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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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website/docs/guides/delegation-patterns.md
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@ -216,8 +216,8 @@ Restricting toolsets keeps the subagent focused and prevents accidental side eff
## Constraints
- **Default 3 parallel tasks** — batches default to 3 concurrent subagents (configurable via `delegation.max_concurrent_children` in config.yaml)
- **No nesting** — subagents cannot call `delegate_task`, `clarify`, `memory`, `send_message`, or `execute_code`
- **Default 3 parallel tasks** — batches default to 3 concurrent subagents (configurable via `delegation.max_concurrent_children` in config.yaml — no hard ceiling, only a floor of 1)
- **Nested delegation is opt-in** — leaf subagents (default) cannot call `delegate_task`, `clarify`, `memory`, `send_message`, or `execute_code`. Orchestrator subagents (`role="orchestrator"`) retain `delegate_task` for further delegation, but only when `delegation.max_spawn_depth` is raised above the default of 1 (1-3 supported); the other four remain blocked. Disable globally via `delegation.orchestrator_enabled: false`.
- **Separate terminals** — each subagent gets its own terminal session with separate working directory and state
- **No conversation history** — subagents see only what you put in `goal` and `context`
- **Default 50 iterations** — set `max_iterations` lower for simple tasks to save cost