What Capable Markdown for Jira is

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The app adds exactly two things you can see: a "Markdown" panel on the issue view, which shows one tab per .md attachment with a rendered preview plus Add, Edit, Delete and sort controls, and a "Capable Markdown" global page under Apps, which lists Markdown documents across projects.

Behind those it also keeps a small per-issue search index (so the global page can find issues that hold Markdown) and two attachment triggers that maintain it.

The editor is a full-screen modal with a live side-by-side Markdown editor, a formatting toolbar, 17 built-in templates and support for fenced diagram code blocks (mermaid, plantuml, graphviz, d2 and 23 others) that render as images through Capable's hosted service.

#At a glance

A Jira work item with the Capable Markdown panel open, showing tabs for User Journey and Architecture Design, a rendered software architecture document, and Edit and Add buttons.
The panel sits below the description on the work item, with one tab for each Markdown document attached to it.

#How to show the panel

Close-up of a Jira work item header with the apps button open and a small menu listing Markdown and Add apps.
The apps button beneath the work item summary lists Markdown, which puts the panel on that work item.

The short version.