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 pproenca/dot-skills --skill dx-harnessgit clone --depth 1 https://github.com/pproenca/dot-skillsWrote 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/pproenca/dot-skills/dx-harness)<a href="https://agentmods.dev/skills/pproenca/dot-skills/dx-harness"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/dx-harness/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/pproenca/dot-skills/dx-harness"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/dx-harness.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00166 | $0.01462 |
| Opus 5 | $0.00083 | $0.00731 |
| Sonnet 5 | $0.00033 | $0.00292 |
| Haiku 4.5 | $0.00017 | $0.00146 |
Grade A, and why
dx-harness 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 — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
DX Harness
Audits, scaffolds, and maintains the developer-experience harness of a repository. The harness is the meta-tooling that makes a dev loop fast: one-command bootstrap, one-command reset, one-command seed, discoverable conventions, agent-friendly entry points.
This skill exists because dev-experience attrition is real: harnesses rot, manual steps creep back in, conventions drift, and the cost is paid in micro-friction every day. The skill detects attrition systematically and applies canonical fixes.
When to Apply
Trigger this skill when:
- A user describes a repeated manual chore ("every time I reset the db I have to re-register", "I always run these three commands before working")
- A user mentions slow onboarding or asks "how do I get this running"
- A new repo is being bootstrapped and needs a harness from day one
- A user explicitly asks to audit DX or measure time-to-first-commit (TTFC)
- A user asks to fix missing bootstrap/reset/seed scripts or AGENTS.md
- A periodic maintenance pass is needed (e.g., after a release, after onboarding a new engineer)
Workflow Overview
┌────────────────────────────────────────────────────────────┐
│ 1. DISCOVER scripts/discover.sh → repo-fingerprint │
│ 2. AUDIT scripts/audit.sh → dx-audit.json │
│ 3. PRIORITIZE scripts/prioritize.sh → ranked findings │
│ 4. SCAFFOLD scripts/scaffold-*.sh → scratch dir │
│ 5. CONFIRM show diff to user; user picks what to apply│
│ 6. VERIFY scripts/verify.sh → assertions + timing │
│ 7. TRACK scripts/track-attrition.sh → audit log │
└────────────────────────────────────────────────────────────┘
All scaffolded edits land in a scratch directory first (${TMPDIR}/dx-harness-<timestamp>/). The user reviews the diff and chooses what to copy back into the repo. No surprise writes to the working tree.
Tool Requirements
Required: bash, git, node, jq.
Detected at runtime (the skill adapts — it never forces a migration):
What ships with it
26 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.
- assets/templates/AGENTS.md.tmpl 1.5 KB
- assets/templates/bootstrap.sh.tmpl 1.2 KB
- assets/templates/Justfile.tmpl 736 B
- assets/templates/Makefile.tmpl 667 B
- assets/templates/reset.sh.tmpl 1.2 KB
- assets/templates/seed.sh.tmpl 1.4 KB
- config.json 1.3 KB
- gotchas.md 523 B
- metadata.json 914 B
- references/attrition-patterns.md 4.4 KB
- references/audit-checklist.md 7.6 KB
- references/fix-recipes.md 6.5 KB
- references/workflow.md 7.0 KB
- scripts/audit.sh 8.0 KB runs code
- scripts/discover.sh 2.6 KB runs code
- scripts/lib/common.sh 4.6 KB runs code
- scripts/lib/detectors.sh 5.8 KB runs code
- scripts/prioritize.sh 974 B runs code
- scripts/scaffold-agents-md.sh 2.5 KB runs code
- scripts/scaffold-bootstrap.sh 2.3 KB runs code
- scripts/scaffold-justfile.sh 3.5 KB runs code
- scripts/scaffold-reset.sh 1.7 KB runs code
- scripts/scaffold-seed.sh 2.4 KB runs code
- scripts/time-to-first-commit.sh 2.3 KB runs code
- scripts/track-attrition.sh 2.3 KB runs code
- scripts/verify.sh 5.0 KB runs code
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 · 119 lines · 166 tokens per session scan A 4a6782d6e19b
dx-harness is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 166 tokens to every session and 1,462 once invoked, about $0.0008 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 2026-09-03.
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