How do I install the Trello Set Thumbnail skill?

Run npx skillmds@latest add erich3000/trello-set-thumbnail in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Trello Set Thumbnail safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Trello Set Thumbnail?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Trello Set Thumbnail free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Trello Set Thumbnail?

erich3000 (@erich3000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Trello Set Thumbnail by erich3000 — Agent Skill

Name: Trello Set Thumbnail
Author: erich3000

Trello Set Thumbnail

This skill should be used when the user asks to "set thumbnails for Trello cards", "add thumbnail frontmatter", "populate thumbnail field", or wants to add a `thumbnail` frontmatter field from the first image found in imported Trello card Markdown files.

erich3000 702989d 2 files · 4.3 KB Updated Sep 17, 2026

File contents

Trello Set Thumbnail Skill

Add or update a thumbnail frontmatter field in imported Trello card notes, using the first image found in each file.

When to Use

After running trello-import (and optionally trello-media-download)
When card notes should have a thumbnail field pointing to their first image

Bundled Script

The thumbnail setter script is bundled at scripts/set_thumbnail_frontmatter.py. Run from the repository root:

python3 .claude/skills/trello-set-thumbnail/scripts/set_thumbnail_frontmatter.py

Options

Flag	Description
`--root PATH`	Directory to scan (default: `TRELLO_IMPORT`)
`--pattern GLOB`	File pattern under root (default: `**/index.md`)
`--field NAME`	Frontmatter field name to set (default: `thumbnail`)

Behavior

Scan each Markdown file for the first ![alt](target) image link in the body (below frontmatter)
Add or update the thumbnail field in YAML frontmatter with that image target
Remove any legacy thumnbnail (typo) field if present
Skip files without frontmatter or without images

Recommended Workflow

Run trello-import to generate card notes.
Run trello-media-download to localize images.
Run trello-set-thumbnail to populate frontmatter thumbnails.

Frequently asked questions