trigger.dev v4.5.0-rc.2

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Self-hosted Docker image: ghcr.io/triggerdotdev/trigger.dev:v4.5.0-rc.2

Release notes

Read the full release notes: https://trigger.dev/changelog/v4-5-0-rc-2

What's changed

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)

Bug fixes

• Fix chat.agent HITL continuations on reasoning-heavy turns. Two changes that work together: (#3719)

All packages: v4.5.0-rc.2

@trigger.dev/build, @trigger.dev/core, @trigger.dev/plugins, @trigger.dev/python, @trigger.dev/react-hooks, @trigger.dev/redis-worker, @trigger.dev/rsc, @trigger.dev/schema-to-json, @trigger.dev/sdk, trigger.dev

Full changelog: https://github.com/triggerdotdev/trigger.dev/compare/v4.4.0.2...v4.5.0-rc.2