Captain custom tools previously used their own hand-rolled `Net::HTTP`
request code. This moves them onto `SafeFetch`, the same shared
HTTP-fetching helper already used by webhooks, uploads, avatar imports,
and the Captain page crawler. Behavior for normal tools is unchanged —
they just now share one consistent path for host resolution, timeouts,
response size limits, and redirect handling.
**What changed**
- `HttpTool#execute_http_request` now delegates to `SafeFetch.fetch`
instead of building `Net::HTTP` requests by hand. Auth headers, basic
auth, metadata headers, JSON content-type, and the 1 MB response cap all
map onto `SafeFetch` options.
- Removed ~80 lines of bespoke request/validation plumbing from
`HttpTool`.
- The custom tools `test` endpoint now reads the response body string
directly (the executor returns the body rather than a response object).
**How to test**
1. Enable `custom_tools` (or `captain_integration_v2`) for an account.
2. Create a Captain custom tool pointing at a public HTTPS endpoint
(e.g. a test API).
3. Use the **Test** button in the tool form — you should get a success
result.
4. Run the tool from a Captain conversation and confirm the response is
returned/templated as before.
**Gotchas**
- **Local dev:** `SafeFetch` blocks requests to private/loopback
addresses by default. If you're testing a custom tool against a service
on `localhost` or a private IP during development, set
`SAFE_FETCH_ALLOW_PRIVATE_NETWORK=true` or the request will be rejected.
(This matches how the rest of `SafeFetch` already behaves locally.)
- **Test endpoint status field:** on success the `test` response now
reports `status: 200` rather than the exact 2xx code (201/204/etc.),
because `SafeFetch` signals success-vs-failure rather than exposing the
raw response. The UI only checks the 2xx range, so this is invisible
there — but worth knowing if anything consumes the API directly.
- **Non-2xx responses** still surface as an error (same as before), now
via `SafeFetch::HttpError`.
