Added value: +{
+  "description": "Set to \"HTML\" to send the text (or caption) as Telegram HTML. Omit for plain text.",
+  "enum": [
+    "HTML"
+  ],
+  "type": "string"
+}

Previous value: -"Message body. Required unless media is passed; with media it becomes the caption (max 1024 characters) and may be omitted. `{{var|name}}` placeholders resolve against the recipient's variable context."New value: +"Message body. Required unless media is passed; with media it becomes the caption (max 1024 characters) and may be omitted. `{{var|name}}` placeholders resolve against the recipient's variable context. Plain text unless parseMode is \"HTML\"."

Previous value: -"Up to 8 URL buttons, rendered one per row under the message. Rejected together with media."New value: +"Up to 8 buttons, rendered one per row under the message. Each needs exactly one of url or flowId; the two kinds may be mixed. Rejected together with media."

Added value: +{
+  "description": "Id of an already-applied INTERACTIVE flow to run for the recipient when they tap the button (from apply_actions' idRemap or get_application_context). Broadcast and operation flows are rejected. Set this OR url, never both.",
+  "type": "string"
+}

Previous value: -"Required. Where the button leads — http(s) or tg:// only. There is no callback/flow-wired button here; use send_flow_to_contacts for those."New value: +"Where the button leads — http(s) or tg:// only. Set this OR flowId, never both."

Previous value: -[
-  "text",
-  "url"
-]New value: +[
+  "text"
+]

Added value: +{
+  "description": "Up to 8 URL buttons, rendered one per row under the message. Rejected together with media.",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "text": {
+        "description": "Required. Label shown on the button.",
+        "type": "string"
+      },
+      "url": {
+        "description": "Required. Where the button leads — http(s) or tg:// only. There is no callback/flow-wired button here; use send_flow_to_contacts for those.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "text",
+      "url"
+    ],
+    "type": "object"
+  },
+  "maxItems": 8,
+  "type": "array"
+}

Added value: +{
+  "description": "Up to 10 attachments. Several items send as one album with `text` as the shared caption.",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "filename": {
+        "description": "Filename shown for DOCUMENT sends. Defaults to the URL's basename.",
+        "type": "string"
+      },
+      "type": {
+        "description": "Attachment kind. Inferred from the URL's file extension when omitted; unrecognized extensions fall back to DOCUMENT.",
+        "enum": [
+          "IMAGE",
+          "IMAGE_URL",
+          "VIDEO",
+          "VIDEO_NOTE",
+          "DOCUMENT",
+          "VOICE",
+          "STICKER"
+        ],
+        "type": "string"
+      },
+      "url": {
+        "description": "Required. Publicly reachable http(s) URL of the file; the platform downloads it from there.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "url"
+    ],
+    "type": "object"
+  },
+  "maxItems": 10,
+  "type": "array"
+}

Previous value: -"Required. Plain-text message body, must be non-empty. `{{var|name}}` placeholders resolve against the recipient's variable context."New value: +"Message body. Required unless media is passed; with media it becomes the caption (max 1024 characters) and may be omitted. `{{var|name}}` placeholders resolve against the recipient's variable context."

Removed value: -1

Removed value: -[
-  "text"
-]

Added value: +"Application (workspace) id. Optional: an application-scoped key (app_...) defaults to its own application, but a personal key (usr_...) has no default and omitting it fails with MCP_APPLICATION_REQUIRED. Call list_applications to get the id."

Added value: +"Bot to send from. Required in practice when targeting by platformId in a multi-bot application; without it the call succeeds only if exactly one contact matches, and otherwise fails listing the candidate bots."

Added value: +"Preferred way to target the recipient: the globally unique FlowCastle contact id. Supply either this or platformId."

Added value: +"Platform-side user id (e.g. the Telegram user id). NOT globally unique — unique only per bot — so pass botId alongside it when the application has more than one bot."

Added value: +"Required. Plain-text message body, must be non-empty. `{{var|name}}` placeholders resolve against the recipient's variable context."