LinkedIn Poster

Use when you need to post content to LinkedIn, including text posts, image posts, and

Security Scan

The skill's requirements and instructions are consistent with a LinkedIn posting helper; it asks for the LinkedIn channel config (access token & person URN) and otherwise contains no unexpected dependencies or installers.

Purpose & Capability

Name/description match the actual requirements and behavior: the skill is an instruction-only LinkedIn poster and only requires a channels.linkedin config (accessToken and personUrn). There are no unrelated env vars or binaries requested.

Instruction Scope

SKILL.md restricts actions to composing posts and uploading images via the linkedin channel using the message tool. It explicitly allows local file paths, file:// URLs, and remote URLs for images — which is appropriate for image posting but means the agent will need to access local files or fetch remote content when asked. This is within scope but has expected privacy implications (local file access, network fetches).

Install Mechanism

No install spec or code files are present (instruction-only), so nothing is written to disk or downloaded during install — lowest-risk installation profile.

Credentials

The skill requires channels.linkedin config (accessToken with w_member_social and personUrn), which is proportional and necessary for posting. No unrelated credentials or broad environment access are requested.

Persistence & Privilege

The skill is not always-on, does not request elevated platform privileges, and does not modify other skills or global agent settings. It relies on the platform's linkedin channel to perform actions.

Assessment

This skill appears to do what it says. Before installing, ensure you: (1) store a LinkedIn access token with the minimal required scope (w_member_social) in channels.linkedin and rotate it regularly; (2) understand that posting images may require the agent to read local files or fetch remote URLs — avoid giving it access to sensitive files you don't want uploaded; (3) confirm the agent will ask for owner approval before sending posts (the SKILL.md recommends confirmation but enforcement depends on your agent configuration); and (4) review who else can access channels.linkedin in your environment so tokens aren't shared unintentionally.

LinkedIn Posting

Overview

Post text and images to LinkedIn via the message tool using the linkedin channel. Supports text-only posts, image posts (local files or URLs), and #BuildInPublic updates.

Prerequisites

The linkedin channel must be configured in channels.linkedin with:

• accessToken: OAuth 2.0 token with w_member_social scope
• personUrn: Your LinkedIn person URN (e.g. urn:li:person:Abc123)

Posting Text

Use the message tool to send a text post:

message send --channel linkedin --text "Your post content here"

The post goes to the authenticated user's LinkedIn feed as a public post.

Posting with Images

Two-step process:

1. Create the image — generate or locate the image file (PNG/JPG/GIF/WebP)
2. Post with image — use message send with the --media flag:

message send --channel linkedin --text "Post caption" --media /path/to/image.png

Supported image sources:

• Local file paths: /Users/david/image.png
• file:// URLs: file:///Users/david/image.png
• Remote URLs: https://example.com/image.png

Image Upload Flow (internals)

The extension handles a 3-step LinkedIn UGC API flow automatically:

1. Register upload → gets uploadUrl + asset URN
2. PUT binary to uploadUrl
3. Create UGC post with asset reference

You don't need to manage this — just provide the image path.

Best Practices

• Always confirm post content with the owner before posting
• Keep posts concise — LinkedIn favors 150-300 word posts
• Add hashtags at the end, not inline (3-5 max)
• For #BuildInPublic: include what you built, what you learned, a visual
• Image sizing: 1200x627px for link previews, 1080x1080 for square posts
• Never post without explicit owner approval

Post Templates

#BuildInPublic Update

🚀 [What you built today]

[2-3 sentences about what it does and why it matters]

Tech stack: [list]

[Screenshot or diagram]

#BuildInPublic #[topic] #[tech]

Project Milestone

✅ [Milestone achieved]

[Brief context — what, why, how]

Key learnings:
→ [Learning 1]
→ [Learning 2]
→ [Learning 3]

Next up: [what's coming]

#[project] #[topic]

Technical Deep-Dive

💡 TIL: [Thing you learned]

[Explanation in 2-3 paragraphs]

[Code snippet or diagram if relevant]

#TIL #[topic] #[tech]

Troubleshooting

Error	Cause	Fix
401 Unauthorized	Token expired	Re-authenticate, update channels.linkedin.accessToken
403 Forbidden	Missing w_member_social scope	Re-create OAuth app with correct scopes
Image upload 400	File too large (>10MB)	Compress image before uploading
Empty postUrn	API didn't return ID	Post likely succeeded — check LinkedIn feed