Add request_copilot_review tool with placeholder implementation

Author: aryasoni98

README.md

@@ -458,6 +458,13 @@ export GITHUB_MCP_TOOL_ADD_ISSUE_COMMENT_DESCRIPTION="an alternative description
   - `base`: New base branch name (string, optional)
   - `maintainer_can_modify`: Allow maintainer edits (boolean, optional)
 
+- **request_copilot_review** - Request a GitHub Copilot review for a pull request (experimental; subject to GitHub API support)
+
+  - `owner`: Repository owner (string, required)
+  - `repo`: Repository name (string, required)
+  - `pull_number`: Pull request number (number, required)
+  - _Note: As of now, requesting a Copilot review programmatically is not supported by the GitHub API. This tool will return an error until GitHub exposes this functionality._
+
 ### Repositories
 
 - **create_or_update_file** - Create or update a single file in a repository

pkg/github/pullrequests.go

@@ -1729,3 +1729,40 @@ func newGQLStringlike[T ~string](s string) *T {
 	stringlike := T(s)
 	return &stringlike
 }
+
+// RequestCopilotReview creates a tool to request a Copilot review for a pull request.
+func RequestCopilotReview(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
+	return mcp.NewTool("request_copilot_review",
+			mcp.WithDescription(t("TOOL_REQUEST_COPILOT_REVIEW_DESCRIPTION", "Request a GitHub Copilot review for a pull request. Note: This feature depends on GitHub API support and may not be available for all users.")),
+			mcp.WithString("owner",
+				mcp.Required(),
+				mcp.Description("Repository owner"),
+			),
+			mcp.WithString("repo",
+				mcp.Required(),
+				mcp.Description("Repository name"),
+			),
+			mcp.WithNumber("pull_number",
+				mcp.Required(),
+				mcp.Description("Pull request number"),
+			),
+		),
+		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
+			}
+			pullNumber, err := RequiredInt(request, "pull_number")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+
+			// As of now, GitHub API does not support Copilot as a reviewer programmatically.
+			// This is a placeholder for future support.
+			return mcp.NewToolResultError(fmt.Sprintf("Requesting a Copilot review for PR #%d in %s/%s is not currently supported by the GitHub API. Please request a Copilot review via the GitHub UI.", pullNumber, owner, repo)), nil
+		}
+}

pkg/github/pullrequests_test.go

@@ -1545,3 +1545,27 @@ func Test_AddPullRequestReviewComment(t *testing.T) {
 		})
 	}
 }
+
+func Test_RequestCopilotReview(t *testing.T) {
+	mockClient := github.NewClient(nil)
+	tool, handler := RequestCopilotReview(stubGetClientFn(mockClient), translations.NullTranslationHelper)
+
+	assert.Equal(t, "request_copilot_review", 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, "pull_number")
+	assert.ElementsMatch(t, tool.InputSchema.Required, []string{"owner", "repo", "pull_number"})
+
+	request := createMCPRequest(map[string]interface{}{
+		"owner":       "owner",
+		"repo":        "repo",
+		"pull_number": float64(42),
+	})
+
+	result, err := handler(context.Background(), request)
+	assert.NoError(t, err)
+	assert.NotNil(t, result)
+	textContent := getTextResult(t, result)
+	assert.Contains(t, textContent.Text, "not currently supported by the GitHub API")
+}