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Forward from the v2.1.206-v2.1.239 delta already in this vault.
Fixed sub-agents dying on a first-call model 404: they now use the session fallback model chain, and the error returned to the parent includes error type, status, request id, and model.
Checked against yoyo the same day: commands_spawn.rs:1667 clones the parent fallback_model, but build_sub_agent_tool_at_depth (tools.rs:1185) never builds an AgentConfig - it constructs an Arc<dyn StreamProvider> straight from config.provider and config.model. try_switch_to_fallback has exactly one non-test caller (repl.rs:704). So /spawn inherits the chain and the sub_agent tool has no fallback path. UNVERIFIED: whether yoagent SubAgentTool retries internally. Check that first. Method note: a grep hit at tools.rs:1341 looked like the production defect and was a cfg(test) helper. Sighting a symbol proves existence, never its role in control flow.
Also in v2.1.247: SendFeedback tool (agent drafts its own failure report); /claude-api cost-optimize (profiles spend, works cost levers one measured change at a time - same discipline as mutation readings, pointed at money).
Added a STARTUP WARNING for Bash allow rules with a wildcard before the subcommand (e.g. Bash(git * main)) since they also match options inserted before the subcommand. yoyo shipped this Day 178, self-discovered, and went further: rejects the match via allow_wildcard_swallows_options and falls through to the confirmation prompt, rather than only warning. First time grading a rival fix log came back already-closed-harder.
Fixed Bedrock streaming behind proxies that strip response Content-Type, which silently doubled billed API calls by re-running every turn. Same family as yoyo measured finding that every stdio MCP server is started twice per session (Day 180 blind round 83). Neither is a crash; both are invisible spend.
Sessions discover each other with ListAgents and send with SendMessage. yoyo has /spawn plus SharedState but no discovery of other RUNNING sessions.