Fuxux

Create post

create_post

Destructive

Create a post: per-platform captions, optional prompt, optional scheduled_at (ISO, future), optional media_urls (strings). Without scheduled_at or draft, this publishes immediately to the connected social platforms. Set draft: true to save it for the user to review in Fuxux instead; nothing is published.

Input Schema

TableJSON Schema

Name	Required	Description
`draft`	No	Save as a draft instead of publishing or scheduling (can't be combined with scheduled_at)
`prompt`	No	Optional note on the idea behind the post (max 500 chars). Stored with the post for reference; it is not published.
`targets`	No	Which accounts to post to. Without it, each captioned platform posts to its first connected account. Reddit is not available here: Reddit posts are created in the Fuxux web app only.
`captions`	Yes	Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, discord, kick, twitch
`media_urls`	No	Up to 4 public https image/video URLs to attach
`scheduled_at`	No	ISO datetime; if set, post is scheduled instead of published immediately

Output Schema

TableJSON Schema

Name	Required	Description	Default
`post`	Yes	The created post
`results`	No	Per-platform outcome; present only when published immediately

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 3, 2026

changedInput schema / properties / captions / description

Previous value: -"Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, google-business, discord, kick, twitch"New value: +"Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, discord, kick, twitch"

changedInput schema / properties / targets / items / properties / platform / enum

Previous value: -[
-  "twitter",
-  "instagram",
-  "linkedin",
-  "facebook",
-  "tiktok",
-  "youtube",
-  "bluesky",
-  "threads",
-  "pinterest",
-  "google-business",
-  "discord",
-  "kick",
-  "twitch"
-]New value: +[
+  "twitter",
+  "instagram",
+  "linkedin",
+  "facebook",
+  "tiktok",
+  "youtube",
+  "bluesky",
+  "threads",
+  "pinterest",
+  "discord",
+  "kick",
+  "twitch"
+]

Changed5 schema fields changedOct 2, 2026

changedInput schema / properties / captions / description

Previous value: -"Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, google-business, reddit, discord, kick, twitch"New value: +"Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, google-business, discord, kick, twitch"

changedInput schema / properties / targets / description

Previous value: -"Which accounts to post to. Without it, each captioned platform posts to its first connected account. Required for reddit (subreddit)."New value: +"Which accounts to post to. Without it, each captioned platform posts to its first connected account. Reddit is not available here: Reddit posts are created in the Fuxux web app only."

removedInput schema / properties / targets / items / properties / flair_id

Removed value: -{
-  "description": "reddit only: post flair id, if the subreddit requires one",
-  "type": "string"
-}

changedInput schema / properties / targets / items / properties / platform / enum

Previous value: -[
-  "twitter",
-  "instagram",
-  "linkedin",
-  "facebook",
-  "tiktok",
-  "youtube",
-  "bluesky",
-  "threads",
-  "pinterest",
-  "google-business",
-  "reddit",
-  "discord",
-  "kick",
-  "twitch"
-]New value: +[
+  "twitter",
+  "instagram",
+  "linkedin",
+  "facebook",
+  "tiktok",
+  "youtube",
+  "bluesky",
+  "threads",
+  "pinterest",
+  "google-business",
+  "discord",
+  "kick",
+  "twitch"
+]

removedInput schema / properties / targets / items / properties / subreddit

Removed value: -{
-  "description": "reddit only: subreddit name without r/ (required for reddit)",
-  "type": "string"
-}

Changed1 schema field changedOct 2, 2026

addedInput schema / properties / targets / items / properties / board_id

Added value: +{
+  "description": "pinterest only: board id to pin to; defaults to the account's first public board",
+  "type": "string"
+}

