feat(channels): add teams_webhook output-only channel (#2244)

Add Microsoft Teams webhook integration via Power Automate workflows.

Features:
- Output-only channel for sending notifications to Teams
- Multiple webhook targets with named configuration
- Required "default" target with automatic fallback
- Rich Adaptive Card formatting with full-width rendering
- Markdown table conversion to native Adaptive Card Tables
- Column widths based on header content length
- HTTPS-only webhook URL validation
- Proper error classification for retry behavior

Configuration:
- channels.teams_webhook.enabled: bool
- channels.teams_webhook.webhooks: map of named targets
  - Each target has webhook_url (SecureString) and optional title

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/SevereCloud/vksdk/v3 v3.3.1
 	github.com/adhocore/gronx v1.19.6
 	github.com/anthropics/anthropic-sdk-go v1.26.0
+	github.com/atc0005/go-teams-notify/v2 v2.14.0
 	github.com/atotto/clipboard v0.1.4
 	github.com/aws/aws-sdk-go-v2 v1.41.5
 	github.com/aws/aws-sdk-go-v2/config v1.32.12

go.sum

@@ -21,6 +21,8 @@ github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwTo
 github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/anthropics/anthropic-sdk-go v1.26.0 h1:oUTzFaUpAevfuELAP1sjL6CQJ9HHAfT7CoSYSac11PY=
 github.com/anthropics/anthropic-sdk-go v1.26.0/go.mod h1:qUKmaW+uuPB64iy1l+4kOSvaLqPXnHTTBKH6RVZ7q5Q=
+github.com/atc0005/go-teams-notify/v2 v2.14.0 h1:7N+xw+COnYANLREaAveQ65rsNQ12nIZJED9nMLyscCo=
+github.com/atc0005/go-teams-notify/v2 v2.14.0/go.mod h1:EECsWM2b0Hvoz7O+QdlsvyN2KCUOFQCGj8bUBXv3A3Q=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/aws/aws-sdk-go-v2 v1.41.5 h1:dj5kopbwUsVUVFgO4Fi5BIT3t4WyqIDjGKCangnV/yY=

pkg/channels/manager.go

@@ -430,6 +430,19 @@ func (m *Manager) initChannels(channels *config.ChannelsConfig) error {
 		m.initChannel("vk", "VK")
 	}
 
+	if channels.TeamsWebhook.Enabled && len(channels.TeamsWebhook.Webhooks) > 0 {
+		hasValidTarget := false
+		for _, target := range channels.TeamsWebhook.Webhooks {
+			if target.WebhookURL.String() != "" {
+				hasValidTarget = true
+				break
+			}
+		}
+		if hasValidTarget {
+			m.initChannel("teams_webhook", "Teams Webhook")
+		}
+	}
+
 	logger.InfoCF("channels", "Channel initialization completed", map[string]any{
 		"enabled_channels": len(m.channels),
 	})

pkg/channels/manager_channel.go

@@ -62,6 +62,13 @@ func hiddenValues(key string, value map[string]any, ch config.ChannelsConfig) {
 		value["app_secret"] = ch.Feishu.AppSecret.String()
 		value["encrypt_key"] = ch.Feishu.EncryptKey.String()
 		value["verification_token"] = ch.Feishu.VerificationToken.String()
+	case "teams_webhook":
+		// Expose webhook URLs for hash computation (they contain secrets)
+		webhooks := make(map[string]string)
+		for name, target := range ch.TeamsWebhook.Webhooks {
+			webhooks[name] = target.WebhookURL.String()
+		}
+		value["webhooks"] = webhooks
 	}
 }
 
@@ -166,4 +173,13 @@ func updateKeys(newcfg, old *config.ChannelsConfig) {
 		newcfg.Feishu.EncryptKey = old.Feishu.EncryptKey
 		newcfg.Feishu.VerificationToken = old.Feishu.VerificationToken
 	}
+	if newcfg.TeamsWebhook.Enabled {
+		// Copy SecureString webhook URLs from old config
+		for name, oldTarget := range old.TeamsWebhook.Webhooks {
+			if newTarget, ok := newcfg.TeamsWebhook.Webhooks[name]; ok {
+				newTarget.WebhookURL = oldTarget.WebhookURL
+				newcfg.TeamsWebhook.Webhooks[name] = newTarget
+			}
+		}
+	}
 }

