Add reaction tools for issues and pull requests

README.md

@@ -846,6 +846,20 @@ The following sets of tools are available:
   - `owner`: Repository owner (string, required)
   - `repo`: Repository name (string, required)
 
+- **add_issue_comment_reaction** - Add Issue Comment Reaction
+  - **Required OAuth Scopes**: `repo`
+  - `comment_id`: The issue comment ID (number, required)
+  - `content`: The emoji reaction type (string, required)
+  - `owner`: Repository owner (username or organization) (string, required)
+  - `repo`: Repository name (string, required)
+
+- **add_issue_reaction** - Add Issue Reaction
+  - **Required OAuth Scopes**: `repo`
+  - `content`: The emoji reaction type (string, required)
+  - `issue_number`: The issue number (number, required)
+  - `owner`: Repository owner (username or organization) (string, required)
+  - `repo`: Repository name (string, required)
+
 - **get_label** - Get a specific label from a repository
   - **Required OAuth Scopes**: `repo`
   - `name`: Label name. (string, required)
@@ -1095,6 +1109,13 @@ The following sets of tools are available:
   - `startSide`: For multi-line comments, the starting side of the diff that the comment applies to. LEFT indicates the previous state, RIGHT indicates the new state (string, optional)
   - `subjectType`: The level at which the comment is targeted (string, required)
 
+- **add_pull_request_review_comment_reaction** - Add Pull Request Review Comment Reaction
+  - **Required OAuth Scopes**: `repo`
+  - `comment_id`: The pull request review comment ID (number, required)
+  - `content`: The emoji reaction type (string, required)
+  - `owner`: Repository owner (username or organization) (string, required)
+  - `repo`: Repository name (string, required)
+
 - **add_reply_to_pull_request_comment** - Add reply to pull request comment
   - **Required OAuth Scopes**: `repo`
   - `body`: The text of the reply (string, required)

pkg/github/__toolsnaps__/add_issue_comment_reaction.snap

@@ -0,0 +1,47 @@
+{
+  "annotations": {
+    "destructiveHint": false,
+    "openWorldHint": true,
+    "title": "Add Issue Comment Reaction"
+  },
+  "description": "Add a reaction to an issue comment.",
+  "inputSchema": {
+    "properties": {
+      "comment_id": {
+        "description": "The issue comment ID",
+        "minimum": 1,
+        "type": "number"
+      },
+      "content": {
+        "description": "The emoji reaction type",
+        "enum": [
+          "+1",
+          "-1",
+          "laugh",
+          "confused",
+          "heart",
+          "hooray",
+          "rocket",
+          "eyes"
+        ],
+        "type": "string"
+      },
+      "owner": {
+        "description": "Repository owner (username or organization)",
+        "type": "string"
+      },
+      "repo": {
+        "description": "Repository name",
+        "type": "string"
+      }
+    },
+    "required": [
+      "owner",
+      "repo",
+      "comment_id",
+      "content"
+    ],
+    "type": "object"
+  },
+  "name": "add_issue_comment_reaction"
+}

pkg/github/__toolsnaps__/add_issue_reaction.snap

@@ -0,0 +1,47 @@
+{
+  "annotations": {
+    "destructiveHint": false,
+    "openWorldHint": true,
+    "title": "Add Issue Reaction"
+  },
+  "description": "Add a reaction to an issue.",
+  "inputSchema": {
+    "properties": {
+      "content": {
+        "description": "The emoji reaction type",
+        "enum": [
+          "+1",
+          "-1",
+          "laugh",
+          "confused",
+          "heart",
+          "hooray",
+          "rocket",
+          "eyes"
+        ],
+        "type": "string"
+      },
+      "issue_number": {
+        "description": "The issue number",
+        "minimum": 1,
+        "type": "number"
+      },
+      "owner": {
+        "description": "Repository owner (username or organization)",
+        "type": "string"
+      },
+      "repo": {
+        "description": "Repository name",
+        "type": "string"
+      }
+    },
+    "required": [
+      "owner",
+      "repo",
+      "issue_number",
+      "content"
+    ],
+    "type": "object"
+  },
+  "name": "add_issue_reaction"
+}

pkg/github/__toolsnaps__/add_pull_request_review_comment_reaction.snap

@@ -0,0 +1,47 @@
+{
+  "annotations": {
+    "destructiveHint": false,
+    "openWorldHint": true,
+    "title": "Add Pull Request Review Comment Reaction"
+  },
+  "description": "Add a reaction to a pull request review comment.",
+  "inputSchema": {
+    "properties": {
+      "comment_id": {
+        "description": "The pull request review comment ID",
+        "minimum": 1,
+        "type": "number"
+      },
+      "content": {
+        "description": "The emoji reaction type",
+        "enum": [
+          "+1",
+          "-1",
+          "laugh",
+          "confused",
+          "heart",
+          "hooray",
+          "rocket",
+          "eyes"
+        ],
+        "type": "string"
+      },
+      "owner": {
+        "description": "Repository owner (username or organization)",
+        "type": "string"
+      },
+      "repo": {
+        "description": "Repository name",
+        "type": "string"
+      }
+    },
+    "required": [
+      "owner",
+      "repo",
+      "comment_id",
+      "content"
+    ],
+    "type": "object"
+  },
+  "name": "add_pull_request_review_comment_reaction"
+}

pkg/github/granular_tools_test.go

@@ -43,6 +43,8 @@ func TestGranularToolSnaps(t *testing.T) {
 		GranularRemoveSubIssue,
 		GranularReprioritizeSubIssue,
 		GranularSetIssueFields,
+		AddIssueReaction,
+		AddIssueCommentReaction,
 		GranularUpdatePullRequestTitle,
 		GranularUpdatePullRequestBody,
 		GranularUpdatePullRequestState,
@@ -54,6 +56,7 @@ func TestGranularToolSnaps(t *testing.T) {
 		GranularAddPullRequestReviewComment,
 		GranularResolveReviewThread,
 		GranularUnresolveReviewThread,
+		AddPullRequestReviewCommentReaction,
 	}
 
