diff --git a/agents/build/dynamic-variables.mdx b/agents/build/dynamic-variables.mdx
index ee88d3d..a7e773c 100644
--- a/agents/build/dynamic-variables.mdx
+++ b/agents/build/dynamic-variables.mdx
@@ -132,7 +132,8 @@ Custom variables also render inside [webhook tool](/agents/build/webhook-tools#a
 https://ehr.example.com/patients/{{patient_id}}/appointments?clinic={{clinic_id}}
 ```
 
-- In the URL the value is URL-encoded, like argument values. In header values and the body template it is inserted as is. Numbers render as written, booleans as `true` or `false`.
+- In the URL the value is URL-encoded, like argument values. In header values it is inserted as is. Numbers render as written, booleans as `true` or `false`.
+- In a JSON body, a value inside a string is JSON-escaped, like argument values. See [Values in a JSON body](/agents/build/webhook-tools#values-in-a-json-body).
 - When the tool declares an argument with the same name as a custom variable, the argument wins: that placeholder is filled from what the agent supplies.
 - A placeholder with no value renders as an empty string in the request, unlike in the prompt, where it stays visible.
 
diff --git a/agents/build/webhook-tools.mdx b/agents/build/webhook-tools.mdx
index 51ef9a6..5608171 100644
--- a/agents/build/webhook-tools.mdx
+++ b/agents/build/webhook-tools.mdx
@@ -51,6 +51,30 @@ https://api.example.com/orders/{{order_number}}
 }
 ```
 
+### Values in a JSON body
+
+When the body is JSON, what happens to a value depends on where its placeholder sits:
+
+- **Inside a JSON string**, like `"note": "{{note}}"`: the value is JSON-escaped. Quotes, backslashes, and line breaks in it can't break the body.
+- **Outside a string**, like `"count": {{count}}`: the value is inserted as is. Use this to send a number, a boolean, or a whole object.
+
+```json Body template
+{
+  "note": "{{note}}",
+  "count": {{count}}
+}
+```
+
+If the agent passes `She said "call me back"` as `note`, the request body contains `"note": "She said \"call me back\""`.
+
+The same rule covers arguments, dynamic variables, and requests from the **Test** tab.
+
+The body counts as JSON when its content type is `application/json` (the default) or a `+json` type such as `application/vnd.api+json`. A `Content-Type` header on the tool takes priority over the content type setting. Bodies of any other content type are filled in as is.
+
+<Note>
+A placeholder outside a string is not checked. If its value isn't valid JSON in that spot, the body isn't either. Put text values in quotes.
+</Note>
+
 ## Authentication headers
 
 Each header has a kind that identifies what it carries:
diff --git a/api-reference/openapi.json b/api-reference/openapi.json
index 5905b01..aefd15b 100644
--- a/api-reference/openapi.json
+++ b/api-reference/openapi.json
@@ -66,6 +66,19 @@
                       "title": "Finished At",
                       "type": "string"
                     },
+                    "anchor_day": {
+                      "anyOf": [
+                        {
+                          "type": "integer"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ],
+                      "default": null,
+                      "description": "UTC day of month used for credit refreshes; clamp to the month's last day. Missing/null falls back to updated_at's UTC day.",
+                      "title": "Anchor Day"
+                    },
                     "stripe_subscription_id": {
                       "anyOf": [
                         {
@@ -24699,6 +24712,11 @@
             ],
             "default": null,
             "title": "Channel"
+          },
+          "world_context": {
+            "default": false,
+            "title": "World Context",
+            "type": "boolean"
           }
         },
         "required": [