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The delegate_task tool spawns child AIAgent instances with isolated context, inherited tool access, and their own terminal sessions. Each child gets a fresh conversation and works independently — only its final summary enters the parent's context.

Top-level model calls run in the background automatically. Hermes returns a handle immediately so the conversation can continue, then posts the result back as a new message. An orchestrator subagent waits for its own workers so it can synthesize their results before returning.

Up to 3 concurrent subagents by default (configurable, no hard ceiling):

delegate_task(tasks=[
    {"goal": "Research topic A", "context": "Focus on recent primary sources"},
    {"goal": "Research topic B", "context": "Compare the leading explanations"},
    {"goal": "Fix the build", "context": "Project root: /home/user/project"}
])

This means the parent agent must pass everything the subagent needs in the call:

# BAD - subagent has no idea what "the error" is
delegate_task(goal="Fix the error")

# GOOD - subagent has all context it needs
delegate_task(
    goal="Fix the TypeError in api/handlers.py",
    context="""The file api/handlers.py has a TypeError on line 47:
    'NoneType' object has no attribute 'get'.
    The function process_request() receives a dict from parse_body(),
    but parse_body() returns None when Content-Type is missing.
    The project is at /home/user/myproject and uses Python 3.11."""
)

The subagent receives a focused system prompt built from your goal and context, instructing it to complete the task and provide a structured summary of what it did, what it found, any files modified, and any issues encountered.

Parallel Research

Research multiple topics simultaneously and collect summaries:

delegate_task(tasks=[
    {
        "goal": "Research the current state of WebAssembly in 2025",
        "context": "Focus on: browser support, non-browser runtimes, language support"
    },
    {
        "goal": "Research the current state of RISC-V adoption in 2025",
        "context": "Focus on: server chips, embedded systems, software ecosystem"
    },
    {
        "goal": "Research quantum computing progress in 2025",
        "context": "Focus on: error correction breakthroughs, practical applications, key players"
    }
])

Code Review + Fix

Delegate a review-and-fix workflow to a fresh context:

delegate_task(
    goal="Review the authentication module for security issues and fix any found",
    context="""Project at /home/user/webapp.
    Auth module files: src/auth/login.py, src/auth/jwt.py, src/auth/middleware.py.
    The project uses Flask, PyJWT, and bcrypt.
    Focus on: SQL injection, JWT validation, password handling, session management.
    Fix any issues found and run the test suite (pytest tests/auth/)."""
)

Multi-File Refactoring

Delegate a large refactoring task that would flood the parent's context:

delegate_task(
    goal="Refactor all Python files in src/ to replace print() with proper logging",
    context="""Project at /home/user/myproject.
    Use the 'logging' module with logger = logging.getLogger(__name__).
    Replace print() calls with appropriate log levels:
    - print(f"Error: ...") -> logger.error(...)
    - print(f"Warning: ...") -> logger.warning(...)
    - print(f"Debug: ...") -> logger.debug(...)
    - Other prints -> logger.info(...)
    Don't change print() in test files or CLI output.
    Run pytest after to verify nothing broke."""
)

When a top-level agent provides a tasks array, Hermes returns one background handle, runs the subagents in parallel, and posts one consolidated result after every child finishes. An orchestrator subagent waits for its batch in the current turn so it can synthesize the results.

• Maximum concurrency: 3 tasks by default (configurable via delegation.max_concurrent_children or the DELEGATION_MAX_CONCURRENT_CHILDREN env var; floor of 1, no hard ceiling). Batches larger than the limit return a tool error rather than being silently truncated.
• Thread pool: Uses ThreadPoolExecutor with the configured concurrency limit as max workers
• Progress display: In CLI mode, a tree-view shows tool calls from each subagent in real-time with per-task completion lines. In gateway mode, progress is batched and relayed to the parent's progress callback
• Result ordering: Results are sorted by task index to match input order regardless of completion order
• Cancellation: Follow-up messages do not cancel a top-level background batch. /stop or closing/resetting the owning session cancels its active children. Synchronous orchestrator children still follow their parent's interrupt state

Synchronous single-task delegation from an orchestrator runs directly without thread pool overhead.