 	for _, constructor := range toolConstructors {
@@ -2025,3 +2028,180 @@ func TestGranularSetIssueFields(t *testing.T) {
 		assert.Equal(t, "update_issue_suggestions", spy.captured.Get(headers.GraphQLFeaturesHeader))
 	})
 }
+
+// --- Reaction granular tool handler tests ---
+
+func TestAddIssueReaction(t *testing.T) {
+	mockReaction := &gogithub.Reaction{
+		ID:      gogithub.Ptr(int64(12345)),
+		Content: gogithub.Ptr("+1"),
+	}
+
+	tests := []struct {
+		name         string
+		mockedClient *http.Client
+		args         map[string]any
+		expectErr    bool
+	}{
+		{
+			name: "add reaction to issue successfully",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				PostReposIssuesReactionsByOwnerByRepoByIssueNumber: mockResponse(t, http.StatusCreated, mockReaction),
+			}),
+			args: map[string]any{
+				"owner":        "owner",
+				"repo":         "repo",
+				"issue_number": float64(42),
+				"content":      "+1",
+			},
+			expectErr: false,
+		},
+		{
+			name:         "missing owner returns error",
+			mockedClient: MockHTTPClientWithHandlers(nil),
+			args: map[string]any{
+				"repo":         "repo",
+				"issue_number": float64(42),
+				"content":      "+1",
+			},
+			expectErr: true,
+		},
+		{
+			name:         "missing content returns error",
+			mockedClient: MockHTTPClientWithHandlers(nil),
+			args: map[string]any{
+				"owner":        "owner",
+				"repo":         "repo",
+				"issue_number": float64(42),
+			},
+			expectErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client := mustNewGHClient(t, tc.mockedClient)
+			deps := BaseDeps{Client: client}
+			serverTool := AddIssueReaction(translations.NullTranslationHelper)
+			handler := serverTool.Handler(deps)
+			request := createMCPRequest(tc.args)
+			result, err := handler(ContextWithDeps(context.Background(), deps), &request)
+			require.NoError(t, err)
+			if tc.expectErr {
+				assert.True(t, result.IsError)
+			} else {
+				assert.False(t, result.IsError)
+			}
+		})
+	}
+}
+
+func TestAddIssueCommentReaction(t *testing.T) {
+	mockReaction := &gogithub.Reaction{
+		ID:      gogithub.Ptr(int64(67890)),
+		Content: gogithub.Ptr("heart"),
+	}
+
+	tests := []struct {
+		name         string
+		mockedClient *http.Client
+		args         map[string]any
+		expectErr    bool
+	}{
+		{
+			name: "add reaction to issue comment successfully",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				PostReposIssuesCommentsReactionsByOwnerByRepoByCommentID: mockResponse(t, http.StatusCreated, mockReaction),
+			}),
+			args: map[string]any{
+				"owner":      "owner",
+				"repo":       "repo",
+				"comment_id": float64(999),
+				"content":    "heart",
+			},
+			expectErr: false,
+		},
+		{
+			name:         "missing comment_id returns error",
+			mockedClient: MockHTTPClientWithHandlers(nil),
+			args: map[string]any{
+				"owner":   "owner",
+				"repo":    "repo",
+				"content": "heart",
+			},
+			expectErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client := mustNewGHClient(t, tc.mockedClient)
+			deps := BaseDeps{Client: client}
+			serverTool := AddIssueCommentReaction(translations.NullTranslationHelper)
+			handler := serverTool.Handler(deps)
+			request := createMCPRequest(tc.args)
+			result, err := handler(ContextWithDeps(context.Background(), deps), &request)
+			require.NoError(t, err)
+			if tc.expectErr {
+				assert.True(t, result.IsError)
+			} else {
+				assert.False(t, result.IsError)
+			}
+		})
+	}
+}
+
+func TestAddPullRequestReviewCommentReaction(t *testing.T) {
+	mockReaction := &gogithub.Reaction{
+		ID:      gogithub.Ptr(int64(54321)),
+		Content: gogithub.Ptr("rocket"),
+	}
+
+	tests := []struct {
+		name         string
+		mockedClient *http.Client
+		args         map[string]any
+		expectErr    bool
+	}{
+		{
+			name: "add reaction to PR review comment successfully",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				PostReposPullsCommentsReactionsByOwnerByRepoByCommentID: mockResponse(t, http.StatusCreated, mockReaction),
+			}),
+			args: map[string]any{
+				"owner":      "owner",
+				"repo":       "repo",
+				"comment_id": float64(888),
+				"content":    "rocket",
+			},
+			expectErr: false,
+		},
+		{
+			name:         "missing repo returns error",
+			mockedClient: MockHTTPClientWithHandlers(nil),
+			args: map[string]any{
+				"owner":      "owner",
+				"comment_id": float64(888),
+				"content":    "rocket",
+			},
+			expectErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client := mustNewGHClient(t, tc.mockedClient)
+			deps := BaseDeps{Client: client}
+			serverTool := AddPullRequestReviewCommentReaction(translations.NullTranslationHelper)
+			handler := serverTool.Handler(deps)
+			request := createMCPRequest(tc.args)
+			result, err := handler(ContextWithDeps(context.Background(), deps), &request)
+			require.NoError(t, err)
+			if tc.expectErr {
+				assert.True(t, result.IsError)
+			} else {
+				assert.False(t, result.IsError)
+			}
+		})
+	}
+}