# Can I Use the Humanizer Code Under the MIT License? A Complete Usage Guide

> Yes use Humanizer code freely under the MIT License for commercial and private projects. Learn how to include the copyright notice and license text with this complete guide.

- Repository: [Siqi Chen/humanizer](https://github.com/blader/humanizer)
- Tags: licensing-guide
- Published: 2026-09-11

---

**Yes, you can freely use Humanizer under the MIT License for commercial or private projects, provided you include the original copyright notice and license text from the `LICENSE` file.**

Humanizer is an open-source text refinement tool developed by **blader/humanizer** that transforms AI-generated prose into natural human language. Because the repository is explicitly released under the permissive MIT License, developers can integrate its skill-based architecture without the copyleft restrictions found in GPL-style licenses. This guide examines your exact rights under the license and demonstrates how to leverage the repository's minimal structure.

## Understanding the MIT License Requirements

The MIT License grants you broad legal permission to **use, copy, modify, merge, publish, distribute, sublicense, and sell** copies of the software. According to the `LICENSE` file in the root of the repository, the only mandatory condition is that you include the original copyright notice and permission notice in all copies or substantial portions of the software.

Unlike copyleft licenses, the MIT License imposes no restrictions on how you distribute derivative works. You can incorporate Humanizer into closed-source commercial applications, modify the rewrite patterns for proprietary use, or redistribute the code under different terms, as long as the original attribution remains intact.

## Core Repository Architecture

Humanizer employs a skill-first design that minimizes dependencies and maximizes compatibility across agent platforms. Understanding this structure helps you comply with license requirements while integrating the components correctly.

### The SKILL.md Core

The entire Humanizer skill resides in [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md), a single Markdown file containing the prompt definition, metadata headers, and 25 distinct rewrite patterns. Because this file contains the core intellectual property, any redistribution or modification requires preserving the MIT license notice within the file's context or alongside your distribution.

The metadata header at the top of [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) defines `metadata.version`, which the repository maintains in strict synchronization with the [`README.md`](https://github.com/blader/humanizer/blob/main/README.md) version table and the Claude plugin manifest. This guarantees consistency across all distribution channels.

### Agent Wrappers and Configuration

The repository includes minimal YAML descriptors that point agent platforms to the core skill:

- **[`agents/openai.yaml`](https://github.com/blader/humanizer/blob/main/agents/openai.yaml)**: OpenAPI-compatible descriptor that references the skill file
- **`.claude-plugin/*.json`**: Claude marketplace manifests that enable one-click installation

These wrapper files are also covered under the MIT License, allowing you to modify the agent configurations to suit your infrastructure without legal complication.

### Validation Infrastructure

The [`scripts/validate-package.py`](https://github.com/blader/humanizer/blob/main/scripts/validate-package.py) script verifies that [`README.md`](https://github.com/blader/humanizer/blob/main/README.md), [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md), and plugin JSON files remain synchronized before publication. This prevents version drift and ensures that distributed copies contain consistent metadata, indirectly helping you maintain compliance with attribution requirements.

## How to Use Humanizer in Your Projects

You can integrate Humanizer into your workflow through several methods, all permitted under the MIT License provided you retain the copyright notice.

### Installing via Skills CLI

For global access across your development environment:

```bash
npx skills add blader/humanizer --global

```

This command pulls the latest version from the repository and installs the skill for use with compatible agent platforms.

### Direct Agent Invocation

Once installed, invoke the skill directly within any supported agent interface:

```text
/humanizer

[Paste the AI-generated text you want to "humanize" here]

```

The agent reads the prompt from [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) and applies the 25 rewrite patterns to transform the input.

### Embedding in Custom Agents

You can embed Humanizer into proprietary agent systems by referencing the skill file directly. For OpenAI-compatible implementations:

```yaml

# agents/openai.yaml

name: Humanizer
description: Rewrites AI-sounding prose into natural human language
prompt: |
  {{ read_file('SKILL.md') }}

```

When embedding in commercial products, ensure the `LICENSE` file from the original repository accompanies the [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) file in your distribution, or include the copyright notice in your application's acknowledgments section.

### Running Validation Scripts

Before redistributing modified versions, verify package consistency:

```bash
python3 scripts/validate-package.py

```

This executes validation checks against the metadata headers and file synchronization rules defined in the repository.

## Modification and Redistribution Rights

The MIT License explicitly permits you to **remix the skill** or **embed it in larger systems**. You may:

- Modify the 25 rewrite patterns in [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) to match your brand voice
- Integrate the validation logic into your continuous integration pipeline
- Bundle the agent wrappers with proprietary orchestration tools
- Create derivative works under different license terms

The only immutable requirement is that copies or substantial portions—including modified versions—must include the original copyright notice and the permission notice found in the `LICENSE` file.

## Summary

- **Humanizer is MIT-licensed**, allowing unrestricted use in commercial and private projects without copyleft obligations.
- **Attribution is mandatory**: You must retain the copyright notice and license text found in the `LICENSE` file when distributing the code or substantial portions like [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md).
- **The core skill lives in [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md)**, a single Markdown file containing prompts and rewrite patterns that work across Claude, OpenAI, and other agent platforms.
- **Agent wrappers** in [`agents/openai.yaml`](https://github.com/blader/humanizer/blob/main/agents/openai.yaml) and validation scripts in [`scripts/validate-package.py`](https://github.com/blader/humanizer/blob/main/scripts/validate-package.py) facilitate integration and quality control.
- **Modification is encouraged**: You can alter patterns, embed the skill in proprietary systems, or redistribute under different terms, provided the original MIT license notice accompanies your distribution.

## Frequently Asked Questions

### Do I need to open-source my project if I use Humanizer?

No. The MIT License does not impose copyleft requirements. You can use Humanizer in closed-source, proprietary applications without disclosing your source code. You only need to include the original copyright notice and license text, typically in a `LICENSE` or `NOTICE` file in your distribution.

### Can I modify the SKILL.md patterns for commercial use?

Yes. You are free to modify the 25 rewrite patterns defined in [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) for commercial purposes, including creating proprietary variations for clients or internal tools. Ensure that your modified distribution includes the original MIT license attribution to the blader/humanizer repository.

### Where must I include the MIT license notice?

You must include the license notice in any copy of the software or substantial portions thereof. If you distribute the [`SKILL.md`](https://github.com/blader/humanizer/blob/main/SKILL.md) file, include the `LICENSE` file alongside it. If you embed Humanizer functionality into a larger application, place the copyright notice in your application's credits, about page, or a `THIRD_PARTY_LICENSES` file. The notice must state that the software is Copyright (c) [year] [author] and include the permission text from the original `LICENSE` file.

### Is the validation script also covered by the MIT license?

Yes. The [`scripts/validate-package.py`](https://github.com/blader/humanizer/blob/main/scripts/validate-package.py) utility and all other files in the repository fall under the same MIT License. You can integrate this validation logic into your own build pipelines, modify the script to check your own metadata formats, or distribute it as part of larger tooling suites, subject to the same attribution requirements as the core skill.