## Summary
7 improvements, 1 bug fix.

## Improvements
- `trigger init` now sets up your AI coding assistant as part of project
setup: pick the MCP server, the agent skills, or both, then scaffold
with the CLI or hand off to your assistant. Adds a new `getting-started`
agent skill that teaches assistants how to bootstrap Trigger.dev
(install the SDK, write `trigger.config.ts`, create a first task, run
`trigger dev`), so the AI-driven setup path works end to end. It ships
in the CLI alongside the existing skills, version-matched to your SDK.
([#3872](#3872))
- `dev` and `deploy` now fail with a clear error when two tasks are
defined with the same id, including across different task types (e.g. a
scheduled task and a regular task sharing an id). Previously the second
definition silently overwrote the first, so one of the tasks would
vanish with no warning. Task ids are detected as duplicates during
indexing (naming each offending id and the files it was found in), and
the same rule is enforced server-side when the background worker is
registered.
([#3865](#3865))
- `trigger skills` installs Trigger.dev agent skills into your coding
agent so it knows how to write tasks, schedules, realtime, and
chat.agent code. The skills ship with the CLI and are copied into each
tool's native skills directory (Claude Code, Cursor, GitHub Copilot, and
Codex / AGENTS.md), and `trigger dev` offers to install them on first
run. ([#3868](#3868))
- Reliability fixes for `chat.agent`. A user message sent while the
agent is streaming is no longer delivered twice (which could run a
duplicate turn), input appends now carry an idempotency key so a retried
send can't duplicate a message, stopping a generation clears the
streaming state so a page reload doesn't replay the stopped turn, and
runs can now carry the full set of dashboard tags instead of being
silently truncated. `onTurnComplete` now fires on errored turns (with
the thrown error attached) and the failed turn's user message is
persisted so it isn't lost on the next run. Custom agents and manual
`chat.writeTurnComplete` callers now trim the output stream, sending a
custom action no longer leaves a second stream reader running, and a
long-lived `watch` subscription no longer grows its dedupe set without
bound. ([#3891](#3891))
- Continuation chat boots no longer stall for around 10 seconds before
the first turn. The `session.in` resume cursor is now found with a
non-blocking records read instead of draining an SSE long-poll (which
always waited out its full 5 second inactivity window, twice per boot),
the boot reads run concurrently, and chat snapshots carry the cursor so
subsequent boots skip the scan entirely.
([#3907](#3907))
- Record client-side dequeue API latency in the supervisor consumer pool
as a Prometheus histogram
(`queue_consumer_pool_dequeue_duration_seconds`, labelled by `outcome`:
success/empty/error).
([#3887](#3887))
- Add `GetProjectEnvironmentsResponseBody` and `ProjectEnvironment`
schemas for the new `GET /api/v1/projects/{projectRef}/environments`
endpoint, which lists the parent environments (dev, staging, preview,
prod) a personal access token can access for a project. Dev is scoped to
the token owner and branch (preview child) environments are excluded.
([#3880](#3880))

## Bug fixes
- Fix two `chat.createSession()` bugs: stopping a generation no longer
wedges the run (the turn loop raced a `totalUsage` promise that never
settles after a stop-abort), and continuation runs now wait for the next
message instead of invoking the model with an empty prompt.
([#3920](#3920))

<details>
<summary>Raw changeset output</summary>

⚠️⚠️⚠️⚠️⚠️⚠️

`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.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## trigger.dev@4.5.0-rc.6

### Patch Changes

- `trigger init` now sets up your AI coding assistant as part of project
setup: pick the MCP server, the agent skills, or both, then scaffold
with the CLI or hand off to your assistant. Adds a new `getting-started`
agent skill that teaches assistants how to bootstrap Trigger.dev
(install the SDK, write `trigger.config.ts`, create a first task, run
`trigger dev`), so the AI-driven setup path works end to end. It ships
in the CLI alongside the existing skills, version-matched to your SDK.
([#3872](#3872))

- `dev` and `deploy` now fail with a clear error when two tasks are
defined with the same id, including across different task types (e.g. a
scheduled task and a regular task sharing an id). Previously the second
definition silently overwrote the first, so one of the tasks would
vanish with no warning. Task ids are detected as duplicates during
indexing (naming each offending id and the files it was found in), and
the same rule is enforced server-side when the background worker is
registered.
([#3865](#3865))

- `trigger skills` installs Trigger.dev agent skills into your coding
agent so it knows how to write tasks, schedules, realtime, and
chat.agent code. The skills ship with the CLI and are copied into each
tool's native skills directory (Claude Code, Cursor, GitHub Copilot, and
Codex / AGENTS.md), and `trigger dev` offers to install them on first
run. ([#3868](#3868))

    ```bash
    trigger skills --target claude-code
    ```

Replaces the previous `install-rules` command, which stays as an alias.

