diff --git a/advertisement.go b/advertisement.go
new file mode 100644
index 0000000..75b5f45
--- /dev/null
+++ b/advertisement.go
@@ -0,0 +1,63 @@
+package slackbot
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
+)
+
+type commandAdvertiser interface {
+	AdvertiseCommands(commands []chat1.UserBotCommandInput) error
+}
+
+func (b *Bot) AddAdvertisements(commands ...chat1.UserBotCommandInput) {
+	b.advertisements = append(b.advertisements, commands...)
+}
+
+func (b *Bot) AdvertisedCommands() []chat1.UserBotCommandInput {
+	commands := []chat1.UserBotCommandInput{{
+		Name:                "help",
+		Description:         "Show available commands",
+		Usage:               fmt.Sprintf("!%s help", b.name),
+		ExtendedDescription: b.helpExtendedDescription(),
+	}}
+
+	for _, trigger := range b.triggers() {
+		command := b.commands[trigger]
+		commands = append(commands, chat1.UserBotCommandInput{
+			Name:        trigger,
+			Description: command.Description(),
+			Usage:       fmt.Sprintf("!%s %s", b.name, trigger),
+		})
+	}
+
+	extras := slices.Clone(b.advertisements)
+	slices.SortFunc(extras, func(a, b chat1.UserBotCommandInput) int {
+		return strings.Compare(a.Name, b.Name)
+	})
+	commands = append(commands, extras...)
+
+	return commands
+}
+
+func (b *Bot) advertiseCommands() error {
+	advertiser, ok := b.backend.(commandAdvertiser)
+	if !ok {
+		return nil
+	}
+	return advertiser.AdvertiseCommands(b.AdvertisedCommands())
+}
+
+func (b *Bot) helpExtendedDescription() *chat1.UserBotExtendedDescription {
+	help := strings.TrimSpace(b.resolvedHelp())
+	if help == "" {
+		return nil
+	}
+	return &chat1.UserBotExtendedDescription{
+		Title:       fmt.Sprintf("%s help", b.name),
+		DesktopBody: help,
+		MobileBody:  help,
+	}
+}
diff --git a/bot.go b/bot.go
index 6d93452..c73a3aa 100644
--- a/bot.go
+++ b/bot.go
@@ -11,6 +11,8 @@ import (
 	"sort"
 	"strings"
 	"text/tabwriter"
+
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
 )
 
 type BotCommandRunner interface {
@@ -30,6 +32,7 @@ type Bot struct {
 	label          string
 	config         Config
 	commands       map[string]Command
+	advertisements []chat1.UserBotCommandInput
 	defaultCommand Command
 }
 
@@ -138,12 +141,15 @@ func (b *Bot) run(args []string, command Command, channel string) {
 	}
 }
 
-func (b *Bot) sendHelpMessage(channel string) {
-	help := b.help
-	if help == "" {
-		help = b.HelpMessage()
+func (b *Bot) resolvedHelp() string {
+	if b.help != "" {
+		return b.help
 	}
-	b.backend.SendMessage(help, channel)
+	return b.HelpMessage()
+}
+
+func (b *Bot) sendHelpMessage(channel string) {
+	b.backend.SendMessage(b.resolvedHelp(), channel)
 }
 
 func (b *Bot) SendMessage(text string, channel string) {
@@ -151,6 +157,9 @@ func (b *Bot) SendMessage(text string, channel string) {
 }
 
 func (b *Bot) Listen() {
+	if err := b.advertiseCommands(); err != nil {
+		log.Printf("Error advertising commands: %s", err)
+	}
 	b.backend.Listen(b)
 }
 
diff --git a/bot_test.go b/bot_test.go
index 2b953f8..b8f10c2 100644
--- a/bot_test.go
+++ b/bot_test.go
@@ -5,13 +5,14 @@ package slackbot
 
 import (
 	"testing"
+
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
+	"github.com/stretchr/testify/require"
 )
 