Durable background completions

When a background delegation finishes, Hermes stores its completion event in the active profile's state.db before publishing it to the normal fresh-turn queue. If Hermes restarts after completion but before delivery, the pending event is restored and routed through the same ownership checks. Competing consumers use a durable claim, so only the consumer that successfully accepts the synthetic turn acknowledges delivery; failed attempts release the claim for retry.

This does not resume child execution after a crash. A delegation whose owner process disappears while it is still running is recorded as unknown, because Hermes cannot prove whether its external side effects happened. Pending and delivered records are bounded and profile-local.

You can configure a different model for subagents via config.yaml — useful for delegating simple tasks to cheaper/faster models:

# In ~/.hermes/config.yaml
delegation:
  model: "google/gemini-flash-2.0"    # Cheaper model for subagents
  provider: "openrouter"              # Optional: route subagents to a different provider

If omitted, subagents use the same model as the parent.

Cost strategy: frontier planner, inexpensive workers

Decomposing a problem into well-specified subtasks takes frontier-level judgment; executing a subtask that already comes with a clear goal, full context, and an output contract usually doesn't. Meanwhile the children are where the tokens go — a parallel batch of subagents typically burns the large majority of a run's total tokens, so the worker model is where the cost actually lives. Pinning delegation.model to an inexpensive model while your main session stays on a frontier model keeps the planning quality where it matters and cuts spend where the volume is:

# ~/.hermes/config.yaml
model:
  default: "your-frontier-model"     # parent (planner) stays on the frontier model
delegation:
  model: "your-inexpensive-model"    # all delegate_task children run on this
  provider: "openrouter"             # optional: route children to a different provider

Resolution order: delegation.base_url (direct endpoint) takes precedence, then delegation.provider (full credential bundle resolved via the runtime provider system), and when neither is set children inherit the parent's provider and credentials; delegation.model applies in all cases, and when it is empty children inherit the parent's model.

Note that the pin is global: delegate_task has no per-task model parameter, so every child in a batch runs on the configured delegation model. For quality-sensitive subtasks that need a stronger model, either leave delegation.model unset for that session or hand the task to the kanban board, which does support a per-task model override.

delegate_task does not accept a model-facing toolsets parameter. Each subagent inherits the parent's enabled toolsets so the model cannot grant a child capabilities that the parent does not have. Configure the parent's tools before starting the conversation if delegated work needs additional capabilities.

Certain tools are blocked for subagents even when the parent has them:

• delegate_task — blocked for leaf subagents (the default). Retained for role="orchestrator" children, bounded by max_spawn_depth — see Depth Limit and Nested Orchestration ↗ below.
• clarify — subagents cannot interact with the user
• memory — no writes to shared persistent memory
• send_message — no cross-platform side effects
• cronjob — no scheduling more work in the parent's name

Both roles retain execute_code (programmatic tool calling) so children can batch mechanical work.

Each subagent has an iteration limit (default: 50) that controls how many tool-calling turns it can take:

delegate_task(
    goal="Quick file check",
    context="Check if /etc/nginx/nginx.conf exists and print its first 10 lines",
    max_iterations=10  # Simple task, don't need many turns
)

By default there is no wall-clock timeout on subagents. Children fail only from what they're actually doing — API errors, tool errors, or hitting their iteration budget — never from a delegation-level stopwatch. Earlier releases shipped a hard cap (300s, later 600s), which kept killing legitimately busy children mid-task: deep code reviews, large research fan-outs, and slow reasoning models routinely need more than 10 minutes while making steady progress the whole time.

Genuinely stuck children are still detected: the heartbeat staleness monitor stops refreshing the parent's activity when a child makes no progress (no API calls, no tool starts, and no activity-timestamp ticks), letting the gateway inactivity timeout fire on a truly wedged worker. An in-flight model wait still counts as progress — subagents refresh the activity clock while waiting on the provider, so a slow local / long-prefill completion is not treated as stalled.

