Repurpose one post for every platform with AI

Writing one good post is work. Rewriting it six times to fit six networks is the part people skip, and it shows: a LinkedIn essay squeezed into X, or a hashtag pile pasted onto LinkedIn. SocialCannon’s repurpose endpoint does that rewriting for you. Send one source text and the networks you want, and get back a version for each, checked against that network’s rules. You can review the versions first or publish them in the same call.

What repurposing does

For each target network, the model rewrites your source to suit that network’s length, tone and conventions. It is instructed to keep names and titles exactly as written, to keep every date, price, place and link accurate (links character for character), never to add facts or links of its own, and to write in the same language and regional variety as your source. The result is then edited to remove common AI-writing patterns, and its text is checked against the network’s length and format rules. For X, Instagram, TikTok, LinkedIn and YouTube, a version that is still too long gets up to two best-effort shortening passes when at least 40 characters of room remain, dropping the least important details first. If it still does not fit, its validation result says so. A model can make mistakes, so check that the details you care about survived; that is why previewing is the default.

In requests, X is written as twitter. The other networks use their lowercase names: facebook, instagram, linkedin, tiktok and youtube. The same names are the keys of accountIds, mediaUrls and platformOptions.

Step 1: Preview the variants

Preview is the default mode. It returns the versions and publishes nothing.

curl -X POST https://socialcannon.app/api/v1/posts/repurpose \
  -H "Authorization: Bearer TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "sourceContent": "Our spring workshop is on 14 March at 18:00 in Leeds. Tickets are £12 at example.com/workshop and include a printed field guide.",
    "targetPlatforms": ["linkedin", "instagram"],
    "tone": "friendly and concise"
  }'

The response lists one variant per platform with its content, characterCount and a validation result, plus allValid for the whole set. Preview validation runs without media, so Instagram, TikTok and YouTube variants are reported as needing media, and allValid is false. That error is expected: it clears when you publish with suitable mediaUrls (a video file for YouTube), and TikTok also needs a privacy level in platformOptions. Look at the other errors, such as length, to judge the text. If the model cannot produce a usable version for every network you asked for, the whole request fails and names the missing networks in details.missingPlatforms; send it again without them.

Shape the output

• tone is a short free-text description, up to 100 characters, such as professional or playful, no emojis.
• appendToAll adds the same text to every variant, for a sign-off or a campaign hashtag.
• appendContent sets the appended text per network, for example a different link per network. A non-empty value for a network replaces appendToAll there; an empty one falls back to it.
• mediaUrls attaches media per network, which Instagram, TikTok and YouTube need.

Appended text is added after the rewrite, so the model never rewords it. Where possible, the rewrite is shortened to leave room for it within the network’s limit; if too little room is left, validation reports the variant as too long.

Step 2: Publish in one call

When you trust the output, or after you have checked a preview, switch to post mode and name the account for each network. Post mode publishes immediately; the endpoint has no scheduledAt, and one sent here is ignored.

curl -X POST https://socialcannon.app/api/v1/posts/repurpose \
  -H "Authorization: Bearer TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "sourceContent": "Our spring workshop is on 14 March at 18:00 in Leeds. Tickets are £12 at example.com/workshop.",
    "targetPlatforms": ["linkedin", "facebook"],
    "mode": "post",
    "accountIds": { "linkedin": "LINKEDIN_ACCOUNT_ID", "facebook": "FACEBOOK_ACCOUNT_ID" },
    "appendToAll": "#SpringWorkshop"
  }'

Post mode generates fresh variants, so the published text can differ from an earlier preview. If you need exactly the previewed wording, take each variant’s content from the preview and publish it with POST /api/v1/posts instead, optionally with a scheduledAt.

Plans and limits

Network access follows your plan as well: X needs a paid plan. On Free, a preview that includes X is refused before any text is generated; in post mode the X target fails while the other networks can still publish. See the pricing page for details.

Repurposing from an AI agent

The MCP tool repurpose_content runs the preview, so an assistant can draft versions for each network and show them to you. Once you approve, it publishes each one with create_post. The tool takes text only, so for Instagram, TikTok and YouTube the assistant must add the media (and TikTok’s privacy level) to each create_post call. Set it up with the MCP server guide. For a manual alternative that sends the same text everywhere, see cross-posting from one API, and the API reference documents the endpoint.