diff --git a/descriptions-next/api.github.com/api.github.com.2022-11-28.json b/descriptions-next/api.github.com/api.github.com.2022-11-28.json
index ab010b7fad..626b8831d5 100644
--- a/descriptions-next/api.github.com/api.github.com.2022-11-28.json
+++ b/descriptions-next/api.github.com/api.github.com.2022-11-28.json
@@ -66229,6 +66229,9 @@
           },
           {
             "$ref": "#/components/parameters/page"
+          },
+          {
+            "$ref": "#/components/parameters/issue-timeline-exclude"
           }
         ],
         "responses": {
@@ -348278,6 +348281,14 @@
           "type": "integer"
         }
       },
+      "issue-timeline-exclude": {
+        "name": "exclude",
+        "in": "query",
+        "description": "A comma-separated list of timeline event names to exclude from the response.",
+        "schema": {
+          "type": "string"
+        }
+      },
       "key-id": {
         "name": "key_id",
         "description": "The unique identifier of the key.",
diff --git a/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml b/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
index adef4353d6..c2b67fb15c 100644
--- a/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
+++ b/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
@@ -48695,6 +48695,7 @@ paths:
       - "$ref": "#/components/parameters/issue-number"
       - "$ref": "#/components/parameters/per-page"
       - "$ref": "#/components/parameters/page"
+      - "$ref": "#/components/parameters/issue-timeline-exclude"
       responses:
         '200':
           description: Response
@@ -260683,6 +260684,13 @@ components:
       required: true
       schema:
         type: integer
+    issue-timeline-exclude:
+      name: exclude
+      in: query
+      description: A comma-separated list of timeline event names to exclude from
+        the response.
+      schema:
+        type: string
     key-id:
       name: key_id
       description: The unique identifier of the key.
diff --git a/descriptions-next/api.github.com/api.github.com.2026-03-10.json b/descriptions-next/api.github.com/api.github.com.2026-03-10.json
index c737f7e211..b12be81c39 100644
--- a/descriptions-next/api.github.com/api.github.com.2026-03-10.json
+++ b/descriptions-next/api.github.com/api.github.com.2026-03-10.json
@@ -66140,6 +66140,9 @@
           },
           {
             "$ref": "#/components/parameters/page"
+          },
+          {
+            "$ref": "#/components/parameters/issue-timeline-exclude"
           }
         ],
         "responses": {
@@ -347321,6 +347324,14 @@
           "type": "integer"
         }
       },
+      "issue-timeline-exclude": {
+        "name": "exclude",
+        "in": "query",
+        "description": "A comma-separated list of timeline event names to exclude from the response.",
+        "schema": {
+          "type": "string"
+        }
+      },
       "key-id": {
         "name": "key_id",
         "description": "The unique identifier of the key.",
diff --git a/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml b/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
index d8eab721ff..5559575828 100644
--- a/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
+++ b/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
@@ -48620,6 +48620,7 @@ paths:
       - "$ref": "#/components/parameters/issue-number"
       - "$ref": "#/components/parameters/per-page"
       - "$ref": "#/components/parameters/page"
+      - "$ref": "#/components/parameters/issue-timeline-exclude"
       responses:
         '200':
           description: Response
@@ -259878,6 +259879,13 @@ components:
       required: true
       schema:
         type: integer
+    issue-timeline-exclude:
+      name: exclude
+      in: query
+      description: A comma-separated list of timeline event names to exclude from
+        the response.
+      schema:
+        type: string
     key-id:
       name: key_id
       description: The unique identifier of the key.
diff --git a/descriptions-next/api.github.com/api.github.com.json b/descriptions-next/api.github.com/api.github.com.json
index a1f8c1364a..54bad76b3b 100644
--- a/descriptions-next/api.github.com/api.github.com.json
+++ b/descriptions-next/api.github.com/api.github.com.json
@@ -66536,6 +66536,9 @@
           },
           {
             "$ref": "#/components/parameters/page"
+          },
+          {
+            "$ref": "#/components/parameters/issue-timeline-exclude"
           }
         ],
         "responses": {
@@ -350420,6 +350423,14 @@
           "type": "integer"
         }
       },
+      "issue-timeline-exclude": {
+        "name": "exclude",
+        "in": "query",
+        "description": "A comma-separated list of timeline event names to exclude from the response.",
+        "schema": {
+          "type": "string"
+        }
+      },
       "key-id": {
         "name": "key_id",
         "description": "The unique identifier of the key.",
diff --git a/descriptions-next/api.github.com/api.github.com.yaml b/descriptions-next/api.github.com/api.github.com.yaml
index 75da32df07..0f47f80ad6 100644
--- a/descriptions-next/api.github.com/api.github.com.yaml
+++ b/descriptions-next/api.github.com/api.github.com.yaml
@@ -48883,6 +48883,7 @@ paths:
       - "$ref": "#/components/parameters/issue-number"
       - "$ref": "#/components/parameters/per-page"
       - "$ref": "#/components/parameters/page"
+      - "$ref": "#/components/parameters/issue-timeline-exclude"
       responses:
         '200':
           description: Response
@@ -262036,6 +262037,13 @@ components:
       required: true
       schema:
         type: integer
+    issue-timeline-exclude:
+      name: exclude
+      in: query
+      description: A comma-separated list of timeline event names to exclude from
+        the response.
