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/jrenaldi79/harness-engineering/setupnpx skills add jrenaldi79/harness-engineering --skill setupgit clone --depth 1 https://github.com/jrenaldi79/harness-engineeringWhat 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 | $0.00067 | $0.02431 |
| Opus 5 | $0.00034 | $0.01215 |
| Sonnet 5 | $0.00013 | $0.00486 |
| Haiku 4.5 | $0.00007 | $0.00243 |
Grade D, and why
setup scanned grade D with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
SKILL_DIR=$(find ~/.claude/plugins -path "*/setup/SKILL.md" -print -quit | xargs dirname) Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- `.claude/settings.json` with pre-approved commands (test, lint, build, git) and a deny list blocking destructive operations (rm -rf /, git push --force, etc.). Normal file removal still works — Claude prompts for appro How it starts
The opening of the file, as written. The whole thing — 203 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Resource Resolution Preamble
Before any other step, resolve the skill's install directory:
SKILL_DIR=$(find ~/.claude/plugins -path "*/setup/SKILL.md" -print -quit | xargs dirname)
SCRIPTS_DIR=$SKILL_DIR/scripts
TEMPLATES_DIR=$SKILL_DIR/templates
REFERENCES_DIR=$SKILL_DIR/references
If SKILL_DIR is empty, halt and tell the user: "Could not locate the setup plugin directory under ~/.claude/plugins. Verify the plugin is installed."
Phase 1: Detect Environment
Check the working directory for these manifest files: package.json, pyproject.toml, CMakeLists.txt, go.mod, Cargo.toml, Makefile.
Also check for: .git/, src/, existing CLAUDE.md.
Determine:
- New project — no manifest, no
.git/, effectively an empty directory - Existing project — manifest file present; infer language and stack from it
For existing projects, record the detected stack so Phase 2 questions can be skipped where answers are already known.
Phase 2: Socratic Questions
Use the AskUserQuestion tool for each question, one at a time. Adapt or skip questions based on what was detected in Phase 1.
Q1 — Purpose (always ask): "What are you building?" — understand whether this is a web app, REST API, CLI tool, data pipeline, ML project, firmware, mobile app, etc.
Q2 — Language/stack (skip if inferred from manifest): "What language/stack would you like to use?"
Recommend based on the answer to Q1:
- UI/web app → Node/TypeScript (default recommendation)
- Backend API → Node/TypeScript or Python
- Data science / ML → Python
- Firmware / embedded → C/C++
- Systems programming or CLI → Go or Rust
Q3 — Framework (skip if inferred; options depend on stack chosen):
- Node/TS: Express, Fastify, Next.js, NestJS, or none
- Python: FastAPI, Flask, Django, or none
- Go: net/http, Gin, Echo, or none
- C/C++: ask about build system (CMake, Make, Meson) instead of framework
Q4 — Project name (new projects only): "What should the project be called?" — suggest the current directory name as the default.
What ships with it
27 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.
- references/claude-md-guide.md 4.2 KB
- references/enforcement-scripts.md 7.8 KB
- references/stack-node-typescript.md 2.8 KB
- scripts/generate-claude-md.js 5.5 KB runs code
- scripts/hooks/pre-commit 431 B
- scripts/hooks/pre-push 710 B
- scripts/init-project.js 3.8 KB runs code
- scripts/install-enforcement.js 6.5 KB runs code
- scripts/lib/check-file-sizes.js 3.4 KB runs code
- scripts/lib/check-secrets.js 4.0 KB runs code
- scripts/lib/check-test-colocation.js 3.2 KB runs code
- scripts/lib/generate-docs-helpers.js 8.7 KB runs code
- scripts/lib/generate-docs.js 8.7 KB runs code
- scripts/lib/validate-docs.js 6.4 KB runs code
- templates/.env.example 61 B
- templates/.prettierrc 68 B
- templates/eslint-base.js 581 B runs code
- templates/gitignore-template 72 B
- templates/global-claude.md 11 KB
- templates/lint-staged.config.js 54 B runs code
- templates/project-claude.md 11 KB
- templates/rules/code-quality.md 1.3 KB
- templates/rules/react.md 2.5 KB
- templates/rules/tdd.md 3.9 KB
- templates/rules/testing.md 904 B
- templates/rules/typescript.md 1.4 KB
- templates/settings.json 1.2 KB
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.
- 2d ago First seen · 203 lines · 67 tokens per session scan D c7c020fb76b8
setup is a skill published in the GitHub repository jrenaldi79/harness-engineering (66 stars, last pushed 5mo ago), licensed MIT. It adds 67 tokens to every session and 2,431 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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