Changed2 schema fields changedSep 30, 2026

changedInput schema / properties / captions / description

Previous value: -"Map of platform id to caption text"New value: +"Map of platform id to caption text. Platform ids: twitter, instagram, linkedin, facebook, tiktok, youtube, bluesky, threads, pinterest, google-business, reddit, discord, kick, twitch"

addedInput schema / properties / targets

Added value: +{
+  "description": "Which accounts to post to. Without it, each captioned platform posts to its first connected account. Required for reddit (subreddit).",
+  "items": {
+    "properties": {
+      "account_id": {
+        "description": "Connected account id from list_connected_accounts",
+        "format": "uuid",
+        "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+        "type": "string"
+      },
+      "flair_id": {
+        "description": "reddit only: post flair id, if the subreddit requires one",
+        "type": "string"
+      },
+      "format": {
+        "description": "instagram and facebook only; defaults to feed",
+        "enum": [
+          "feed",
+          "story"
+        ],
+        "type": "string"
+      },
+      "platform": {
+        "description": "That account's platform; needs a caption in captions",
+        "enum": [
+          "twitter",
+          "instagram",
+          "linkedin",
+          "facebook",
+          "tiktok",
+          "youtube",
+          "bluesky",
+          "threads",
+          "pinterest",
+          "google-business",
+          "reddit",
+          "discord",
+          "kick",
+          "twitch"
+        ],
+        "type": "string"
+      },
+      "subreddit": {
+        "description": "reddit only: subreddit name without r/ (required for reddit)",
+        "type": "string"
+      }
+    },
+    "required": [
+      "account_id",
+      "platform"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Changed1 schema field changedSep 30, 2026

addedInput schema / properties / draft

Added value: +{
+  "description": "Save as a draft instead of publishing or scheduling (can't be combined with scheduled_at)",
+  "type": "boolean"
+}

Changed3 schema fields changedSep 29, 2026

addedInput schema / properties / media_urls / description

Added value: +"Up to 4 public https image/video URLs to attach"

addedInput schema / properties / prompt / description

Added value: +"Optional note on the idea behind the post (max 500 chars). Stored with the post for reference; it is not published."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "post": {
+      "additionalProperties": {},
+      "description": "The created post",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "scheduled_at": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "status": {
+          "description": "draft | scheduled | published | failed",
+          "type": "string"
+        }
+      },
+      "required": [
+        "id",
+        "status"
+      ],
+      "type": "object"
+    },
+    "results": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "properties": {
+              "account_id": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "account_label": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "error": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "inbox_pending": {
+                "anyOf": [
+                  {
+                    "type": "boolean"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "platform": {
+                "type": "string"
+              },
+              "platform_post_id": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "still_processing": {
+                "anyOf": [
+                  {
+                    "type": "boolean"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "success": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "platform",
+              "success"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Per-platform outcome; present only when published immediately"
+    }
+  },
+  "required": [
+    "post"
+  ],
+  "type": "object"
+}

First observedSep 29, 2026

TDQS

A3.9/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With annotations already declaring destructiveHint=true and openWorldHint=true, the description adds genuinely useful context: this call publishes to live connected social platforms unless scheduled_at or draft is set, and draft:true publishes nothing. It stops short of covering reversibility, auth requirements, or partial-failure behavior across multiple platforms.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three sentences, front-loaded with the tool's parameter surface before the behavior contract, and nothing is wasted. There is mild redundancy between the parenthetical parameter list and the schema, and "(ISO, future)" partly duplicates the schema's ISO datetime wording.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Output schema exists, so return values need no explanation, and annotations carry the safety profile. The description covers the three execution modes completely; only peripheral details (targets/Reddit restriction) are left to the schema, which handles them adequately.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents every parameter including the draft/scheduled_at exclusivity and the targets fallback. The description's parameter mentions (ISO, future, strings) mostly restate what the schema provides, adding no syntax or constraint detail beyond it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb+resource ("Create a post") plus an enumeration of what it accepts (captions, prompt, scheduled_at, media_urls). It is clearly distinguishable from get_post/update_post/delete_post by virtue of the create verb, but it never names or contrasts with those siblings explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives clear mode-selection guidance: no scheduled_at/draft means immediate publish, scheduled_at means schedule, draft:true means save for review. This tells the agent when each behavior applies, though it does not compare against alternatives like update_post or the web-app-only path for Reddit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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