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Reeling

by io.github.yomariano
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reeling_generate_video

Generate short-form video clips in seconds using fal.ai MiniMax H3 Max and Video-01 text-to-video AI models. Automatically saves the video to Cloudflare R2 storage and returns the public media URL ready for publishing to YouTube, TikTok, Instagram, etc.

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": {
      "prompt": "<prompt>"
    },
    "name": "reeling_generate_video"
  }
}

Input Schema

NameRequiredDescriptionDefault
promptYesText description of the video to generate (e.g. 'Cinematic drone shot of a futuristic neon city at sunset, 4k ultra detailed'). Optional if image_url is provided.
api_keyNoOptional Reeling API key.
image_urlNoOptional public image URL to animate into a video using image-to-video AI models.
fal_api_keyNoOptional custom fal.ai API key (BYOK). If omitted, the server default fal.ai key is used.
aspect_ratioNoAspect ratio for the generated video. '9:16' for vertical shorts/reels/tiktok, '16:9' for horizontal youtube.9:16

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

B3.2/5.0
Behavior3/5

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

With no annotations the description carries the full burden. It does disclose useful side effects: automatic save to Cloudflare R2 and a returned public media URL, plus a speed claim ("in seconds"). It omits whether generation is synchronous or a long-running job, any cost/quota or rate-limit behavior, and auth expectations despite an optional api_key param.

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?

Two tight sentences with no filler, and the core action is front-loaded. The trailing "ready for publishing to..." clause adds intent but is slightly promotional rather than operational.

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

Completeness4/5

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

It covers purpose, the storage side effect, and the return value, which is important since there is no output schema. It stops just short of the operational details (async vs sync, latency, cost) an agent generating media would want.

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%, so the schema already documents prompt, image_url, aspect_ratio, and the two keys. The description adds no parameter-level detail (e.g., interaction between prompt and image_url, or default behavior), so the baseline 3 applies.

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?

States a specific verb and resource ("Generate short-form video clips") and even names the underlying models (MiniMax H3 Max, Video-01). It doesn't, however, distinguish itself from the storyboard siblings (create_storyboard, stitch_storyboard), which is the nearest overlapping capability set.

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

Usage Guidelines2/5

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

The description gives no when-to-use or when-not-to-use guidance and never names an alternative. The only implied context is "ready for publishing to YouTube, TikTok, Instagram," which hints at downstream intent but does not help an agent decide between this and create_storyboard/stitch_storyboard.

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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