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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.129

Session Plugins from URLs

What

You can now load a session-only plugin directly from a remote .zip URL.

Usage
claude --plugin-url https://example.com/my-plugin.zip
claude --plugin-url https://example.com/a.zip --plugin-url https://example.com/b.zip
Details
  • --plugin-url is repeatable, like --plugin-dir.
  • Claude Code fetches the plugin archive, enforces a maximum archive size, extracts it, and loads it only for the current session.
  • If re-fetching fails but a cached copy exists, Claude Code can reuse the cached archive.
  • /doctor now labels these as Session-only plugins (--plugin-dir / --plugin-url).
Evidence

New CLI option and help text (search for "Fetch a plugin .zip from a URL for this session only (repeatable: --plugin-url A --plugin-url B)")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.129 →