ultrawork

ultrawork is a skill for Claude Code from jcwleo/oh-no-harness. It costs 34 tokens per session (5,990 once invoked), scanned A, original, MIT.

An orchestration workflow for taking a software idea through discovery, planning, implementation, and verification. It uses explicit stages and passes work between planning and execution steps.

In plain words
What is it for?
Use it when you want the coding agent to handle an end-to-end delivery task across research, planning, coding, and verification.
Why use it?
It gives broad, delegated work a defined path from the initial idea to a checked result.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions subagents; mentions Claude Code.

Part of the oh-no-harness plugin — 12 skills, 12 commands, 9 agents, 1 hook shipped together

Good fit Use it when you want the coding agent to handle an end-to-end delivery task across research, planning, coding, and verification.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jcwleo/oh-no-harness/ultrawork
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add jcwleo/oh-no-harness --skill ultrawork
Clone the repo
git clone --depth 1 https://github.com/jcwleo/oh-no-harness

Made for: Claude Code.

Or install oh-no-harness, the plugin that ships this one along with the rest of its 12 skills, 12 commands, 9 agents, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ultrawork

README.md
[![agentmods](https://agentmods.dev/badge/skills/jcwleo/oh-no-harness/ultrawork/github.svg)](https://agentmods.dev/skills/jcwleo/oh-no-harness/ultrawork)
Your own site
<a href="https://agentmods.dev/skills/jcwleo/oh-no-harness/ultrawork"><img src="https://agentmods.dev/badge/skills/jcwleo/oh-no-harness/ultrawork/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for ultrawork

Your own site · 80×15
<a href="https://agentmods.dev/skills/jcwleo/oh-no-harness/ultrawork"><img src="https://agentmods.dev/badge/skills/jcwleo/oh-no-harness/ultrawork.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,990 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.05990
Opus 5 $0.00017 $0.02995
Sonnet 5 $0.00007 $0.01198
Haiku 4.5 $0.00003 $0.00599

Measured 11d ago against content hash 6c8eb8b1c58a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

ultrawork scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/oh-no-harness/skills-claude/ultrawork/SKILL.md · 476 lines

How it starts

The opening of the file, as written. The whole thing — 476 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ultrawork for Claude Code

This generated file is the Claude Code-facing runtime skill document. Claude Code slash commands should read this file directly; maintainers edit the source documents listed below instead.

Generated Runtime Composition

Source order:

  • ../../docs/skill-core/ultrawork.md
  • ../../docs/platforms/claude-code-ultrawork.md

The sections below are already composed for this platform. Do not ask the runtime model to load another platform's runtime document or invocation syntax.

Source: docs/skill-core/ultrawork.md

Ultrawork

Ultrawork is a Markdown-first orchestration loop for moving from idea to verified result with the retained skill chain. Each phase is chosen explicitly from this Markdown workflow — there is no hidden next-step selector. Do not use it for a small concrete fix whose contract surface, baseline evidence, and verification command are already clear; use direct implementation or ralph.

Invariants

U1. Ultrawork orchestrates the retained chain and never replaces it: the
    planning gate uses `ralplan`, the execution handoff uses `ralph`.
    When Ralph is unavailable, Ultrawork may inline the phase procedure but
    remains an orchestrator: repository mutation still dispatches `executor` by
    default under Ralph's need test; inline writes require a recorded LIGHT-tiny
    or dispatch-unavailable fallback and carry the unchanged executor contract
    per Ralph's `## Mode-Gated Agent Dispatch`, and a fired review or audit
    trigger is exempt from the need test and never runs inline.
U2. Approved existing specs or plans may skip earlier phases only when the
    skip reason and source artifact are recorded; a merely relevant plan
    without approval evidence or with mismatched scope goes through the
    planning gate.
U3. requirements_gate: planning must not start until the requirements
    source is recorded. Interview is the only user-facing content approval
    gate for new work; ultrawork never auto-approves the interview spec.
U4. Once ralplan's gates pass, record the plan approval source and
    continue into ralph without a separate Plan Approval Brief prompt;
    pause only on ralplan's named pause conditions (canonical list:
    ralplan `### Ultrawork exception`).
U5. worktree_gate: no source file edit until a `Worktree decision` is
    recorded. Ultrawork's worktree duties are the numbered list in
    `### WORKTREE` below.
U6. The Direction Contract and AC IDs carry unchanged through plan,
    session, packets, and report; each phase records only its delta; a
    phase needing a direction change pauses for explicit user approval.
U7. Markdown at .oh-no/sessions/{sessionId}/ultrawork.md is authoritative.
    No JSON state artifact in v1; any future JSON must be derived and
    non-authoritative. No timer, daemon, or background heartbeat.
U8. Doctor/status runs at entry, resume, pre-execution, pre-merge, and
    pre-final; BLOCKED stops before edits, merge, or final claim.
U9. Escalation routes are fixed: ambiguous requirements -> user or
    `interview`; direction/scope conflict -> user or `ralplan`; failing
    checks or unknown root cause -> `systematic-debugging` (which owns
    `debugger` dispatch); public-contract/security/packaging risk ->
    `code-reviewer` or `verifier`; missing worktree or verification
    evidence -> blocked.
U10. Any scope change, missing authority artifact, failed worktree gate,
     or failed verification transitions to a named non-success outcome,
     never silent continuation.
U11. Final Validation does not repeat Ralph's completed internal gates;
     review-then-verify order holds and an early verifier is stale,
     discarded, and rerun.
U12. The run is invalid unless the ledger shows each named phase gate
     satisfied or a recorded not-required reason; a silently omitted step
     is a named ledger gap, not a pass.
U13. Ultrawork is the only context that may invoke interview/ralplan/ralph
     without their per-step transition question. It skips the between-phase
     "which next skill?" question and the separate plan-approval prompt —
     and skips nothing else: spec approval when requirements are unclear,
     planning gates, scope-change pauses, verification, and final evidence
     all still run.
U14. Maker roles do not self-approve; inline checker fallback is still
     checker output. When a named verifier trigger fires on a
     subagent-capable host, an
     inline check by the maker or accepting agent never satisfies the
     independent verifier audit. Same authorship alone is not that trigger.
U16. Phase-agent authorization, eligibility, and fallback follow
     `## Agent Roles`.
U17. A discovered plan admitted through U2 but lacking an execution
     profile gets the profile set before execution (schema is
     ralplan-owned); execution never starts profile-less.

Read the full file on GitHub · 476 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 476 lines · 34 tokens per session scan A 6c8eb8b1c58a

Subscribe to this mod's changes

ultrawork is a skill published in the GitHub repository jcwleo/oh-no-harness (11 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 5,990 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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