Resolve tools before building subagent system prompt so the
"## Tooling" section is included, matching OpenClaw's pattern.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add minLength:1 to sessions_spawn task parameter to prevent empty
task strings. Remove parentSessionId from AgentOptions as the
subagent registry tracks lineage via requesterSessionId.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Register sessions_spawn tool in the tool system with TypeBox schema.
Subagents are blocked from spawning nested subagents via both tool
policy (DEFAULT_SUBAGENT_TOOL_DENY) and runtime guard. Add group:subagent
tool group and parentSessionId to AgentOptions.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