pkg/channels/teams_webhook/init.go

@@ -0,0 +1,13 @@
+package teamswebhook
+
+import (
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/channels"
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+func init() {
+	channels.RegisterFactory("teams_webhook", func(cfg *config.Config, b *bus.MessageBus) (channels.Channel, error) {
+		return NewTeamsWebhookChannel(cfg.Channels.TeamsWebhook, b)
+	})
+}

pkg/channels/teams_webhook/teams_webhook.go

@@ -0,0 +1,422 @@
+package teamswebhook
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+
+	goteamsnotify "github.com/atc0005/go-teams-notify/v2"
+	"github.com/atc0005/go-teams-notify/v2/adaptivecard"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/channels"
+	"github.com/sipeed/picoclaw/pkg/config"
+	"github.com/sipeed/picoclaw/pkg/logger"
+)
+
+// statusCodeRe extracts HTTP status codes from error messages like "401 Unauthorized".
+var statusCodeRe = regexp.MustCompile(`\b([45]\d{2})\b`)
+
+// markdownTableRe matches a markdown table block (header + separator + rows).
+// It captures the entire table including all rows.
+var markdownTableRe = regexp.MustCompile(`(?m)^(\|[^\n]+\|)\n(\|[-:\|\s]+\|)\n((?:\|[^\n]+\|\n?)+)`)
+
+// teamsMessageSender abstracts the Teams client for testability.
+type teamsMessageSender interface {
+	SendWithContext(ctx context.Context, webhookURL string, message goteamsnotify.TeamsMessage) error
+}
+
+// classifyTeamsError extracts HTTP status code from error message and classifies it.
+// The go-teams-notify library returns errors like "error on notification: 401 Unauthorized, ...".
+// This allows proper retry behavior: 4xx errors are permanent, 5xx are temporary.
+func classifyTeamsError(err error) error {
+	if err == nil {
+		return nil
+	}
+	errMsg := err.Error()
+	if matches := statusCodeRe.FindStringSubmatch(errMsg); len(matches) > 1 {
+		if statusCode, parseErr := strconv.Atoi(matches[1]); parseErr == nil {
+			return channels.ClassifySendError(statusCode, err)
+		}
+	}
+	// Fallback: treat as temporary network error (retryable)
+	return channels.ClassifyNetError(err)
+}
+
+// TeamsWebhookChannel is an output-only channel that sends messages
+// to Microsoft Teams via Power Automate workflow webhooks.
+// Multiple webhook targets can be configured and selected via ChatID.
+type TeamsWebhookChannel struct {
+	*channels.BaseChannel
+	config config.TeamsWebhookConfig
+	client teamsMessageSender
+}
+
+// NewTeamsWebhookChannel creates a new Teams webhook channel.
+func NewTeamsWebhookChannel(
+	cfg config.TeamsWebhookConfig,
+	bus *bus.MessageBus,
+) (*TeamsWebhookChannel, error) {
+	if len(cfg.Webhooks) == 0 {
+		return nil, fmt.Errorf("teams_webhook: at least one webhook target is required")
+	}
+
+	// Require "default" webhook target
+	if _, hasDefault := cfg.Webhooks["default"]; !hasDefault {
+		return nil, fmt.Errorf("teams_webhook: a 'default' webhook target is required")
+	}
+
+	// Validate all webhook targets have valid HTTPS URLs
+	for name, target := range cfg.Webhooks {
+		webhookURL := target.WebhookURL.String()
+		if webhookURL == "" {
+			return nil, fmt.Errorf("teams_webhook: webhook %q has empty webhook_url", name)
+		}
+		parsed, err := url.Parse(webhookURL)
+		if err != nil {
+			return nil, fmt.Errorf("teams_webhook: webhook %q has invalid URL: %w", name, err)
+		}
+		if !strings.EqualFold(parsed.Scheme, "https") {
+			return nil, fmt.Errorf("teams_webhook: webhook %q must use HTTPS (got %q)", name, parsed.Scheme)
+		}
+	}
+
+	base := channels.NewBaseChannel(
+		"teams_webhook",
+		cfg,
+		bus,
+		[]string{
+			"*",
+		}, // Output-only channel; "*" suppresses misleading "allows EVERYONE" audit warning
+		channels.WithMaxMessageLength(24000), // Power Automate webhook payload limit is 28KB
+	)
+
+	client := goteamsnotify.NewTeamsClient()
+
+	return &TeamsWebhookChannel{
+		BaseChannel: base,
+		config:      cfg,
+		client:      client,
+	}, nil
+}
+
+// Start initializes the channel. For output-only channels, this is a no-op.
+func (c *TeamsWebhookChannel) Start(ctx context.Context) error {
+	targets := make([]string, 0, len(c.config.Webhooks))
+	for name := range c.config.Webhooks {
+		targets = append(targets, name)
+	}
+	sort.Strings(targets)
+	logger.InfoCF("teams_webhook", "Starting Teams webhook channel (output-only)", map[string]any{
+		"targets": targets,
+	})
+	c.SetRunning(true)
+	return nil
+}
+
+// Stop shuts down the channel.
+func (c *TeamsWebhookChannel) Stop(ctx context.Context) error {
