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Sweep 01 Oct 2026 · 17:27Z Build v2.1.287 508 read Stable v2.1.285 Latest v2.1.287 Next v2.1.287 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.286 ·

Built-in claude-test plugin gets clearer start-up errors and no longer requires a terminal session

The claude-test plugin now explains why it failed to start, gives new advice on duplicate copies, and drops its terminal-only message

Group of 2 Use it now Notable New Features
JSON All of v2.1.286
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5Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Claude TestArea: what it touches
New FeaturesKind: in v2.1.286,
What probably matters to youSection of the release

What

The built-in claude-test plugin was reworked. A plugin is a bundle of extra abilities Claude Code can load.

  • It registers a claude-test command and a skill hook, and connects a browser helper MCP server (an add-on that gives Claude tools to drive a browser).
  • When it fails to start, it now shows a specific fix, for example "Claude Test did not start: its browser helper is switched off for this project."
  • It records draft and run usage from saved.json and results.json.
  • If another copy of claude-test is installed, the message now says to disable or uninstall that one on the Installed tab of /plugin, keep the built-in one on, and restart Claude Code. Before, it pointed to the other copy's marketplace name and asked for a new session.
  • The message saying Claude Test needs an interactive Claude Code session in a terminal, and the "Claude Test cannot run in this session yet" message, are gone from where they were.

Why

If Claude Test fails to start, the error now says what to change. The findings suggest it may no longer be limited to interactive terminal sessions.

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Names in the bundleclaude-test
What the documentation says
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether Claude Test is available to everyone or held behind a switch is not known.

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