Updated from Slack docs, 2025/12/08

Author: Slack API Ref Buildbot

docs.slack.dev/methods/chat.postMessage.json

@@ -103,7 +103,7 @@
         "example": "**This is bold text**"
       },
       "metadata": {
-        "desc": "JSON object with event_type and event_payload fields, presented as a URL-encoded string. Metadata you post to Slack is accessible to any app or user who is a member of that workspace.",
+        "desc": "JSON object with event_type and event_payload fields, presented as a URL-encoded string. You can also provide Work Object entity metadata using this parameter. Metadata you post to Slack is accessible to any app or user who is a member of that workspace.",
         "example": "{\"event_type\": \"task_created\", \"event_payload\": { \"id\": \"11223\", \"title\": \"Redesign Homepage\"}}",
         "anyOf": [
           {

docs.slack.dev/methods/chat.unfurl.json

@@ -84,7 +84,7 @@
         ]
       },
       "metadata": {
-        "desc": "JSON object with `entity_type` and `entity_payload` fields, presented as a URL-encoded string. Either `unfurls` or `metadata` must be provided.",
+        "desc": "JSON object with an entities field providing an array of Work Object entities. Either unfurls or metadata must be provided.",
         "anyOf": [
           {
             "type": "string"

methods/chat/chat.postMessage.json

@@ -65,7 +65,7 @@
     "metadata": {
       "required": false,
       "example": "{\"event_type\": \"task_created\", \"event_payload\": { \"id\": \"11223\", \"title\": \"Redesign Homepage\"}}",
-      "desc": "JSON object with event_type and event_payload fields, presented as a URL-encoded string. Metadata you post to Slack is accessible to any app or user who is a member of that workspace.",
+      "desc": "JSON object with event_type and event_payload fields, presented as a URL-encoded string. You can also provide Work Object entity metadata using this parameter. Metadata you post to Slack is accessible to any app or user who is a member of that workspace.",
       "type": "string",
       "format": "json"
     },

methods/chat/chat.unfurl.json

@@ -56,7 +56,7 @@
     },
     "metadata": {
       "required": false,
-      "desc": "JSON object with entity_type and entity_payload fields, presented as a URL-encoded string. Either unfurls or metadata must be provided.",
+      "desc": "JSON object with an entities field providing an array of Work Object entities. Either unfurls or metadata must be provided.",
       "type": "string",
       "format": "json"
     }