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 David405/harness-kit --skill harness-onboardgit clone --depth 1 https://github.com/David405/harness-kitWrote 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/david405/harness-kit/harness-onboard)<a href="https://agentmods.dev/skills/david405/harness-kit/harness-onboard"><img src="https://agentmods.dev/badge/skills/david405/harness-kit/harness-onboard.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 5.1 | $0.00084 | $0.00455 |
| Opus 5 | $0.00042 | $0.00228 |
| Sonnet 5 | $0.00017 | $0.00091 |
| Haiku 4.5 | $0.00008 | $0.00046 |
Grade A, and why
harness-onboard 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 7d 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.
What it actually says
Harness onboard
Kit-owned. Edit in the harness-kit repo, not in the consumer repo.
Scaffold a repo into the process. Run once per repo, then re-run after a kit upgrade.
When to use
Adopting the kit into a repo; recovering a repo whose AGENTS.md lost its process section;
verifying wiring after a submodule pointer bump.
When not to use
Ordinary feature work — that starts at sprint-contract.
Steps
- Detect the repo's default branch, stack, package manager and test/lint commands. Never assume.
- Scaffold, preserving what exists.
AGENTS.mdis filled fromtemplates/AGENTS.mdwith the process fromtemplates/AGENT_PROCESS.mdembedded — never overwrite a filledAGENTS.md; scaffold only what is missing. - Seed
FEATURES.jsonandskills/.harness/STATE.mdfrom their templates if absent. - README safety. If the root
README.mdholds real project setup, move it to a project setup doc and link it before writing the slim pointer. Never destroy project content. - Gitignore
skills/.harness/so contracts and state stay local working files. - Verify:
AGENTS.mdnames the stack, the default branch and real verify commands;FEATURES.jsonparses; the skill symlinks resolve.
Forms
templates/AGENTS.md · templates/AGENT_PROCESS.md · templates/FEATURES.json ·
templates/STATE.md · templates/README_POINTER.md
What ships with it
5 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.
- 7d ago First seen · 43 lines · 84 tokens per session scan A 8ea29012cdc2
harness-onboard is a skill published in the GitHub repository David405/harness-kit (2 stars, last pushed 9d ago), licensed Apache-2.0. It adds 84 tokens to every session and 455 once invoked, about $0.0004 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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