Refactor tool rejection plan example to use model.tools configuration

Co-authored-by: sahil <[email protected]>

Author: cursoragent

fern/tools/tool-rejection-plan.mdx

@@ -112,42 +112,38 @@ Wired into a rejection plan:
 }
 ```
 
-## Using it in assistant hooks
+## Normal tool call example
 
-Attach `rejectionPlan` to any tool call inside a hook:
+Attach `rejectionPlan` directly on a tool in your assistant configuration (`model.tools`):
 
 ```json
 {
-  "hooks": [
-    {
-      "on": "call.ending",
-      "do": [
-        {
-          "type": "tool",
-          "tool": {
-            "type": "endCall",
-            "rejectionPlan": {
-              "conditions": [
-                {
-                  "type": "regex",
-                  "regex": "(?i)\\b(bye|goodbye|farewell|see you later|take care)\\b",
-                  "target": { "position": -1, "role": "user" },
-                  "negate": true
-                }
-              ]
+  "model": {
+    "provider": "openai",
+    "model": "gpt-4o",
+    "messages": [
+      { "role": "system", "content": "Only end the call after the user says goodbye." }
+    ],
+    "tools": [
+      {
+        "type": "endCall",
+        "rejectionPlan": {
+          "conditions": [
+            {
+              "type": "regex",
+              "regex": "(?i)\\b(bye|goodbye|farewell|see you later|take care)\\b",
+              "target": { "position": -1, "role": "user" },
+              "negate": true
             }
-          }
+          ]
         }
-      ]
-    }
-  ]
+      }
+    ]
+  }
 }
 ```
-
 ## Tips
 
 - Escape backslashes in regex patterns: write `\\b` in JSON to mean `\b` in the regex engine.
 - `position: -1` targets the most recent message. Omit `role` to target regardless of role.
-- Prefer a `group` with `operator: "OR"` for disjunctive logic at the top level.
-
-See also: [Swagger](https://api.vapi.ai/api), [OpenAPI JSON](https://api.vapi.ai/api-json).
+- Prefer a `group` with `operator: "OR"` for disjunctive logic at the top level.