feat(agent-core): replace asChild boolean with an explicit session role enum - #451
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WinterYukky merged 2 commits intoAug 24, 2026
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…Session tool Replace the binary asChild parameter with a three-value role enum: - 'child': Sub-task of the current session (replaces asChild=true) - 'successor': Hand over to a fresh parent session, re-parenting the current session and all its children under the new one - 'independent': Completely separate session (replaces asChild=false) The successor role enables session handover (引き継ぎ): when an agent's context grows too large or the user explicitly requests a handover, it can spin up a fresh coordinator that inherits the full session tree. Supporting changes: - Add reparentSessions() to sessions.ts with cycle detection, self-parent guard, and DDB TransactWrite (bounded at 100 items) - Add sessionReparented webapp event for real-time sidebar updates - Add handedOverTo field to SessionItem schema (idempotency guard for concurrent handover attempts)
The tool description and role guidance are user-facing prompt strings in the public upstream, so remove the stray non-English term and keep the handover wording consistent in English. No behavioural change (8 tests pass).
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Summary
Replace the boolean
asChildparameter of the createNewSession tool with anexplicit
roleenum (child|successor|independent), and add thesession-reparenting plumbing the
successorrole needs.Motivation
A single boolean could not express the three distinct relationships a new session
can have with the current one. An explicit enum makes intent unambiguous in the
tool schema, enables the successor/handover flow (re-parent the current session
and its children under a fresh parent), and keeps independent sessions clearly
separate.
Changes
asChildfor theroleenum; expand the tool description and role guidance.reparentSessionsto move a setof child workers under a new parent.
event types for the role + reparenting.
Testing
(tsc + prettier + vitest).
Notes
successorflow introduced here — merge this first.
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