Skraft - Brownfield Harness Builder

Skraft - Brownfield Harness Builder is an agent for Claude Code from SebastienDegodez/skraft-plugin. It costs 118 tokens per session (959 once invoked), scanned A, original, GPL-3.0.

A preparation workflow for an existing service that creates API contracts, Microcks mocks, and golden-master characterisation tests. These tests record current behaviour so it can be checked after changes.

In plain words
What is it for?
It is for documenting service interfaces, simulating dependencies, and capturing current outputs before restructuring code.
Why use it?
It creates a safety net before refactoring, reducing the risk of changing a service without knowing what its API and current behaviour are.

Agent for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: model in frontmatter.

Part of the skraft plugin — 36 skills, 15 agents, 5 hooks shipped together

Good fit It is for documenting service interfaces, simulating dependencies, and capturing current outputs before restructuring code.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder
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.

Clone the repo
git clone --depth 1 https://github.com/SebastienDegodez/skraft-plugin

Made for: Claude Code.

Or install skraft, the plugin that ships this one along with the rest of its 36 skills, 15 agents, 5 hooks.

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 Skraft - Brownfield Harness Builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder/github.svg)](https://agentmods.dev/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder)
Your own site
<a href="https://agentmods.dev/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder"><img src="https://agentmods.dev/badge/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder/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.

agentmods 80×15 button for Skraft - Brownfield Harness Builder

Your own site · 80×15
<a href="https://agentmods.dev/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder"><img src="https://agentmods.dev/badge/agents/sebastiendegodez/skraft-plugin/brownfield-harness-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 118 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
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 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 $0.00118 $0.00959
Opus 5 $0.00059 $0.00479
Sonnet 5 $0.00024 $0.00192
Haiku 4.5 $0.00012 $0.00096

Measured yesterday against content hash 912ad5246b45, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

Skraft - Brownfield Harness Builder 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 yesterday.

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.

plugins/skraft-framework/agents/brownfield-harness-builder.agent.md · 97 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. yesterday Changed · +42 lines · +90 tokens per session 912ad5246b45
  2. 9d ago First seen · 55 lines · 28 tokens per session scan A e6ed24220c19

Subscribe to this mod's changes

Skraft - Brownfield Harness Builder is an agent published in the GitHub repository SebastienDegodez/skraft-plugin (8 stars, last pushed yesterday), licensed GPL-3.0. It adds 118 tokens to every session and 959 once invoked, about $0.0006 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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