feat: add UpdateIssueComment tool to edit issue comments

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ashwin-ant

pkg/github/issues.go

@@ -142,6 +142,76 @@ func AddIssueComment(getClient GetClientFn, t translations.TranslationHelperFunc
 		}
 }
 
+// UpdateIssueComment creates a tool to update a comment on an issue.
+func UpdateIssueComment(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
+	return mcp.NewTool("update_issue_comment",
+			mcp.WithDescription(t("TOOL_UPDATE_ISSUE_COMMENT_DESCRIPTION", "Update a comment on an issue")),
+			mcp.WithString("owner",
+				mcp.Required(),
+				mcp.Description("Repository owner"),
+			),
+			mcp.WithString("repo",
+				mcp.Required(),
+				mcp.Description("Repository name"),
+			),
+			mcp.WithNumber("commentId",
+				mcp.Required(),
+				mcp.Description("Comment ID to update"),
+			),
+			mcp.WithString("body",
+				mcp.Required(),
+				mcp.Description("The new text for the comment"),
+			),
+		),
+		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+			owner, err := requiredParam[string](request, "owner")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			repo, err := requiredParam[string](request, "repo")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			commentID, err := RequiredInt(request, "commentId")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			body, err := requiredParam[string](request, "body")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+
+			comment := &github.IssueComment{
+				Body: github.Ptr(body),
+			}
+
+			client, err := getClient(ctx)
+			if err != nil {
+				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
+			}
+			updatedComment, resp, err := client.Issues.EditComment(ctx, owner, repo, int64(commentID), comment)
+			if err != nil {
+				return nil, fmt.Errorf("failed to update issue comment: %w", err)
+			}
+			defer func() { _ = resp.Body.Close() }()
+
+			if resp.StatusCode != http.StatusOK {
+				body, err := io.ReadAll(resp.Body)
+				if err != nil {
+					return nil, fmt.Errorf("failed to read response body: %w", err)
+				}
+				return mcp.NewToolResultError(fmt.Sprintf("failed to update issue comment: %s", string(body))), nil
+			}
+
+			r, err := json.Marshal(updatedComment)
+			if err != nil {
+				return nil, fmt.Errorf("failed to marshal response: %w", err)
+			}
+
+			return mcp.NewToolResultText(string(r)), nil
+		}
+}
+
 // SearchIssues creates a tool to search for issues and pull requests.
 func SearchIssues(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
 	return mcp.NewTool("search_issues",

