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Release highlights

• Added --marketplace <source> to claude plugin install : adds the marketplace if needed, under the same policy checks as claude plugin marketplace add , then...
• Added an effort parameter to the Agent tool, so Claude runs a sub-agent at the effort level you ask for
• Added CLAUDE_CODE_OVERLOADED_RETRY_BASE_DELAY_MS environment variable to set a longer base delay for the backoff when retrying an overloaded request