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.
MCP Token Savings via Tool Search
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.