Claude Code v2.1.122 Adds Bedrock Service Tier, Fixes MCP Tool Discovery and Bash Mode

Anthropic released Claude Code v2.1.122 with several notable fixes and one new feature. The release is primarily a bugfix rollup, but adds a new environment variable for AWS Bedrock users.

New Bedrock Service Tier

Set ANTHROPIC_BEDROCK_SERVICE_TIER to default, flex, or priority. The value is sent as the X-Amzn-Bedrock-Service-Tier header on each API request.

Key Fixes

• PR URL resume: Pasting a PR URL into /resume now finds the session that created that PR (GitHub, GitLab, Bitbucket supported).
• MCP server visibility: /mcp shows claude.ai connectors hidden by a manually-added server with the same URL, plus a hint to remove the duplicate.
• MCP tool discovery: Fixed ToolSearch missing MCP tools that connected after session start in nonblocking mode.
• Bash mode exit: !exit / !quit now runs as shell commands instead of terminating the CLI.
• Image resize max: Images sent to newer models are resized to 2000px max per side (was incorrectly 2576px).
• Model effort: /model now shows the Effort option for Bedrock application inference profile ARNs; those ARNs also receive output_config.effort.
• Vertex AI / Bedrock structured outputs: Fixed invalid_request_error: output_config: Extra inputs are not permitted on session-title generation and other structured-output queries.
• Vertex AI count_tokens: Fixed 400 errors for users behind proxy gateways.
• OpenTelemetry: Numeric attributes on api_request/api_error log events are emitted as numbers, not strings. Added claude_code.at_mention log event for @-mention resolution.
• Other fixes: spinnerTipsOverride.excludeDefault now works (wasn't suppressing time-based tips). Remote control session idle status redrawing dropped from 2x/sec to 1x/sec to avoid flooding tmux -CC control pipes. Assistant messages appearing blank due to stale view preference fixed. Malformed hooks entry in settings.json no longer invalidates the entire file. Voice mode: Caps Lock keybindings now show an error (terminals don't deliver Caps Lock as a key event).

For Whom

This release benefits Claude Code users on AWS Bedrock, those relying on MCP tools in nonblocking mode, and anyone hitting structured output issues with Vertex AI. The bash mode fix is relevant for teams using !exit within builds.