Files
coder/site/src
Kyle Carberry b898e45ec4 feat(site): rewrite localhost URLs in agent chat to port-forward links (#22891)
Uses streamdown's built-in `urlTransform` prop to intercept
`http://localhost:PORT` URLs in agent chat messages and rewrite them to
port-forwarded workspace URLs.

When the agent outputs a bare URL like `http://localhost:3000` or a
markdown link like `[app](http://localhost:8080/path)`, the URL is
rewritten to the workspace's port-forward subdomain (e.g.
`https://3000--agent--workspace--user.wildcard.host`). This makes links
clickable directly from the chat without manual port-forwarding.

## How it works

The transform is built in `AgentDetail` where workspace and proxy
context are available, then threaded as an optional prop through the
component tree:

```
AgentDetail → AgentDetailView → AgentDetailTimeline → ConversationTimeline → Response → Streamdown
```

- Uses streamdown's first-class `urlTransform` API — no monkey-patching
or rehype plugins
- Reuses the existing `portForwardURL()` utility from
`utils/portForward`
- Matches the same localhost detection as the terminal page
(`localhost`, `127.0.0.1`, `0.0.0.0`)
- Preserves pathname and search params
- Gracefully degrades: when any required context is missing (no
workspace, no wildcard proxy host), URLs pass through unchanged

## What gets transformed

| Markdown input | Transformed? |
|---|---|
| `http://localhost:8080` (bare URL, auto-linked by remark-gfm) | Yes |
| `[my app](http://localhost:3000/path)` (explicit link) | Yes |
| `\`http://localhost:8080\`` (inline code) | No (correct — code spans
are literal) |
| `https://example.com` (non-localhost) | No |
2026-03-10 12:57:59 +00:00
..
2025-07-16 14:33:46 -03:00