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`
    -   `@trigger.dev/build@4.5.0-rc.6`
    -   `@trigger.dev/schema-to-json@4.5.0-rc.6`

## @trigger.dev/core@4.5.0-rc.6

### Patch Changes

- Reliability fixes for `chat.agent`. A user message sent while the
agent is streaming is no longer delivered twice (which could run a
duplicate turn), input appends now carry an idempotency key so a retried
send can't duplicate a message, stopping a generation clears the
streaming state so a page reload doesn't replay the stopped turn, and
runs can now carry the full set of dashboard tags instead of being
silently truncated. `onTurnComplete` now fires on errored turns (with
the thrown error attached) and the failed turn's user message is
persisted so it isn't lost on the next run. Custom agents and manual
`chat.writeTurnComplete` callers now trim the output stream, sending a
custom action no longer leaves a second stream reader running, and a
long-lived `watch` subscription no longer grows its dedupe set without
bound. ([#3891](#3891))
- Continuation chat boots no longer stall for around 10 seconds before
the first turn. The `session.in` resume cursor is now found with a
non-blocking records read instead of draining an SSE long-poll (which
always waited out its full 5 second inactivity window, twice per boot),
the boot reads run concurrently, and chat snapshots carry the cursor so
subsequent boots skip the scan entirely.
([#3907](#3907))
- Record client-side dequeue API latency in the supervisor consumer pool
as a Prometheus histogram
(`queue_consumer_pool_dequeue_duration_seconds`, labelled by `outcome`:
success/empty/error).
([#3887](#3887))
- `dev` and `deploy` now fail with a clear error when two tasks are
defined with the same id, including across different task types (e.g. a
scheduled task and a regular task sharing an id). Previously the second
definition silently overwrote the first, so one of the tasks would
vanish with no warning. Task ids are detected as duplicates during
indexing (naming each offending id and the files it was found in), and
the same rule is enforced server-side when the background worker is
registered.
([#3865](#3865))
- Add `GetProjectEnvironmentsResponseBody` and `ProjectEnvironment`
schemas for the new `GET /api/v1/projects/{projectRef}/environments`
endpoint, which lists the parent environments (dev, staging, preview,
prod) a personal access token can access for a project. Dev is scoped to
the token owner and branch (preview child) environments are excluded.
([#3880](#3880))

## @trigger.dev/python@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/sdk@4.5.0-rc.6`
    -   `@trigger.dev/core@4.5.0-rc.6`
    -   `@trigger.dev/build@4.5.0-rc.6`

## @trigger.dev/react-hooks@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## @trigger.dev/redis-worker@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## @trigger.dev/rsc@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## @trigger.dev/schema-to-json@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## @trigger.dev/sdk@4.5.0-rc.6

### Patch Changes

- Reliability fixes for `chat.agent`. A user message sent while the
agent is streaming is no longer delivered twice (which could run a
duplicate turn), input appends now carry an idempotency key so a retried
send can't duplicate a message, stopping a generation clears the
streaming state so a page reload doesn't replay the stopped turn, and
runs can now carry the full set of dashboard tags instead of being
silently truncated. `onTurnComplete` now fires on errored turns (with
the thrown error attached) and the failed turn's user message is
persisted so it isn't lost on the next run. Custom agents and manual
`chat.writeTurnComplete` callers now trim the output stream, sending a
custom action no longer leaves a second stream reader running, and a
long-lived `watch` subscription no longer grows its dedupe set without
bound. ([#3891](#3891))
- Continuation chat boots no longer stall for around 10 seconds before
the first turn. The `session.in` resume cursor is now found with a
non-blocking records read instead of draining an SSE long-poll (which
always waited out its full 5 second inactivity window, twice per boot),
the boot reads run concurrently, and chat snapshots carry the cursor so
subsequent boots skip the scan entirely.
([#3907](#3907))
- Fix `chat.headStart` when `hydrateMessages` is registered. The warm
route's step-1 partial now reaches the agent's accumulator on the
hydrate path, so `onTurnComplete` carries the full first turn (the
head-start user message included), tool-call handovers resume from step
2 instead of re-running step 1, and the assistant `messageId` stays
stable across the handover.
([#3907](#3907))
- Preserve reasoning parts across the `chat.headStart` handover.
Extended-thinking models' step-1 reasoning now lands in the durable
session history (and `onTurnComplete`) under the same assistant
`messageId`, with provider metadata intact so Anthropic thinking
signatures survive replays.
([#3907](#3907))
- Fix two `chat.createSession()` bugs: stopping a generation no longer
wedges the run (the turn loop raced a `totalUsage` promise that never
settles after a stop-abort), and continuation runs now wait for the next
message instead of invoking the model with an empty prompt.
([#3920](#3920))
-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

## @trigger.dev/plugins@4.5.0-rc.6

### Patch Changes

-   Updated dependencies:
    -   `@trigger.dev/core@4.5.0-rc.6`

</details>

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>