Claude Code v2.1.122 adds Bedrock service tier selection and improves MCP server handling

Anthropic published version 2.1.122 of Claude Code on April 28, with updates targeting infrastructure configuration and bug resolution. The release introduces an environment variable for specifying AWS Bedrock service tiers—default, flex, or priority—transmitted as an HTTP header, allowing users to optimize cost and latency tradeoffs.

The update extends session discovery capabilities by enabling PR URL search across multiple version control platforms. Users can now paste a pull request URL into the /resume search feature to locate the original Claude Code session that created it, functioning across GitHub, GitHub Enterprise, GitLab, and Bitbucket.

The release resolves a critical issue in the /branch command that caused fork generation failures when the source session contained entries from rewound timelines, manifesting as missing tool_use ID blocks. Additional fixes address Vertex AI token counting failures for proxied users, incorrect image resizing for newer models (2576px instead of 2000px), and unresponsive Caps Lock keybinding detection in voice mode.

OpenTelemetry logging received improvements to emit numeric attributes as actual numbers rather than strings, and MCP server connector deduplication now provides hints when duplicate connections are detected.