<h2>What's changed</h2> <ul> <li>Added <code>--marketplace &lt;source&gt;</code> to <code>claude plugin install</code>: adds the marketplace if needed, under the same policy checks as <code>claude plugin marketplace add</code>, then installs the plugin from it</li> <li>Added an <code>effort</code> parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for</li> <li>Added <code>CLAUDE_CODE_OVERLOADED_RETRY_BASE_DELAY_MS</code> environment variable to set a longer base delay for the backoff when retrying an overloaded (529) request</li> <li>Added <code>prompt.autocomp