Release notes (Slack announcement)

Lumen ships from one monorepo (LedgerHQ/lumen) as a set of @ledgerhq/lumen-* packages. Releases are coordinated, so the GitHub Releases page lists each package separately with heavily overlapping changes. Compress that into one minimalist Slack message in a fixed format, so every announcement in the channel looks identical.

This is for announcing a release that already shipped. Preparing one — the Nx version plans that cause the bump — is the release-plan skill.

Write standard Markdown, never Slack mrkdwn

The message goes out through the Slack connector, which takes standard Markdown and converts it itself. Pre-converting to Slack's "mrkdwn" dialect is the most common way this goes wrong: the connector passes it through untouched and the channel sees raw markup.

Write this	Not this
**bold**	*bold*
[#774](https://…)	<https://…|#774>
- bullets	a literal •

Output format

**Lumen — New Releases** · {RELEASE_DATE}

**Packages updated**
- `{full-package-name}@{version}`

**Changes**
- {change summary} ([#{PR}](https://github.com/LedgerHQ/lumen/pull/{PR}))

**Breaking changes**
None.

No decorative emoji — the bold headers carry the structure, and the title stays constant. The date goes in the header; if a dump spans several, use the most recent.

Packages updated is a pure version list — one bullet per released package, full npm identifier in backticks, sorted alphabetically by package name. A package whose block holds nothing but 🧱 Updated Dependencies still earns a line, since consumers pin exact versions, but contributes nothing to Changes.

Changes is one de-duplicated list for the whole release, not a per-package breakdown. Dedupe on the distinct change, which is not the same as deduping on the PR number:

• The same change echoed under five packages appears once.
• The same change listed twice under one package — Nx emits both the feat and its follow-up refactor — collapses to one line.
• One PR carrying two unrelated changes stays as two lines, both linking it.

Summarise each as a short noun phrase ("Figma tokens sync", "Point label clamping"), never the verbatim commit subject, and drop the feat: / chore: prefixes. Order by ascending PR number; any stable rule would do, the point is that two people formatting the same dump produce the same message. A change with no PR in the source simply carries no link.

Breaking changes is always present, even when empty. Trust the commit subject, never the version number: Lumen version plans are always patch (the release-plan skill), so a breaking change ships as 0.1.52 → 0.1.53 exactly like a typo fix. Waiting for a major bump misses every breaking change this repo has actually shipped. Scan instead for:

• a ! before the colon — refactor!:, feat(Button)!:
• a BREAKING CHANGE: / BREAKING_CHANGE(Scope): marker, or 💥
• an indented block under a bullet explaining what to migrate to
• an export described as removed, renamed, or made internal

Nothing found → None. Otherwise one bullet each, as - `{package}@{version}` — {what breaks} ([#{PR}](…)), then a final Full changelog: https://github.com/LedgerHQ/lumen/releases line. Say what a consumer has to do — "BaseInput is now internal, use TextInput" beats "BaseInput removed" — split per package when the details differ, and never repeat a breaking entry under Changes.

Reading the dump

Per package block, take the name, the version and date from the ## X.Y.Z (date) line, and each change bullet with its #PR. Drop the rest, including the "❤️ Thank You" contributors block — no names in the announcement.

The Nx release bot files almost everything under ### 🩹 Fixes regardless of prefix, so feat(...) and chore(...) lines routinely sit under a "Fixes" header. Read the subject, not the section it landed in.

Input also arrives hand-written: a title with a date, a few * change lines, and a "Package version update:" list. Those feed Changes and Packages updated respectively; the template is unchanged.

Posting it

These announcements have a dedicated home: #lumen-releases (channel ID C0BCC3YKRLY). That is the default target every time — don't ask which channel unless the user raises it; if they name another, use theirs.

Draft, don't send. Use the Slack connector's draft tool against C0BCC3YKRLY and hand back the draft link. A release announcement lands in front of the whole team, so a human glance is the cheapest place to catch a wrong version or a garbled line. Send directly only if the user explicitly asks to send rather than draft.

If no Slack tool is available, say so plainly and output the message in a fenced code block to copy by hand. Silently dropping the step leaves the user thinking it went out.

Worked examples

references/worked-example.md walks three real releases end to end: a six-package dump with heavy cross-package overlap, a two-package shorthand, and one that broke two packages while bumping as an ordinary patch. Read it once to calibrate how far to compress a change.