+      schema:
+        type: string
     key-id:
       name: key_id
       description: The unique identifier of the key.
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
index 3b356c491c..ff57dbc77d 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
@@ -573266,6 +573266,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
index 2ee038110a..627cb75358 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
@@ -94560,6 +94560,12 @@ paths:
       - *546
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
index f65db81de6..ec93859e86 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
@@ -561285,6 +561285,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.yaml b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.yaml
index 1b6697d3d5..d0486c2db2 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.yaml
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.yaml
@@ -94059,6 +94059,12 @@ paths:
       - *546
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.deref.json b/descriptions-next/api.github.com/dereferenced/api.github.com.deref.json
index 5097c8d1f3..3fa61fd970 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.deref.json
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.deref.json
@@ -585560,6 +585560,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.deref.yaml b/descriptions-next/api.github.com/dereferenced/api.github.com.deref.yaml
index 1e54ee76f5..1e576b61a6 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.deref.yaml
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.deref.yaml
@@ -95278,6 +95278,12 @@ paths:
       - *546
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.json b/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.json
index 03fa05dd8d..6d7414d502 100644
--- a/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.json
+++ b/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.json
@@ -83996,7 +83996,7 @@
                           },
                           "ai_credit_pool_enabled": {
                             "type": "boolean",
-                            "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                            "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                           },
                           "ai_credit_pool_state": {
                             "type": "object",
@@ -84287,7 +84287,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -84631,7 +84631,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -84884,7 +84884,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -84959,7 +84959,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -642845,6 +642845,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.yaml b/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.yaml
index 97ea04899f..9a6691e7ef 100644
--- a/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.yaml
+++ b/descriptions-next/ghec/dereferenced/ghec.2022-11-28.deref.yaml
@@ -29962,8 +29962,13 @@ paths:
                             subscriptions.
                         ai_credit_pool_enabled:
                           type: boolean
-                          description: Whether the cost center draws from the AI credit
-                            pool (capped from member license entitlements).
+                          description: |-
+                            Whether the cost center draws from the AI credit pool.
+
+                            This can only be enabled for cost centers that contain only user or team resources.
+
+                            - `false` — no cap; the cost center draws from the shared enterprise pool.
+                            - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                         ai_credit_pool_state:
                           type: object
                           description: Read-only cap-budget projection for the cost
@@ -30067,8 +30072,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               example-1:
                 summary: Example request to create a cost center
@@ -30266,8 +30274,13 @@ paths:
                       pagination. Only present when pagination is used.
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -30353,8 +30366,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               update-cost-center:
                 summary: Update cost center name example
@@ -30407,8 +30423,13 @@ paths:
                       - name
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -109982,6 +110003,12 @@ paths:
       - *687
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.json b/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.json
index 86b27e2079..ee970c415b 100644
--- a/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.json
+++ b/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.json
@@ -83835,7 +83835,7 @@
                           },
                           "ai_credit_pool_enabled": {
                             "type": "boolean",
-                            "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                            "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                           },
                           "ai_credit_pool_state": {
                             "type": "object",
@@ -84126,7 +84126,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -84470,7 +84470,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -84723,7 +84723,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -84798,7 +84798,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -630565,6 +630565,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.yaml b/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.yaml
index cd250884a6..285ff652e8 100644
--- a/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.yaml
+++ b/descriptions-next/ghec/dereferenced/ghec.2026-03-10.deref.yaml
@@ -29887,8 +29887,13 @@ paths:
                             subscriptions.
                         ai_credit_pool_enabled:
                           type: boolean
-                          description: Whether the cost center draws from the AI credit
-                            pool (capped from member license entitlements).
+                          description: |-
+                            Whether the cost center draws from the AI credit pool.
+
+                            This can only be enabled for cost centers that contain only user or team resources.
+
+                            - `false` — no cap; the cost center draws from the shared enterprise pool.
+                            - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                         ai_credit_pool_state:
                           type: object
                           description: Read-only cap-budget projection for the cost
@@ -29992,8 +29997,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               example-1:
                 summary: Example request to create a cost center
@@ -30191,8 +30199,13 @@ paths:
                       pagination. Only present when pagination is used.
