Parallel execution engine for high-throughput task completion
Install with the open skills CLI (global, non-interactive — available in every Claude Code session):
npx skills add Yeachan-Heo/oh-my-codex --skill "ultrawork" -g -a claude-code -yOr manually — clone and copy the skill directory (SKILL.md + companion files):
git clone --depth 1 https://github.com/Yeachan-Heo/oh-my-codex /tmp/oh-my-codex && cp -r /tmp/oh-my-codex/skills/ultrawork ~/.claude/skills/ultrawork-yeachan-heo-3This skill is a directory: SKILL.md is the entry point; the files below ship with it.
---
name: ultrawork
description: Parallel execution engine for high-throughput task completion
---
<Purpose>
Ultrawork is a parallel execution engine for high-throughput task completion. It is a component, not a standalone persistence or verification mode: it provides parallelism, context discipline, and smart delegation guidance, but not durable goal tracking, Team's tmux worker lifecycle, Ralph's legacy persistence loop, architect sign-off, or long-running completion guarantees.
</Purpose>
<Use_When>
- Multiple independent tasks can run simultaneously
- User says "ulw", "ultrawork", or explicitly wants parallel execution
- Task benefits from concurrent execution plus lightweight evidence before wrap-up
- You need a direct-tool lane plus optional background evidence lanes without entering Team or a durable goal workflow
</Use_When>
<Do_Not_Use_When>
- Task needs durable goal tracking, ledger checkpoints, or resume across stories -- use `ultragoal` instead
- Task needs coordinated tmux workers, shared task state, mailbox/dispatch coordination, or long-running parallel execution -- use `team` instead
- Task requires a full autonomous pipeline -- use `autopilot` instead (default loop: `deep-interview -> ralplan -> ultragoal`, with `team` only when needed)
- Task intentionally requires the legacy persistent single-owner completion/verification loop -- use `ralph` explicitly; do not present it as the default durable path
- There is only one sequential task with no parallelism opportunity -- execute directly, use `ultragoal` for durable tracking, or delegate to a single `executor`
- The request is still in plan-consensus mode -- keep planning artifacts in `ralplan` until execution is explicitly authorized
</Do_Not_Use_When>
<Why_This_Exists>
Sequential task execution wastes time when tasks are independent. Ultrawork keeps the execution branch fast while tightening the protocol: gather enough context first, define pass/fail acceptance criteria before editing, decide deliberately between local execution and delegation, and finish with evidence rather than vibes.
</Why_This_Exists>
<Execution_Policy>
- Gather enough context before implementation. Start with the task intent, desired outcome, constraints, likely touchpoints, and any uncertainty that would change the execution path.
- If uncertainty is still material after a quick repo read, do a focused evidence pass first instead of immediately editing.
- Define pass/fail acceptance criteria before launching execution lanes. Include the command, artifact, or manual check that will prove success.
- Prefer direct tool work when the task is small, coupled, or blocked on immediate local context. Delegate only when the work is independent enough to benefit from parallel execution.
- When useful, run a direct-tool lane and one or more background evidence lanes at the same time. Evidence lanes can cover docs, tests, regression mapping, or bounded repo analysis.
- Fire independent agent calls simultaneously -- never serialize independent work.
- Always pass the `model` parameter explicitly when delegating.
- Read `references/agent-tiers.md` before first delegation for agent selection guidance.
- Auto-delegate `researcher` when official docs, version-aware framework guidance, best practices, or external dependency behavior materially affect task correctness; treat it as an evidence lane, not a replacement primary workflow.
- Use `run_in_background: true` for operations over ~30 seconds (installs, builds, tests).
- Run quick commands (git status, file reads, simple checks) in the foreground.
- Apply the shared workflow guidance pattern: outcome-first framing, concise visible updates for speculative/blocked lanes, local overrides for the active workflow branch, evidence-backed validation, explicit stop rules, and continuation of clear safe execution branches instead of restarting or re-asking.
- If the user says `continue`, continue the active workflow branch rather than restarting discovery or re-asking settled questions.
</Execution_Policy>
<Steps>
1. **Read agent reference**: Load `references/agent-tiers.md` for tier selection.
2. **Context + certainty check**:
- State the task intent in one sentence.
- List the constraints and unknowns that could invalidate a quick fix.
- If confidence is low, explore first and narrow the task before editing.
3. **Define acceptance criteria before execution**:
- What must be true at the end?
- Which command or artifact proves it?
- Which manual QA check is required, if any?
4. **Classify the work by dependency shape**:
- Independent tasks -> parallel lanes.
- Shared-file or prerequisite-heavy tasks -> local execution or staged lanes.
5. **Choose self vs delegate deliberately**:
- Work locally when the next step depends on immediate repo context, shared files, or tight iteration.
- Delegate when the task slice is bounded, independent, and materially improves throughput.
6. **Run execution lanes**:
- Direct-tool lane for immediate implementation or verification work.
- Background evidence lanes for tests, docs, repo analysis, or regression checks.
7. **Run dependent tasks sequentially**: Wait for prerequisites before launching dependent work.
8. **Close with lightweight evidence**:
- Build/typecheck passes when relevant.
- Affected tests pass.
- Manual QA notes are recorded when the task needs a human-visible or behavior-level check.
- No new errors introduced.
</Steps>
<Tool_Usage>
- Use LOW-tier delegation for simple lookups and bounded evidence gathering.
- Use STANDARD-tier delegation for standard implementation and regression work.
- Use THOROUGH-tier delegation for complex analysis, architectural review, or risky multi-file changes.
