agent_registry_update of the orchestrator's subagents allowlist does not reach the spawn_async_subagent enum #6934

Summary

Updating the orchestrator's subagents.allowlist through openhuman.agent_registry_update persists in the registry but never reaches the spawn_async_subagent tool: its agent_id enum keeps the compiled default list, even after a core restart, so a registered custom sub-agent cannot be delegated to.

Problem

Headless openhuman-core serve 0.64.10. Steps:

1. openhuman.agent_registry_create_custom with id: "researcher" (tool allowlist web_search_tool, web_fetch, tool_search). agent_registry_list shows it, source: custom.
2. openhuman.agent_registry_update with id: "orchestrator" and subagents: {allowlist: [<the ten defaults>, "researcher"]}. agent_registry_get returns the eleven-entry allowlist.
3. Restart the core.
4. In a chat turn, ask the orchestrator to call spawn_async_subagent with agent_id: "researcher".

Result, verbatim from the tool:

invalid arguments for tool `spawn_async_subagent`: validation error: tool `spawn_async_subagent` arguments.agent_id must be one of the declared enum values; expected schema: {"properties":{"agent_id":{"description":"Sub-agent id (only these are dispatchable from here).","enum":["agent_memory","flow_discovery","image_agent","presentation_agent","profile_memory_agent","skill_setup","task_manager_agent","video_agent","vision_agent","workflow_builder"],...

Expected: the enum (and execute's allowlist check) follow the registry's current subagents.allowlist for the orchestrator, or the docs state that default agents' delegation policy is fixed and point at the supported way to let the orchestrator reach a custom agent.

Where it comes from, as far as I can tell: agent/registry/defaults.rs builds subagents: AgentSubagentPolicy::from_allowlist(def.subagents ...) from the compiled harness definition, and agent/orchestration/tools/spawn_async_subagent.rs::scope_spawn_async_subagent_spec scopes the enum from that definition; the registry override is not consulted at session build.

Solution (optional)

Resolve the parent's subagents policy from the registry snapshot (custom overrides win over defaults) when building the session's tool specs, the same way tool_allowlist overrides are honoured. If delegation for default agents is meant to be immutable, reject the agent_registry_update with a clear error instead of accepting it.

Acceptance criteria

• Repro gone — after step 2, spawn_async_subagent lists and accepts researcher without a restart.
• Regression safety — unit test: registry override of subagents.allowlist changes the scoped spec.
• Diff coverage ≥ 80%.

Related

Found on https://github.com/kamelhar/openhuman-oci while building a research fan-out; sibling headless findings #6925, #6926, #6927, #6933.