# Chmod Calculate — REST API endpoint `chmod-calculate`

Convert between numeric (755) and symbolic (rwxr-xr-x) Unix file permissions.

- Category: calculators
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/chmod-calculate/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/api/chmod-calculate/
- Same tool on the other surface: https://findutils.com/mcp/chmod-calculate/

## Call the endpoint (verified example)

```bash
curl -X POST https://api.findutils.com/api/tools/chmod-calculate/execute \
  -H "Content-Type: application/json" \
  -d '{
    "input": "755"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/chmod-calculate
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `input` | string | yes | 3-digit octal like "755" OR 9-char symbolic like "rwxr-xr-x". |

Example arguments (verified):

```json
{
  "input": "755"
}
```

OpenAPI 3.1 spec: https://findutils.com/api/openapi.json · Interactive docs: https://findutils.com/api/docs/

## Also an MCP tool

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Then ask the client to call `findutils:chmod_calculate`. Full MCP reference: https://findutils.com/mcp/chmod-calculate/

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