# PrismPoster Creator Tools (remote · www.prismposter.com)

Social media frame sizes with sourced safe areas, plus aspect-ratio, bitrate and subtitle tools.

- Trust score: 72/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- remote · `www.prismposter.com`: 72/100 (this document), [markdown](https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp.md), [page](https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp)
- npm · `@prismposter/creator-tools`: 53/100, [markdown](https://verifymcp.io/servers/com-prismposter-creator-tools/prismposter-creator-tools.md), [page](https://verifymcp.io/servers/com-prismposter-creator-tools/prismposter-creator-tools)

## Channel facts

- Endpoint: `https://www.prismposter.com/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.5.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-23.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 65/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1540 tokens (~220/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

**Unverified: 1 category.** A category scored 0 because we could not verify it: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### How do I install the PrismPoster Creator Tools MCP server?

PrismPoster Creator Tools is a hosted endpoint at https://www.prismposter.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-prismposter-creator-tools 'https://www.prismposter.com/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-prismposter-creator-tools": {
      "url": "https://www.prismposter.com/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-prismposter-creator-tools": {
      "type": "http",
      "url": "https://www.prismposter.com/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-prismposter-creator-tools]
url = "https://www.prismposter.com/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-prismposter-creator-tools": {
      "type": "remote",
      "url": "https://www.prismposter.com/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-prismposter-creator-tools --url 'https://www.prismposter.com/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-prismposter-creator-tools:
    url: "https://www.prismposter.com/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-prismposter-creator-tools": {
      "Transport": "http",
      "Url": "https://www.prismposter.com/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-prismposter-creator-tools -t streamable-http -u 'https://www.prismposter.com/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-prismposter-creator-tools": {
      "type": "http",
      "url": "https://www.prismposter.com/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-23 (score 72)

First indexed and scored.

## MCP tools (7)

### `get_social_media_placement` (~243 tokens)

Get one social media placement spec

Look up one social media placement by id and return its frame size, aspect ratio, first-party safe-area insets in px, usable box, and the official page the figures came from. Pass sourceWidth and sourceHeight together to also get the centre-crop and letterbox plan that fits your footage to this placement. Use this when you know the target placement; use list_social_media_placements to browse or compare, check_safe_area to test whether an element is clear of the platform UI, and calculate_aspect_ratio for a ratio that is not a platform placement. For TikTok the insets are null with a reason, because TikTok publishes no fixed safe area. Errors on an unknown id (the message lists valid ids) or on only one source dimension.

Input parameters:

- `id` (string, required): Placement id, camelCase (instagramReels) or kebab-case (instagram-reels), e.g. tiktok-video, youtube-shorts, youtube-channel-banner.
- `sourceHeight` (integer): Height of your source footage in px. Requires sourceWidth.
- `sourceWidth` (integer): Width of your source footage in px. Requires sourceHeight.

Output parameters:

- `firstPartySourceUrl` (string|null)
- `fit`
- `id` (string)
- `kind` (string)
- `platform` (string)
- `ratio` (string)
- `referenceToolUrl` (string)
- `regionPx`
- `safeAreaInsetsPx`
- `safeAreaKind` (string)
- `size` (object)
- `unpublishedReason` (string|null)
- `usableBoxPx`
- `usableSharePct` (number|null)

### `list_social_media_placements` (~130 tokens)

List social media placement specs

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.

Input parameters:

- `platform` (string): Only return placements for this platform. Omit for all platforms.

Output parameters:

- `canonicalDatasetUrl` (string)
- `count` (integer)
- `datasetCsvUrl` (string)
- `datasetDoiUrl` (string)
- `datasetJsonUrl` (string)
- `placements` (array)
- `platform` (string|null)

### `check_safe_area` (~213 tokens)

Check an element against a placement safe area

Check whether a rectangle (a caption, logo or button, in px on the placement's own frame, origin top-left) stays inside the placement's safe area, and by how many px it intrudes past each edge if not. Use this to validate a layout before export; use get_social_media_placement for the raw insets. Returns verdict "inside", "intrudes" or "unknown"; "unknown" means the platform publishes no fixed safe area (TikTok) and comes with the reason instead of a guess. Errors on an unknown placement id or a box with non-positive size.

Input parameters:

- `height` (integer, required): Element height in px.
- `placementId` (string, required): Placement id, camelCase or kebab-case, e.g. instagram-reels.
- `width` (integer, required): Element width in px.
- `x` (integer, required): Element's left edge in px from the frame's left edge.
- `y` (integer, required): Element's top edge in px from the frame's top edge.

Output parameters:

- `box` (object)
- `firstPartySourceUrl` (string|null)
- `frame` (object)
- `intrusionPx`
- `placementId` (string)
- `referenceToolUrl` (string)
- `safeAreaKind` (string)
- `safeRectPx`
- `unpublishedReason` (string|null)
- `verdict` (string)
- `withinFrame` (boolean)

### `calculate_aspect_ratio` (~257 tokens)

Calculate aspect ratio and crop/pad plan

Reduce any pixel size to its simplest aspect ratio (1920x1080 is 16:9) and the nearest even size an H.264 encoder accepts, and, given a target ratio, solve the missing width or height and return the centre-crop and letterbox/pillarbox plans with the px trimmed or added per edge. Use this for arbitrary sizes and ratios (cinema 2.39:1, a client's 4:5); when the target is a named platform placement, use get_social_media_placement with sourceWidth/sourceHeight instead, which picks the right ratio for you. Errors on a non-integer or out-of-range size, or on only one of targetRatioW/targetRatioH.

