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@@ -7,7 +7,76 @@ Add to your Codex config (`~/.codex/config.toml`):
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multi_agent = true
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```
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This enables `spawn_agent`, `wait_agent`, and `close_agent` for skills like `dispatching-parallel-agents` and `subagent-driven-development`. When using subagent-driven-development, close reviewer subagents when their review returns. Keep each implementer subagent open until its task's review passes — the fix loop resumes the implementer — then close it. If your harness cannot send another message to a spawned agent, dispatch each fix round as a fresh implementer carrying the brief, the report file, and the findings.
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This enables the multi-agent tools that skills like
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`dispatching-parallel-agents` and `subagent-driven-development` use.
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Which tools you get depends on the multi-agent version your model
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preset selects (current presets run V2; older ones run V1). Trust your
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actual tool list over any table — including this one — when they
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disagree.
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- **Spawning:** give children a clean context with
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`spawn_agent {fork_turns: "none"}`; the default `"all"` copies your
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entire transcript into the child. On Codex 0.145+, role files under
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`~/.codex/agents/` attach to isolated forks via `agent_type`.
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Full-history forks accept `model` and `reasoning_effort` overrides
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(only `agent_type` is refused there) — isolated forks are the SDD
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default for context hygiene, not because overrides require them.
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- **Fix rounds:** resume the implementer with `followup_task` — it
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delivers your message, triggers a turn, and transparently reloads a
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child the harness evicted. Never dispatch a fresh implementer on the
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theory that a spawned agent cannot be messaged again; on V2 it
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always can.
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- **Lifecycle:** V2 has no `close_agent`. Finished children are
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evicted automatically when slots are needed; leaving them unclosed
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costs nothing. Only V1 sessions have `close_agent` — there, close
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reviewers when their review returns, and close each implementer
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after its task's review passes.
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- **Model names:** never copy a model name from a skill, table, or old
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session into `spawn_agent` without checking it against your current
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spawn allowlist — V2 accepts only V2-capable presets and hard-errors
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on the rest.
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## Waiting on children
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`wait_agent` is an event subscription, not a poll: a long wait wakes
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the moment a child produces mailbox activity, with the same latency as
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a short one. Short-timeout polling buys nothing and costs a tool call —
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and a context rebill — per poll. In measured sessions, roughly
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two-thirds of all wait calls were short polls that timed out.
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- While you still have local work, do not wait at all. A completed
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child's final answer is pushed into your mailbox and arrives with
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your next turn.
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- When you are genuinely idle with children outstanding, wait in
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bounded stretches: `wait_agent` with `timeout_ms` 300000-600000
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(5-10 minutes). After each stretch — wake or timeout — post one
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status line, run `list_agents`, and chase any child that finished
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without reporting. Never stack polls shorter than five minutes; the
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event subscription wakes a bounded stretch just as fast as a short
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one.
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- Completion mail cannot wake an idle controller (it is delivered
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without triggering a turn); covering that idle window is
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`wait_agent`'s only job. A stretch that times out with no activity
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is your cue to reconcile, not to shorten the next stretch.
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## Model routing on spawns
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Every `spawn_agent` you issue — including when you are yourself a
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spawned child running a fan-out — sets `model` AND `reasoning_effort`
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explicitly, per the Model Selection rules of the skill you are
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executing. Setting `model` alone is a trap: the child's effort
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silently resets to that model's default, not to yours.
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Ask your human partner to add a machine-level backstop to
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`~/.codex/config.toml` so any spawn that slips through still routes to
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a deliberate tier instead of silently inheriting the session's most
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expensive model:
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```toml
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[agents]
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default_subagent_model = "<a mid-tier model from your spawn allowlist>"
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default_subagent_reasoning_effort = "medium"
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```
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## Environment Detection
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