If you want a hard cap anyway (e.g. cost control on unattended cron-driven delegation), opt in per-install:

delegation:
  child_timeout_seconds: 0     # default: 0 = no timeout
  # child_timeout_seconds: 1800  # opt-in hard cap (floor 30s)

A positive value enforces a hard wall-clock limit on each child; 0 or a negative value disables it.

When a configured cap fires, the child's result carries structured timeout metadata alongside the error message so parents and hooks can distinguish a stopwatch kill from other failures without parsing text: timeout_seconds (the configured cap), timed_out_after_seconds (actual wall clock), and timeout_phase (before_first_llm_call when the child never reached its first request, after_llm_calls otherwise). All three are null on non-timeout errors.

Background delegations (delegate_task(background=true)) are watched by a progress-based stall monitor — on by default, zero config. Unlike a wall-clock timeout, it never touches a child that is making progress, no matter how long it runs.

The monitor samples each detached child's progress signals — API-call count, current tool, and last-activity timestamp (which ticks on **every streamed token**, tool transition, and API-call boundary, so a child mid-stream on a long response always counts as alive):

1. Progressing children are never touched. Any advancing signal resets the clock.
2. A child whose progress is completely frozen past the stale threshold (450s idle, 1200s while inside a tool — legitimately slow terminal commands and web fetches get the higher ceiling) is interrupted and given a 120s grace window. A child that unwinds in time delivers its partial results through the normal completion path.
3. A child that never returns is force-finalized with a terminal stalled completion event, so the owning session hears an outcome instead of going silent, and the async slot frees for new work.

The stalled event carries structured metadata mirroring the sync-path timeout fields: stalled_after_quiet_seconds, stall_threshold_seconds, stall_phase (idle / in_tool), and stall_grace_seconds.

This closed a long-standing failure mode where a wedged background child left its session looking dead until a process restart. The underlying wedge (children hanging at their first API call after multi-day gateway uptime) was also fixed at the root: delegated children now run their OpenAI-wire API requests inline on their own conversation thread instead of a nested worker thread — the layer where the wedge lived. The stall monitor remains as the safety net for anything else.

The TUI ships a /agents overlay (alias /tasks) that turns recursive delegate_task fan-out into a first-class audit surface:

• Live tree view of running and recently-finished subagents, grouped by parent
• Per-branch cost, token, and file-touched rollups
• Kill and pause controls — cancel a specific subagent mid-flight without interrupting its siblings
• Post-hoc review: step through each subagent's turn-by-turn history even after they've returned to the parent

The classic CLI just prints /agents as a text summary; the TUI is where the overlay shines. See TUI — Slash commands.

On the classic CLI and every gateway platform (Telegram, Discord, Slack, ...), /agents also lists background delegations with live per-child activity, sampled directly from each running child:

Background delegations: 1 running
- deleg_ab12cd34 · running · research the delegation stall monitor
  - child 1: 4 api calls · in web_search · active 12s ago
  - child 2: 7 api calls · between turns · active 3s ago

A delegation the stall monitor has flagged shows as stalling · no progress 450s — interrupting, and long-quiet-but-healthy children show their quiet time so you can tell "slow" from "stuck" at a glance.

Interrupting a child throws away its in-flight work; often you just want to redirect it.

From the parent agent (model-facing)

The parent agent orchestrates its own running children with the same delegate_task tool it spawned them with — no separate control tool:

{"action": "list"}
{"action": "steer", "subagent_id": "sa-0-1a2b3c4d", "message": "focus on pricing instead"}
{"action": "stop",  "subagent_id": "sa-0-1a2b3c4d"}

• list returns the conversation's live children: subagent_id, goal, status, running_seconds, accepting_steer, and the live transcript path. Ids also come back in the spawn dispatch response as subagent_ids.
• steer queues a course correction into a running child without stopping it (delivery semantics below).
• stop ends a child early at its next iteration boundary; the partial result still re-enters the conversation as a normal completion message.