Input parameters:

- `height` (integer, required): Frame height in px.
- `targetRatioH` (number): Height term of the target ratio, e.g. 16 for 9:16. Requires targetRatioW.
- `targetRatioW` (number): Width term of the ratio to crop or pad to, e.g. 9 for 9:16 or 2.39 for 2.39:1. Requires targetRatioH.
- `width` (integer, required): Frame width in px.

Output parameters:

- `cropPlan`
- `evenEncoderSize`
- `formattedRatio` (string|null)
- `input` (object)
- `padPlan`
- `ratio`
- `referenceToolUrl` (string)
- `solvedHeightForWidth` (number|null)
- `solvedWidthForHeight` (number|null)
- `targetRatio` (string|null)

### `estimate_video_bitrate` (~232 tokens)

Estimate video file size and bitrate

Video size and bitrate arithmetic for a clip of durationSec. Pass videoKbps to get the encoded file size (MB, GB, MiB, GiB); pass targetCapMb to get the highest video bitrate that fits that file size. Audio is added at audioKbps (default 192). Every answer also gives the highest video bitrate that fits Discord's 20 MB free upload limit. Kbps is decimal (1 kbps = 1000 bit/s) and MB is 1,000,000 bytes. Use it to plan an export or hit an upload cap; it does not inspect or encode files. Errors when neither videoKbps nor targetCapMb is given.

Input parameters:

- `audioKbps` (number): Audio track bitrate in kbps. Default 192; 0 for a silent clip.
- `durationSec` (number, required): Clip length in seconds.
- `targetCapMb` (number): File-size ceiling in MB (decimal), to solve for the maximum video bitrate.
- `videoKbps` (number): Video track bitrate in kbps, to estimate the file size.

Output parameters:

- `audioKbps` (number)
- `discordFreeMaxVideoMbps` (number)
- `discordFreeUploadCapMb` (number)
- `durationSec` (number)
- `estimatedSize`
- `referenceToolUrl` (string)
- `requiredBitrateForCap`
- `targetCapMb` (number|null)
- `videoKbps` (number|null)

### `convert_subtitles` (~193 tokens)

Convert subtitles between SRT and WebVTT

Convert subtitle text between SubRip (srt) and WebVTT (vtt), optionally shifting every cue by shiftMs, and return the converted text with the detected source format, cue count, parse warnings (with line numbers) and timing issues (overlapping, zero-length or out-of-order cues). Pass the file contents, not a path. Malformed blocks are skipped with a warning instead of failing the whole file. ASS/SSA input is not supported here; the @prismposter/creator-tools package converts it. Errors when no cue could be parsed, the input is over 2 MB, or the shift is beyond one hour.

Input parameters:

- `input` (string, required): The full SRT or WebVTT file contents as text.
- `shiftMs` (integer): Move every cue by this many ms: positive is later, negative earlier.
- `toFormat` (string, required): Format to convert to.

Output parameters:

- `cueCount` (integer)
- `endMs` (number|null)
- `issues` (array)
- `output` (string)
- `referenceToolUrl` (string)
- `shiftMs` (integer)
- `sourceFormat` (string)
- `targetFormat` (string)
- `warnings` (array)

### `estimate_tempo` (~205 tokens)

Estimate tempo, delay times and bar lengths

Tempo arithmetic for editing to music: pass tap timestamps (ms) to estimate BPM with a stability and confidence rating, or pass a known bpm. Either way it returns the beat length, a delay table (straight, dotted and triplet ms for each note value) and how many seconds a number of bars lasts in a time signature. It works on numbers you supply and does not analyse audio. Errors when neither input is given, the taps do not yield a tempo, bpm is outside 30-300, or the time signature is not one listed.

Input parameters:

- `bars` (number): Number of bars to convert into seconds. Default 16.
- `bpm` (number): Known tempo in beats per minute. Used instead of the tap estimate when both are given.
- `timeSignature` (string): Time signature for the bar length. Default 4/4.
- `timestampsMs` (array): Tap times in ms from a monotonic clock (performance.now()), in order.

Output parameters:

- `bars` (number)
- `barsDurationSeconds` (number)
- `bpm` (number)
- `delaysMs` (array)
- `quarterNoteMs` (number)
- `referenceToolUrl` (string)
- `tapAnalysis`
- `timeSignature` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp#diagnostics

## Score history

- 2026-10-23: 72

## Common questions

### What is the PrismPoster Creator Tools MCP server?

PrismPoster Creator Tools is an MCP server listed in the public MCP registry as com.prismposter/creator-tools. Social media frame sizes with sourced safe areas, plus aspect-ratio, bitrate and subtitle tools. This page covers its hosted endpoint (https://www.prismposter.com/api/mcp).

### Is the PrismPoster Creator Tools MCP server safe to use?

PrismPoster Creator Tools scores 72 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the PrismPoster Creator Tools MCP server expose?

PrismPoster Creator Tools exposes 7 tools: get_social_media_placement, list_social_media_placements, check_safe_area, calculate_aspect_ratio, estimate_video_bitrate, and 2 more. Their descriptions and schemas cost roughly 1,473 tokens of context every time the server is loaded.

### Does the PrismPoster Creator Tools MCP server require authentication?

No. We connected to PrismPoster Creator Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the PrismPoster Creator Tools MCP server still maintained?

PrismPoster Creator Tools is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://www.prismposter.com/api/mcp
- Repository: https://github.com/PrismPoster/creator-tools
- Website: https://www.prismposter.com/tools
- Changelog RSS feed: https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-prismposter-creator-tools/api-mcp