Tip: Claude Code 2.1.281 adds `"attribution": false`, MCP checks in `claude plugin validate`, and `--agents` from a JSON file

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Setting `"attribution": false` in settings.json now hides all commit and PR attribution. Older CLIs skip a settings file that contains it, so keep the object form in files shared across versions. `claude plugin validate` now reports `.mcp.json` entries that would be silently dropped at load, undeclared `${user_config.*}` references, insecure URLs, and unquoted `${CLAUDE_PLUGIN_ROOT}` in shell-form hooks. `--agents` with `-p` now accepts a path to a JSON file, and ctrl+enter 'send now' moves running tools to the background instead of cancelling the turn.