HTTP GET via Req, returning the body as text.
Arguments:
url(required) —http://orhttps://only; other schemes rejected.timeout_ms(optional, default 10_000).
Response body capped at 1 MB. Redirects followed up to 5 hops.
This is deliberately minimal — it's here so agents can fetch documentation
pages, not to replace a full HTTP client. For richer access (auth headers,
POST bodies, etc.), implement a custom tool that wraps Req directly.