## Summary
Adds the `4.5.0-rc.7` entry to the AI chat changelog, covering the
agent-facing changes in
[v4.5.0-rc.7](https://github.com/triggerdotdev/trigger.dev/releases/tag/v4.5.0-rc.7):
- `chat.headStart` now works with the `chat.customAgent` and
`chat.createSession` backends, not just `chat.agent`
- Opt-in Anthropic system-prompt caching via
`chat.toStreamTextOptions()`
- Three custom-agent-loop fixes: continuation replay, mid-stream
steering, and task-backed tools
- `trigger skills` follow-ups: `trigger-` namespacing, SDK-bundled docs,
and a new cost-savings skill
Generic, non-agent rc.7 items (the CLI uninitialized-project error
message, run-span cost fields) are intentionally left out to keep this
changelog scoped to AI chat agents.
Eric Allam
e5fca6b65e