# Pinion

> Use this tool when you need to generate characterization tests for legacy Python code to ensure safe refactoring, as it automatically synthesizes inputs, captures behavior, and emits pytest files. It solves the problem of locking down existing code behavior, allowing for confident refactoring and reducing the risk of introducing bugs. By providing Python functions or class methods as input, Pinion outputs pytest files that can be used to validate code changes.

Canonical page: https://skillsregistry.net/skills/namojo-pinion  
JSON: https://api.skillsregistry.net/v1/skills/namojo-pinion

## Description

AI-powered characterization test generator that reads Python functions or class methods, synthesizes inputs, captures behavior in a sandbox, and emits pytest files to lock legacy code behavior for safe refactoring.

## Trust

- **Trust score (0–1):** 0.68
- **Verification tier:** scanned
- **Last scanned:** 2026-09-01

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** file-system
- **Updated:** 2026-09-01

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/s3bojalkzi)
- **Repository:** <https://github.com/namojo/pinion>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "namojo-pinion"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/namojo-pinion` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/namojo-pinion/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt