Core Types

Generated from the actual Rust signatures and rustdoc comments. Builders validate on build(); into_builder() preserves omissions. Error categories and paths are stable; prose may improve.

AlertLevel

Severity levels supported by alert blocks.

Constant	Wire value or payload type	Meaning
`Default`	`default`	Neutral styling.
`Info`	`info`	Informational styling.
`Warning`	`warning`	Warning styling.
`Error`	`error`	Error styling.
`Success`	`success`	Success styling.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

Block

A validated Slack layout block accepted directly by a JSON transport.

Constant	Wire value or payload type	Meaning
`Actions`	`(Box < ActionsBlock >)`	A block that holds interactive elements such as buttons and menus.
`Alert`	`(Box < AlertBlock >)`	A severity-labelled alert, available in modals.
`Card`	`(Box < CardBlock >)`	A compact card with an image, text, and up to three buttons.
`Carousel`	`(Box < CarouselBlock >)`	A horizontally scrolling set of cards, available in messages and App Home.
`Container`	`(Box < ContainerBlock >)`	A titled group of blocks that can optionally collapse.
`ContextActions`	`(Box < ContextActionsBlock >)`	A row of feedback or icon buttons, usually shown below AI-generated content.
`Context`	`(Box < ContextBlock >)`	A block of small, secondary images and text.
`DataTable`	`(Box < DataTableBlock >)`	A sortable, paginated table of raw text, numbers, and rich text.
`DataVisualization`	`(Box < DataVisualizationBlock >)`	A titled pie, bar, area, or line chart.
`Divider`	`(Box < DividerBlock >)`	A horizontal rule that separates blocks.
`File`	`(Box < FileBlock >)`	A remote file previously added with the files.remote API.
`Header`	`(Box < HeaderBlock >)`	Large, bold plain text that introduces a group of blocks.
`Image`	`(Box < ImageBlock >)`	A standalone image with alternative text and an optional title.
`Input`	`(Box < InputBlock >)`	A labelled input that collects a value in a modal, App Home, or message.
`Markdown`	`(Box < MarkdownBlock >)`	Standard markdown rendered by Slack, intended for AI-generated content.
`Plan`	`(Box < PlanBlock >)`	A titled sequence of task cards.
`RichText`	`(Box < RichTextBlock >)`	Formatted text built from sections, lists, preformatted blocks, and quotes.
`Section`	`(Box < SectionBlock >)`	Text, a grid of fields, or both, with an optional accessory element.
`Table`	`(Box < TableBlock >)`	A simple table of raw text and rich text cells.
`TaskCard`	`(Box < TaskCardBlock >)`	One task with its status, details, output, and sources.
`Video`	`(Box < VideoBlock >)`	An embedded video player.

ButtonStyle

Visual emphasis for buttons and confirmation dialogs.

Constant	Wire value or payload type	Meaning
`Primary`	`primary`	Green emphasis for the affirmative action.
`Danger`	`danger`	Red emphasis for destructive actions.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

Chart

A chart that can be displayed by a data visualization block.

Constant	Wire value or payload type	Meaning
`Area`	`(AreaChart)`	An area chart for a data visualization block.
`Bar`	`(BarChart)`	A bar chart for a data visualization block.
`Line`	`(LineChart)`	A line chart for a data visualization block.
`Pie`	`(PieChart)`	A pie chart for a data visualization block.

ColumnAlign

Horizontal alignment for table columns.

Constant	Wire value or payload type	Meaning
`Left`	`left`	Align cell content to the left.
`Center`	`center`	Center cell content.
`Right`	`right`	Align cell content to the right.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

ContainerWidth

Widths supported by Slack container blocks.

Constant	Wire value or payload type	Meaning
`Narrow`	`narrow`	A compact container.
`Standard`	`standard`	Slack's standard container width.
`Wide`	`wide`	A wide container.
`Full`	`full`	The full available width.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

ContextActionsElement

A value that can appear in a context actions block: feedback buttons or an icon button.

Constant	Wire value or payload type	Meaning
`FeedbackButtons`	`(Box < FeedbackButtonsElement >)`	A pair of thumbs-up and thumbs-down feedback buttons.
`IconButton`	`(Box < IconButtonElement >)`	A button that shows an icon instead of text.

ContextElement

A value that can appear in a context block: an image element or a text object.

Constant	Wire value or payload type	Meaning
`ImageElement`	`(ImageElement)`	An image displayed inside a section, context, or card.
`MarkdownText`	`(MarkdownText)`	A mrkdwn text composition object.
`PlainText`	`(PlainText)`	A plain-text composition object.

DataTableCell

A value that can appear as a data table cell: raw text, a raw number, or a rich text block.

Constant	Wire value or payload type	Meaning
`RichText`	`(RichTextBlock)`	Formatted text built from sections, lists, preformatted blocks, and quotes.
`RawNumber`	`(RawNumber)`	A numeric data table cell with display text.
`RawText`	`(RawText)`	An unformatted table cell.

Element

A validated interactive, visual, or input element nested inside a Slack block.

Constant	Wire value or payload type	Meaning
`Button`	`(Box < ButtonElement >)`	An interactive button that sends a payload or opens a URL.
`ChannelMultiSelect`	`(Box < ChannelMultiSelectElement >)`	A menu for selecting multiple public channels.
`ChannelSelect`	`(Box < ChannelSelectElement >)`	A menu for selecting one public channel.
`Checkboxes`	`(Box < CheckboxesElement >)`	A group of checkboxes.
`ConversationMultiSelect`	`(Box < ConversationMultiSelectElement >)`	A menu for selecting multiple conversations.
`ConversationSelect`	`(Box < ConversationSelectElement >)`	A menu for selecting one conversation.
`DatePicker`	`(Box < DatePickerElement >)`	A calendar date picker.
`DateTimePicker`	`(Box < DateTimePickerElement >)`	A combined date and time picker.
`EmailInput`	`(Box < EmailInputElement >)`	A single-line input that accepts an email address.
`ExternalMultiSelect`	`(Box < ExternalMultiSelectElement >)`	A menu for selecting multiple options loaded from your app.
`ExternalSelect`	`(Box < ExternalSelectElement >)`	A menu for selecting one option loaded from your app.
`FeedbackButtons`	`(Box < FeedbackButtonsElement >)`	A pair of thumbs-up and thumbs-down feedback buttons.
`FileInput`	`(Box < FileInputElement >)`	An input that lets users upload files.
`IconButton`	`(Box < IconButtonElement >)`	A button that shows an icon instead of text.
`Image`	`(Box < ImageElement >)`	An image displayed inside a section, context, or card.
`NumberInput`	`(Box < NumberInputElement >)`	An input that accepts whole or decimal numbers.
`Overflow`	`(Box < OverflowElement >)`	A compact menu of up to five options.
`PlainTextInput`	`(Box < PlainTextInputElement >)`	A single-line or multi-line free-text input.
`RadioButtons`	`(Box < RadioButtonsElement >)`	A group of radio buttons.
`RichTextInput`	`(Box < RichTextInputElement >)`	An input that accepts formatted rich text.
`StaticMultiSelect`	`(Box < StaticMultiSelectElement >)`	A menu for selecting multiple options defined in the payload.
`StaticSelect`	`(Box < StaticSelectElement >)`	A menu for selecting one option defined in the payload.
`TimePicker`	`(Box < TimePickerElement >)`	A time-of-day picker.
`UrlInput`	`(Box < UrlInputElement >)`	A single-line input that accepts a URL.
`UserMultiSelect`	`(Box < UserMultiSelectElement >)`	A menu for selecting multiple workspace users.
`UserSelect`	`(Box < UserSelectElement >)`	A menu for selecting one workspace user.
`WorkflowButton`	`(Box < WorkflowButtonElement >)`	A button that starts a workflow through a link trigger.

IconButtonIcon

Icons supported by icon buttons.

Constant	Wire value or payload type	Meaning
`Trash`	`trash`	A trash can, for delete actions.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

InputElement

An element that can be placed in an input block.

Constant	Wire value or payload type	Meaning
`ChannelMultiSelect`	`(Box < ChannelMultiSelectElement >)`	A menu for selecting multiple public channels.
`ChannelSelect`	`(Box < ChannelSelectElement >)`	A menu for selecting one public channel.
`Checkboxes`	`(Box < CheckboxesElement >)`	A group of checkboxes.
`ConversationMultiSelect`	`(Box < ConversationMultiSelectElement >)`	A menu for selecting multiple conversations.
`ConversationSelect`	`(Box < ConversationSelectElement >)`	A menu for selecting one conversation.
`DatePicker`	`(Box < DatePickerElement >)`	A calendar date picker.
`DateTimePicker`	`(Box < DateTimePickerElement >)`	A combined date and time picker.
`EmailInput`	`(Box < EmailInputElement >)`	A single-line input that accepts an email address.
`ExternalMultiSelect`	`(Box < ExternalMultiSelectElement >)`	A menu for selecting multiple options loaded from your app.
`ExternalSelect`	`(Box < ExternalSelectElement >)`	A menu for selecting one option loaded from your app.
`FileInput`	`(Box < FileInputElement >)`	An input that lets users upload files.
`NumberInput`	`(Box < NumberInputElement >)`	An input that accepts whole or decimal numbers.
`PlainTextInput`	`(Box < PlainTextInputElement >)`	A single-line or multi-line free-text input.
`RadioButtons`	`(Box < RadioButtonsElement >)`	A group of radio buttons.
`RichTextInput`	`(Box < RichTextInputElement >)`	An input that accepts formatted rich text.
`StaticMultiSelect`	`(Box < StaticMultiSelectElement >)`	A menu for selecting multiple options defined in the payload.
`StaticSelect`	`(Box < StaticSelectElement >)`	A menu for selecting one option defined in the payload.
`TimePicker`	`(Box < TimePickerElement >)`	A time-of-day picker.
`UrlInput`	`(Box < UrlInputElement >)`	A single-line input that accepts a URL.
`UserMultiSelect`	`(Box < UserMultiSelectElement >)`	A menu for selecting multiple workspace users.
`UserSelect`	`(Box < UserSelectElement >)`	A menu for selecting one workspace user.

JsonNumber

A JSON integer, unsigned integer, or finite floating-point number.

Integers retain their precision through i64::MIN..=u64::MAX. Arbitrary precision values that cannot round-trip through the supported representation are rejected, including when a consumer enables serde_json's optional features.

as_number

Borrows the validated Serde JSON number.

fn as_number(&self) -> &Number

PlainTextInput

A plain-text builder argument: either an owned string or validated plain text.

ResponseType

Visibility of a slash-command or interaction response.

Constant	Wire value or payload type	Meaning
`InChannel`	`in_channel`	Visible to everyone in the channel.
`Ephemeral`	`ephemeral`	Visible only to the user who triggered the response.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

RichTextBlockElement

A top-level element of a rich text block: a section, list, preformatted block, or quote.

Constant	Wire value or payload type	Meaning
`CodeBlock`	`(RichTextCodeBlock)`	A preformatted code block inside rich text.
`List`	`(RichTextList)`	A bulleted or numbered list inside rich text.
`Quote`	`(RichTextQuote)`	A quotation inside rich text.
`Section`	`(RichTextSection)`	A paragraph of inline rich text elements.

RichTextListStyle

Marker styles for rich text lists.

Constant	Wire value or payload type	Meaning
`Bullet`	`bullet`	An unordered, bulleted list.
`Ordered`	`ordered`	A numbered list.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

RichTextSectionElement

An inline rich text element: text, a link, an emoji, or a channel, user, or user group mention.

Constant	Wire value or payload type	Meaning
`Channel`	`(RichTextChannel)`	A channel mention inside rich text.
`Emoji`	`(RichTextEmoji)`	An emoji inside rich text.
`Link`	`(RichTextLink)`	A hyperlink inside rich text.
`Text`	`(RichTextText)`	A run of optionally styled text inside rich text.
`User`	`(RichTextUser)`	A user mention inside rich text.
`UserGroup`	`(RichTextUserGroup)`	A user group mention inside rich text.

RichTextStyle

Optional rich-text style flags. Each receiving element validates its allowed subset.

new

Starts an empty style, with every flag omitted.

fn new() -> Self

bold

Sets the bold flag, retaining explicit false.

fn bold(mut self, value: bool) -> Self

is_bold

Returns the supplied bold flag.

fn is_bold(&self) -> Option<bool>

client_highlight

Sets the client_highlight flag, retaining explicit false.

fn client_highlight(mut self, value: bool) -> Self

is_client_highlight

Returns the supplied client_highlight flag.

fn is_client_highlight(&self) -> Option<bool>

code

Sets the code flag, retaining explicit false.

fn code(mut self, value: bool) -> Self

is_code

Returns the supplied code flag.

fn is_code(&self) -> Option<bool>

highlight

Sets the highlight flag, retaining explicit false.

fn highlight(mut self, value: bool) -> Self

is_highlight

Returns the supplied highlight flag.

fn is_highlight(&self) -> Option<bool>

italic

Sets the italic flag, retaining explicit false.

fn italic(mut self, value: bool) -> Self

is_italic

Returns the supplied italic flag.

fn is_italic(&self) -> Option<bool>

strike

Sets the strike flag, retaining explicit false.

fn strike(mut self, value: bool) -> Self

is_strike

Returns the supplied strike flag.

fn is_strike(&self) -> Option<bool>

unlink

Sets the unlink flag, retaining explicit false.

fn unlink(mut self, value: bool) -> Self

is_unlink

Returns the supplied unlink flag.

fn is_unlink(&self) -> Option<bool>

SPEC_VERSION

Version of the shared Slack Block Kit contract.

TableCell

A value that can appear as a table block cell: raw text or a rich text block.

Constant	Wire value or payload type	Meaning
`RichText`	`(RichTextBlock)`	Formatted text built from sections, lists, preformatted blocks, and quotes.
`RawText`	`(RawText)`	An unformatted table cell.

TaskStatus

States supported by task card blocks.

Constant	Wire value or payload type	Meaning
`Pending`	`pending`	The task has not started.
`InProgress`	`in_progress`	The task is running.
`Complete`	`complete`	The task finished successfully.
`Error`	`error`	The task failed.

as_str

Returns the Slack wire spelling.

const fn as_str(self) -> &'static str

Text

A Slack text composition object: plain text or mrkdwn.

Constant	Wire value or payload type	Meaning
`Markdown`	`(MarkdownText)`	A mrkdwn text composition object.
`Plain`	`(PlainText)`	A plain-text composition object.

TextInput

A text builder argument. Strings use the receiving field's documented text kind. There is deliberately no global string-to-Text conversion.

VERSION

The Cargo package version; independent of the shared specification version.

AlertLevel​

as_str​

Block​

ButtonStyle​

as_str​

Chart​

ColumnAlign​

as_str​

ContainerWidth​

as_str​

ContextActionsElement​

ContextElement​

DataTableCell​

Element​

IconButtonIcon​

as_str​

InputElement​

JsonNumber​

as_number​

PlainTextInput​

ResponseType​

as_str​

RichTextBlockElement​

RichTextListStyle​

as_str​

RichTextSectionElement​

RichTextStyle​

new​

bold​

is_bold​

client_highlight​

is_client_highlight​

code​

is_code​

highlight​

is_highlight​

italic​

is_italic​

strike​

is_strike​

unlink​

is_unlink​

SPEC_VERSION​

TableCell​

TaskStatus​

as_str​

Text​

TextInput​

VERSION​

AlertLevel

as_str

Block

ButtonStyle

as_str

Chart

ColumnAlign

as_str

ContainerWidth

as_str

ContextActionsElement

ContextElement

DataTableCell

Element

IconButtonIcon

as_str

InputElement

JsonNumber

as_number

PlainTextInput

ResponseType

as_str

RichTextBlockElement

RichTextListStyle

as_str

RichTextSectionElement

RichTextStyle

new

bold

is_bold

client_highlight

is_client_highlight

code

is_code

highlight

is_highlight

italic

is_italic

strike

is_strike

unlink

is_unlink

SPEC_VERSION

TableCell

TaskStatus

as_str

Text

TextInput

VERSION