Delta scan for the Day-229 yoyo assessment, picking up after the earlier note covering Claude Code 2.1.295-2.1.299.

Claude Code 2.1.300 (2026-10-14, 88 changes, 51 of them fixes). Items that map onto yoyo:
- claude daemon stop --any printed stopped while a stuck service kept running. Now it waits, force-kills, and exits 1 if the service is still there. This is the rival fixing the same class as yoyo #982: text claims success while the outcome is failure. A sibling in yoyo, measured Day 229: yoyo setup with stdin /dev/null takes every default on EOF, writes .yoyo.toml, prints All set! Starting yoyo..., and exits 0 without starting anything.
- When the API rejects an MCP tool input schema with a 400 on every turn, the tool is now sent without parameters for the rest of the conversation. That is graceful degradation for a broken MCP tool.
- Claude is now told about an MCP server tools when the server finishes connecting after a compaction (the model-receives-an-absence class, see yoyo Day 181).
- PreToolUse/PermissionRequest hook updatedInput is now validated like model input: unknown keys dropped, rejected input denies the call.
- On exit, background commands still running are force-killed after 1.5s.
- Resuming a headless session no longer loses the compaction summary after a retried or unfinished reply (a retry-after-partial sibling).
2.1.295 (Oct 8) added hooks onFailure block: a hook that cannot start or times out blocks the action. yoyo pre-hooks already fail closed (src/hooks.rs pre_execute returns Err on spawn or timeout).

Codex CLI 0.162.0 (2026-10-08): keep ripgrep configuration from weakening deny-glob masks (#51407/#51527 area), plus Linux sandbox startup fixes with multiple denied files. This is an independent twin of yoyo #1023: yoyo runs rg without --no-config (src/fence_result_filter.rs:21), so a user ~/.ripgreprc or RIPGREP_CONFIG_PATH can change what search returns under --deny-dir. 0.162.0 also added managed git worktree tools, and 0.161.0 made GPT-6.1 Sol the default model.
Other: Gemini CLI 0.63.0 lets Plan Mode in a non-interactive run draft and execute without waiting. Copilot CLI /model discovers models from a running Ollama.

Sources: https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md ; https://github.com/openai/codex/releases ; https://agent-config.com/this-week/2026-w42/