engineer-harness

engineer-harness is a skill for Claude Code, Codex from wasintoh/toh-framework. It costs 109 tokens per session (2,736 once invoked), scanned A, original, MIT.

A shared working method for coding commands that covers tool choice, verification, reporting, and next steps. It is used by commands for planning, development, fixes, and exploratory coding.

In plain words
What is it for?
Use it when building features, diagnosing or fixing bugs, planning changes, or explaining technical results to someone who is not a developer.
Why use it?
It reduces guesswork by requiring current documentation, reproduction of bugs, and a passing run as evidence that work is complete.

Skill for Claude CodeCodex

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/wasintoh/toh-framework/engineer-harness
Any agent
npx skills add wasintoh/toh-framework --skill engineer-harness
Clone the repo
git clone --depth 1 https://github.com/wasintoh/toh-framework

Made for: Claude Code, Codex.

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 engineer-harness

README.md
[![agentmods](https://agentmods.dev/badge/skills/wasintoh/toh-framework/engineer-harness.svg)](https://agentmods.dev/skills/wasintoh/toh-framework/engineer-harness)
Your own site
<a href="https://agentmods.dev/skills/wasintoh/toh-framework/engineer-harness"><img src="https://agentmods.dev/badge/skills/wasintoh/toh-framework/engineer-harness.svg" alt="Measured on agentmods" height="20"></a>
Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,736 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00109 $0.02736
Opus 5 $0.00055 $0.01368
Sonnet 5 $0.00022 $0.00547
Haiku 4.5 $0.00011 $0.00274

Measured 4d ago against content hash e483c51aa7d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

engineer-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 4d 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.

src/skills/engineer-harness/SKILL.md · 234 lines

How it starts

The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.

🛠️ Engineer Harness Skill

Purpose: Shared harness for the main commands — pick tools like a senior engineer, talk like a human, suggest what's next Version: 1.1.0 For: Toh Framework v2.0.0+ Used by: /toh, /toh-plan, /toh-fix, /toh-vibe (main commands) — MANDATORY · pairs with orchestration-protocol Replaces: the two legacy reporting skills (human report + next-step suggestions), now merged


🎯 Purpose

Three things every engineer-grade delivery needs, in one skill:

  1. Tool Selection Rules — reach for the right tool instead of guessing from memory
  2. Non-dev Communication Mode — report results a non-technical user actually understands
  3. Stage-Aware Next Actions + Announce Contract — never leave the user wondering "what now?"

Golden Rule: "If the user has to ask a follow-up question, the response wasn't complete enough."


🧰 A. Tool Selection Rules

Act like a senior engineer choosing tools — never fake it from memory.

Situation ❌ Don't ✅ Do
Unsure about an API / version Write from memory Search real docs first (Context7 / web) before writing a line
Fixing a bug Diagnose by reading only Reproduce / run it first, then diagnose from evidence
Several independent tasks Do them one by one Delegate in parallel (sub-agents / parallel tool calls)
Before delivering "น่าจะได้แล้ว" / "should work" Build and actually look at the result (open it, run it)
Unfamiliar library Assume the API shape Read the real node_modules types / README

Rule of thumb: evidence over assumption, always. If a fact is checkable, check it before you write.

THE EVIDENCE RULE (verification): Run the check. Quote the failing lines. Fix what the quote shows. Re-run. Only a quoted passing run counts as done. A sub-agent's "done" report is evidence to verify, never proof.


💬 B. Non-dev Communication Mode

The user is usually not a developer. Report like an engineering team that customers love.

Read the full file on GitHub · 234 lines

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. 4d ago First seen · 234 lines · 109 tokens per session scan A e483c51aa7d4

Subscribe to this mod's changes

engineer-harness is a skill published in the GitHub repository wasintoh/toh-framework (95 stars, last pushed yesterday), licensed MIT. It adds 109 tokens to every session and 2,736 once invoked, about $0.0005 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 2026-08-30.

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