trello-set-thumbnail

name	trello-set-thumbnail
description	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. Use when this capability is needed.
metadata	{"author":"erich3000"}

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

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

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