What is harness-implementation?

A software-implementation workflow skill for carrying out one technical task from a planned breakdown. It requires the relevant product requirements, architecture, and AGENTS.md instructions as context.

Use it to implement a specific task, check available project integrations, apply the project’s engineering guidance, and verify the result before marking the task complete.

It gives implementation work a defined process and connects coding with testing, debugging, verification, and project rules.

harness-implementation — Skill by thaifurforo/ai-toolkit

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.

Any agent

npx skills add thaifurforo/ai-toolkit --skill harness-implementation

Clone the repo

git clone --depth 1 https://github.com/thaifurforo/ai-toolkit

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/thaifurforo/ai-toolkit/harness-implementation/github.svg)](https://agentmods.dev/skills/thaifurforo/ai-toolkit/harness-implementation)

Your own site

<a href="https://agentmods.dev/skills/thaifurforo/ai-toolkit/harness-implementation"><img src="https://agentmods.dev/badge/skills/thaifurforo/ai-toolkit/harness-implementation/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/thaifurforo/ai-toolkit/harness-implementation"><img src="https://agentmods.dev/badge/skills/thaifurforo/ai-toolkit/harness-implementation.svg" alt="Reviewed on agentmods" width="80" 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 959 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00087	$0.00959
Opus 5.5	$0.00035	$0.00384
Sonnet 5.5	$0.00017	$0.00192
Haiku 4.5	$0.00009	$0.00096

Measured 13d ago against content hash af4a5b28d5f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harness-implementation 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 13d 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/harness-implementation/SKILL.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Harness: Implementação (Etapa 05)

Persona: Engenheiro de software sênior.

Integrações

Verificar disponibilidade antes de usar (consultar harness.config.yaml). Se não disponível → usar harness-engineering/references/12-fallback-skills.md.

executing-plans (se disponível) — gerenciar execução task a task; fallback: 12-fallback-skills.md § executing-plans
test-driven-development (se disponível) — escrever testes antes ou junto; fallback: 12-fallback-skills.md § test-driven-development
systematic-debugging (se disponível) — se a task bloquear por >2 tentativas; fallback: 12-fallback-skills.md § systematic-debugging
verification-before-completion (se disponível) — antes de marcar task concluída; fallback: 12-fallback-skills.md § verification-before-completion
using-git-worktrees (se disponível) — para trabalho paralelo em tasks independentes; fallback: branches sequenciais
context7-mcp (se disponível) — OBRIGATÓRIO antes de usar qualquer biblioteca externa: resolve_library_id → get_library_docs; fallback: busca web
tlc-spec-driven (se disponível) — use trigger implement — TLC gerencia commits atômicos e verificação

Antes de Qualquer Código

⚠️ Crie a branch da task primeiro:
# Sem dependência → base em develop
git checkout develop && git pull
git checkout -b feature/T-[N]-descricao

# Com Depends: T-YY → base na branch da dependência
git checkout feature/T-YY
git checkout -b feature/T-[N]-descricao
Uma task = uma branch. Nunca faça commit de uma task na branch de outra task.

Cadeia de Verificação de Contexto

Antes de escrever qualquer código:

Codebase — existe padrão similar implementado? Se sim, siga-o.
AGENTS.md e .catalog/ — convenções relevantes para esta camada?
Se a task for de UI: .catalog/interface.md + mockups/assets em .catalog/assets/interface/
Context7: resolve_library_id → get_library_docs para cada lib externa
Busca web — apenas se Context7 não cobrir

Read the full file on GitHub · 89 lines

Files

What ships with it

1 file 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.

prompt.md 6.7 KB

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.

13d ago Changed · +1 lines · +25 tokens per session af4a5b28d5f0
2mo ago First seen · 88 lines · 62 tokens per session scan A c8afa020ce2e

Subscribe to this mod's changes

harness-implementation is a skill published in the GitHub repository thaifurforo/ai-toolkit (5 stars, last pushed 14d ago), licensed MIT. It adds 87 tokens to every session and 959 once invoked, about $0.0003 per session on Opus 5.5. 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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