Comprehensive guidance for Slack Web API operations with the Go SDK. Use when sending messages, posting to channels, creating or managing channels, retrieving user information, uploading files, composing Block Kit messages, or performing any synchronous Slack API operations.
/plugin marketplace add linehaul-ai/linehaulai-claude-marketplace/plugin install slack-go-sdk@linehaulai-claude-marketplaceThis skill inherits all available tools. When active, it can use any tool Claude has access to.
All Web API methods follow this pattern:
result, err := api.MethodName(params...)
if err != nil {
// Handle error (rate limits, permissions, etc.)
return err
}
// Use result
channelID := "C1234567890"
text := "Hello, Slack!"
_, _, err := api.PostMessage(
channelID,
slack.MsgOptionText(text, false),
)
headerText := slack.NewTextBlockObject("mrkdwn", "*Deployment Complete*", false, false)
headerBlock := slack.NewSectionBlock(headerText, nil, nil)
divider := slack.NewDividerBlock()
bodyText := slack.NewTextBlockObject("mrkdwn", "Version 2.1.0 deployed successfully", false, false)
bodyBlock := slack.NewSectionBlock(bodyText, nil, nil)
_, _, err := api.PostMessage(
channelID,
slack.MsgOptionBlocks(headerBlock, divider, bodyBlock),
)
See web-api-messaging.md for comprehensive messaging patterns including threading, updates, and ephemeral messages.
channelName := "project-updates"
isPrivate := false
channel, err := api.CreateConversation(channelName, isPrivate)
if err != nil {
return err
}
fmt.Printf("Created channel: %s (ID: %s)\n", channel.Name, channel.ID)
params := &slack.GetConversationsParameters{
Types: []string{"public_channel"},
Limit: 100,
}
channels, nextCursor, err := api.GetConversations(params)
See web-api-channels.md for channel management, invites, and metadata operations.
user, err := api.GetUserInfo("U1234567890")
if err != nil {
return err
}
fmt.Printf("User: %s (%s)\n", user.Profile.RealName, user.Profile.Email)
users, err := api.GetUsers()
if err != nil {
return err
}
for _, user := range users {
fmt.Printf("- %s (%s)\n", user.Name, user.ID)
}
See web-api-users.md for user presence, profiles, and groups.
params := slack.FileUploadParameters{
File: "report.pdf",
Channels: []string{"C1234567890"},
Title: "Monthly Report",
}
file, err := api.UploadFile(params)
if err != nil {
return err
}
See web-api-files.md for file downloads, sharing, and multi-part uploads.
Block Kit allows rich, interactive messages. See block-kit-integration.md for:
_, _, err := api.PostMessage(channelID, slack.MsgOptionText(text, false))
if err != nil {
if rateLimitErr, ok := err.(*slack.RateLimitedError); ok {
time.Sleep(rateLimitErr.RetryAfter)
// Retry operation
}
return err
}
slack.RateLimitedError - Too many requestschannel_not_found - Invalid channel IDinvalid_auth - Token issuesFor operations returning large result sets, use cursor-based pagination:
cursor := ""
for {
params := &slack.GetConversationsParameters{
Cursor: cursor,
Limit: 100,
}
channels, nextCursor, err := api.GetConversations(params)
if err != nil {
return err
}
// Process channels...
if nextCursor == "" {
break
}
cursor = nextCursor
}
See pagination-patterns.md for advanced pagination strategies.
Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists' work to avoid copyright violations.
Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.
Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.