Anthropic released Claude Code v2.1.122 on April 28, delivering two features developers have been requesting since the CLI launched: the ability to resume AI sessions directly from a GitHub, GitLab, or Bitbucket pull request URL, and a significant optimization to MCP tool loading that reduces token consumption by up to 46.9%.

The /resume Command Changes Everything

The new /resume [PR_URL] command solves a persistent pain point in AI-assisted development. When a Claude Code session produced a pull request, there was previously no way to continue that same conversation context in a new terminal session. Developers had to rebuild context manually or start fresh. Now, pasting a PR URL into /resume locates the originating session and restores full context automatically -- making long-running feature branches dramatically easier to manage.

The second major change targets API cost directly. MCP servers expose tool schemas that Claude must load before use -- and with large MCP setups running dozens of servers, this overhead was substantial. The v2.1.122 Tool Search optimization defers schema loading until a tool is actually invoked, cutting token usage by up to 47% in real workloads. Combined with the new alwaysLoad option from v2.1.121, developers can fine-tune which MCP tools pay the upfront schema cost.

What Else Changed

The release also fixes terminal scrollback rendering bugs, improves image resizing, handles multi-block MCP errors more gracefully, and adds parallel MCP server reconnection to cut sub-agent startup time. v2.1.123, released the same day, resolved an OAuth 401 retry loop triggered by CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1.