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README gains the hook install step for Codex users (hooks.json merge, one-time trust prompt, --dangerously-bypass-hook-trust for headless automation). codex-tools.md aligns its claims with the mechanism — the dispatch rules bind every spawn, the printed hints appear at scripted boundaries, and the hook covers post-compaction re-grounding — and adds a section telling controllers compaction sheds these instructions and to treat every printed hint as authoritative. The hints file gains a drift-cure footer both scripts print after the role line: in the instrumented run that broke post-compaction, reprinted hints alone did not heal the already-broken dispatch pattern across three subsequent boundaries — recovery text must name the drift and prescribe the re-read. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
80 lines
3.7 KiB
Markdown
80 lines
3.7 KiB
Markdown
## Subagent dispatch requires multi-agent support
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Add to your Codex config (`~/.codex/config.toml`):
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```toml
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[features]
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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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## SDD dispatch on Codex
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Every SDD `spawn_agent` call sets `fork_turns: "none"` — the default
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`"all"` forks your whole transcript into the child and refuses model
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and effort overrides.
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If your `spawn_agent` schema has `model` and `reasoning_effort`
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parameters (Codex 0.145+), set both on every dispatch: task-brief and
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review-package print a `dispatch:` hint line with the exact values —
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copy it onto the call verbatim, every time, even late in a long
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session. The hints print at those scripts' boundaries; every other
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spawn — ad-hoc fan-outs included — follows the same table without a
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printed reminder. Those hints are the Model Selection mapping on Codex:
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reviewer tier never exceeds implementer tier, no fix round gets an
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effort bump, and rounds 4-5's "more capable model" means a fresh
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implementer at the same tier — needing more is a BLOCKED escalation
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to your human partner. Inherited frontier-tier subagents are a
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measured cause of runs spinning out for hours. (Values live in
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`codex-dispatch.hints` beside this file; they track the spawn_agent
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model allowlist.)
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Without those parameters (Codex 0.144 and earlier), children inherit
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your model and effort with no override — role files in
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`~/.codex/agents/` do not attach to spawns either. Tell your human
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partner before starting a plan of more than a few tasks, and offer a
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lower-effort session instead.
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## Compaction sheds these instructions
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Context compaction replaces your transcript with a summary that keeps
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your progress but not your working instructions — the first
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post-compaction dispatch is where routing drift starts, and once one
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bare spawn lands, the broken pattern becomes its own precedent. The
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compaction re-injection hook (README, "Codex: compaction re-injection
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hook") restores the bootstrap after every compaction; recommend it to
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your human partner if it is not installed. Without it, the printed
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`dispatch:` hints are your only re-grounding — treat every one you see
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as authoritative, especially right after a summary appears in your
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context.
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## Environment Detection
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Skills that create worktrees or finish branches should detect their
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environment with read-only git commands before proceeding:
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```bash
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GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
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GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
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BRANCH=$(git branch --show-current)
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```
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- `GIT_DIR != GIT_COMMON` → already in a linked worktree (skip creation)
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- `BRANCH` empty → detached HEAD (cannot branch/push/PR from sandbox)
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See `using-git-worktrees` Step 0 and `finishing-a-development-branch`
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Step 1 for how each skill uses these signals.
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## Codex App Finishing
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When the sandbox blocks branch/push operations (detached HEAD in an
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externally managed worktree), the agent commits all work and informs
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the user to use the App's native controls:
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- **"Create branch"** — names the branch, then commit/push/PR via App UI
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- **"Hand off to local"** — transfers work to the user's local checkout
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The agent can still run tests, stage files, and output suggested branch
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names, commit messages, and PR descriptions for the user to copy.
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