+	logger.InfoC("teams_webhook", "Stopping Teams webhook channel")
+	c.SetRunning(false)
+	return nil
+}
+
+// Send delivers a message to the specified Teams webhook target.
+// The target is selected by msg.ChatID which must match a key in the webhooks map.
+func (c *TeamsWebhookChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]string, error) {
+	if !c.IsRunning() {
+		return nil, channels.ErrNotRunning
+	}
+
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+	}
+
+	// Look up webhook target by ChatID, fall back to "default" if empty or unknown
+	targetName := msg.ChatID
+	if targetName == "" {
+		targetName = "default"
+	}
+
+	target, ok := c.config.Webhooks[targetName]
+	if !ok {
+		// Log warning and fall back to default target
+		logger.WarnCF("teams_webhook", "Unknown target, falling back to default", map[string]any{
+			"requested": msg.ChatID,
+			"using":     "default",
+		})
+		target = c.config.Webhooks["default"]
+	}
+
+	// Build an Adaptive Card for rich formatting
+	card, err := c.buildAdaptiveCard(msg, target)
+	if err != nil {
+		return nil, fmt.Errorf("teams_webhook: failed to build card: %w", err)
+	}
+
+	// Create the message with the card
+	teamsMsg, err := adaptivecard.NewMessageFromCard(card)
+	if err != nil {
+		return nil, fmt.Errorf("teams_webhook: failed to create message: %w", err)
+	}
+
+	// Send to Teams
+	if err := c.client.SendWithContext(ctx, target.WebhookURL.String(), teamsMsg); err != nil {
+		// Log without raw error to avoid leaking webhook URL (embedded in net/http errors)
+		logger.ErrorCF("teams_webhook", "Failed to send message to Teams webhook", map[string]any{
+			"target": msg.ChatID,
+		})
+		// Classify error based on status code extracted from error message.
+		// The go-teams-notify library includes status in errors like "401 Unauthorized".
+		// Use ClassifySendError for proper retry behavior (4xx = permanent, 5xx = temporary).
+		classifiedErr := classifyTeamsError(err)
+		return nil, fmt.Errorf("teams_webhook: send failed: %w", classifiedErr)
+	}
+
+	logger.DebugCF("teams_webhook", "Message sent successfully", map[string]any{
+		"target": msg.ChatID,
+	})
+
+	return nil, nil
+}
+
+// buildAdaptiveCard creates a formatted Adaptive Card from the outbound message.
+// It detects markdown tables and converts them to native Adaptive Card Table elements,
+// since TextBlocks only support a limited markdown subset (no tables).
+func (c *TeamsWebhookChannel) buildAdaptiveCard(
+	msg bus.OutboundMessage,
+	target config.TeamsWebhookTarget,
+) (adaptivecard.Card, error) {
+	card := adaptivecard.NewCard()
+	card.Type = adaptivecard.TypeAdaptiveCard
+
+	// Set full width for Teams rendering
+	card.MSTeams.Width = "Full"
+
+	// Add title if configured on the target
+	title := target.Title
+	if title == "" {
+		title = "PicoClaw Notification"
+	}
+
+	titleBlock := adaptivecard.NewTextBlock(title, true)
+	titleBlock.Size = adaptivecard.SizeLarge
+	titleBlock.Weight = adaptivecard.WeightBolder
+	titleBlock.Style = adaptivecard.TextBlockStyleHeading
+
+	if err := card.AddElement(false, titleBlock); err != nil {
+		return card, err
+	}
+
+	content := msg.Content
+	if content == "" {
+		content = "(empty message)"
+	}
+
+	// Split content into text segments and tables
+	// TextBlocks support: bold, italic, bullet/numbered lists, links
+	// TextBlocks do NOT support: headers, tables, images
+	segments := splitContentWithTables(content)
+
+	for _, seg := range segments {
+		if seg.isTable {
+			// Convert markdown table to Adaptive Card Table element
+			tableElement, err := parseMarkdownTable(seg.content)
+			if err != nil {
+				// Fallback: render as preformatted text if parsing fails
+				logger.WarnCF("teams_webhook", "Failed to parse markdown table, using fallback", map[string]any{
+					"error": err.Error(),
+				})
+				block := adaptivecard.NewTextBlock("```\n"+seg.content+"\n```", true)
+				block.Wrap = true
+				if err := card.AddElement(false, block); err != nil {
+					return card, err
+				}
+				continue
+			}
+			if err := card.AddElement(false, tableElement); err != nil {
+				return card, err
+			}
+		} else {
+			// Regular text content
+			text := strings.TrimSpace(seg.content)
+			if text == "" {
+				continue
+			}
+			block := adaptivecard.NewTextBlock(text, true)
+			block.Wrap = true
+			if err := card.AddElement(false, block); err != nil {
+				return card, err
+			}
+		}
+	}
+
+	return card, nil
+}
+
+// contentSegment represents either a text block or a table in the message content.
