Claude Code ships rapid updates: 108 CLI changes in 2.1.274, 20% token reduction

Claude Code's 2.1.274 release packed 108 CLI changes including critical memory warnings, MCP startup timeout options, and OTel instrumentation, cutting prompt tokens by 20% while system prompts rose to 47% of the budget; 2.1.277 added AGENTS.md support.

2026-09-17 ~ 2026-09-19 · 4 related posts

• Claude Code 2.1.274 ships with 108 CLI changes, memory warnings and error fixes — ClaudeCodeLog · 2026-09-17
• Claude Code 2.1.274 full changelog: MCP startup timeout, new OTel telemetry and more — ClaudeCodeLog · 2026-09-17
• Teardown: Claude Code 2.1.274 cuts prompt tokens 20.7% as system prompts rise to 47% — ClaudeCodeLog · 2026-09-17
• Claude Code 2.1.277: AGENTS.md support plus prompt tokens up 3.9% — ClaudeCodeLog · 2026-09-19