# Code Refactor with Diff and Rationale

> Code Refactor with Diff and Rationale is a paid API for AI agents from linked-aimed-reproduced-changing.trycloudflare.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-12).

Refactors a code snippet while preserving its behavior, returning a unified diff and a written rationale explaining the changes.

## Facts

- Endpoint: POST https://linked-aimed-reproduced-changing.trycloudflare.com/v1/coder/refactor?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/code-refactor-with-diff-and-rationale-df8478c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MAUE_WKArtvpg4AEuhQvi

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability code-refactor-with-diff-and-rationale-df8478c4 -d '<json body>'
```

Example prompt: Can you refactor this Python function to reduce nesting and improve readability — show me the diff and explain what you changed?

```python
def process(data):
    if data:
        if data['active']:
            for item in data['items']:
                if item['valid']:
                    print(item)
```

## When to prefer this

Choose this endpoint when you need both a concrete code diff and a human-readable explanation of why changes were made — ideal for code review workflows, PR preparation, or teaching contexts. Prefer this over a generic chat completion when you need structured diff output with rationale. Use the security audit sibling for vulnerability-focused review, or the code review sibling for numbered correctness findings.

## Known failure modes

- Malformed or empty code input may produce poor-quality or hallucinated refactors
- Very large code snippets may be truncated due to context window limits
- Non-standard or uncommon languages may yield lower-quality suggestions
- Input schema mismatch (choices/usage fields) may cause unexpected behavior
- The model may occasionally introduce subtle behavioral changes despite the behavior-preservation goal

## How this service works

Refactor code while preserving behavior. Returns diff + rationale.

## Output

Returns a unified diff showing exactly what lines changed, plus a written rationale explaining the motivation and reasoning behind each refactoring decision, while guaranteeing behavioral equivalence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "usage": {
   "type": "object"
  },
  "choices": {
   "type": "array"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/code-refactor-with-diff-and-rationale-df8478c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from linked-aimed-reproduced-changing.trycloudflare.com](https://www.zero.xyz/host/linked-aimed-reproduced-changing.trycloudflare.com/llms.txt)