pkg/github/issues_test.go

@@ -1130,3 +1130,139 @@ func Test_GetIssueComments(t *testing.T) {
 		})
 	}
 }
+
+func Test_UpdateIssueComment(t *testing.T) {
+	// Verify tool definition once
+	mockClient := github.NewClient(nil)
+	tool, _ := UpdateIssueComment(stubGetClientFn(mockClient), translations.NullTranslationHelper)
+
+	assert.Equal(t, "update_issue_comment", tool.Name)
+	assert.NotEmpty(t, tool.Description)
+	assert.Contains(t, tool.InputSchema.Properties, "owner")
+	assert.Contains(t, tool.InputSchema.Properties, "repo")
+	assert.Contains(t, tool.InputSchema.Properties, "commentId")
+	assert.Contains(t, tool.InputSchema.Properties, "body")
+	assert.ElementsMatch(t, tool.InputSchema.Required, []string{"owner", "repo", "commentId", "body"})
+
+	// Setup mock comment for success case
+	mockUpdatedComment := &github.IssueComment{
+		ID:        github.Ptr(int64(123)),
+		Body:      github.Ptr("Updated issue comment text here"),
+		HTMLURL:   github.Ptr("https://github.com/owner/repo/issues/1#issuecomment-123"),
+		CreatedAt: &github.Timestamp{Time: time.Now().Add(-1 * time.Hour)},
+		UpdatedAt: &github.Timestamp{Time: time.Now()},
+		User: &github.User{
+			Login: github.Ptr("testuser"),
+		},
+	}
+
+	tests := []struct {
+		name            string
+		mockedClient    *http.Client
+		requestArgs     map[string]interface{}
+		expectError     bool
+		expectedComment *github.IssueComment
+		expectedErrMsg  string
+	}{
+		{
+			name: "successful comment update",
+			mockedClient: mock.NewMockedHTTPClient(
+				mock.WithRequestMatchHandler(
+					mock.PatchReposIssuesCommentsByOwnerByRepoByCommentId,
+					expectRequestBody(t, map[string]interface{}{
+						"body": "Updated issue comment text here",
+					}).andThen(
+						mockResponse(t, http.StatusOK, mockUpdatedComment),
+					),
+				),
+			),
+			requestArgs: map[string]interface{}{
+				"owner":     "owner",
+				"repo":      "repo",
+				"commentId": float64(123),
+				"body":      "Updated issue comment text here",
+			},
+			expectError:     false,
+			expectedComment: mockUpdatedComment,
+		},
+		{
+			name: "comment update fails - not found",
+			mockedClient: mock.NewMockedHTTPClient(
+				mock.WithRequestMatchHandler(
+					mock.PatchReposIssuesCommentsByOwnerByRepoByCommentId,
+					http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+						w.WriteHeader(http.StatusNotFound)
+						w.Header().Set("Content-Type", "application/json")
+						_, _ = w.Write([]byte(`{"message": "Comment not found"}`))
+					}),
+				),
+			),
+			requestArgs: map[string]interface{}{
+				"owner":     "owner",
+				"repo":      "repo",
+				"commentId": float64(999),
+				"body":      "This should fail",
+			},
+			expectError:    true,
+			expectedErrMsg: "failed to update issue comment",
+		},
+		{
+			name: "comment update fails - validation error",
+			mockedClient: mock.NewMockedHTTPClient(
+				mock.WithRequestMatchHandler(
+					mock.PatchReposIssuesCommentsByOwnerByRepoByCommentId,
+					http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+						w.WriteHeader(http.StatusUnprocessableEntity)
+						w.Header().Set("Content-Type", "application/json")
+						_, _ = w.Write([]byte(`{"message": "Validation Failed"}`))
+					}),
+				),
+			),
+			requestArgs: map[string]interface{}{
+				"owner":     "owner",
+				"repo":      "repo",
+				"commentId": float64(123),
+				"body":      "Invalid body",
+			},
+			expectError:    true,
+			expectedErrMsg: "failed to update issue comment",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client := github.NewClient(tc.mockedClient)
+			_, handler := UpdateIssueComment(stubGetClientFn(client), translations.NullTranslationHelper)
+
+			request := createMCPRequest(tc.requestArgs)
+
+			result, err := handler(context.Background(), request)
+
+			if tc.expectError {
+				require.Error(t, err)
+				assert.Contains(t, err.Error(), tc.expectedErrMsg)
+				return
+			}
+
+			require.NoError(t, err)
+			assert.NotNil(t, result)
+			require.Len(t, result.Content, 1)
+
+			textContent := getTextResult(t, result)
+
+			// For non-error cases, check the returned comment
+			var returnedComment github.IssueComment
+			err = json.Unmarshal([]byte(textContent.Text), &returnedComment)
+			require.NoError(t, err)
+
+			assert.Equal(t, *tc.expectedComment.ID, *returnedComment.ID)
+			assert.Equal(t, *tc.expectedComment.Body, *returnedComment.Body)
+			if tc.expectedComment.HTMLURL != nil {
+				assert.Equal(t, *tc.expectedComment.HTMLURL, *returnedComment.HTMLURL)
+			}
+			if tc.expectedComment.User != nil && tc.expectedComment.User.Login != nil {
+				assert.Equal(t, *tc.expectedComment.User.Login, *returnedComment.User.Login)
+			}
+		})
+	}
+}

pkg/github/tools.go

@@ -46,6 +46,7 @@ func InitToolsets(passedToolsets []string, readOnly bool, getClient GetClientFn,
 			toolsets.NewServerTool(CreateIssue(getClient, t)),
 			toolsets.NewServerTool(AddIssueComment(getClient, t)),
 			toolsets.NewServerTool(UpdateIssue(getClient, t)),
+			toolsets.NewServerTool(UpdateIssueComment(getClient, t)),
 		)
 	users := toolsets.NewToolset("users", "GitHub User related tools").
 		AddReadTools(