Bluesky Marketing

How to Adapt a Campaign Brief for Bluesky

Adapting a campaign brief for Bluesky requires more than shortening text. Learn how to navigate the 300-character limit, prioritize accessibility, and leverage custom feeds.

Paul Onu

Aug 8, 2026 — 4 min read

Adapting a campaign brief for Bluesky requires a fundamental shift from broadcast marketing to high-context community engagement. While the interface may feel familiar to those used to microblogging, the underlying protocol and user expectations demand a specific approach to technical constraints, accessibility, and distribution. To successfully adapt a brief, you must prioritize a 300-character limit, mandatory alt-text standards, and a strategy for custom feeds rather than a singular global algorithm.

The Technical Constraints of the AT Protocol

Bluesky operates on the AT Protocol, which imposes specific hard limits that differ from legacy platforms. When moving a campaign from a general brief to a Bluesky-specific execution, your first task is a technical audit of the creative assets.

Character Count: 300 characters. This is slightly more generous than the legacy 280-character limit but still requires extreme brevity.
Image Limits: Up to 4 images per post. Supported formats include JPEG, PNG, and WebP.
Video Specs: As of late 2024, Bluesky supports video uploads. The current limits are typically 60 seconds per video, with a file size limit of approximately 50MB.
Link Cards: Bluesky automatically generates link previews, but unlike some platforms, you can manually edit the title and description of a link card before publishing if your tool supports it.

If you are coming from a visual-heavy workflow, such as an Instagram publishing workflow, you will need to strip away the reliance on long-form captions and focus on a single, punchy hook that fits within the 300-character window.

The Accessibility Mandate: Alt-Text as a Core Requirement

On many platforms, alt-text is treated as an optional SEO or accessibility checkbox. On Bluesky, it is a cultural expectation. The community frequently utilizes "Alt-Text Check" bots and filters. A campaign brief that fails to include descriptive alt-text for every image is likely to face community pushback or lower engagement.

When adapting your brief, create a dedicated column for "Accessibility Descriptions." Do not simply copy the caption into the alt-text field. The alt-text should describe the visual elements of the image for users with visual impairments, ensuring the campaign remains inclusive. This is a critical step in any pre-publish quality checklist, but it carries even more weight on the decentralized web.

The 'Custom Feed' Strategy

Unlike the monolithic algorithms of X or Facebook, Bluesky users choose their own feeds. There is no single "For You" page that every user sees. This changes how you brief for discovery.

Instead of chasing trending hashtags (which have varying utility on Bluesky), brief your team to identify specific Custom Feeds relevant to your industry. For example, if you are a tech founder, you want your content to appear in the "Tech" or "Open Source" feeds. To do this, your brief should specify the use of "seed words" or specific emojis that these community-built feeds use to aggregate content.

Example: Adapting a Product Launch Brief

Brief Element	General/Instagram Version	Bluesky Adaptation
Headline	The Future of Workspace Productivity is Here! #Launch	The workspace tool that stays out of your way. 300 chars or less.
Visuals	10-slide Carousel with text overlays.	2 high-res screenshots + 1 behind-the-scenes photo.
Call to Action	"Link in Bio" or "Swipe Up"	Direct URL in the post (Bluesky allows clickable links).
Metadata	30 Hashtags in the first comment.	Zero hashtags; focus on keywords for custom feed discovery.
Accessibility	Optional/Auto-generated.	Manual, descriptive alt-text for all 3 images.

Workflow: From Brief to Postly

Once the brief is adapted, the execution requires a tool that understands channel-specific variants. Using Postly, you can take your core campaign message and create a Bluesky-specific variant. This allows you to keep the core media assets while tailoring the 300-character copy and alt-text specifically for the AT Protocol environment.

When setting up this workflow, ensure your team uses the "Channel Variant" feature. This prevents the common mistake of cross-posting an Instagram caption that is 2,000 characters long, which would be truncated and broken on Bluesky. Similar to adapting a brief for Instagram, the goal is to respect the "physics" of the platform.

Failure Modes to Avoid

When adapting your brief, watch out for these common pitfalls that can alienate the Bluesky audience:

The "Ghost Town" Approach: Posting and leaving. Bluesky is highly conversational. Your brief should include a "Response Protocol" for the first 60 minutes after posting.
Automated Threading Errors: If your content exceeds 300 characters, do not rely on automatic threading unless you have manually checked the break points. A broken sentence in a thread looks unprofessional.
Ignoring the 'Mute' Culture: Bluesky users make heavy use of mute lists and word filters. If your brief relies on aggressive, repetitive sales language, you may find your account muted by large swaths of your target audience.

Next Steps for Marketing Teams

Audit your current assets: Check if your campaign videos are under 60 seconds and 50MB.
Rewrite for 300: Draft three variations of your primary message, keeping each under the character limit.
Define your feeds: Search Bluesky for feeds related to your niche and identify the keywords required to appear in them.
Validate in Postly: Use the shared validation checks to ensure your media meets the aspect ratio and format requirements before scheduling.