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78a29f58ba
## What
The Claude Code CLI can predict the prompt the user is likely to send
next. This adapter asked for nothing and dropped the `prompt_suggestion`
message. It now asks for the prediction (`promptSuggestions: true`) and
forwards the one prediction of a turn.
ACP has no field for a composer prefill, so the value travels as
```json
{
"sessionUpdate": "session_info_update",
"_meta": { "promptSuggestions": { "suggestions": [{ "text": "Run the tests" }] } }
}
```
The key names no vendor, so another client can read it. AIR already
renders the first non-blank text as gray text in an empty composer,
where Tab fills the composer and sends nothing.
## Behavior
- `suggestions: []` clears the prediction the client holds: at the next
`session/prompt`, because that turn's prediction is spent, and on a
`conversation_reset`, because the transcript it was drawn from is gone.
- A prediction the next prompt outran — the user sent the next prompt
before the adapter read the prediction off the SDK stream — is dropped
instead of published mid-turn.
- A blank prediction never goes on the wire.
- The update is sent only to an AIR client, like the other extension
keys, so non-AIR traffic is unchanged (the key is added to
`AIR_ONLY_META_KEYS`; the `origin/main` scenario baselines stay
byte-identical).
- The CLI predicts nothing on the first turn, after an API error, in
plan mode, and at the usage limit, so a turn without a prediction is
normal. A caller can opt out with
`_meta.claudeCode.options.promptSuggestions: false`.
Documented in `docs/air-extensions.md`.
## Tests
`src/tests/prompt-suggestions.test.ts` covers the wire shape, the
publish after the turn's result, the clear at the next prompt, the
dropped stale prediction, the blank prediction, and a non-AIR client.
`src/tests/create-session-options.test.ts` covers the SDK option and the
caller opt-out.
`npm run check`, `npm run build` and the touched suites are green; the
full `test:run` has pre-existing flakiness on this machine
(session-index watchers, providers) unrelated to this change.
Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>