+type contentSegment struct {
+	content string
+	isTable bool
+}
+
+// splitContentWithTables splits content into alternating text and table segments.
+func splitContentWithTables(content string) []contentSegment {
+	var segments []contentSegment
+
+	matches := markdownTableRe.FindAllStringSubmatchIndex(content, -1)
+	if len(matches) == 0 {
+		// No tables found, return entire content as text
+		return []contentSegment{{content: content, isTable: false}}
+	}
+
+	lastEnd := 0
+	for _, match := range matches {
+		// Text before this table
+		if match[0] > lastEnd {
+			segments = append(segments, contentSegment{
+				content: content[lastEnd:match[0]],
+				isTable: false,
+			})
+		}
+		// The table itself
+		segments = append(segments, contentSegment{
+			content: content[match[0]:match[1]],
+			isTable: true,
+		})
+		lastEnd = match[1]
+	}
+
+	// Text after the last table
+	if lastEnd < len(content) {
+		segments = append(segments, contentSegment{
+			content: content[lastEnd:],
+			isTable: false,
+		})
+	}
+
+	return segments
+}
+
+// parseMarkdownTable converts a markdown table string to an Adaptive Card Table element.
+func parseMarkdownTable(tableStr string) (adaptivecard.Element, error) {
+	lines := strings.Split(strings.TrimSpace(tableStr), "\n")
+	if len(lines) < 2 {
+		return adaptivecard.Element{}, fmt.Errorf("table must have at least header and separator rows")
+	}
+
+	// Track header content length per column for width calculation
+	var headerLengths []int
+
+	// Parse all rows (header + data rows, skip separator)
+	var allRows [][]adaptivecard.TableCell
+	for i, line := range lines {
+		// Skip separator row (contains only |, -, :, and spaces)
+		if i == 1 && isSeparatorRow(line) {
+			continue
+		}
+
+		cells := parseTableRow(line)
+		if len(cells) == 0 {
+			continue
+		}
+
+		var tableCells []adaptivecard.TableCell
+		for _, cellText := range cells {
+			trimmedText := strings.TrimSpace(cellText)
+
+			// Use header row (first row) to determine column widths
+			if i == 0 {
+				headerLengths = append(headerLengths, len(trimmedText))
+			}
+
+			textBlock := adaptivecard.Element{
+				Type: adaptivecard.TypeElementTextBlock,
+				Text: trimmedText,
+				Wrap: true,
+			}
+			cell := adaptivecard.TableCell{
+				Type:  adaptivecard.TypeTableCell,
+				Items: []*adaptivecard.Element{&textBlock},
+			}
+			tableCells = append(tableCells, cell)
+		}
+		allRows = append(allRows, tableCells)
+	}
+
+	if len(allRows) == 0 {
+		return adaptivecard.Element{}, fmt.Errorf("no valid rows found in table")
+	}
+
+	// Create table with first row as headers
+	firstRowAsHeaders := true
+	showGridLines := true
+
+	table, err := adaptivecard.NewTableFromTableCells(allRows, 0, firstRowAsHeaders, showGridLines)
+	if err != nil {
+		return adaptivecard.Element{}, fmt.Errorf("failed to create table: %w", err)
+	}
+
+	// Set column widths based on header content length
+	table.Columns = calculateColumnWidths(headerLengths)
+
+	return table, nil
+}
+
+// calculateColumnWidths creates TableColumnDefinition entries with widths
+// proportional to the max content length of each column.
+func calculateColumnWidths(maxLengths []int) []adaptivecard.Column {
+	if len(maxLengths) == 0 {
+		return nil
+	}
+
+	// Use content length as relative weight, with a minimum of 1
+	columns := make([]adaptivecard.Column, len(maxLengths))
+	for i, length := range maxLengths {
+		weight := length
+		if weight < 1 {
+			weight = 1
+		}
+		columns[i] = adaptivecard.Column{
+			Type:  "TableColumnDefinition",
+			Width: weight,
+		}
+	}
+
+	return columns
+}
+
+// isSeparatorRow checks if a line is a markdown table separator (e.g., |---|---|).
+func isSeparatorRow(line string) bool {
+	// Remove pipes and spaces, check if only dashes and colons remain
+	cleaned := strings.ReplaceAll(line, "|", "")
+	cleaned = strings.ReplaceAll(cleaned, " ", "")
+	cleaned = strings.ReplaceAll(cleaned, "-", "")
+	cleaned = strings.ReplaceAll(cleaned, ":", "")
+	return cleaned == ""
+}
+
+// parseTableRow extracts cell values from a markdown table row.
+func parseTableRow(line string) []string {
+	// Trim leading/trailing pipes and split by |
+	line = strings.TrimSpace(line)
+	line = strings.TrimPrefix(line, "|")
+	line = strings.TrimSuffix(line, "|")
+
+	if line == "" {
+		return nil
+	}
+
+	parts := strings.Split(line, "|")
+	var cells []string
+	for _, p := range parts {
+		cells = append(cells, strings.TrimSpace(p))
+	}
+	return cells
+}