Control actions run synchronously in-turn (never backgrounded), are scoped to the caller's own spawn tree — a conversation can never see or control another session's children — and never consume the per-turn subagent spawn cap, so stop keeps working even after the cap is hit.

From the TUI / gateway (session-facing)

steer_subagent(subagent_id, text) in tools/delegate_tool.py is the redirection-side mirror of interrupt_subagent(): it queues text into a live child through the same mechanism as /steer — the text is appended to the child's last tool result at its next iteration boundary, the in-flight tool call is never cut, and the child sees it as an out-of-band user message. Programmatic hosts reach it through the session-scoped subagent.steer gateway RPC, which sits beside subagent.interrupt:

{"method": "subagent.steer", "params": {"session_id": "owning-ui-session", "subagent_id": "sa-0-1a2b3c4d", "text": "focus on pricing instead"}}

Subagent ids come from delegation.status (or list_active_subagents()) — the same place subagent.interrupt gets them. The gateway accepts steering only from the exact live UI/gateway session that spawned the child. A missing, foreign, ambiguous, or stale/recycled session identity is rejected; knowing a global subagent id is not authority. Direct in-process callers retain the unscoped helper contract deliberately.

Queued is not delivered, but it is never synthetic success. A "queued" response means the text was accepted before the child's completion boundary, not necessarily that the child has seen it. Acceptance and completion are synchronized: either the child can still consume the text, or its exact text is drained into the result as pending_steer. Calls after closure return "rejected". If a child accepted the steer but had already produced its final answer, the completion entry the parent receives retains it as missed_steer, with a note appended to the summary:

[steer did not land — the subagent finished before it could be delivered: focus on pricing instead]

So the parent (or the operator driving it) can tell a steered child from one that finished on the old instructions, and re-issue the guidance as a follow-up instead of trusting that it landed.

Every delegate_task dispatch also creates one append-only, human-readable log per task so you (or the parent agent) can watch a subagent work in real time instead of waiting for the consolidated summary:

<hermes_home>/cache/delegation/live/<delegation_id>/task-<n>.log

The dispatch response includes the paths as live_transcripts, and the files are pre-created at dispatch time, so this works immediately:

tail -f ~/.hermes/cache/delegation/live/deleg_ab12cd34/task-0.log

Each line is timestamped and shows the child's assistant text, thinking snippets, tool calls (-> tool_name({args})), tool results, and a final status marker. A manifest.json in the same directory describes the batch (goals, task count, per-task status). The logs persist after completion — they double as the full-fidelity operational record alongside the summary — and directories older than 7 days are pruned automatically on new dispatches. Because they live under cache/delegation, they are also readable from remote terminal backends (Docker/Modal/SSH).

By default, delegation is flat: a parent (depth 0) spawns children (depth 1), and those children cannot delegate further. This prevents runaway recursive delegation.

For multi-stage workflows (research → synthesis, or parallel orchestration over sub-problems), a parent can spawn orchestrator children that can delegate their own workers:

delegate_task(
    goal="Survey three code review approaches and recommend one",
    role="orchestrator",  # Allows this child to spawn its own workers
    context="...",
)

• role="leaf" (default): child cannot delegate further — identical to the flat-delegation behavior.
• role="orchestrator": child retains the delegation toolset. Gated by delegation.max_spawn_depth (default 1 = flat, so role="orchestrator" is a no-op at defaults). Raise max_spawn_depth to 2 to allow orchestrator children to spawn leaf grandchildren; 3+ for deeper trees. There is no upper ceiling — cost is the practical limit.
• delegation.orchestrator_enabled: false: global kill switch that forces every child to leaf regardless of the role parameter.

Cost warning: With max_spawn_depth: 3 and max_concurrent_children: 3, the tree can reach 3×3×3 = 27 concurrent leaf agents. Each extra level multiplies spend — raise max_spawn_depth intentionally.

