Can I use it with any coding agent?

Yes, the kit is designed to work with most agents by supplying a structured prompt and reference material.

Does it modify my existing codebase automatically?

The workflow instructs agents to add only minimal harness pieces while preserving current architecture and tools.

How does it handle sensitive information?

It emphasizes running tasks inside explicit boundaries to keep credentials and hidden files out of agent reach.

harness-starter-kit

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Convert AI coding agent mistakes into reusable repository safeguards.

Autonomous AgentsCoding & Dev 79Open source

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Updated 2026-06-15

What is harness-starter-kit?

Harness Starter Kit is an open-source starter kit designed for developers who regularly use AI coding agents. It focuses on engineering the repository itself rather than endlessly refining prompts, turning observed errors into durable guidance that agents can follow consistently.

The kit works by guiding users to clone a reference structure, inspect the target repo, and apply minimal harness elements such as boundary rules, failure categorization, and improvement loops. Agents receive clear prompts that enforce isolation, diagnosis of issues, and transfer of local conventions without overwriting existing architecture or commands.

It is intended for engineering teams and individual developers who want more reliable, diagnosable, and improvable interactions with coding agents across Python, TypeScript, and other supported stacks.

Capabilities

add repo-specific agent instructions

store failure memory

run drift checks

implement verification workflows

support ai coding agents

What you can build with harness-starter-kit

Safe Task Isolation

Define clear boundaries so agents cannot access sensitive files, credentials, or forbidden paths during routine work.

Failure Diagnosis

Categorize errors into functional, schema, workflow, or timeout types to enable targeted fixes instead of simple pass/fail results.

Convention Preservation

Encode existing API styles, documentation rules, and validation commands so agents follow them on every run.

Install harness-starter-kit

Quick start

claude plugin marketplace add harnessworks/harness-agent-skills-marketplace@v0.1.14
claude plugin install harness-agent-skills@harnessworks

1Clone the harness-starter-kit repository into a ./harness-starter-kit folder inside your target project.
2Open your project in the coding agent environment.
3Paste the adoption prompt from the kit into the agent.
4Let the agent inspect the repository and apply only the minimum useful harness components.
5Review the generated instructions, checks, and memory files before committing changes.