Claude Code v2.1.267 Update: Global Effort Control and Prompt Cache Optimization Explained

Claude Code v2.1.267 delivers several important updates, with a core focus on performance control, cache optimization, and cross-platform experience improvements. This article breaks down how these new features help developers boost productivity.

Core Feature Upgrades

Global Effort Level Configuration

The maxEffortLevel configuration introduced in v2.1.267 is a significant breakthrough in performance control. Developers can now set a maximum effort level at the top-level config or for specific models, and this setting applies across all API providers — Bedrock, Vertex, and Foundry.

The practical value of this feature includes:

• Fine-grained control over model inference costs
• Optimized response speed
• Finding the ideal balance between quality and cost
• Dynamic adjustment support — users can choose a lower level, but cannot exceed the configured ceiling

System Prompt Snapshot Mode

The new --system-prompt-snapshot off parameter addresses the inefficiency of prompt iteration. When enabled, the system re-renders prompt content on every request rather than reusing cached history. This is especially valuable for scenarios that require frequent testing of different prompt strategies — developers can validate changes in real time without restarting a session.

Prompt Cache Optimization

Improved Cache Hit Rates

This update includes a comprehensive overhaul of the prompt cache, resolving multiple issues that caused cache invalidation:

Key scenarios fixed:

• Switching models with the /model command no longer re-sends tool definitions
• Tool list cache is preserved after MCP server reconnections
• Tool descriptions are no longer re-rendered when restoring a session
• Storage logic for sub-agents and custom system prompts has been optimized

Performance impact:

• Significantly reduced API call costs
• Faster response times
• Noticeable gains in long-running sessions
• Standout performance advantages when tools are called frequently

Cross-Platform Experience Improvements

VS Code Extension Stability

VS Code users will enjoy a smoother development experience:

• Performance fix: Resolved 100% CPU usage caused by the extension host processing circular parent links
• WSL2 support: Improved screenshot paste functionality in Windows Subsystem for Linux environments
• Editor fix: Fixed acceptance of edits in diff views for files with CRLF line endings
• Process management: Optimized ripgrep process scheduling in large workspaces

Claude Code Web Improvements

GitHub integration in the web version has been comprehensively strengthened:

• Fixed false account disconnection errors caused by token expiration in GitHub Enterprise Server sessions
• Improved gh command handling for organizations without Claude GitHub App authorization
• Improved API call error handling logic
• Enhanced accuracy of error messages when usage limits are exhausted

Collaboration and Workflow Enhancements

Remote Control Stability

The Remote Control feature received two critical fixes:

1. Permission mode display: Resolved the issue where clients joining a session would see stale permission modes
2. Credential auto-renewal: Fixed a bug where expired server credentials (approximately 30 days) caused the host to exit and disconnect the session — it now supports automatic re-registration while maintaining the connection

Cowork and Workflow Improvements

• Sandbox compatibility: Fixed cloud Cowork scheduled tasks failing to start under organization settings that require a sandbox
• Auto mode support: Resolved agent() calls in Workflows being rejected when running in auto mode
• Error messaging: Artifact tool publish failures now provide clear explanations and suggested solutions

UX Polish

v2.1.267 also includes a range of detail-level improvements:

• Interface smoothness: Improved /diff panel loading experience, eliminating flickering and empty state flashes
• Command descriptions: Optimized Bash tool descriptions so Claude explains command functionality in plain language
• Input responsiveness: Improved prompt input response speed and resolved key input lag
• Mobile support: Fixed blank rendering of /context output on mobile devices
• Error messaging: Improved error prompts when clipboard commands fail in sandbox environments

These improvements reflect the development team's ongoing commitment to user experience — from performance optimization to interaction details, every aspect continues to be refined. Whether you're a solo developer or working in a team setting, v2.1.267 delivers real, tangible efficiency gains.