eng

eng is a skill for Claude Code from iamvonpasion/hashb. It costs 87 tokens per session (10,436 once invoked), scanned A, original, no licence file.

An engineering-planning skill for making architecture decisions, planning implementations, and reviewing how code should be built. TDD, or test-driven development, means writing tests as part of the implementation process.

In plain words
What is it for?
Use it for greenfield projects, major subsystems, architecture work, implementation reviews, and TDD planning.
Why use it?
It helps turn a defined specification into technical decisions and an implementation plan before or during coding.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the hashb plugin — 19 skills, 1 agent shipped together

Install

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.

agentmods
npx agentmods add skills/iamvonpasion/hashb/eng
Any agent
npx skills add iamvonpasion/hashb --skill eng
Clone the repo
git clone --depth 1 https://github.com/iamvonpasion/hashb

Made for: Claude Code.

Or install hashb, the plugin that ships this one along with the rest of its 19 skills, 1 agent.

Wrote 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.

agentmods badge for eng

README.md
[![agentmods](https://agentmods.dev/badge/skills/iamvonpasion/hashb/eng.svg)](https://agentmods.dev/skills/iamvonpasion/hashb/eng)
Your own site
<a href="https://agentmods.dev/skills/iamvonpasion/hashb/eng"><img src="https://agentmods.dev/badge/skills/iamvonpasion/hashb/eng.svg" alt="Measured on agentmods" height="20"></a>
Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 10,436 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00087 $0.10436
Opus 5 $0.00044 $0.05218
Sonnet 5 $0.00017 $0.02087
Haiku 4.5 $0.00009 $0.01044

Measured 6d ago against content hash a7665ad2ecdd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

eng 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 6d 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.

skills/eng/SKILL.md · 990 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 6d ago First seen · 990 lines · 87 tokens per session scan A a7665ad2ecdd

Subscribe to this mod's changes

eng is a skill published in the GitHub repository iamvonpasion/hashb (2 stars, last pushed 3mo ago), with no licence file. It adds 87 tokens to every session and 10,436 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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