PrismPoster Creator Tools

List social media placement specs

list_social_media_placements

Read-onlyIdempotent

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, plus links to the same dataset as CSV, JSON and its DOI. 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 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
`datasetCsvUrl`	Yes
`datasetDoiUrl`	Yes
`datasetJsonUrl`	Yes
`canonicalDatasetUrl`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedOct 23, 2026

TDQS

A4.4/5.0

Behavior4/5

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

Annotations already cover read-only, idempotent, closed-world, so the description's additive value is "a fixed dataset returned whole, with no paging" — a genuinely useful operational fact that prevents an agent from hunting for pagination params. The field enumeration is somewhat redundant with the output schema, which keeps this short of a 5.

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?

Front-loaded with verb + resource, then routing guidance, then a behavioral caveat — a logical order with no filler sentences. The middle clause packing ~7 returned fields is dense but still readable.

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?

For a single-optional-param, read-only list tool with an output schema and full annotation coverage, nothing an agent needs is missing: scope, filter behavior, no-paging semantics, and the alternative tool are all stated.

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% and the single enum param already says "Omit for all platforms." The description only echoes this with "(or one platform's)," adding no format, default, or edge-case detail beyond the schema.

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 every supported social media placement") and immediately names the returned data (frame size, aspect ratio, safe-area insets, usable box, source URL, CSV/JSON/DOI links). It is clearly distinguished from get_social_media_placement in the same breath, so an agent can pick between them without opening either 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?

Explicit routing: "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." Both the when-to-use and the named alternative with its selection condition are present.

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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