Guides X post copy creation and optimization. Use for generating publish-ready posts, threads, and content that performs on X. Suitable for copy agents, design agents (image specs), and video agents (video post specs).
When invoking
On
first use
, if helpful, open with 1-2 sentences on what this skill covers and why it matters, then provide the main output. On
subsequent use
or when the user asks to skip, go directly to the main output.
Output: Publish-Ready Copy
This skill enables agents to generate X post copy that can be published directly. Output includes character-counted text, thread structure, and platform-compliant formatting.
Character Limits
Type
Limit
Notes
Standard post
280 characters
Most users
Premium
25,000 characters
X Premium subscribers
URL
Counts as 23 chars
t.co shortens all links
Emoji
~2 chars each
Varies by emoji
Optimal Lengths (Engagement)
Use Case
Characters
Purpose
General
71-100
Sweet spot for engagement
Promotional
120-130
Product/offer posts
Question
60-80
Drive replies
Retweet-friendly
~116
Leaves room for "RT @user:"
Thread Format
Structure
3-5 connected posts; number as 1/5, 2/5, etc.
First post
Strong hook; no "thread" in first line
Last post
CTA, summary, or question
Each post
~80 chars; can stand alone
Post Structure (Hook + Value + CTA)
Part
Ratio
Guideline
Hook
10%
First 1-2 lines; question, fact, or emotion; ~50 chars
Value
70%
Practical info; use thread for depth
CTA
20%
Call for reply, question, or action
End with open question to drive replies. Thread structure can extend impressions ~10x.
Algorithm (Grok AI)
Signal Weights
Signal
Impact
Replies
Highest (~54-75x likes); quality > quantity
Author replies
Active reply chains ~75x visibility
Bookmark
2026 signal; saves boost recommendation
Media
Images/video ~2x; video 2-4x exposure
External links
Reduce score ~50%; prefer internal refs
Post limit
5-8/day; >10/day reduces later visibility ~80%
Content
Open questions, controversial views, stories; avoid "RT if agree" bait.
Posts tested in small group first; early interaction (first 30 min) decides reach. Niche consistency helps SimClusters match.
Link Optimization
Practice
Guideline
Penalty
External links ~-50%; Regular accounts: link posts 0% engagement since 2025
Placement
Put link in reply, not main post
Ratio
Max 1 link per 5 posts
Premium
Premium+ safest for links (~0.25-0.3% engagement)
Preview
Title ≤70 chars, description ≤200 chars; 1200×628 image
Premium Impact
Tier
Reach
Link posts
Regular
<100/post
0% engagement
Premium ($8)
~600/post
~0.25-0.3%
Premium+ ($40)
~1550/post
Safest for links
Premium ~10x reach vs Regular. If X is core channel, Premium helps.
Video
Exposure
2-4x vs text
Length
8-30s short video preferred
VQV
High video completion boosts score 2-3x
Content Ratio
Type
Share
Use
Value
70%
Education, how-to, insights
Interaction
20%
Polls, questions, AMA
Promo
10%
Product, offers
Twitter Cards + SEO
Cards (og:image, title, description) boost CTR ~64%, engagement ~26%. Use for Social SEO; X traffic can accelerate Google indexing. For programmatic SEO (template + data pages at scale), use programmatic-seo.
Image Specs (for Design Agents)
Format
Dimensions
Use
Single image
1200×675 (16:9)
Best visibility; no crop
Square
800×800
Single image
Profile
400×400
Avatar
Header
1500×500 (3:1)
Banner
File
~5MB; JPG/PNG
Over 5MB may compress
Output Format
When generating X copy, provide:
Post text
with character count
Hashtags
(if used; 1-3 recommended)
Thread structure
(if thread)
Image specs
(if design agent needs dimensions)