Claude Code v2.1.300 Release - Mode Feature Enhancements and Stability Improvements

Claude Code released v2.1.300. Mode (mod) features now include virtualText prompt decorations, $.ui.view() agent view control, and right-to-left text support. T

Claude Code · Release v2.1.300 · 2026-10-14

Claude Code released v2.1.300. Mode (mod) features now include virtualText prompt decorations, $.ui.view() agent view control, and right-to-left text support. The /advisor command was introduced to the AWS-based Claude Platform, and GenAI standard attributes were added to OpenTelemetry. Numerous bugs were fixed, including cloud session network configuration errors, agent resume issues, and diff view conflict detection.

weltiq perspective: For weltiq users leveraging Claude Code for trading strategy development and backtesting automation, expanded mode customization options and improved session stability enhance workflow reliability.

Release Notes Excerpt

What's changed Added virtualText to a mod's prompt decorations: text drawn in the prompt box that never enters the draft or the submitted prompt Added cache_creation_5m_tokens and cache_creation_1h_tokens to the OpenTelemetry api_request event, splitting cache writes by lifetime Added $.ui.view({ agentId }) for mods: shows an agent's transcript in the main view when you ask, and $.ui.view({}) goes back Added a dir prop on a mod's Text for right-to-left text: on Windows and in VS Code's terminal its rows read in that direction and sit flush right Added /advisor on Claude Platform on AWS; no advisor runs until you pick one with /advisor , advisorModel or --advisor , and CLAUDE_CODE_DISABLE_ADV…

Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.300