 func TestHelp(t *testing.T) {
 	bot, err := NewTestBot()
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	bot.AddCommand("date", NewExecCommand("/bin/date", nil, true, "Show the current date", &config{}))
 	bot.AddCommand("utc", NewExecCommand("/bin/date", []string{"-u"}, true, "Show the current date (utc)", &config{}))
 	msg := bot.HelpMessage()
@@ -27,3 +28,40 @@ func TestParseInput(t *testing.T) {
 		t.Fatal("Invalid parse")
 	}
 }
+
+func TestAdvertisedCommands(t *testing.T) {
+	bot, err := NewTestBot()
+	require.NoError(t, err)
+	bot.AddCommand("date", NewExecCommand("/bin/date", nil, true, "Show the current date", &config{}))
+	bot.SetHelp("help body")
+	bot.AddAdvertisements(chat1.UserBotCommandInput{
+		Name:        "build",
+		Description: "Build things",
+		Usage:       "!testbot build <target>",
+	})
+
+	commands := bot.AdvertisedCommands()
+	if len(commands) != 3 {
+		t.Fatalf("expected 3 advertised commands, got %d", len(commands))
+	}
+	if commands[0].Name != "help" {
+		t.Fatalf("expected help command first, got %q", commands[0].Name)
+	}
+	if commands[0].ExtendedDescription == nil || commands[0].ExtendedDescription.DesktopBody != "help body" {
+		t.Fatalf("unexpected help extended description: %+v", commands[0].ExtendedDescription)
+	}
+	if commands[1] != (chat1.UserBotCommandInput{
+		Name:        "date",
+		Description: "Show the current date",
+		Usage:       "!testbot date",
+	}) {
+		t.Fatalf("unexpected builtin command: %+v", commands[1])
+	}
+	if commands[2] != (chat1.UserBotCommandInput{
+		Name:        "build",
+		Description: "Build things",
+		Usage:       "!testbot build <target>",
+	}) {
+		t.Fatalf("unexpected extra command: %+v", commands[2])
+	}
+}
diff --git a/kbchat.go b/kbchat.go
index 2d1ea71..09daaa5 100644
--- a/kbchat.go
+++ b/kbchat.go
@@ -42,6 +42,21 @@ func (b *KeybaseChatBotBackend) SendMessage(text string, convID string) {
 	}
 }
 
+func (b *KeybaseChatBotBackend) AdvertiseCommands(commands []chat1.UserBotCommandInput) error {
+	if b.convID == "" {
+		return nil
+	}
+	_, err := b.kbc.AdvertiseCommands(kbchat.Advertisement{
+		Alias: b.name,
+		Advertisements: []chat1.AdvertiseCommandAPIParam{{
+			Typ:      "conv",
+			Commands: commands,
+			ConvID:   b.convID,
+		}},
+	})
+	return err
+}
+
 func (b *KeybaseChatBotBackend) Listen(runner BotCommandRunner) {
 	sub, err := b.kbc.ListenForNewTextMessages()
 	if err != nil {
diff --git a/keybot/keybot.go b/keybot/keybot.go
index ad072b1..fb2f74d 100644
--- a/keybot/keybot.go
+++ b/keybot/keybot.go
@@ -11,6 +11,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
 	"github.com/keybase/slackbot"
 	"github.com/keybase/slackbot/cli"
 	"github.com/keybase/slackbot/launchd"
@@ -311,3 +312,18 @@ func (k *keybot) Help(bot *slackbot.Bot) string {
 	}
 	return out
 }
+
+func (k *keybot) Advertisements(bot *slackbot.Bot) []chat1.UserBotCommandInput {
+	prefix := "!" + bot.Name()
+	return []chat1.UserBotCommandInput{
+		{Name: "build", Description: "Build darwin, mobile, android, or ios artifacts", Usage: prefix + " build <darwin|mobile|android|ios> [flags]"},
+		{Name: "cancel", Description: "Cancel a launchd job by label", Usage: prefix + " cancel <label>"},
+		{Name: "dumplog", Description: "Show the log file for a launchd job", Usage: prefix + " dumplog <label>"},
+		{Name: "gclean", Description: "Clean the go/go-ios/go-android repos", Usage: prefix + " gclean"},
+		{Name: "gdiff", Description: "Show the git diff for a repo under $GOPATH/src", Usage: prefix + " gdiff <repo>"},
+		{Name: "nodeModuleClean", Description: "Clean the ios/android node_modules", Usage: prefix + " nodeModuleClean"},
+		{Name: "release", Description: "Promote or mark releases as broken", Usage: prefix + " release <promote|broken> ..."},
+		{Name: "smoketest", Description: "Set smoketesting status for a build", Usage: prefix + " smoketest --build-a <id> --platform <name> --enable <bool> --max-testers <n>"},
+		{Name: "upgrade", Description: "Upgrade a package", Usage: prefix + " upgrade <name>"},
+	}
+}
diff --git a/keybot/main.go b/keybot/main.go
index 0df1bc5..21b8aaf 100644
--- a/keybot/main.go
+++ b/keybot/main.go
@@ -10,6 +10,7 @@ import (
 	"runtime"
 
