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b62ed6a2f4
Adds the agent-as-tool capability deferred in turn-runtime-design §29.2:
a `spawn-agent` builtin that runs a sub-agent in its own standalone
headless turn and returns its final answer to the parent. Multiple
spawn calls in one assistant batch run concurrently (previous commit).
- RequestedAgent is now a union: by-id (unchanged shape) | inline
{name, instructions, model?, tools?}. Inline definitions persist
verbatim in turn_created and resolve to the same immutable snapshot.
- Agent resolution splits by variant: DispatchingAgentResolver narrows
the union once; InlineAgentResolver materializes inline specs
(builtin catalog validation, headless default profile when tools are
omitted); RealAgentResolver keeps the by-id path byte-identical. The
builtin→ToolDescriptor conversion is extracted to a shared helper.
- The spawn handler (RealToolRegistry branch → runSpawnedAgent) runs
the child via HeadlessAgentRunner on the parent's model by default,
clamps the model-call budget at 20, cascades the parent's abort
signal, and records {kind:"subagent", childTurnId} as durable tool
progress — the only parent→child link; no parentTurnId is added to
the schema. Task-level failures return as conversational isError
results, never terminal.
- Depth is capped at 1: both resolvers strip spawn-agent from children
(inline always; by-id via the new subagent composition flag) and the
handler refuses child-shaped parents outright.
- Renderer: spawn-agent calls render as a SubAgentBlock — a collapsed
status card that expands to the child's live transcript
(CompactConversation over sessions:getTurn, polled at 1s while
running; standalone child turns don't reach the session bus).
- The BuiltinTools entry gives copilot (and other catalog-attached
agents) the tool automatically; its execute is the degraded legacy
path only, since the turn runtime intercepts builtin:spawn-agent.
Schema note: RequestedAgent widened under schemaVersion 1 (pre-release)
— requires wiping ~/.rowboat/storage.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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