pkg/channels/teams_webhook/teams_webhook_test.go

@@ -0,0 +1,583 @@
+package teamswebhook
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	goteamsnotify "github.com/atc0005/go-teams-notify/v2"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+// mockTeamsClient implements teamsMessageSender for testing.
+type mockTeamsClient struct {
+	sendFunc func(ctx context.Context, webhookURL string, message goteamsnotify.TeamsMessage) error
+}
+
+func (m *mockTeamsClient) SendWithContext(
+	ctx context.Context,
+	webhookURL string,
+	message goteamsnotify.TeamsMessage,
+) error {
+	if m.sendFunc != nil {
+		return m.sendFunc(ctx, webhookURL, message)
+	}
+	return nil
+}
+
+func TestNewTeamsWebhookChannel(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+
+	// Test missing webhooks
+	_, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled:  true,
+		Webhooks: nil,
+	}, msgBus)
+	if err == nil {
+		t.Error("expected error for missing webhooks")
+	}
+
+	// Test missing "default" webhook
+	_, err = NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"alerts": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook"),
+				Title:      "Alerts",
+			},
+		},
+	}, msgBus)
+	if err == nil {
+		t.Error("expected error for missing 'default' webhook")
+	}
+
+	// Test empty webhook URL
+	_, err = NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {Title: "Default"},
+		},
+	}, msgBus)
+	if err == nil {
+		t.Error("expected error for empty webhook_url")
+	}
+
+	// Test HTTP URL (should fail, must be HTTPS)
+	_, err = NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("http://example.com/webhook"),
+				Title:      "Default",
+			},
+		},
+	}, msgBus)
+	if err == nil {
+		t.Error("expected error for HTTP webhook URL (must be HTTPS)")
+	}
+
+	// Test valid config with HTTPS (must include "default")
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-default"),
+				Title:      "Default",
+			},
+			"alerts": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook1"),
+				Title:      "Alerts",
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if ch.Name() != "teams_webhook" {
+		t.Errorf("expected name 'teams_webhook', got %q", ch.Name())
+	}
+}
+
+func TestTeamsWebhookChannel_StartStop(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook"),
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	ctx := context.Background()
+
+	if ch.IsRunning() {
+		t.Error("channel should not be running before Start")
+	}
+
+	if err := ch.Start(ctx); err != nil {
+		t.Fatalf("Start failed: %v", err)
+	}
+
+	if !ch.IsRunning() {
+		t.Error("channel should be running after Start")
+	}
+
+	if err := ch.Stop(ctx); err != nil {
+		t.Fatalf("Stop failed: %v", err)
+	}
+
+	if ch.IsRunning() {
+		t.Error("channel should not be running after Stop")
+	}
+}
+
+func TestTeamsWebhookChannel_BuildAdaptiveCard(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-default"),
+				Title:      "Default",
+			},
+			"alerts": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook"),
+				Title:      "Custom Title",
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	target := ch.config.Webhooks["alerts"]
+	msg := bus.OutboundMessage{
+		Content: "Test message content",
+		ChatID:  "alerts",
+	}
+
+	card, err := ch.buildAdaptiveCard(msg, target)
+	if err != nil {
+		t.Fatalf("buildAdaptiveCard failed: %v", err)
+	}
+
+	if card.Type != "AdaptiveCard" {
+		t.Errorf("expected card type 'AdaptiveCard', got %q", card.Type)
+	}
+}
+
+func TestTeamsWebhookChannel_SendNotRunning(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook"),
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	ctx := context.Background()
+	msg := bus.OutboundMessage{Content: "test", ChatID: "default"}
+
+	_, err = ch.Send(ctx, msg)
+	if err == nil {
+		t.Error("expected error when sending while not running")
+	}
+}
+
+func TestTeamsWebhookChannel_SendDefaultTargetFallback(t *testing.T) {
+	tests := []struct {
+		name   string
+		chatID string
+	}{
+		{"unknown target falls back to default", "unknown"},
+		{"empty ChatID uses default", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			msgBus := bus.NewMessageBus()
+			ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+				Enabled: true,
