> ## Documentation Index
> Fetch the complete documentation index at: https://docs.usesynth.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Stack Changelog

> Public release notes for Stack channels, install paths, handoffs, and operator-facing changes.

Public release notes for Stack. Use this page to understand what changed, what
may break, and which release channel a change belongs to.

<Note>
  The repository changelog is the canonical technical source:
  [`stack/CHANGELOG.md`](https://github.com/synth-laboratories/stack/blob/main/CHANGELOG.md).
  Private launch gates, dogfood evidence, internal waivers, and operator-only
  incident notes live outside the public docs.
</Note>

## Channels

| Channel           | What to expect                                                                                                       |
| ----------------- | -------------------------------------------------------------------------------------------------------------------- |
| `dev` / nightly   | Latest usable Stack from main. Good for dogfood and early feedback. May carry known limitations with rollback notes. |
| release candidate | Short freeze before stable. Fixes, docs, packaging, and evidence only.                                               |
| stable            | Supported public release with documented install, update, support, and rollback or migration posture.                |

## Public Entry Format

Each public entry should include:

* version or nightly id;
* release channel;
* install or update instructions when they changed;
* user-visible additions, changes, fixes, and removed behavior;
* breaking changes with migration steps;
* known limitations that affect first-run or hosted-feature use;
* links to docs, GitHub Release, or issue threads when public.

Do not include private Linear ids, private eval data, secret names, internal
waiver details, customer-specific incidents, or raw proof transcripts here.

## Entries

<Update label="2026-06-29" tags={["stack", "nightly", "planning"]}>
  **Stack nightly channel planning** — release lifecycle, local-first activation,
  terminal auth, and handoff launch bar.

  * **Planned:** Stack will use separate `dev/nightly`, release-candidate, and
    stable channels.
  * **Added planning surface:** `stack doctor`, `stack demo`, and read-only
    `stack update --check` are the first local support, receipt, and manifest
    proof commands for Nightly 1.
  * **Planned:** local Stack should run without Synth signup; Synth sign-in will
    unlock hosted features.
  * **Planned:** public changelog entries will stay user-facing, while private
    evidence and launch gates remain in internal release ledgers.
  * **Current status:** Stack is still internal alpha. Public package-manager
    installation and stable support expectations will be added when those channels
    are live.

  See [Stack Overview](/stack) and the repository
  [`CHANGELOG.md`](https://github.com/synth-laboratories/stack/blob/main/CHANGELOG.md).
</Update>

<Update label="2026-06-26" tags={["stack", "0.1.0", "internal-alpha"]}>
  **Stack `0.1.0` internal alpha** — first distributable Stack release for Synth
  operators.

  * **Added:** OpenTUI cockpit with Codex agent pane, session history, transcript
    tooling, and environment-aware Synth operations.
  * **Added:** `stack-mcp` for local agent access to configured Synth operations.
  * **Added:** local GEPA and dev-slot setup helpers for internal Synth research
    engineering workflows.
  * **Added:** bundled Codex skills for Stack setup, Synth workflows, and Stack
    agent bridge usage.
  * **Status:** internal alpha only. Public GitHub Release and Homebrew install
    paths are not live yet.
</Update>