Sourced from github.com/slack-go/slack's releases.

v0.23.0

Added

• feat(socketmode): expose socketmode handler dispatcher method by @​nlopes in slack-go/slack#1550
• feat(block): add card and carousel blocks by @​nlopes in slack-go/slack#1551
• feat(assistant): add username and icon to status update by @​charleenwang in slack-go/slack#1553
• feat(block): add alert block by @​nlopes in slack-go/slack#1552

New Contributors

• @​charleenwang made their first contribution in slack-go/slack#1553

Full Changelog: slack-go/slack@v0.22.0...v0.23.0

v0.22.0

What's Changed

Added

• OAuth PKCE support - OAuthOptionCodeVerifier option for GetOAuthV2Response, plus GenerateCodeVerifier() and GenerateCodeChallenge() helpers (RFC 7636). client_secret is now conditionally omitted when empty in both GetOAuthV2ResponseContext and RefreshOAuthV2TokenContext.
• Manifest scope fields - BotOptional and UserOptional on OAuthScopes.
• Rich text styles - Underline, Highlight, ClientHighlight, and Unlink on RichTextSectionTextStyle. Style field on RichTextSectionUserGroupElement.
• Assistant search context - Sort, SortDir, Before, After, Highlight, IncludeContextMessages, IncludeDeletedUsers, IncludeMessageBlocks, IncludeArchivedChannels, DisableSemanticSearch, Modifiers, TermClauses parameters and new response types (AssistantSearchContextFile, AssistantSearchContextChannel, AssistantSearchContextMessageContext).

Fixed

• socketmode: malformed JSON no longer forces reconnect - json.SyntaxError and json.UnmarshalTypeError now emit an EventTypeIncomingError event and continue reading instead of killing the WebSocket connection.
• socketmode: debug_reconnects query param applied correctly - the parameter was silently discarded due to a missing url.RawQuery assignment.
• ChannelTypes and ContentTypes now send comma-separated values instead of repeated form keys, matching the convention used by every other method in the library.

Docs

• assistant:write scope marked as deprecated in favour of chat:write.

Full Changelog: v0.21.1...v0.22.0

v0.21.1

Added

• MessageEvent channel type helpers — New ChannelTypeChannel, ChannelTypeGroup, ChannelTypeIM, and ChannelTypeMPIM constants plus IsChannel(), IsGroup(), IsIM(), and IsMpIM() convenience methods on MessageEvent. No more comparing raw strings to figure out where a message came from:

if ev.IsIM() {
    // handle direct message
}

Fixed

... (truncated)

Sourced from github.com/slack-go/slack's changelog.

[0.23.0] - 2026-04-22

Added

• Block Kit: CardBlock and CarouselBlock — Support for two of the new agent-UI blocks announced in the April 16 Slack changelog. CardBlock is constructed via NewCardBlock with a functional-options pattern and fluent With* builders (WithTitle, WithSubtitle, WithBody, WithIcon, WithHeroImage, WithActions). CarouselBlock is constructed via NewCarouselBlock with a variadic *CardBlock list plus WithBlockID and AddCard helpers. Both blocks wire into Blocks.UnmarshalJSON for round-trip fidelity, and reuse existing ImageBlockElement / ButtonBlockElement / BlockElements types rather than introducing new composition objects.
• Block Kit: AlertBlock — Support for the third of the new agent-UI blocks from the April 16 Slack changelog. AlertBlock is constructed via NewAlertBlock with a *TextBlockObject body and a functional-options pattern. Severity is set via AlertBlockOptionLevel (AlertLevelDefault, AlertLevelInfo, AlertLevelWarning, AlertLevelError, AlertLevelSuccess) and the block ID via AlertBlockOptionBlockID. Wires into Blocks.UnmarshalJSON for round-trip fidelity. Must be delivered via the streaming chunks API — chat.postMessage rejects it as an unsupported block type.
• Streaming-message chunks API — chat.startStream / chat.appendStream / chat.stopStream now accept a chunks parameter. Added MsgOptionChunks along with a StreamChunk interface and four chunk types: MarkdownTextChunk, TaskUpdateChunk, PlanUpdateChunk, and BlocksChunk (each with a New*Chunk constructor). This is the supported transport for streaming Block Kit content and the new agent-UI blocks in particular (which chat.postMessage rejects as Unsupported block type).
• MsgOptionTaskDisplayMode — New option for chat.startStream controlling whether task chunks render as a sequential timeline or a grouped plan. Accepts TaskDisplayModeTimeline or TaskDisplayModePlan.
• Added Username, IconURL, and IconEmoji fields to AssistantThreadsSetStatusParameters, forwarded by SetAssistantThreadsStatusContext, matching the new optional parameters on assistant.threads.setStatus for customising the status-update presentation.
• Exposed SocketmodeHandler.DispatchEvent (previously the unexported dispatcher), enabling integration tests to exercise registered handlers without a live WebSocket connection. The unexported dispatcher is kept as a thin wrapper for backwards compatibility. Closes #1549.

[0.22.0] - 2026-04-12

Added

• Added missing parameters to assistant.search.context (Sort, SortDir, Before,

... (truncated)

• 35d8f31 chore: bump to v0.23.0
• ae59061 feat(block): add alert block (#1552)
• 2df5cfa feat(assistant): add username and icon to status update (#1553)
• e3c0e8b feat(block): add card and carousel blocks (#1551)
• 4c472cd feat(socketmode): expose socketmode handler dispatcher method (#1550)
• f482b19 chore: v0.22.0
• 3a5db9d chore: fix staticcheck errors (#1548)
• 19e0416 ci: add staticcheck
• f7a9616 chore: add staticcheck to mise
• 38dc2b9 chore: simplify with fmt.Fprintf
• Additional commits viewable in compare view

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