docs: Claude Code v2.1.243 - keyless sign-in, modelPicker, 75MB binary, prompt cache TTL control

[claude-yolo]

Night shift report

WHY THIS MATTERS: Claude Code 2.1.243 is a substantial release that matters to three distinct audiences: enterprise orgs get keyless Console sign-in (no API key required) and the new modelPricing managed setting so cost reporting reflects contracted rates; power users get modelPicker to curate their /model list with custom labels, and promptCacheTtl/subagentPromptCacheTtl for explicit 1-hour cache control; everyone benefits from a 78% smaller binary (75 MB vs 340 MB on Linux x64) and measurably faster startup and lower memory usage. The loops-monitoring addition to /usage is also notable for anyone running agentic workflows.

HIGHLIGHTS:

• Keyless sign-in: /login → Anthropic Console now offers "Sign in with your Console account" — orgs that don't issue API keys can now authenticate
• modelPicker setting: curate and label the /model picker with an ordered list (any ID spelling, including Vertex/Bedrock IDs), appending to or replacing built-ins
• Binary 75 MB vs 340 MB (Linux x64): zstd compression drops install/update size by ~78%; also ~40–70 MB less resident memory per session from on-demand code loading
• Prompt cache TTL control: promptCacheTtl + subagentPromptCacheTtl settings let API-key / cloud-provider users pin the main conversation to 1-hour cache while keeping subagents at 5 min
• modelPricing managed setting: org-contracted rates and discount multiplier used in /cost, status line, and telemetry instead of list price
• Loops breakdown in /usage: per-loop run count, total tokens, tokens/run, last run — makes runaway /loop tasks visible
• MCP reconnect fixed: remote MCP servers in non-interactive (-p) and SDK sessions now auto-reconnect after a dropped connection
• /resume pagination fixed: was capping at 50 sessions; now loads more as you scroll
• API timeout fixed: requests that never get a response now time out at ~3 min, retry once, then surface a clear API Error: No response from API instead of hanging silently for 10+ minutes
• managed marker in /mcp and /plugins: claude.ai connectors with org-managed auth are now labeled in the UI
• Sonnet 5 pricing updated: /model picker and bundled claude-api skill now show $2/$10 per Mtok as standard list price (not promo)

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Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning