Multi-Agent Orchestration

Standalone Codex

Create each bounded worker with spawn_agent, deliver context to a running worker with send_message, trigger another turn for an idle existing worker with followup_task, wait with wait_agent, and stop a current turn with interrupt_agent only when necessary. Never spawn codex-verifier or call codex-run.ts.

Read the live concurrency limit and stay within it. Writers share the working tree unless the live host explicitly offers isolation. Assign non-overlapping ownership and serialize implementer and test-writer phases; only read-only reviewers may overlap. Codex implementers are not promised Claude worktree isolation. The lead owns every git operation: subagents never commit, stash, switch branches, or touch worktrees; they leave changes in place and report them, and the lead stages, verifies, and commits once per territory.

Phase 1: Research & Feasibility (GO/NO-GO Gate)

Before delegating to agents:

1. Parse requirements - Break down what needs to happen
2. Identify workstreams - Which are independent? Which have dependencies?
3. Assess scope - Is this actually multi-agent work, or simpler than it looks?
4. Sort into two piles (maestro principle 3): delegate-async work (isolated, well-specified) fans out; hold-the-lock work (the judgment is the work) stays with you, serially.

GO/NO-GO Verdict:

• GO - 3+ delegate-async workstreams, clear boundaries, agents work independently. Proceed — fan out the first pile only.
• SIMPLIFY - <3 workstreams, OR the work is mostly hold-the-lock regardless of size. Delegate the isolated bits with direct Agent() calls and keep the judgment-heavy parts yourself.
• NO-GO - Requirements unclear, scope too large, or high risk of file conflicts. Report and stop.

Do not proceed past this gate without an explicit verdict.

Phase 2: Orchestrate

This skill runs as the maestro agent: select agents, run them in parallel, and coordinate per agents/maestro.md. For simple delegation (1-2 agents), call Agent() directly without this skill.

Rule, don't stall. When a review finding conflicts with the plan, two briefs disagree, or a detail is ambiguous, decide it and record one line in the plan or status log: Ruling: <what you decided> / <why> / <cost if wrong>. Then keep going. Stop to ask only when the ruling would change the user's stated direction.

Verify Subagent Claims Independently

A subagent's "done" is a claim, not a result. Before building on it, committing, or reporting success:

1. Re-run the briefed verification yourself against the real artifact — the actual build, the actual binary's output, the actual grep sweep. Never forward a subagent's self-reported pass as your own verification.
2. Check the capability envelope. Subagents may lack tools you assume (a no-Bash implementer cannot run builds or delete files — it will improvise, e.g. zeroing a file instead of removing it, and still report done). Read what the agent says it couldn't do, then absorb the gap yourself: run the deletion, the build, the test.
3. Re-delegate vs fix solo. A trivial break found during verification (single file, few lines) — fix it solo with a one-line stated reason; round-tripping to a fresh subagent costs more than the fix. Anything that adds scope goes back out as a new, fully-briefed delegation. A scope_expansion status from an implementer is reviewed against its listed paths before anything lands.
4. Resume, don't respawn. If a subagent's report was cut off or is missing a section, Claude uses SendMessage; standalone Codex uses send_message while it is running or followup_task once idle. A respawn rebuilds its context from nothing and re-does paid work.
5. Review the diff, not the report. Record the base (git rev-parse HEAD) before dispatching each implementer. When it reports done, run git add -N . so new files show, write git diff <base> from the tree it wrote to into a scratch file, and hand the reviewer that path, the base SHA, and the brief. The implementer's report goes along only as claims to check, never as a summary in place of the diff.
6. Five fix rounds per task, then stop. A fix round is one fix dispatch plus a re-review of the new diff. Rounds 1-3 resume the same implementer (item 4) with the open findings verbatim. Rounds 4-5 spawn a fresh implementer with model: "fable" (standalone Codex: the strongest model the host offers), carrying the brief, the open findings, and what earlier rounds tried; three failed resumes usually mean the implementer cannot see its own mistake. If findings are still open after round 5, stop that task and report it blocked with each round's attempt and the open findings; other tasks continue. This cap covers review findings; crashed or timed-out agents follow maestro's retry rule.

Failure mode this section exists to prevent: chaining on an unverified "done" and discovering three phases later that the build never ran.

Standalone Codex orchestration

Follow the native lifecycle at the top of this skill: use spawn_agent for each new bounded workstream, queue dependent work instead of exceeding the live concurrency limit, and never invoke the Claude-to-Codex bridge. Claude agent teams and dynamic workflows are Claude-only; do not emulate their APIs in Codex.

When to Fan Out (Teams mode)

Use full parallel team fan-out instead of sequential subagent delegation when:

Prerequisites for fan-out

Two different mechanisms get confused here, so be explicit about which one you want:

• Subagent fan-out (Agent calls in one message) needs nothing enabled. This is what cc-settings actually uses, and what the rest of this skill assumes. Each subagent gets its own context window and reports back to you.
• Agent teams (teammates that message each other and share a task list) are available but not automatic. Pick a team over plain fan-out only when workers must challenge each other mid-flight; to collect N results, fan-out is cheaper. Rules and feasibility gates: CLAUDE-FULL.md → "Agent teams". For split panes, config/10-core.json pins teammateMode: "auto" (tmux, or iTerm2 with the it2 CLI).

