feat: initial release with 48 Mattermost MCP tools

- 27 base tools: channels, messaging, users, reactions, files, DMs
- Team management: invite/remove users, get stats, list members
- Slash commands: execute /remind, /poll, etc.
- Webhook management: incoming and outgoing webhooks
- System tools: server config, logs, bulk status updates
- Channel admin: create, invite, leave, delete channels
- Read-only mode for safe exploration
- Dual token support (bot + PAT) for enhanced security
- Apache 2.0 licensed

operation/reaction/reaction_test.go

@@ -0,0 +1,78 @@
+package reaction
+
+import (
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSlimReaction(t *testing.T) {
+	tests := []struct {
+		name     string
+		reaction *model.Reaction
+		expected map[string]interface{}
+	}{
+		{
+			name: "valid reaction",
+			reaction: &model.Reaction{
+				UserId:    "user123",
+				PostId:    "post456",
+				EmojiName: "thumbsup",
+				CreateAt:  1234567890,
+			},
+			expected: map[string]interface{}{
+				"user_id":    "user123",
+				"post_id":    "post456",
+				"emoji_name": "thumbsup",
+				"create_at":  int64(1234567890),
+			},
+		},
+		{
+			name:     "nil reaction",
+			reaction: nil,
+			expected: nil,
+		},
+		{
+			name: "reaction with different emoji",
+			reaction: &model.Reaction{
+				UserId:    "user789",
+				PostId:    "post012",
+				EmojiName: "rocket",
+				CreateAt:  9876543210,
+			},
+			expected: map[string]interface{}{
+				"user_id":    "user789",
+				"post_id":    "post012",
+				"emoji_name": "rocket",
+				"create_at":  int64(9876543210),
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := SlimReaction(tt.reaction)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func TestToolConstants(t *testing.T) {
+	assert.Equal(t, "mattermost_add_reaction", AddReactionToolName)
+	assert.Equal(t, "mattermost_remove_reaction", RemoveReactionToolName)
+}
+
+func TestToolRegistration(t *testing.T) {
+	// Verify tools are registered
+	tools := Tool.Tools()
+	assert.Len(t, tools, 2)
+
+	toolNames := make([]string, len(tools))
+	for i, t := range tools {
+		toolNames[i] = t.Tool.Name
+	}
+
+	assert.Contains(t, toolNames, AddReactionToolName)
+	assert.Contains(t, toolNames, RemoveReactionToolName)
+}