, so the session ID is unknown until the first message is sent.
 
 ## Control channel
@@ -36,7 +38,8 @@ Host → CLI:
 
 - `initialize` must be first. It carries hook registrations: `{"hooks":{"Stop":[{"matcher":null,"hookCallbackIds":["hook_0"]}],...}}`.
 - `interrupt` ends the current turn; the turn's `result` follows almost immediately and a running Bash tool is killed. The session stays usable.
-- `set_model`, `set_permission_mode`, `mcp_status`, `get_context_usage`, `rewind_files`, `stop_task` exist and are not used yet.
+- `set_model` (`{"subtype":"set_model","model":M}`) switches the running process's model for later turns.
+- `set_permission_mode`, `mcp_status`, `get_context_usage`, `rewind_files`, `stop_task` exist and are not used yet.
 
 CLI → host: