diff --git a/lib/redirects/static/client-side-rest-api-redirects.json b/lib/redirects/static/client-side-rest-api-redirects.json
index 0c4b142766..49fa8be4f8 100644
--- a/lib/redirects/static/client-side-rest-api-redirects.json
+++ b/lib/redirects/static/client-side-rest-api-redirects.json
@@ -556,6 +556,7 @@
   "/rest/codespaces#list-devcontainers-in-a-repository-for-the-authenticated-user": "/rest/codespaces/codespaces#list-devcontainers-in-a-repository-for-the-authenticated-user",
   "/rest/codespaces#list-available-machine-types-for-a-repository": "/rest/codespaces/machines#list-available-machine-types-for-a-repository",
   "/rest/codespaces#machines": "/rest/codespaces/machines",
+  "/rest/codespaces#preview-attributes-for-a-new-codespace": "/rest/codespaces/codespaces#preview-attributes-for-a-new-codespace",
   "/rest/codespaces#list-repository-secrets": "/rest/codespaces/repository-secrets#list-repository-secrets",
   "/rest/codespaces#repository-secrets": "/rest/codespaces/repository-secrets",
   "/rest/codespaces#get-a-repository-public-key": "/rest/codespaces/repository-secrets#get-a-repository-public-key",
diff --git a/lib/rest/static/apps/enabled-for-apps.json b/lib/rest/static/apps/enabled-for-apps.json
index 8dd11aeb69..89d7676079 100644
--- a/lib/rest/static/apps/enabled-for-apps.json
+++ b/lib/rest/static/apps/enabled-for-apps.json
@@ -1211,6 +1211,12 @@
         "verb": "get",
         "requestPath": "/repos/{owner}/{repo}/codespaces/machines"
       },
+      {
+        "slug": "get-default-attributes-for-a-codespace",
+        "subcategory": "codespaces",
+        "verb": "get",
+        "requestPath": "/repos/{owner}/{repo}/codespaces/new"
+      },
       {
         "slug": "list-repository-secrets",
         "subcategory": "repository-secrets",
diff --git a/lib/rest/static/decorated/api.github.com.json b/lib/rest/static/decorated/api.github.com.json
index 3318d406a8..f103ae192d 100644
--- a/lib/rest/static/decorated/api.github.com.json
+++ b/lib/rest/static/decorated/api.github.com.json
@@ -189390,6 +189390,296 @@
         ],
         "subcategory": "codespaces"
       },
+      {
+        "serverUrl": "https://api.github.com",
+        "verb": "get",
+        "requestPath": "/repos/{owner}/{repo}/codespaces/new",
+        "title": "Get default attributes for a codespace",
+        "category": "codespaces",
+        "parameters": [
+          {
+            "name": "owner",
+            "description": "<p>The account owner of the repository. The name is not case sensitive.</p>",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "name": "repo",
+            "description": "<p>The name of the repository. The name is not case sensitive.</p>",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "name": "ref",
+            "description": "<p>The branch or commit to check for a default devcontainer path. If not specified, the default branch will be checked.</p>",
+            "in": "query",
+            "schema": {
+              "type": "string",
+              "examples": [
+                "main"
+              ]
+            }
+          },
+          {
+            "name": "client_ip",
+            "description": "<p>An alternative IP for default location auto-detection, such as when proxying a request.</p>",
+            "in": "query",
+            "schema": {
+              "type": "string",
+              "examples": [
+                "1.2.3.4"
+              ]
+            }
+          }
+        ],
+        "bodyParameters": [],
+        "enabledForGitHubApps": true,
+        "codeExamples": [
+          {
+            "key": "default",
+            "request": {
+              "description": "Example",
+              "acceptHeader": "application/vnd.github.v3+json",
+              "parameters": {
+                "owner": "OWNER",
+                "repo": "REPO"
+              }
+            },
+            "response": {
+              "statusCode": "200",
+              "contentType": "application/json",
+              "description": "<p>Response when a user is able to create codespaces from the repository.</p>",
+              "example": {
+                "devcontainers": [
+                  {
+                    "path": ".devcontainer/foobar/devcontainer.json",
+                    "name": "foobar"
+                  },
+                  {
+                    "path": ".devcontainer/devcontainer.json",
+                    "name": "kitchensink"
+                  },
+                  {
+                    "path": ".devcontainer.json"
+                  }
+                ],
+                "total_count": 3
+              },
+              "schema": {
+                "type": "object",
+                "properties": {
+                  "billable_owner": {
+                    "title": "Simple User",
+                    "description": "Simple User",
+                    "type": "object",
+                    "properties": {
+                      "name": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "email": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "login": {
+                        "type": "string",
+                        "examples": [
+                          "octocat"
+                        ]
+                      },
+                      "id": {
+                        "type": "integer",
+                        "examples": [
+                          1
+                        ]
+                      },
+                      "node_id": {
+                        "type": "string",
+                        "examples": [
+                          "MDQ6VXNlcjE="
+                        ]
+                      },
+                      "avatar_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://github.com/images/error/octocat_happy.gif"
+                        ]
+                      },
+                      "gravatar_id": {
+                        "type": [
+                          "string",
+                          "null"
+                        ],
+                        "examples": [
+                          "41d064eb2195891e12d0413f63227ea7"
+                        ]
+                      },
+                      "url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat"
+                        ]
+                      },
+                      "html_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://github.com/octocat"
+                        ]
+                      },
+                      "followers_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat/followers"
+                        ]
+                      },
+                      "following_url": {
+                        "type": "string",
+                        "examples": [
+                          "https://api.github.com/users/octocat/following{/other_user}"
+                        ]
+                      },
+                      "gists_url": {
+                        "type": "string",
+                        "examples": [
+                          "https://api.github.com/users/octocat/gists{/gist_id}"
+                        ]
+                      },
+                      "starred_url": {
+                        "type": "string",
+                        "examples": [
+                          "https://api.github.com/users/octocat/starred{/owner}{/repo}"
+                        ]
+                      },
+                      "subscriptions_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat/subscriptions"
+                        ]
+                      },
+                      "organizations_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat/orgs"
+                        ]
+                      },
+                      "repos_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat/repos"
+                        ]
+                      },
+                      "events_url": {
+                        "type": "string",
+                        "examples": [
+                          "https://api.github.com/users/octocat/events{/privacy}"
+                        ]
+                      },
+                      "received_events_url": {
+                        "type": "string",
+                        "format": "uri",
+                        "examples": [
+                          "https://api.github.com/users/octocat/received_events"
+                        ]
+                      },
+                      "type": {
+                        "type": "string",
+                        "examples": [
+                          "User"
+                        ]
+                      },
+                      "site_admin": {
+                        "type": "boolean"
+                      },
+                      "starred_at": {
+                        "type": "string",
+                        "examples": [
+                          "\"2020-07-09T00:17:55Z\""
+                        ]
+                      }
+                    },
+                    "required": [
+                      "avatar_url",
+                      "events_url",
+                      "followers_url",
+                      "following_url",
+                      "gists_url",
+                      "gravatar_id",
+                      "html_url",
+                      "id",
+                      "node_id",
+                      "login",
+                      "organizations_url",
+                      "received_events_url",
+                      "repos_url",
+                      "site_admin",
+                      "starred_url",
+                      "subscriptions_url",
+                      "type",
+                      "url"
+                    ]
+                  },
+                  "defaults": {
+                    "type": "object",
+                    "required": [
+                      "location",
+                      "devcontainer_path"
+                    ],
+                    "properties": {
+                      "location": {
+                        "type": "string"
+                      },
+                      "devcontainer_path": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        ],
+        "previews": [],
+        "descriptionHTML": "<p>Gets the default attributes for codespaces created by the user with the repository.</p>\n<p>You must authenticate using an access token with the <code>codespace</code> scope to use this endpoint.</p>\n<p>GitHub Apps must have write access to the <code>codespaces</code> repository permission to use this endpoint.</p>",
+        "statusCodes": [
+          {
+            "httpStatusCode": "200",
+            "description": "<p>Response when a user is able to create codespaces from the repository.</p>"
+          },
+          {
+            "httpStatusCode": "401",
+            "description": "<p>Requires authentication</p>"
+          },
+          {
+            "httpStatusCode": "403",
+            "description": "<p>Forbidden</p>"
+          },
+          {
+            "httpStatusCode": "404",
+            "description": "<p>Resource not found</p>"
+          }
+        ],
+        "subcategory": "codespaces"
+      },
       {
         "serverUrl": "https://api.github.com",
         "verb": "post",
@@ -258413,7 +258703,7 @@
         "enabledForGitHubApps": true,
         "codeExamples": [
           {
-            "key": "201",
+            "key": "default",
             "request": {
               "contentType": "application/json",
               "description": "Example 1: Status Code 201",
@@ -258430,7 +258720,16 @@
             },
             "response": {
               "statusCode": "201",
-              "description": "<p>Response when creating a secret</p>"
+              "contentType": "application/json",
+              "description": "<p>Response when creating a secret</p>",
+              "example": null,
+              "schema": {
+                "title": "Empty Object",
+                "description": "An object without any properties.",
+                "type": "object",
+                "properties": {},
+                "additionalProperties": false
+              }
             }
           },
           {
@@ -483822,7 +484121,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",
@@ -490181,7 +490482,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",
@@ -515957,7 +516260,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",
diff --git a/lib/rest/static/decorated/ghes-3.4.json b/lib/rest/static/decorated/ghes-3.4.json
index c7412daf16..808f613f4a 100644
--- a/lib/rest/static/decorated/ghes-3.4.json
+++ b/lib/rest/static/decorated/ghes-3.4.json
@@ -195286,7 +195286,7 @@
         "enabledForGitHubApps": true,
         "codeExamples": [
           {
-            "key": "201",
+            "key": "default",
             "request": {
               "contentType": "application/json",
               "description": "Example 1: Status Code 201",
@@ -195303,7 +195303,16 @@
             },
             "response": {
               "statusCode": "201",
-              "description": "<p>Response when creating a secret</p>"
+              "contentType": "application/json",
+              "description": "<p>Response when creating a secret</p>",
+              "example": null,
+              "schema": {
+                "title": "Empty Object",
+                "description": "An object without any properties.",
+                "type": "object",
+                "properties": {},
+                "additionalProperties": false
+              }
             }
           },
           {
diff --git a/lib/rest/static/decorated/ghes-3.5.json b/lib/rest/static/decorated/ghes-3.5.json
index c2565bbd67..3092754d83 100644
--- a/lib/rest/static/decorated/ghes-3.5.json
+++ b/lib/rest/static/decorated/ghes-3.5.json
@@ -205277,7 +205277,7 @@
         "enabledForGitHubApps": true,
         "codeExamples": [
           {
-            "key": "201",
+            "key": "default",
             "request": {
               "contentType": "application/json",
               "description": "Example 1: Status Code 201",
@@ -205294,7 +205294,16 @@
             },
             "response": {
               "statusCode": "201",
-              "description": "<p>Response when creating a secret</p>"
+              "contentType": "application/json",
+              "description": "<p>Response when creating a secret</p>",
+              "example": null,
+              "schema": {
+                "title": "Empty Object",
+                "description": "An object without any properties.",
+                "type": "object",
+                "properties": {},
+                "additionalProperties": false
+              }
             }
           },
           {
diff --git a/lib/rest/static/decorated/github.ae.json b/lib/rest/static/decorated/github.ae.json
index b8d850ead5..d1a89aec89 100644
--- a/lib/rest/static/decorated/github.ae.json
+++ b/lib/rest/static/decorated/github.ae.json
@@ -353046,7 +353046,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",
@@ -359381,7 +359383,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",
@@ -382531,7 +382535,9 @@
                   },
                   "use_squash_pr_title_as_default": {
                     "type": "boolean",
-                    "default": false
+                    "examples": [
+                      false
+                    ]
                   },
                   "allow_forking": {
                     "type": "boolean",