• Each subagent gets its own terminal session (separate from the parent)
• Subagents inherit the parent's enabled toolsets; the model cannot select or widen them per call
• Nested delegation is opt-in — only role="orchestrator" children can delegate further, and only when max_spawn_depth is raised from its default of 1 (flat). Disable globally with orchestrator_enabled: false.
• Leaf subagents cannot call: delegate_task, clarify, memory, send_message, cronjob. Orchestrator subagents retain delegate_task but keep the other blocks. Both roles retain execute_code (programmatic tool calling) so children can batch mechanical work instead of burning reasoning iterations.
• Cancellation follows ownership — /stop or closing/resetting the owning session cancels its background children; synchronous descendants under orchestrators follow their parent's interrupt state
• Only the final summary enters the parent's context, keeping token usage efficient
• Subagents inherit the parent's API key, provider configuration, and credential pool (enabling key rotation on rate limits)

By default, subagents share the parent's working directory — fine for research and read-heavy work, but parallel children editing the same repo can collide. Set delegation.worktree_isolation: true to give each child its own git worktree, branched from the repo's current HEAD (inspired by Muse Code's --subagent-worktree-isolation):

delegation:
  worktree_isolation: true   # default: false

With isolation on:

• Each child starts its terminal in <repo>/.worktrees/subagent-<id> on its own branch hermes-subagent/subagent-<id>, and its goal message tells it to work and commit there.
• The parent's checkout stays untouched; children can't clobber each other's edits.
• When a child finishes, its result entry gains a worktree field reporting path, branch, commits (ahead of the base), and dirty. The parent reviews or merges each branch (git log <branch>, git merge <branch>).
• A worktree left with no commits and a clean tree is pruned automatically (pruned: true); anything holding work is kept.
• Pruning requires proof. If a git inspection probe fails — or finalization itself errors — the worktree and branch are kept and the entry carries inspection_failed: true plus a note — commits/dirty are then defaults, not measurements, so inspect the worktree rather than assuming the child produced nothing.

Scope: opt-in, git-only, and local-terminal-backend-only. In a non-git directory, on docker/ssh/modal backends, or if worktree creation fails, the setting degrades silently to today's shared-workspace behavior — never an error.

Rule of thumb: Use delegate_task when the subtask requires reasoning, judgment, or multi-step problem solving. Use execute_code when you need mechanical data processing or scripted workflows.

# In ~/.hermes/config.yaml
delegation:
  max_iterations: 50                        # Max turns per child (default: 50)
  # max_concurrent_children: 3              # Parallel children per batch (default: 3)
  # worktree_isolation: false               # Give each child its own git worktree (see Worktree Isolation above)
  # max_spawn_depth: 1                      # Tree depth (floor 1, no ceiling, default 1 = flat). Raise to 2 to allow orchestrator children to spawn leaves; 3+ for deeper trees.
  # orchestrator_enabled: true              # Disable to force all children to leaf role.
  model: "google/gemini-3-flash-preview"             # Optional provider/model override
  provider: "openrouter"                             # Optional built-in provider
  api_mode: anthropic_messages                       # optional; auto-detected from base_url for anthropic_messages endpoints

# Or use a direct custom endpoint instead of provider:
delegation:
  model: "qwen2.5-coder"
  base_url: "http://localhost:1234/v1"
  api_key: "local-key"
  # api_mode: "anthropic_messages"  # Optional. Wire protocol override for base_url ("chat_completions", "codex_responses", or "anthropic_messages"). Empty = auto-detect from URL (e.g. /anthropic suffix). Set explicitly for endpoints the heuristic can't classify (Azure AI Foundry, MiniMax, Zhipu GLM, LiteLLM proxies, …).

When base_url points at an Anthropic-compatible endpoint — for example a path ending in /anthropic, an Azure Foundry Claude route, or a MiniMax /anthropic proxy — api_mode is auto-detected as anthropic_messages so the subagent uses the right wire format without you setting anything. Set api_mode explicitly when the auto-detection guess is wrong (rare).