PrismPoster Creator Tools MCP

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TypeScript

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List social media placement specs

list_social_media_placements

Read-onlyIdempotent

Lists all supported social media placements or one platform's, including frame size, aspect ratio, safe-area insets, usable box, and source URL, so you can browse, compare, or find a placement ID.

Instructions

List every supported social media placement (or one platform's) with frame size, aspect ratio, safe-area insets in px, usable box and first-party source URL, in one response. Use this to browse, compare platforms, or find a placement id; use get_social_media_placement when you already know the id and also need a crop/letterbox plan for your footage. The list is a fixed built-in dataset returned whole, with no paging.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_social_media_placements"
  }
}

Input Schema

Name	Required	Description	Default
`platform`	No	Only return placements for this platform. Omit for all platforms.

Output Schema

Name	Required	Description	Default
`count`	Yes
`platform`	Yes
`placements`	Yes
`canonicalDatasetUrl`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedv1.0.0Oct 24, 2026

addedInput schema / additionalProperties
```
Added value: +false
```

changedInput schema / properties / platform / description

Previous value: -"Optional platform filter."New value: +"Only return placements for this platform. Omit for all platforms."

changedInput schema / properties / platform / enum

Previous value: -[
-  "instagram",
-  "tiktok",
-  "youtube",
-  "linkedin",
-  "x",
-  "facebook"
-]New value: +[
+  "instagram",
+  "tiktok",
+  "youtube",
+  "facebook",
+  "linkedin",
+  "x"
+]

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "canonicalDatasetUrl": {
+      "type": "string"
+    },
+    "count": {
+      "type": "integer"
+    },
+    "placements": {
+      "items": {
+        "properties": {
+          "firstPartySourceUrl": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "id": {
+            "type": "string"
+          },
+          "kind": {
+            "enum": [
+              "video",
+              "image"
+            ],
+            "type": "string"
+          },
+          "label": {
+            "type": "string"
+          },
+          "platform": {
+            "type": "string"
+          },
+          "ratio": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "referenceToolUrl": {
+            "type": "string"
+          },
+          "safeAreaInsetsPx": {
+            "anyOf": [
+              {
+                "properties": {
+                  "bottom": {
+                    "type": "integer"
+                  },
+                  "left": {
+                    "type": "integer"
+                  },
+                  "right": {
+                    "type": "integer"
+                  },
+                  "top": {
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "top",
+                  "right",
+                  "bottom",
+                  "left"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "safeAreaKind": {
+            "enum": [
+              "published",
+              "unpublished",
+              "noOverlay",
+              "region"
+            ],
+            "type": "string"
+          },
+          "size": {
+            "anyOf": [
+              {
+                "properties": {
+                  "height": {
+                    "type": "integer"
+                  },
+                  "width": {
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "width",
+                  "height"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "unpublishedReason": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "usableBoxPx": {
+            "anyOf": [
+              {
+                "properties": {
+                  "height": {
+                    "type": "integer"
+                  },
+                  "width": {
+                    "type": "integer"
+                  }
+                },
+                "required": [
+                  "width",
+                  "height"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "usableSharePct": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "id",
+          "platform",
+          "label",
+          "kind",
+          "ratio",
+          "size",
+          "safeAreaKind",
+          "safeAreaInsetsPx",
+          "usableBoxPx",
+          "usableSharePct",
+          "unpublishedReason",
+          "firstPartySourceUrl",
+          "referenceToolUrl"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "platform": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "required": [
+    "count",
+    "platform",
+    "canonicalDatasetUrl",
+    "placements"
+  ],
+  "type": "object"
+}

First observedv0.3.0Oct 23, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, closed-world and non-destructive, so the safety profile is covered. The description adds genuinely new behavior: a fixed built-in dataset returned whole with no paging, which tells the agent not to loop for pages and not to expect live data. It stops short of stating ordering or per-platform completeness guarantees.

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?

Three sentences, zero filler. The returned-field inventory and the no-paging guarantee are front-loaded, and the sibling routing clause lands last where it is most actionable.

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-value detail need not be spelled out, and the description still summarizes the shape. For a single optional-filter list tool over a static dataset, nothing an agent needs in order to call it correctly is missing.

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 coverage is 100% and the single enum parameter is fully documented as 'Only return placements for this platform. Omit for all platforms.' The description only gestures at it with '(or one platform's)', adding no syntax or default nuance beyond the schema, so the baseline 3 applies.

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?

States a specific verb and resource (list social media placements) and enumerates the payload an agent gets back: frame size, aspect ratio, safe-area insets, usable box, and source URL. It also names the sibling it is not (get_social_media_placement), so the tool is distinguishable without opening a schema.

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

Usage Guidelines5/5

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

Gives explicit when-to-use cases (browse, compare platforms, find a placement id) and an explicit when-not plus the alternative: use get_social_media_placement when you already know the id and need a crop/letterbox plan. The routing decision is fully determined by the text.

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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