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 agentmods add skills/nnabuuu/harness-engineering-toolkit/harness-createnpx 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.svg" alt="Measured on agentmods" 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 | $0.00145 | $0.02479 |
| Opus 5 | $0.00072 | $0.01239 |
| Sonnet 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 5d 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.
- 5d 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 1mo ago), licensed MIT. It adds 145 tokens to every session and 2,479 once invoked, about $0.0007 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 2026-08-31.
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