feat: add pagination support to get_pull_request_files tool

- Add WithPagination() to tool definition
- Use OptionalPaginationParams to handle page and perPage parameters
- Pass pagination parameters to GitHub API ListFiles call
- Update tests to include pagination scenarios
- Update tool schema snapshot

Fixes #527

Author: Anant rustagi

pkg/github/__toolsnaps__/get_pull_request_files.snap

@@ -10,6 +10,17 @@
         "description": "Repository owner",
         "type": "string"
       },
+      "page": {
+        "description": "Page number for pagination (min 1)",
+        "minimum": 1,
+        "type": "number"
+      },
+      "perPage": {
+        "description": "Results per page for pagination (min 1, max 100)",
+        "maximum": 100,
+        "minimum": 1,
+        "type": "number"
+      },
       "pullNumber": {
         "description": "Pull request number",
         "type": "number"

pkg/github/pullrequests.go

@@ -532,6 +532,7 @@ func GetPullRequestFiles(getClient GetClientFn, t translations.TranslationHelper
 				mcp.Required(),
 				mcp.Description("Pull request number"),
 			),
+			WithPagination(),
 		),
 		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 			owner, err := RequiredParam[string](request, "owner")
@@ -546,12 +547,19 @@ func GetPullRequestFiles(getClient GetClientFn, t translations.TranslationHelper
 			if err != nil {
 				return mcp.NewToolResultError(err.Error()), nil
 			}
+			pagination, err := OptionalPaginationParams(request)
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
 
 			client, err := getClient(ctx)
 			if err != nil {
 				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
 			}
-			opts := &github.ListOptions{}
+			opts := &github.ListOptions{
+				PerPage: pagination.perPage,
+				Page:    pagination.page,
+			}
 			files, resp, err := client.PullRequests.ListFiles(ctx, owner, repo, pullNumber, opts)
 			if err != nil {
 				return nil, fmt.Errorf("failed to get pull request files: %w", err)

pkg/github/pullrequests_test.go

@@ -568,6 +568,8 @@ func Test_GetPullRequestFiles(t *testing.T) {
 	assert.Contains(t, tool.InputSchema.Properties, "owner")
 	assert.Contains(t, tool.InputSchema.Properties, "repo")
 	assert.Contains(t, tool.InputSchema.Properties, "pullNumber")
+	assert.Contains(t, tool.InputSchema.Properties, "page")
+	assert.Contains(t, tool.InputSchema.Properties, "perPage")
 	assert.ElementsMatch(t, tool.InputSchema.Required, []string{"owner", "repo", "pullNumber"})
 
 	// Setup mock PR files for success case
@@ -614,6 +616,24 @@ func Test_GetPullRequestFiles(t *testing.T) {
 			expectError:   false,
 			expectedFiles: mockFiles,
 		},
+		{
+			name: "successful files fetch with pagination",
+			mockedClient: mock.NewMockedHTTPClient(
+				mock.WithRequestMatch(
+					mock.GetReposPullsFilesByOwnerByRepoByPullNumber,
+					mockFiles,
+				),
+			),
+			requestArgs: map[string]interface{}{
+				"owner":      "owner",
+				"repo":       "repo",
+				"pullNumber": float64(42),
+				"page":       float64(2),
+				"perPage":    float64(10),
+			},
+			expectError:   false,
+			expectedFiles: mockFiles,
+		},
 		{
 			name: "files fetch fails",
 			mockedClient: mock.NewMockedHTTPClient(