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Fuxux

by io.github.abogitoff
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Update post

update_post
DestructiveIdempotent

Edit a draft or scheduled post before it publishes: reschedule (scheduled posts only; scheduled_at must be in the future), change captions, or replace media. Published or publishing posts can't be edited. Provide at least one of scheduled_at, variant_updates, media_urls.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesPost id (from list_posts or create_post)
media_urlsNoReplaces the post's media (public https URLs)
scheduled_atNoNew ISO datetime in the future (scheduled posts only)
variant_updatesNoCaption changes, one entry per variant

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYes
postNoThe post after the update
successYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "id": {
+      "type": "string"
+    },
+    "post": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "created_at": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "id": {
+              "type": "string"
+            },
+            "media_urls": {
+              "anyOf": [
+                {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "post_variants": {
+              "anyOf": [
+                {
+                  "items": {
+                    "additionalProperties": {},
+                    "properties": {
+                      "connected_account_id": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "content": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Caption for this platform/account"
+                      },
+                      "error_message": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "id": {
+                        "type": "string"
+                      },
+                      "platform": {
+                        "description": "Platform id, e.g. instagram, linkedin",
+                        "type": "string"
+                      },
+                      "platform_post_id": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "published_at": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "status": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "id",
+                      "platform"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "One entry per platform/account"
+            },
+            "published_at": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "raw_prompt": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "scheduled_at": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "status": {
+              "description": "draft | scheduled | publishing | published | failed",
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "status"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "The post after the update"
+    },
+    "success": {
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "success",
+    "id"
+  ],
+  "type": "object"
+}
  2. Added

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare destructiveHint=true and idempotentHint=true; the description adds real context beyond them: media_urls REPLACES existing media, rescheduling is restricted to scheduled posts with a future timestamp, and published posts are immutable. It stops short of stating permission/auth requirements or whether prior media is recoverable.

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

Conciseness5/5

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

Two sentences, front-loaded with the scope and eligibility window, then the payload requirement. Every clause carries an actionable constraint; no filler.

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

Completeness5/5

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

An output schema exists so return values need no explanation, and annotations cover the safety profile. The description supplies the eligibility rules, per-field constraints, and the 'at least one field' precondition, which is everything an agent needs to invoke it correctly.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3, but the description adds a constraint the schema does not encode: at least one of scheduled_at, variant_updates, or media_urls must be supplied (schema only requires id). It also restates the future-timestamp rule for scheduled_at, reinforcing the field's semantics.

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

Purpose5/5

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

Specific verb+resource ('Edit a draft or scheduled post') with the three editable surfaces enumerated (reschedule, captions, media). Clearly distinguishable from siblings create_post, delete_post, and get_post.

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?

States the operative window explicitly ('draft or scheduled post before it publishes') and the exclusion ('Published or publishing posts can't be edited'), plus a minimum-payload rule. It does not name delete_post or get_post as alternatives for other states, but the when/when-not boundary is unambiguous.

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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