Cowork plugin page shows "Version 1" instead of the version from plugin.json
Environment
- Claude Desktop for macOS, version 1.37937.3 (28dcf5) — Cowork, Teams plan
- Plugin uploaded as zip via the Cowork plugin upload flow
Description
The plugin detail page in Cowork shows "Version 1" instead of the semantic version declared in the plugin's .claude-plugin/plugin.json.
This is a regression: on 2026-08-26 the same page correctly displayed "0.7.0" for our plugin. From 2026-08-27 onwards, uploading new versions of the same plugin (0.8.2, 0.9.0, 0.9.1, 0.9.2) consistently shows "Version 1".
We verified that the uploaded zips were correct: each zip's plugin.json demonstrably contained the right version value (checked by content and byte size before upload), and the new skill content was live after installation — only the displayed version string is wrong.
Steps to reproduce
- Create a plugin with
.claude-plugin/plugin.jsoncontaining e.g."version": "0.9.2" - Package it as a zip and upload/install it in Cowork
- Open the plugin's detail page
Expected
The page shows the version from plugin.json (e.g. "0.9.2").
Actual
The page shows "Version 1".
Impact
During acceptance testing we could not verify which plugin version was actually installed via the UI. Our workaround is to verify installed versions by checking version-specific markers in skill content, which is error-prone. This matters extra because upload failures are otherwise silent (see #56376), so the version display is the main feedback channel that an upload landed.