+				Webhooks: map[string]config.TeamsWebhookTarget{
+					"default": {
+						WebhookURL: *config.NewSecureString("https://example.com/webhook-default"),
+					},
+					"alerts": {
+						WebhookURL: *config.NewSecureString("https://example.com/webhook-alerts"),
+					},
+				},
+			}, msgBus)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			var sentURL string
+			ch.client = &mockTeamsClient{
+				sendFunc: func(ctx context.Context, webhookURL string, message goteamsnotify.TeamsMessage) error {
+					sentURL = webhookURL
+					return nil
+				},
+			}
+
+			ctx := context.Background()
+			_ = ch.Start(ctx)
+			defer ch.Stop(ctx)
+
+			msg := bus.OutboundMessage{Content: "test", ChatID: tt.chatID}
+			_, err = ch.Send(ctx, msg)
+			if err != nil {
+				t.Fatalf("expected success, got error: %v", err)
+			}
+
+			if sentURL != "https://example.com/webhook-default" {
+				t.Errorf("expected default webhook URL, got %q", sentURL)
+			}
+		})
+	}
+}
+
+func TestTeamsWebhookChannel_SendSuccess(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-default"),
+				Title:      "Default",
+			},
+			"alerts": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-alerts"),
+				Title:      "Test Alerts",
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Inject mock client
+	var sentURL string
+	ch.client = &mockTeamsClient{
+		sendFunc: func(ctx context.Context, webhookURL string, message goteamsnotify.TeamsMessage) error {
+			sentURL = webhookURL
+			return nil
+		},
+	}
+
+	ctx := context.Background()
+	_ = ch.Start(ctx)
+	defer ch.Stop(ctx)
+
+	msg := bus.OutboundMessage{Content: "Hello Teams!", ChatID: "alerts"}
+
+	_, err = ch.Send(ctx, msg)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if sentURL != "https://example.com/webhook-alerts" {
+		t.Errorf("expected webhook URL 'https://example.com/webhook-alerts', got %q", sentURL)
+	}
+}
+
+func TestTeamsWebhookChannel_SendError(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+	ch, err := NewTeamsWebhookChannel(config.TeamsWebhookConfig{
+		Enabled: true,
+		Webhooks: map[string]config.TeamsWebhookTarget{
+			"default": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-default"),
+			},
+			"alerts": {
+				WebhookURL: *config.NewSecureString("https://example.com/webhook-alerts"),
+			},
+		},
+	}, msgBus)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Inject mock client that returns an error
+	ch.client = &mockTeamsClient{
+		sendFunc: func(ctx context.Context, webhookURL string, message goteamsnotify.TeamsMessage) error {
+			return errors.New("error on notification: 401 Unauthorized, forbidden")
+		},
+	}
+
+	ctx := context.Background()
+	_ = ch.Start(ctx)
+	defer ch.Stop(ctx)
+
+	msg := bus.OutboundMessage{Content: "test", ChatID: "alerts"}
+
+	_, err = ch.Send(ctx, msg)
+	if err == nil {
+		t.Error("expected error from failed send")
+	}
+}
+
+func TestSplitContentWithTables(t *testing.T) {
+	tests := []struct {
+		name     string
+		content  string
+		wantSegs int
+		wantTbl  int // number of table segments
+	}{
+		{
+			name:     "no tables",
+			content:  "Just some text\nwith multiple lines",
+			wantSegs: 1,
+			wantTbl:  0,
+		},
+		{
+			name: "single table",
+			content: `| Col1 | Col2 |
+|------|------|
+| A    | B    |
+| C    | D    |`,
+			wantSegs: 1,
+			wantTbl:  1,
+		},
+		{
+			name: "text before table",
+			content: `Here is some text.
+
+| Col1 | Col2 |
+|------|------|
+| A    | B    |`,
+			wantSegs: 2,
+			wantTbl:  1,
+		},
+		{
+			name: "text before and after table",
+			content: `Before table.
+
+| Col1 | Col2 |
+|------|------|
+| A    | B    |
+
+After table.`,
+			wantSegs: 3,
+			wantTbl:  1,
+		},
+		{
+			name: "multiple tables",
+			content: `First table:
+
+| A | B |
+|---|---|
+| 1 | 2 |
+
+Second table:
+
+| X | Y |
+|---|---|
+| 3 | 4 |`,
+			wantSegs: 4,
+			wantTbl:  2,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			segs := splitContentWithTables(tt.content)
+			if len(segs) != tt.wantSegs {
+				t.Errorf("got %d segments, want %d", len(segs), tt.wantSegs)
+			}
+			tableCount := 0
+			for _, s := range segs {
+				if s.isTable {
+					tableCount++
+				}
+			}
+			if tableCount != tt.wantTbl {
+				t.Errorf("got %d tables, want %d", tableCount, tt.wantTbl)
+			}