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -30278,8 +30291,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               update-cost-center:
                 summary: Update cost center name example
@@ -30332,8 +30348,13 @@ paths:
                       - name
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -109469,6 +109490,12 @@ paths:
       - *687
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/ghec/dereferenced/ghec.deref.json b/descriptions-next/ghec/dereferenced/ghec.deref.json
index a4d93179e8..94503da808 100644
--- a/descriptions-next/ghec/dereferenced/ghec.deref.json
+++ b/descriptions-next/ghec/dereferenced/ghec.deref.json
@@ -84468,7 +84468,7 @@
                           },
                           "ai_credit_pool_enabled": {
                             "type": "boolean",
-                            "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                            "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                           },
                           "ai_credit_pool_state": {
                             "type": "object",
@@ -84759,7 +84759,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -85103,7 +85103,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -85356,7 +85356,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                   }
                 }
               },
@@ -85431,7 +85431,7 @@
                     },
                     "ai_credit_pool_enabled": {
                       "type": "boolean",
-                      "description": "Whether the cost center draws from the AI credit pool (capped from member license entitlements)."
+                      "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements."
                     },
                     "ai_credit_pool_state": {
                       "type": "object",
@@ -655387,6 +655387,14 @@
               "type": "integer",
               "default": 1
             }
+          },
+          {
+            "name": "exclude",
+            "in": "query",
+            "description": "A comma-separated list of timeline event names to exclude from the response.",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {
diff --git a/descriptions-next/ghec/dereferenced/ghec.deref.yaml b/descriptions-next/ghec/dereferenced/ghec.deref.yaml
index 26a1698e47..9afcf9c291 100644
--- a/descriptions-next/ghec/dereferenced/ghec.deref.yaml
+++ b/descriptions-next/ghec/dereferenced/ghec.deref.yaml
@@ -30135,8 +30135,13 @@ paths:
                             subscriptions.
                         ai_credit_pool_enabled:
                           type: boolean
-                          description: Whether the cost center draws from the AI credit
-                            pool (capped from member license entitlements).
+                          description: |-
+                            Whether the cost center draws from the AI credit pool.
+
+                            This can only be enabled for cost centers that contain only user or team resources.
+
+                            - `false` — no cap; the cost center draws from the shared enterprise pool.
+                            - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                         ai_credit_pool_state:
                           type: object
                           description: Read-only cap-budget projection for the cost
@@ -30240,8 +30245,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               example-1:
                 summary: Example request to create a cost center
@@ -30439,8 +30447,13 @@ paths:
                       pagination. Only present when pagination is used.
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -30526,8 +30539,11 @@ paths:
                   type: boolean
                   description: |-
                     Whether the cost center draws from the AI credit pool.
+
+                    This can only be enabled for cost centers that contain only user or team resources.
+
                     - `false` — no cap; the cost center draws from the shared enterprise pool.
-                    - `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed.
+                    - `true` — the cost center is capped at an amount derived from its members' license entitlements.
             examples:
               update-cost-center:
                 summary: Update cost center name example
@@ -30580,8 +30596,13 @@ paths:
                       - name
                   ai_credit_pool_enabled:
                     type: boolean
-                    description: Whether the cost center draws from the AI credit
-                      pool (capped from member license entitlements).
+                    description: |-
+                      Whether the cost center draws from the AI credit pool.
+
+                      This can only be enabled for cost centers that contain only user or team resources.
+
+                      - `false` — no cap; the cost center draws from the shared enterprise pool.
+                      - `true` — the cost center is capped at an amount derived from its members' license entitlements.
                   ai_credit_pool_state:
                     type: object
                     description: Read-only cap-budget projection for the cost center.
@@ -110713,6 +110734,12 @@ paths:
       - *687
       - *17
       - *19
+      - name: exclude
+        in: query
+        description: A comma-separated list of timeline event names to exclude from
+          the response.
+        schema:
+          type: string
       responses:
         '200':
           description: Response
diff --git a/descriptions-next/ghec/ghec.2022-11-28.json b/descriptions-next/ghec/ghec.2022-11-28.json
index 0993697269..08bc68bb9b 100644
--- a/descriptions-next/ghec/ghec.2022-11-28.json
+++ b/descriptions-next/ghec/ghec.2022-11-28.json
@@ -19221,7 +19221,7 @@
                   },
                   "ai_credit_pool_enabled": {
                     "type": "boolean",
-                    "description": "Whether the cost center draws from the AI credit pool.\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount derived from its members' license entitlements. Only User and Team resources are allowed."
+                    "description": "Whether the cost center draws from the AI credit pool.\n\nThis can only be enabled for cost centers that contain only user or team resources.\n\n- `false` — no cap; the cost center draws from the shared enterprise pool.\n- `true` — the cost center is capped at an amount de{"code":"deadline_exceeded","msg":"operation timed out"}