Alternative: dynamic workflows (research preview)

A dynamic workflow is a JS harness that spawns subagents, holds plan state outside your context window, runs up to 16 agents concurrently (1000 total; raise the concurrency cap with CLAUDE_CODE_WORKFLOW_MAX_CONCURRENT_AGENTS, 1–256, since v2.1.269), and resumes from cached results within a session. The trigger isn't task size — it's whether the task risks one of three failure modes a single context window is prone to:

• Agentic laziness — stopping at 20 of 50 items and declaring done. → fan-out-and-synthesize: one agent per item, barrier-join the results.
• Self-preferential bias — preferring your own output when you're also the judge. → adversarial verification: a separate agent refutes each finding; or a tournament of pairwise comparisons (more reliable than absolute scoring for ranking or taste).
• Goal drift — losing "don't do X" constraints across compaction. → each subagent gets a focused, isolated goal that can't drift.

Shapes worth naming when you build one: classify-and-act, fan-out-and-synthesize, generate-and-filter, tournament, loop-until-done (spawn until a stop condition, not a fixed count). Not only for marathons — a quick workflow is valid: "quick workflow to adversarially check this one assumption."

• Budget — workflows burn more tokens; cap with "…budget 10k tokens" and the harness enforces it.
• Size — dynamic workflows default to a medium size guideline, aiming for fewer than 10 agents (Pro plans default to small); the running workflow's status line shows the current default. Override per-project via the workflowSizeGuideline settings key when a task genuinely needs more.
• Quarantine — for triage over untrusted input, agents that read public/untrusted content must not also take privileged actions; split reading from acting so an injected page can't trigger a privileged step.

Two entry points:

• One-shot: say "use a workflow to …" or the keyword ultracode in your prompt. Pair with /loop for repeatable triage/verification/research.
• Session-wide: /effort ultracode — auto-orchestrates a workflow for every substantive task.

The maestro Agent() fan-out above is the default in cc-settings; workflows are for replayability or scale beyond subagent fan-out. Don't rewire skills to depend on the Workflow tool — its API is still preview-stage — but a skill may ship an opt-in example (see audit's references/nuclear-review.workflow.js): a template you adapt, never a runtime dependency.

Output

Report: team composition (when fan-out chosen), task assignments, coordination strategy, and progress.

Variant: Phased Long-Running Execution

For tasks too large for a single context window. Implements git-commit checkpoints, automatic verification, and graceful recovery.

When to Use

• Large refactors spanning 10+ files
• Full feature implementation with tests
• Migration tasks (dependency upgrades, API changes)
• Any task estimated at >50% context window

Checkpoint Strategy

Context-Threshold Checkpoints

No hook saves state automatically — the agent must commit and write a handoff itself when it notices context usage crossing a threshold. At 70% commit finished work and log a progress summary; at 80% compact or run /handoff; at 90% stop, commit, and run /handoff (the usage table is in the handoff skill).

Manual Checkpoints

A checkpoint is a git commit of verified work. Commit at these milestones:

• After completing a logical phase
• Before risky operations (schema changes, large refactors)
• After passing verification

Maintenance Checkpoints

A completed phase is a commit checkpoint, not a stopping point — the job is the whole plan, not the first green milestone; finishing a phase means starting the next, and you only hand back to the user on a genuine blocker. On long runs, spend one pass every few phases on maintenance before drift accumulates: prune plan bloat (tasks that no longer match what the code taught you), refresh the live handoff so a cold resume lands cleanly, delete dead TODOs, and reconcile the plan with the current architecture rather than preserving development-only shims the plan predates.

Stamp the plan with the commit it was written against (git rev-parse --short HEAD) and re-stamp on every maintenance pass. The reconcile semantics: re-run the done-criteria of tasks marked complete (a "done" that no longer verifies gets reopened, not trusted), refresh file/line refs that drifted since the stamp, and retire tasks obsoleted by intervening changes with a one-line reason so they aren't re-litigated later.

Rolling Back

To undo a bad phase, use Claude Code's built-in /rewind (conversation and file state), or git revert --no-edit <checkpoint-commit>..HEAD to undo every commit after the last good one (a soft reset would leave the bad phase's changes staged). /handoff carries the plan, decisions, and remaining todos into a new session.

Verification Stack

Every checkpoint commit must pass Levels 1-3 first. Full verification (Levels 1-5) at task completion. See hooks/verification-check.md for the complete 5-level stack, per-agent requirements, and failure handling.

Workflow

Phase 1: Planning

Agent(planner, "Break down [task] into phases with dependencies and estimates")

Produce a phased plan with:

• A ## Functional DAG up top (docs/functional-dag.md) — the fan-out piles are its columns, so the parallelizable set is read off the diagram instead of guessed
• Ordered phases with dependencies
• Token estimates per phase
• Checkpoint points identified
• Verification criteria per phase

Phase 2: Execution Loop

For each phase:

1. Start: Log phase start
2. Implement: Execute the phase work
3. Verify: Run verification stack
4. Checkpoint: Commit verified work if a milestone was reached
5. Monitor: Check context usage, commit and hand off if a threshold is hit

To drive this loop unattended, set a /goal whose condition matches the completion promise — e.g. /goal all phases complete, tsc + lint + tests exit 0, git status is clean. The goal evaluator runs after every turn and keeps the session going until the condition holds; it survives --resume so a goal set before a handoff carries into the next session.

Phase 3: Completion

End with the Completion Promise below.

Recovery from Interruption

When resuming after interruption:

1. Run /handoff resume to load the latest handoff, if one was saved
2. Check git status and git log for the last checkpoint commit and uncommitted work
3. Review remaining todos
4. Run verification to confirm baseline
5. Continue from next incomplete phase

Completion Promise

The task is NOT complete until:

1. All phases done
2. Verification passes (compile + lint + test)
3. Git is clean (all changes committed)
4. Summary provided with what was done

Only then output:

<promise>COMPLETE</promise>

Never claim completion with failing verification.