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## Summary
3 improvements, 1 bug fix.
## Improvements
- The per-turn merge now overlays the wire copy's tool-part state
advancement onto the agent's existing chain — `state` + the matching
resolution field (`output` / `errorText` / `approval`) come from the
wire, everything else (text, reasoning, tool `input`, provider metadata)
stays whatever the snapshot or `hydrateMessages` returned. Previously a
full-message replace overwrote those fields with whatever the client
shipped, so a slimmed wire copy landed a tool call with no `arguments`
on the next LLM call. Covers `output-available` / `output-error` (HITL
`addToolOutput`) and `approval-responded` / `output-denied` (approval
flow).
- `TriggerChatTransport.sendMessages` and `AgentChat.sendRaw` now slim
assistant messages that carry advanced tool parts. The wire payload is
just `{ id, role, parts: [<state + resolution field>] }` for
`submit-message` continuations; everything else passes through.
Reasoning blobs and full tool inputs no longer ride the wire on every
`addToolOutput` / `addToolApproveResponse`, so continuation payloads
stay well under the `.in/append` cap on long agent loops.
- Add `TriggerClient` for running multiple SDK clients side-by-side,
each with its own auth, preview branch, and baseURL. Useful when a
single process needs to trigger tasks or read runs across multiple
projects, environments, or preview branches without mutating shared
global state.
([#3683](https://github.com/triggerdotdev/trigger.dev/pull/3683))
## Bug fixes
- Fix `chat.agent` HITL continuations on reasoning-heavy turns. Two
changes that work together:
([#3719](https://github.com/triggerdotdev/trigger.dev/pull/3719))
<details>
<summary>Raw changeset output</summary>
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`main` is currently in **pre mode** so this branch has prereleases
rather than normal releases. If you want to exit prereleases, run
`changeset pre exit` on `main`.
⚠️⚠️⚠️⚠️⚠️⚠️
# Releases
## @trigger.dev/build@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## trigger.dev@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/build@4.5.0-rc.2`
- `@trigger.dev/core@4.5.0-rc.2`
- `@trigger.dev/schema-to-json@4.5.0-rc.2`
## @trigger.dev/plugins@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/python@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/sdk@4.5.0-rc.2`
- `@trigger.dev/build@4.5.0-rc.2`
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/react-hooks@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/redis-worker@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/rsc@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/schema-to-json@4.5.0-rc.2
### Patch Changes
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/sdk@4.5.0-rc.2
### Patch Changes
- Fix `chat.agent` HITL continuations on reasoning-heavy turns. Two
changes that work together:
([#3719](https://github.com/triggerdotdev/trigger.dev/pull/3719))
- The per-turn merge now overlays the wire copy's tool-part state
advancement onto the agent's existing chain — `state` + the matching
resolution field (`output` / `errorText` / `approval`) come from the
wire, everything else (text, reasoning, tool `input`, provider metadata)
stays whatever the snapshot or `hydrateMessages` returned. Previously a
full-message replace overwrote those fields with whatever the client
shipped, so a slimmed wire copy landed a tool call with no `arguments`
on the next LLM call. Covers `output-available` / `output-error` (HITL
`addToolOutput`) and `approval-responded` / `output-denied` (approval
flow).
- `TriggerChatTransport.sendMessages` and `AgentChat.sendRaw` now slim
assistant messages that carry advanced tool parts. The wire payload is
just `{ id, role, parts: [<state + resolution field>] }` for
`submit-message` continuations; everything else passes through.
Reasoning blobs and full tool inputs no longer ride the wire on every
`addToolOutput` / `addToolApproveResponse`, so continuation payloads
stay well under the `.in/append` cap on long agent loops.
Note: `onValidateMessages` receives the slim wire on HITL turns. If you
call `validateUIMessages` from `ai` against the full `messages` array it
will reject the slim assistant; filter to user messages (or skip on HITL
turns) — see the updated docstring on `onValidateMessages` for the
recommended pattern.
For `hydrateMessages` hooks that persist the chain, this release also
adds a small helper to the `@trigger.dev/sdk/ai` surface:
```ts
import { chat, upsertIncomingMessage } from "@trigger.dev/sdk/ai";
chat.agent({
hydrateMessages: async ({ chatId, trigger, incomingMessages }) => {
const record = await db.chat.findUnique({ where: { id: chatId } });
const stored = record?.messages ?? [];
if (upsertIncomingMessage(stored, { trigger, incomingMessages })) {
await db.chat.update({ where: { id: chatId }, data: { messages: stored }
});
}
return stored;
},
});
```
It pushes fresh user messages by id, no-ops on HITL continuations (the
incoming shares an id with the existing assistant — the runtime overlays
the new tool-state advance), and skips on non-`submit-message` triggers.
Returns `true` if it mutated `stored` so the caller knows whether to
persist.
Net effect: `chat.addToolOutput(...)` /
`chat.addToolApproveResponse(...)` on multi-step reasoning agents
(OpenAI Responses with `store: false`, Anthropic extended thinking,
etc.) no longer blows the cap and no longer corrupts the LLM input.
- Add `TriggerClient` for running multiple SDK clients side-by-side,
each with its own auth, preview branch, and baseURL. Useful when a
single process needs to trigger tasks or read runs across multiple
projects, environments, or preview branches without mutating shared
global state.
([#3683](https://github.com/triggerdotdev/trigger.dev/pull/3683))
```ts
import { TriggerClient } from "@trigger.dev/sdk";
const prod = new TriggerClient({ accessToken:
process.env.TRIGGER_PROD_KEY });
const preview = new TriggerClient({
accessToken: process.env.TRIGGER_PREVIEW_KEY,
previewBranch: "signup-flow",
});
await prod.tasks.trigger("send-email", payload);
await preview.runs.list({ status: ["COMPLETED"] });
```
- Updated dependencies:
- `@trigger.dev/core@4.5.0-rc.2`
## @trigger.dev/core@4.5.0-rc.2
</details>
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