+		})
+	}
+}
+
+func TestParseMarkdownTable(t *testing.T) {
+	tableStr := `| Name | Value |
+|------|-------|
+| foo  | 123   |
+| bar  | 456   |`
+
+	elem, err := parseMarkdownTable(tableStr)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if elem.Type != "Table" {
+		t.Errorf("expected type 'Table', got %q", elem.Type)
+	}
+
+	// Should have 3 rows (header + 2 data rows)
+	if len(elem.Rows) != 3 {
+		t.Errorf("expected 3 rows, got %d", len(elem.Rows))
+	}
+
+	// Should have 2 columns with widths based on content length
+	if len(elem.Columns) != 2 {
+		t.Errorf("expected 2 columns, got %d", len(elem.Columns))
+	}
+}
+
+func TestParseMarkdownTableColumnWidths(t *testing.T) {
+	// Column widths are based on HEADER row only:
+	// Col1: "Description" (11 chars)
+	// Col2: "X" (1 char)
+	// Col3: "Amount" (6 chars)
+	tableStr := `| Description | X | Amount |
+|-------------|---|--------|
+| Short       | Y | 100    |
+| Longer text | Z | 50     |`
+
+	elem, err := parseMarkdownTable(tableStr)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if len(elem.Columns) != 3 {
+		t.Fatalf("expected 3 columns, got %d", len(elem.Columns))
+	}
+
+	// Verify column widths are based on header content length
+	w1, ok1 := elem.Columns[0].Width.(int)
+	w2, ok2 := elem.Columns[1].Width.(int)
+	w3, ok3 := elem.Columns[2].Width.(int)
+
+	if !ok1 || !ok2 || !ok3 {
+		t.Fatalf("expected int widths, got types: %T, %T, %T",
+			elem.Columns[0].Width, elem.Columns[1].Width, elem.Columns[2].Width)
+	}
+
+	// Header lengths: "Description" = 11, "X" = 1, "Amount" = 6
+	if w1 != 11 {
+		t.Errorf("expected col1 width 11 (from 'Description'), got %d", w1)
+	}
+	if w2 != 1 {
+		t.Errorf("expected col2 width 1 (from 'X'), got %d", w2)
+	}
+	if w3 != 6 {
+		t.Errorf("expected col3 width 6 (from 'Amount'), got %d", w3)
+	}
+}
+
+func TestCalculateColumnWidths(t *testing.T) {
+	tests := []struct {
+		name       string
+		maxLengths []int
+		wantWidths []int
+	}{
+		{
+			name:       "equal lengths",
+			maxLengths: []int{10, 10, 10},
+			wantWidths: []int{10, 10, 10},
+		},
+		{
+			name:       "varying lengths",
+			maxLengths: []int{5, 20, 10},
+			wantWidths: []int{5, 20, 10},
+		},
+		{
+			name:       "zero length gets minimum of 1",
+			maxLengths: []int{0, 5, 0},
+			wantWidths: []int{1, 5, 1},
+		},
+		{
+			name:       "empty input",
+			maxLengths: []int{},
+			wantWidths: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cols := calculateColumnWidths(tt.maxLengths)
+
+			if tt.wantWidths == nil {
+				if cols != nil {
+					t.Errorf("expected nil, got %v", cols)
+				}
+				return
+			}
+
+			if len(cols) != len(tt.wantWidths) {
+				t.Fatalf("expected %d columns, got %d", len(tt.wantWidths), len(cols))
+			}
+
+			for i, col := range cols {
+				width, ok := col.Width.(int)
+				if !ok {
+					t.Errorf("column %d: expected int width, got %T", i, col.Width)
+					continue
+				}
+				if width != tt.wantWidths[i] {
+					t.Errorf("column %d: expected width %d, got %d", i, tt.wantWidths[i], width)
+				}
+				if col.Type != "TableColumnDefinition" {
+					t.Errorf("column %d: expected type 'TableColumnDefinition', got %q", i, col.Type)
+				}
+			}
+		})
+	}
+}
+
+func TestParseTableRow(t *testing.T) {
+	tests := []struct {
+		line string
+		want []string
+	}{
+		{"| A | B | C |", []string{"A", "B", "C"}},
+		{"|A|B|C|", []string{"A", "B", "C"}},
+		{"| foo | bar |", []string{"foo", "bar"}},
+		{"", nil},
+	}
+
+	for _, tt := range tests {
+		got := parseTableRow(tt.line)
+		if len(got) != len(tt.want) {
+			t.Errorf("parseTableRow(%q): got %v, want %v", tt.line, got, tt.want)
+			continue
+		}
+		for i := range got {
+			if got[i] != tt.want[i] {
+				t.Errorf("parseTableRow(%q)[%d]: got %q, want %q", tt.line, i, got[i], tt.want[i])
+			}
+		}
+	}
+}
+
+func TestIsSeparatorRow(t *testing.T) {
+	tests := []struct {
+		line string
+		want bool
+	}{
+		{"|---|---|", true},
+		{"| --- | --- |", true},
+		{"|:---|---:|", true},
+		{"| :---: | :---: |", true},
+		{"| A | B |", false},
+		{"| foo | bar |", false},
+	}
+
+	for _, tt := range tests {
+		got := isSeparatorRow(tt.line)
+		if got != tt.want {
+			t.Errorf("isSeparatorRow(%q): got %v, want %v", tt.line, got, tt.want)
+		}
+	}
+}

