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.
npx skills add nnabuuu/harness-engineering-toolkit --skill harness-creategit clone --depth 1 https://github.com/nnabuuu/harness-engineering-toolkitWrote 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.
[](https://agentmods.dev/skills/nnabuuu/harness-engineering-toolkit/harness-create)<a href="https://agentmods.dev/skills/nnabuuu/harness-engineering-toolkit/harness-create"><img src="https://agentmods.dev/badge/skills/nnabuuu/harness-engineering-toolkit/harness-create/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.
<a href="https://agentmods.dev/skills/nnabuuu/harness-engineering-toolkit/harness-create"><img src="https://agentmods.dev/badge/skills/nnabuuu/harness-engineering-toolkit/harness-create.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00145 | $0.02479 |
| Opus 5.5 | $0.00058 | $0.00992 |
| Sonnet 5.5 | $0.00029 | $0.00496 |
| Haiku 4.5 | $0.00015 | $0.00248 |
Grade A, and why
harness-create 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harness Creator
Turn a goal into a running overnight harness — from interview through spec to generated project.
Self-Review Checklist (read BEFORE and AFTER every phase)
Planning Phase Guards
- Did NOT generate any files (harness.sh, prompts/, drafts/) during Phase 1
- Completed ALL interview questions before producing HARNESS_SPEC.md
- Got explicit user confirmation before moving to Phase 2
Build Phase Guards
- Agent prompt(s) have fresh context warning at top
-
--allowedToolsset for eachclaude -pinvocation - Git commits after each step in the orchestrator
- All exit conditions from the spec are implemented
- Orchestrator supports
--dry-run,--resume,--max-cost,--step,--status,--register-dagu,--unregister-dagu - Generator writes changelog to a dedicated FILE (not stdout)
- Evaluator writes report to a dedicated FILE (not stdout)
- Orchestrator extracts data from files (not stdout)
- Orchestrator uses state.json for sub-step tracking (jq dependency checked)
- Orchestrator injects starting-point context per iteration
- dag.yaml generated with steps matching harness.sh step functions
- DAGU auto-registration attempted (symlink if dagu installed, skip if not)
- [Code Mode] Validation step with revert on failure
- [Code Mode] Frozen file violation gate
- [Code Mode] Regression detection (revert if score drops > 5)
- [Investigation Mode] Investigator writes to
evidence/h{N}-{name}.md - [Investigation Mode] Explicit CONFIRMED/ELIMINATED/INCONCLUSIVE judgment
- [Investigation Mode] Dead-end detection when all hypotheses eliminated
- Orchestrator has
preflight()checking all prerequisites from SPEC.md - [If health checks defined] Orchestrator has
health_check()between iterations
Entry Point Detection
Determine which entry point applies:
Entry A — No spec exists: The user has a goal but no HARNESS_SPEC.md. Start with Phase 1 (Planning Interview).
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 222 lines · 145 tokens per session scan A 7e2fd7f43857
harness-create is a skill published in the GitHub repository nnabuuu/harness-engineering-toolkit (5 stars, last pushed 3mo ago), licensed MIT. It adds 145 tokens to every session and 2,479 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-08-31.
Other skills, from other repositories
Cortex
Operate Cortex, the LifeOS memory system — the typed Knowledge Archive (People, Companies, Ideas, Research with typed related: links) plus recall of prior work sessions, ISAs, and conversations. Search, add, harvest, develop, ingest, distill, graph-navigate, recall. USE WHEN cortex, knowledge, knowledge base, search…
omh-code-review
This is an OMH code-review workflow skill, projected for Agent Skills hosts (Claude Code, Codex, Cursor, opencode, OpenClaw, pi).
omh-rust
This is an OMH rust workflow skill, projected for Agent Skills hosts (Claude Code, Codex, Cursor, opencode, OpenClaw, pi).
redteam-web-detail-pack
Routing and boundary guidance for authorized general web application security testing. Use as a web testing router when the attack surface should be dispatched to more specific web vulnerability skills.
android-pentest
A guide for authorized security testing of Android apps, covering APK inspection, runtime testing, traffic capture, code review, and function hooking. An APK is the installable package used by an Android app.
manage-schemas
Creates, views, edits, deletes, and validates note schemas for the MCP Task Orchestrator in .taskorchestrator/config.yaml — the templates that define which notes agents must fill at each workflow phase. Also recommends schema designs from a library of workflow patterns (autonomous coding loops, spec-driven teams…