fix(launch-subagent): inherit parent session group by default

[petitcl]

Problem

When a sub-agent is spawned via launch-subagent.sh from a session that belongs to a specific group, the new session lands in the default group instead. This makes it hard to find the sub-agent alongside its parent in the TUI — they end up in different groups.

Example: parent session is in group "Others", spawned sub-agent lands in "clement.petit" (the profile default).

Root cause

The script already calls agent-deck session current --json, which includes the group field. It reads session, profile, and path from that JSON, but never reads group, so -g is never passed to agent-deck launch.

Fix

Extract the parent session's group from the existing JSON call and pass it to agent-deck launch with -g when present.

+PARENT_GROUP=$(echo "$CURRENT_JSON" | jq -r '.group // empty')
 
 LAUNCH_CMD=(agent-deck -p "$PROFILE" launch "$WORK_DIR" -t "$TITLE" --parent "$PARENT" -c "$TOOL" -m "$PROMPT")
+[ -n "$PARENT_GROUP" ] && LAUNCH_CMD+=(-g "$PARENT_GROUP")

The // empty guard means sessions with no group set are unaffected.

Test plan

• Spawn a sub-agent from a session in a named group; confirm the sub-agent lands in the same group
• Spawn a sub-agent from a session with no group; confirm behavior is unchanged

Example of a sub-agent launched from the group "Others" and configured to keep the parent group, vs another agent also launched from "Others", but which doesn't respect the parent group.

Summary by CodeRabbit

• Features
  • Sub-agent launches now inherit group context from parent sessions, enabling consistent configuration across related agent instances.

[coderabbitai]

📝 Walkthrough

Walkthrough

The launch-subagent.sh script is updated to read the parent session's optional group field and, when present, forward it to the child sub-agent launch command via the -g argument, allowing the spawned session to inherit the parent's group context.

Changes

Sub-agent group context

Layer / File(s)	Summary
Group context propagation to sub-agent skills/agent-deck/scripts/launch-subagent.sh	Script extracts the parent session's optional group value from agent-deck session current --json and conditionally appends -g "$PARENT_GROUP" to the child launch command.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A sub-agent takes flight,
Group context shining bright,
Parent passes down the way,
Children inherit, come what may! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix(launch-subagent): inherit parent session group by default' directly and clearly describes the main change: making sub-agents inherit their parent session's group, which is exactly what the changeset implements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 0