ultrawork
Parallel execution engine for high-throughput task completion
Best use case
ultrawork is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Parallel execution engine for high-throughput task completion
Teams using ultrawork should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/ultrawork/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How ultrawork Compares
| Feature / Agent | ultrawork | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Parallel execution engine for high-throughput task completion
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
Related Guides
Cursor vs Codex for AI Workflows
Compare Cursor and Codex for AI coding workflows, repository assistance, debugging, refactoring, and reusable developer skills.
AI Agents for Coding
Browse AI agent skills for coding, debugging, testing, refactoring, code review, and developer workflows across Claude, Cursor, and Codex.
Best AI Skills for Claude
Explore the best AI skills for Claude and Claude Code across coding, research, workflow automation, documentation, and agent operations.
SKILL.md Source
<Purpose>
Ultrawork is a parallel execution engine that runs multiple agents simultaneously for independent tasks. It is a component, not a standalone persistence mode -- it provides parallelism and smart model routing but not persistence, verification loops, or state management.
</Purpose>
<Use_When>
- Multiple independent tasks can run simultaneously
- User says "ulw", "ultrawork", or wants parallel execution
- You need to delegate work to multiple agents at once
- Task benefits from concurrent execution but the user will manage completion themselves
</Use_When>
<Do_Not_Use_When>
- Task requires guaranteed completion with verification -- use `ralph` instead (ralph includes ultrawork)
- Task requires a full autonomous pipeline -- use `autopilot` instead (autopilot includes ralph which includes ultrawork)
- There is only one sequential task with no parallelism opportunity -- delegate directly to an executor agent
- User needs session persistence for resume -- use `ralph` which adds persistence on top of ultrawork
</Do_Not_Use_When>
<Why_This_Exists>
Sequential task execution wastes time when tasks are independent. Ultrawork enables firing multiple agents simultaneously and routing each to the right model tier, reducing total execution time while controlling token costs. It is designed as a composable component that ralph and autopilot layer on top of.
</Why_This_Exists>
<Execution_Policy>
- Fire all independent agent calls simultaneously -- never serialize independent work
- Always pass the `model` parameter explicitly when delegating
- Read `docs/shared/agent-tiers.md` before first delegation for agent selection guidance
- 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
</Execution_Policy>
<Steps>
1. **Read agent reference**: Load `docs/shared/agent-tiers.md` for tier selection
2. **Classify tasks by independence**: Identify which tasks can run in parallel vs which have dependencies
3. **Route to correct tiers**:
- Simple lookups/definitions: LOW tier
- Standard implementation: STANDARD tier
- Complex analysis/refactoring: THOROUGH tier
4. **Fire independent tasks simultaneously**: Launch all parallel-safe tasks at once
5. **Run dependent tasks sequentially**: Wait for prerequisites before launching dependent work
6. **Background long operations**: Builds, installs, and test suites use `run_in_background: true`
7. **Verify when all tasks complete** (lightweight):
- Build/typecheck passes
- Affected tests pass
- No new errors introduced
</Steps>
<Tool_Usage>
- Use LOW-tier delegation for simple changes
- Use STANDARD-tier delegation for standard work
- Use THOROUGH-tier delegation for complex work
- 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 `omx_state` MCP tools for ultrawork lifecycle state.
- **On start**:
`state_write({mode: "ultrawork", active: true, reinforcement_count: 1, started_at: "<now>"})`
- **On each reinforcement/loop step**:
`state_write({mode: "ultrawork", reinforcement_count: <current>})`
- **On completion**:
`state_write({mode: "ultrawork", active: false})`
- **On cancellation/cleanup**:
run `$cancel` (which should call `state_clear(mode="ultrawork")`)
<Examples>
<Good>
Three independent tasks fired simultaneously:
```
delegate(role="executor", tier="LOW", task="Add missing type export for Config interface")
delegate(role="executor", tier="STANDARD", task="Implement the /api/users endpoint with validation")
delegate(role="test-engineer", tier="STANDARD", task="Add integration tests for the auth middleware")
```
Why good: Independent tasks at appropriate tiers, all fired at once.
</Good>
<Good>
Correct use of background execution:
```
delegate(role="executor", tier="STANDARD", task="npm install && npm run build", run_in_background=true)
delegate(role="writer", tier="LOW", task="Update the README with new API endpoints")
```
Why good: Long build runs in background while short task runs in foreground.
</Good>
<Bad>
Sequential execution of independent work:
```
result1 = delegate(executor, LOW, "Add type export") # wait...
result2 = delegate(executor, STANDARD, "Implement endpoint") # wait...
result3 = delegate(test-engineer, STANDARD, "Add tests") # wait...
```
Why bad: These tasks are independent. Running them sequentially wastes time.
</Bad>
<Bad>
Wrong tier selection:
```
delegate(role="executor", tier="THOROUGH", task="Add a missing semicolon")
```
Why bad: THOROUGH tier is expensive overkill for a trivial fix. Use LOW-tier execution instead.
</Bad>
</Examples>
<Escalation_And_Stop_Conditions>
- When ultrawork is invoked directly (not via ralph), apply lightweight verification only -- build passes, tests pass, no new errors
- For full persistence and comprehensive architect verification, recommend switching to `ralph` mode
- If a task fails repeatedly across retries, report the issue rather than retrying indefinitely
- Escalate to the user when tasks have unclear dependencies or conflicting requirements
</Escalation_And_Stop_Conditions>
<Final_Checklist>
- [ ] All parallel tasks completed
- [ ] Build/typecheck passes
- [ ] Affected tests pass
- [ ] No new errors introduced
</Final_Checklist>
<Advanced>
## Relationship to Other Modes
```
ralph (persistence wrapper)
\-- includes: ultrawork (this skill)
\-- provides: parallel execution only
autopilot (autonomous execution)
\-- includes: ralph
\-- includes: ultrawork (this skill)
ecomode (token efficiency)
\-- modifies: ultrawork's model selection
```
Ultrawork is the parallelism layer. Ralph adds persistence and verification. Autopilot adds the full lifecycle pipeline. Ecomode adjusts ultrawork's model routing to favor cheaper models.
</Advanced>Related Skills
worker
Team worker protocol (ACK, mailbox, task lifecycle) for tmux-based OMX teams
web-clone
URL-driven website cloning with visual + functional verification
visual-verdict
Structured visual QA verdict for screenshot-to-reference comparisons
ultraqa
QA cycling workflow - test, verify, fix, repeat until goal met
trace
Show agent flow trace timeline and summary
team
N coordinated agents on shared task list using tmux-based orchestration
tdd
Test-Driven Development enforcement skill - write tests first, always
swarm
N coordinated agents on shared task list (compatibility facade over team)
skill
Manage local skills - list, add, remove, search, edit, setup wizard
ralplan
Alias for $plan --consensus
ralph
Self-referential loop until task completion with architect verification
ralph-init
Initialize a PRD (Product Requirements Document) for structured ralph-loop execution