 	"github.com/keybase/go-keybase-chat-bot/kbchat"
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
 
 	"github.com/keybase/slackbot"
 	"github.com/keybase/slackbot/launchd"
@@ -68,6 +69,7 @@ func addBasicCommands(bot *slackbot.Bot) {
 type extension interface {
 	Run(b *slackbot.Bot, channel string, args []string) (string, error)
 	Help(bot *slackbot.Bot) string
+	Advertisements(bot *slackbot.Bot) []chat1.UserBotCommandInput
 }
 
 func main() {
@@ -143,6 +145,7 @@ func main() {
 	}
 	bot.SetDefault(slackbot.NewFuncCommand(runFn, "Extension", bot.Config()))
 	bot.SetHelp(bot.HelpMessage() + "\n\n" + ext.Help(bot))
+	bot.AddAdvertisements(ext.Advertisements(bot)...)
 
 	bot.SendMessage("I'm running.", channel)
 
diff --git a/keybot/winbot.go b/keybot/winbot.go
index 79cc430..cafb5a6 100644
--- a/keybot/winbot.go
+++ b/keybot/winbot.go
@@ -16,6 +16,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/keybase/go-keybase-chat-bot/kbchat/types/chat1"
 	"github.com/keybase/slackbot"
 	"github.com/keybase/slackbot/cli"
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
@@ -442,6 +443,19 @@ func (d *winbot) Help(bot *slackbot.Bot) string {
 	return out
 }
 
+func (d *winbot) Advertisements(bot *slackbot.Bot) []chat1.UserBotCommandInput {
+	prefix := "!" + bot.Name()
+	return []chat1.UserBotCommandInput{
+		{Name: "build", Description: "Start a windows build", Usage: prefix + " build [--test] [--client-commit <sha>] [--kbfs-commit <sha>] [--updater-commit <sha>] [--skip-ci] [--smoke] [--dev-cert]"},
+		{Name: "cancel", Description: "Cancel the current windows build", Usage: prefix + " cancel"},
+		{Name: "dumplog", Description: "Show the last windows build log file", Usage: prefix + " dumplog"},
+		{Name: "gclean", Description: "Clean a repo under $GOPATH/src", Usage: prefix + " gclean <repo>"},
+		{Name: "gdiff", Description: "Show the git diff for a repo under $GOPATH/src", Usage: prefix + " gdiff <repo>"},
+		{Name: "restart", Description: "Quit and let the calling script restart the bot", Usage: prefix + " restart"},
+		{Name: "startAutoTimer", Description: "Start or stop the automatic build timer", Usage: prefix + " startAutoTimer [--interval <hours>] [--startHour <hour>] [--delay <hours>]"},
+	}
+}
+
 func Exists(name string) (bool, error) {
 	_, err := os.Stat(name)
 	if os.IsNotExist(err) {