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feat(delegate): orchestrator role and configurable spawn depth (default flat)

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Adds role='leaf'|'orchestrator' to delegate_task. With max_spawn_depth>=2,
an orchestrator child retains the 'delegation' toolset and can spawn its
own workers; leaf children cannot delegate further (identical to today).

Default posture is flat — max_spawn_depth=1 means a depth-0 parent's
children land at the depth-1 floor and orchestrator role silently
degrades to leaf. Users opt into nested delegation by raising
max_spawn_depth to 2 or 3 in config.yaml.

Also threads acp_command/acp_args through the main agent loop's delegate
dispatch (previously silently dropped in the schema) via a new
_dispatch_delegate_task helper, and adds a DelegateEvent enum with
legacy-string back-compat for gateway/ACP/CLI progress consumers.

Config (hermes_cli/config.py defaults):
  delegation.max_concurrent_children: 3   # floor-only, no upper cap
  delegation.max_spawn_depth: 1           # 1=flat (default), 2-3 unlock nested
  delegation.orchestrator_enabled: true   # global kill switch

Salvaged from @pefontana's PR #11215. Overrides vs. the original PR:
concurrency stays at 3 (PR bumped to 5 + cap 8 — we keep the floor only,
no hard ceiling); max_spawn_depth defaults to 1 (PR defaulted to 2 which
silently enabled one level of orchestration for every user).

Co-authored-by: pefontana <fontana.pedro93@gmail.com>
This commit is contained in:
pefontana 2026-04-21 14:11:53 -07:00 • committed by Teknium
parent e7f8a5fea3
commit 48ecb98f8a
11 changed files with 1003 additions and 64 deletions
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4
tests/agent/test_subagent_progress.py
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@ -193,7 +193,7 @@ class TestBuildChildProgressCallback:
# task_index=0 in a batch of 3 → prefix "[1]"
cb0 = _build_child_progress_callback(0, "test goal", parent, task_count=3)
cb0("web_search", "test")
cb0("tool.started", "web_search", "test", {})
output = buf.getvalue()
assert "[1]" in output
@ -201,7 +201,7 @@ class TestBuildChildProgressCallback:
buf.truncate(0)
buf.seek(0)
cb2 = _build_child_progress_callback(2, "test goal", parent, task_count=3)
cb2("web_search", "test")
cb2("tool.started", "web_search", "test", {})
output = buf.getvalue()
assert "[3]" in output