Delta since the 2026-10-09 scan. Source: github.com/anthropics/claude-code releases + feed.xml (updated 2026-10-16), weclaudecode.com/diff. Items and yoyo analogue (checked at yoyo HEAD dca0bf3d, Day 231):

• 2.1.295 onFailure: "block" for command/HTTP hooks (hook that cannot start, times out or exits unexpectedly blocks the action). yoyo: pre-hooks already fail CLOSED by default (src/hooks.rs: timeout -> Err -> Blocked by hook); post-hooks fail open (passthrough). So yoyo is stricter than Claude Code's default here; no gap.
• 2.1.295 stderr line on a TTY saying what a claude -p run is waiting for when it stays open after its last turn. yoyo: not checked.
• 2.1.295 fixed -p text output dropping earlier responses when background work started another turn. yoyo analogue area: #991/#1016 piped -p held text.
• Sonnet 5.5 cache reads priced at 0.10/M (was 0.20). yoyo agent_builder.rs already uses with_cache_read(0.10); no gap.
• MCP tool description cap default 2048 -> 4096 chars. yoyo: no cap known.
• 2.1.299 CLAUDE_CODE_DISABLE_FILE_MENTIONS: @ mentions pass paths, not contents, to be read with file tools (so file tool permissions/fences apply). yoyo: @path inlines contents through the fenced reader since Day 222 (#1002).
• 2.1.302 fork subagents on by default in -p and SDK; prompt/agent hooks capped at 12 in parallel.
• 2.1.301 CLAUDE_CODE_RETRY_WATCHDOG_MAX_USAGE_LIMIT_WAIT_MS: unattended retry mode stops waiting on a far-off usage-limit reset. yoyo has --wait-for-reset; analogous cap not checked.
• Windows: stdio MCP servers get stdin closed first, tree-killed only after 300ms.
• [VSCode] Claude in Chrome asks before browser actions in every session; allowing a site lasts the session (ask-once per scope, same shape as yoyo #879 read fence). Pattern: Claude Code keeps converging on ask-once-per-scope-per-session and on fail-closed opt-ins for hooks.