- Prefer a direct-tool lane when the immediate next step is blocked on local context.
- Prefer background evidence lanes when you can learn something useful in parallel with implementation.
- Use `run_in_background: true` for package installs, builds, and test suites.
- Use foreground execution for quick status checks and file operations.
</Tool_Usage>
## State Management
Use the CLI-first state surface (`omx state ... --json`) for ultrawork lifecycle state. If explicit MCP compatibility tools are already available, equivalent `omx_state` calls are optional compatibility, not the default.
- **On start**:
`omx state write --input '{"mode":"ultrawork","active":true,"reinforcement_count":1,"started_at":"<now>"}' --json`
- **On each reinforcement/loop step**:
`omx state write --input '{"mode":"ultrawork","reinforcement_count":<current>}' --json`
- **On completion**:
`omx state write --input '{"mode":"ultrawork","active":false}' --json`
- **On cancellation/cleanup**:
run `$cancel` (which should call `omx state clear --input '{"mode":"ultrawork"}' --json`)
<Examples>
<Good>
Two-track execution with acceptance criteria up front:
```
Acceptance criteria:
- `npm run build` passes
- `node --test dist/scripts/__tests__/codex-native-hook.test.js` passes
- Manual QA: verify `$ultrawork` activation message still points to the session state file
Direct-tool lane:
- update `skills/ultrawork/SKILL.md`
Background evidence lane:
- use /prompts:test-engineer for this scoped task
```
Why good: Context is grounded first, acceptance criteria are explicit, and the direct-tool lane runs alongside a bounded evidence lane.
</Good>
<Good>
Correct use of self-vs-delegate judgment:
```
Shared-file edit in progress across `src/scripts/codex-native-hook.ts` and its test -> keep implementation local.
Independent regression mapping for keyword-detector coverage -> delegate to a test-engineer lane.
```
Why good: Shared-file work stays local; independent evidence work fans out.
</Good>
<Bad>
Parallelizing before the task is grounded:
```
use /prompts:executor for this scoped task
use /prompts:test-engineer for this scoped task
```
Why bad: No context snapshot, no pass/fail target, and delegation starts before the work is shaped.
</Bad>
<Bad>
Claiming success without evidence or manual QA:
```
Made the changes. Ultrawork should be updated now.
```
Why bad: No verification output, no acceptance evidence, and no manual QA note when the behavior is user-visible.
</Bad>
</Examples>
<Escalation_And_Stop_Conditions>
- When ultrawork is invoked directly, apply lightweight verification only -- build/typecheck passes when relevant, affected tests pass, and manual QA notes are captured when needed.
- Ultrawork does not own persistence, durable ledgers, architect verification, deslop, full QA, or the full verified-completion promise. Do not claim those guarantees from direct ultrawork alone.
- Escalate to `ultragoal` when the work needs durable goal state, story checkpoints, or resume across implementation steps.
- Escalate to `team` when the work needs coordinated tmux workers, shared task state, or durable multi-worker lifecycle control.
- Escalate to explicitly requested `ralph` only for the supported legacy single-owner persistence/verification fallback.
- Ralph owns persistence, architect verification, deslop, and the full verified-completion promise only when explicitly selected as the supported legacy fallback; direct ultrawork does not own those guarantees.
- If a task fails repeatedly across retries, report the issue rather than retrying indefinitely.
- Escalate to the user when tasks have unclear dependencies, conflicting requirements, or a materially branching acceptance target.
</Escalation_And_Stop_Conditions>
<Final_Checklist>
- [ ] Task intent and constraints were grounded before editing
- [ ] Pass/fail acceptance criteria were stated before execution
- [ ] Parallel lanes were used only for independent work
- [ ] Build/typecheck passes when relevant
- [ ] Affected tests pass
- [ ] Manual QA notes recorded when behavior is user-visible
- [ ] No new errors introduced
- [ ] Completion claim stays inside ultrawork's lightweight-verification boundary
</Final_Checklist>
<Advanced>
## Relationship to Other Modes
```
ultrawork (this skill)
\-- provides: in-session parallel execution discipline + lightweight evidence
ultragoal (durable goal execution)
\-- owns: goal ledger, checkpoints, resume across stories, final gate discipline
\-- may use: team for parallel lanes when a story benefits from coordinated workers
team (tmux coordinated execution)
\-- owns: worker panes, shared task state, mailbox/dispatch, lifecycle control
\-- can return: checkpoint-ready evidence to an Ultragoal leader
autopilot (strict autonomous delivery loop)
\-- default flow: deep-interview -> ralplan -> ultragoal -> code-review -> ultraqa
\-- may use: team only when an Ultragoal story needs parallel execution
ralph (supported legacy explicit fallback)
\-- owns: single-owner persistence loop + architect verification when intentionally selected
ecomode (deprecated compatibility-only)
\-- do not route users there from ultrawork; it is not the current model-selection path
```
Ultrawork is the parallelism and execution-discipline layer. Ultragoal is the current default durable goal/ledger follow-up. Team is the coordinated tmux parallel runtime, often nested under an Ultragoal story when durable work needs multiple lanes. Autopilot orchestrates the full default lifecycle through deep-interview, ralplan, ultragoal, code-review, and ultraqa. Ralph remains active as an explicit legacy fallback for persistent single-owner verification, but it is not the recommended default durable path. Ecomode is deprecated compatibility-only and should not be advertised as the ultrawork model-selection route.
</Advanced>
Use when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
Use when you have a written implementation plan to execute in a separate session with review checkpoints
Use when executing implementation plans with independent tasks in the current session