# Generate a UUID v5 from an AI agent

You need a stable UUID derived from a namespace and a name, so the same pair gives the same UUID every time, in any system that follows RFC 9562.

Use `uuid-v5-generate@1.0.0`. It is free and needs no key or sign-up. Generate deterministic RFC 9562 UUIDv5 values from a namespace and UTF-8 name.

## Why call a tool for this

A UUID v5 is a SHA-1 hash of the namespace bytes and the name bytes with the version and variant bits set. A model cannot reliably work that out by reasoning.

## Call it over HTTP

```sh
curl -X POST https://computefirst.net/v1/tools/uuid-v5-generate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"namespace":"6ba7b810-9dad-11d1-80b4-00c04fd430c8","name":"www.widgets.com"}'
```

Response:

```json
{
  "result": {
    "uuid": "21f7f8de-8051-5b89-8680-0195ef798b6a"
  }
}
```

## Call it over MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "uuid-v5-generate",
  "version": "1.0.0",
  "input": {
    "namespace": "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
    "name": "www.widgets.com"
  }
}
```

## Check the result

The namespace must be a canonical lowercase UUID. The DNS namespace is 6ba7b810-9dad-11d1-80b4-00c04fd430c8 and the URL namespace is 6ba7b811-9dad-11d1-80b4-00c04fd430c8. The name is limited to 4096 UTF-8 bytes and is not normalized, so two Unicode spellings of the same text give different UUIDs. This tool does not make random UUIDs, and a UUID v5 is not a secret.

Full contract, limits and unsupported cases: [Uuid v5 generate](/tools/uuid-v5-generate).

## Related tools

- [Uuid v3 generate](/tools/uuid-v3-generate)
- [Uuid parse strict](/tools/uuid-parse-strict)