feat(subagents): show the model and effort provider-native subagents run with - #343
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…run with Subagent items now carry optional `model` and `effort`, merged like `summary` so later lifecycle snapshots never erase them. Claude: the Agent tool's `model` alias is recorded at spawn; the resolved model and effort are read from the child's assistant records, both when they stream over stdout with `parent_tool_use_id` and when a background task's transcript is tailed (the tail hands the values back to the actor so the re-emitted spawn item keeps its live status). Codex: `spawn_agent`'s `model` / `reasoning_effort` overrides are used when present, otherwise the child inherits the parent thread's settings. The subagent row renders a `model · effort` chip next to the agent type.
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enabled auto-merge (squash)
September 6, 2026 16:55
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Summary
ItemContent::Subagentgains optionalmodel/effort(serde-defaulted, merged likesummaryso later lifecycle snapshots never erase them).modelalias at spawn, then updates with the resolvedmessage.modeland top-leveleffortfrom the child's assistant records. Covers both stdout child messages (parent_tool_use_id) and tailed background-task transcripts; the tail hands values back to the actor so the re-emitted spawn item keeps its live status instead of racing completion.spawn_agent'smodel/reasoning_effortoverrides when present, otherwise the child inherits the parent thread's model and effort (the app-server does not forward the child's turn context).model · effortchip after the agent type. Old logs without the fields render exactly as before.Test plan
cargo clippy --workspace --all-targets -- -D warningscargo test -p agent -p tcode-core -p tcode-runtime -p tcode-ui -p tcode-servicesmodel+effort; Codex activity test asserts override + inherited fallback.