pkg/config/config.go

@@ -297,6 +297,7 @@ type ChannelsConfig struct {
 	PicoClient   PicoClientConfig   `json:"pico_client"   yaml:"pico_client,omitempty"`
 	IRC          IRCConfig          `json:"irc"           yaml:"irc,omitempty"`
 	VK           VKConfig           `json:"vk"            yaml:"vk,omitempty"`
+	TeamsWebhook TeamsWebhookConfig `json:"teams_webhook" yaml:"teams_webhook,omitempty"`
 }
 
 // GroupTriggerConfig controls when the bot responds in group chats.
@@ -566,6 +567,19 @@ func (c *VKConfig) SetToken(token string) {
 	c.Token = *NewSecureString(token)
 }
 
+// TeamsWebhookConfig configures the output-only Microsoft Teams webhook channel.
+// Multiple webhook targets can be configured and selected via ChatID at send time.
+type TeamsWebhookConfig struct {
+	Enabled  bool                          `json:"enabled"  yaml:"-"                  env:"PICOCLAW_CHANNELS_TEAMS_WEBHOOK_ENABLED"`
+	Webhooks map[string]TeamsWebhookTarget `json:"webhooks" yaml:"webhooks,omitempty"`
+}
+
+// TeamsWebhookTarget represents a single Teams webhook destination.
+type TeamsWebhookTarget struct {
+	WebhookURL SecureString `json:"webhook_url,omitzero" yaml:"webhook_url,omitempty"`
+	Title      string       `json:"title,omitempty"      yaml:"-"`
+}
+
 type HeartbeatConfig struct {
 	Enabled  bool `json:"enabled"  env:"PICOCLAW_HEARTBEAT_ENABLED"`
 	Interval int  `json:"interval" env:"PICOCLAW_HEARTBEAT_INTERVAL"` // minutes, min 5

pkg/gateway/gateway.go

@@ -28,6 +28,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/channels/pico"
 	_ "github.com/sipeed/picoclaw/pkg/channels/qq"
 	_ "github.com/sipeed/picoclaw/pkg/channels/slack"
+	_ "github.com/sipeed/picoclaw/pkg/channels/teams_webhook"
 	_ "github.com/sipeed/picoclaw/pkg/channels/telegram"
 	_ "github.com/sipeed/picoclaw/pkg/channels/vk"
 	_ "github.com/sipeed/picoclaw/pkg/channels/wecom"