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 instructions/int2t05/engineering-skills/claude-mdgit clone --depth 1 https://github.com/int2t05/engineering-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/instructions/int2t05/engineering-skills/claude-md)<a href="https://agentmods.dev/instructions/int2t05/engineering-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/int2t05/engineering-skills/claude-md.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 | $0.00446 | $0.00446 |
| Opus 5 | $0.00223 | $0.00223 |
| Sonnet 5 | $0.00089 | $0.00089 |
| Haiku 4.5 | $0.00045 | $0.00045 |
Grade A, and why
engineering-skills CLAUDE.md 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.
What it actually says
CLAUDE.md
This is a Claude Code plugin (engineering-skills) — a curated pack of 45 agent
skills organized by the software development lifecycle. See README.md for the full
catalog and install instructions.
Note: this CLAUDE.md is contributor/maintainer documentation for the pack itself. It is NOT auto-loaded into sessions that use the plugin. The SessionStart hook (
hooks/session-start) injectsreferences/engineering-principles.mdas ambient context instead — that is how the discipline reaches every session. Non-Claude agents get the same discipline viaAGENTS.mdat session start.
Conventions
- Skills live under
skills/—skills/meta/plus 9 numbered phase dirs (skills/01-product/throughskills/09-operate/). - Every skill is a folder with SKILL.md (uppercase). See references/skill-anatomy.md — including the
**Output:**declaration convention and the two-layer (project-level + version-level) output pattern for PRD/TECH/PLAN. - Every skill links
${CLAUDE_PLUGIN_ROOT}/references/engineering-principles.md— the distilled discipline. PM-side skills (brainstorm, spec, oss-strategy, research market/tech-selection modes) also linkreferences/product-principles.md; UIUX skills (frontend-design, image-to-code, imagegen, prototype) also linkreferences/design-principles.md— domain discipline layers atop the shared engineering base. - Shared references use
${CLAUDE_PLUGIN_ROOT}/...(portable); in-skill refs use plainreferences/.... - Multi-framework:
AGENTS.md(universal entry) +.agents/(invocation.md,install-block.md) + per-skillagents/openai.yaml(Codex adapter). - Planning uses Claude Code's built-in plan mode (EnterPlanMode/ExitPlanMode), not a skill.
Skill discovery
Run /using-skills (meta) to route a task to the right phase skill, or invoke a skill directly by name.
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 · 24 lines · 446 tokens per session scan A 49e6751c4b49
engineering-skills CLAUDE.md is an instructions file published in the GitHub repository int2t05/engineering-skills (3 stars, last pushed 4d ago), licensed MIT. It adds 446 tokens to every session, about $0.0022 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.
Other instructions, from other repositories
sdlc-graph-engineering CLAUDE.md
Instructions for RonMizrahi/sdlc-graph-engineering, covering sdlc-graph-engineering — repository guide, sources of truth, changing the skill — required, authoring rules and the skill's own standard, applied to itself.
cortex CLAUDE.md
Claude Code instructions for alphaaiservice/cortex, covering claude.md — cortex plugin development context, what is this project?, plugin architecture, directory structure and how each component works.
ship-it open-pr.instructions.md
Instructions for khrichtchatyi/ship-it: When the user asks to open, create, or submit a pull request, follow the skill in skills/open-pr/SKILL.md in full: verify gh is authenticated, resolve the target repository and default branch, push the current branch, open one pull request with a title and body derived from the…
agent-skills CLAUDE.md
Instructions for mindbox-cloud/agent-skills, covering agent-skills — developer guide for claude code, repository purpose, repository structure, how to add a new plugin and step 1 — create the directory structure.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).