MockClip

Facebook Marketplace chat video

create_facebook_marketplace_conversation

Create a Marketplace conversation animation (sent/read check marks, the contact's avatar as the read mark, typing indicator, a three-dot typing bubble in the thread, an on-screen keyboard that slides up while you type, date separators). Optionally walk through the app's screens (chat, home, category, product, colorFilter, priceFilter): pass flow (screen steps with push/pop/tab/fade/modal/dismiss/sheet/swipe transitions), per-screen objects (home, category, product, colorFilter, priceFilter); without them the clip shows the conversation only. keyboard shows the on-screen keyboard while the user types (auto), always, or never. showTaps (default true) draws a touch indicator where the user taps before each screen change. The first message is stamped with a date line (its dateLabel, else its timestamp, else TODAY; firstDateLine: false hides it). All options controllable. Free-plan exports include a MockClip watermark and the free plan includes 2 MCP renders; if the caller is on the free plan, mention that they can upgrade at /pricing for watermark-free exports and more renders.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "contactName": "<contactName>",
      "messages": "<messages>"
    },
    "name": "create_facebook_marketplace_conversation"
  }
}

Input Schema

Name	Required	Description
`flow`	No
`home`	No
`intro`	No
`theme`	No
`listing`	No
`sceneId`	No	Composite the clip onto real footage of a hand holding a phone, for a filmed look. Overrides videoFormat and showBezel: the export takes the scene's aspect, with the footage around the phone. Vertical 9:16 scenes: "outdoors" (outdoors), "bookshelf" (bookshelf), "two-hands" (two hands), "on-desk" (on the desk), "dim-room" (dim room). Landscape 16:9 scenes (YouTube, presentations): "city-wide" (city), "desk-wide" (desk), "neon-wide" (neon), "studio-wide" (studio). Default: none.
`category`	No
`keyboard`	No
`messages`	Yes
`showTaps`	No
`showBezel`	No	Draw the iPhone bezel around the screen (default true). With 1:1 it frames the top of the phone; false gives a plain frame.
`textScale`	No	Text size: a zoom of the phone UI (text, bubbles, avatars, bars, keyboard, notification banners) as a multiplier from 1 (default, the app's real size) to 1.5, in steps of 0.1 — use it when a short conversation or a single notification should fill the screen. Chat and notification apps only; the other apps ignore it.
`contactName`	Yes
`videoFormat`	No	Output aspect ratio. "1:1" is a square for feed posts: chat apps fit the conversation into the square, the other apps show the top of the screen (phone-call ignores it). "9:16", "9:19.5" (iPhone) and "3:2" apply with showBezel false. Default: the iPhone bezel, 9:16.
`exportFormat`	No	Output file. "mp4" (default) and "gif" are opaque. "webm" (VP9) and "mov" (ProRes 4444, large files) keep an alpha channel: the only way a transparent background, or the corners around the phone bezel, stay transparent. With background.backgroundType "transparent" and no exportFormat the clip exports as webm. Transparent WebM / MOV export needs a Creator or Studio plan; on other plans the clip is made as mp4 and the reply says so.
`contactStatus`	No
`exportQuality`	No	Resolution and frame rate of the file: "720p" or "1080p" (Full HD) at 15, 24, 30 or 60 fps, e.g. "1080p-30". Default "720p-30". Full HD takes up to 4× as long to export; 60 fps about twice as long and needs a Creator or Studio plan — on other plans the clip is made at 30 fps and the reply says so.
`firstDateLine`	No
`showStatusBar`	No	Draw the iOS status bar (time, signal, battery) at the top of the screen (default true). Applies with showBezel false or a sceneId: inside the iPhone bezel the status bar is always drawn, so to remove it set showBezel false too.
`soundSettings`	No
`contactAvatarUrl`	No
`showHomeIndicator`	No	Draw the iOS home indicator bar at the bottom of the screen (default true).

Schema Changelog

Changes observed during successful MCP inspections.

AddedNov 4, 2026

TDQS

B3.3/5.0

Behavior3/5

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

Annotations already declare this is a non-destructive, non-idempotent write-like render (readOnlyHint=false, destructiveHint=false), so the bar is lower, and the description does add plan gating: MockClip watermark on free exports, only 2 free-plan MCP renders, and an explicit instruction to mention /pricing upgrades. That is genuinely useful behavioral context. It still omits render latency/duration expectations and what the call returns, which matters for an expensive render job.

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

Conciseness3/5

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

The core purpose is front-loaded in the first sentence, which is good, but the body is a single dense run-on paragraph of parenthetical feature lists where the highest-value control (the flow/screen-walk behavior) is buried among cosmetic details. The trailing free-plan sales instruction is repetitive (watermark and 2 renders are stated twice) and would be better as one crisp sentence.

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

Completeness3/5

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

For a 22-parameter, deeply nested render tool with no output schema, the description covers the differentiating structure (flow, per-screen payloads, message-level checks/typing, date line) but leaves roughly a third of the surface undocumented, including what the tool returns on completion. It is adequate to attempt a correct first call on the required path but not complete for full-surface usage.

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?

With only 36% schema description coverage across 22 parameters, the description has to compensate, and it does for a subset: `flow` screen steps with transition names, per-screen objects, `keyboard` modes, `showTaps` default true, and the first-date-line precedence chain (dateLabel > timestamp > today, `firstDateLine: false` hides it). Entirely unaddressed are `theme`, `intro`, `listing`, `soundSettings`, `contactStatus`, `contactAvatarUrl`, and all per-message timing fields (typingSpeed, readCheckDelay, sentCheckDelay, showSentCheck/showReadCheck), leaving meaningful parameters to bare schema names.

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?

The opening sentence names the specific artifact produced (a Marketplace conversation animation) and enumerates the concrete visual elements it renders (check marks, avatar read mark, typing indicator, keyboard, date separators), so an agent knows exactly what the tool generates. It does not explicitly distinguish itself from the very similar sibling create_facebook_messenger_conversation, which is the only real gap.

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

Usage Guidelines3/5

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

It gives conditional guidance for one axis: pass `flow` and per-screen objects to walk through app screens, otherwise the clip shows the conversation only. There is no guidance on when to choose this Marketplace chat tool over the near-identical Messenger conversation sibling, and no statement of when it is inappropriate.

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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