Square Post Skill

Purpose

Publish new content to Binance Square by running the local scripts in scripts/.

Supported post types:

• Text-only short posts
• Image posts with up to 4 images
• Long articles with a title and optional cover image
• Video posts with an auto-generated cover image

Do not hand-code API requests for normal posting. The scripts own upload, polling, cover generation, and publish behavior.

Runtime Dependencies

• Node.js 18 or newer. The scripts use native ES modules and the built-in fetch API.
• ffmpeg is required for video posts because post-video.mjs extracts the first frame as the cover image.
• ffprobe is required when a video duration is not provided by the user.
• Network access is required for Binance Square OpenAPI requests and presigned media uploads.

Authentication

Posting requires a Binance Square OpenAPI key.

Before posting:

• Prefer BINANCE_SQUARE_OPENAPI_KEY from the user’s environment if present.
• If it is not present, the scripts automatically check ~/.config/binance-square/openapi-key.
• If no valid key is found, ask the user to provide an API key first.
• If the user wants to reuse the key in future requests, save it with BINANCE_SQUARE_OPENAPI_KEY=<apiKey> node scripts/save-key.mjs; otherwise use it only for the current command environment.
• Tell the user they can create an API key at: https://www.binance.com/square/creator-center/home

Pass the key only via BINANCE_SQUARE_OPENAPI_KEY (env or saved file). Never write it into command arguments or print the full key — CLI args appear in ps output and shell history. When mentioning a key, show only the first 5 and last 4 characters, such as abc12...xyz9.

Scripts

All commands should be run from this skill directory.

Text Or Article Post

Use for text-only short posts or long articles without images.

node scripts/post-text.mjs --text "Hello #crypto $BTC"

Long article with title and no cover:

node scripts/post-text.mjs --text "Full article body..." --title "Market Report"

Flags:

• --text required, post text content
• --title optional, sets article-style content

Image Post

Use for short image posts or long articles with a cover image.

node scripts/post-image.mjs --text "Chart analysis" --images "./chart1.png,./chart2.png"

Long article with title and cover:

node scripts/post-image.mjs --text "Full analysis..." --title "Market Report" --cover "./chart.png"

Flags:

• --text required, post or article content
• --images required for short image posts only. Use comma-separated image paths with max 4.
• --title optional, sets article-style content. When present, do not pass --images.
• --cover required when --title is present for an article with media. Article mode supports exactly one cover image.

The script uploads each image, waits for processing, and publishes with the processed image URL returned by the backend. If --title is provided, it publishes contentType=2, requires --cover, and sends that uploaded image URL as cover only. If no --title is provided, it publishes contentType=1 and sends all --images as imageList.

Video Post

Use for video posts.

node scripts/post-video.mjs --video "./video.mp4" --duration 7.5 --text "My analysis"

Flags:

• --video required, local video path
• --duration required, video duration in seconds
• --text optional, post text content

The script uploads the video, waits for processing, extracts the first frame with ffmpeg, uploads that frame as the cover image, and publishes with cover included in the request.

If the user does not provide a duration, use ffprobe to determine it before running the script.

Agent Workflow

1. Resolve the API key (see Authentication). If unresolved, stop and ask the user before doing anything else.

2. Pick the script from user intent using the table below. Then validate against Constraints — if a constraint is violated, explain it and do not run.

   User intent	Script	Required flags
   Short text post	post-text.mjs	--text
   Long article, no media	post-text.mjs	--text --title
   Image short post (1–4 imgs, no title)	post-image.mjs	--text --images "<p1,p2,...>"
   Article with cover	post-image.mjs	--text --title --cover
   Video post	post-video.mjs	--video --duration (+ optional --text)

3. Disambiguate edge cases before running:
   • Title + exactly one image → that image is the cover (--cover, not --images).
   • Title + multiple images → stop and ask which single image is the cover.
   • Video without duration → run ffprobe first to get it.

4. Preserve user content exactly. Do not rewrite, translate, add hashtags/cashtags, or change punctuation. $coin and #topic text passes through verbatim — the backend parses them.

5. Run the script with BINANCE_SQUARE_OPENAPI_KEY injected into the command environment for one-time use (never as a CLI arg).

6. Report the result:
   • On success, return the ID and Link printed by the script.
   • If the script prints Success! with ID: unavailable and Link: unavailable, treat it as successful — /content/add returned 504 after submission, so no post ID or link is available.
   • On failure, surface the script error and any API code/message.

Constraints

• Images: max 4 per post; article cover is exactly 1 image.
• Video: max 1 per post.
• Images and video are mutually exclusive in a single post.
• Only attach media the user explicitly provided; do not auto-attach.
• Do not modify user-provided text. #topic and $coin are parsed server-side.
• Daily limits: 100 posts/day, 400 uploads/day.

Common Errors

• 220003: API key not found.
• 220004: API key expired.
• 220009: Daily post limit exceeded for OpenAPI.
• 220014: Daily upload limit exceeded.
• 20002 or 20022: Sensitive words detected.
• 20013: Content length is limited.
• 20020 or 220011: Content body must not be empty.
• 30008, 2000001, or 2000002: Account or device posting restriction.

Scope

This skill only supports publishing new posts. It does not support:

• Reading, listing, or searching existing posts
• Editing or deleting posts
• Commenting, liking, or other interactions
• User profile or account management
• Scheduling or drafts