Extend Claude Code changedfeatures-overview
Nearest release: v2.1.302, published 3 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 16 Oct 2026 20:20 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 16 Oct 2026 20:37 UTC.
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174174 | - | - | - |
175175 | **Runs** | A shell command, HTTP request, MCP tool call, LLM prompt, or subagent | Instructions Claude reads and follows |
176176 | **Triggered by** | [Lifecycle events](/docs/en/hooks#hook-events) such as `PostToolUse` or `SessionStart` | You typing `/<name>`, or Claude matching the description to your task |
177 | **Determinism** | Always fires on its event; the trigger is guaranteed | Claude interprets the instructions; outcome can vary |
177 | **Determinism** | Fires on its event without Claude deciding | Claude interprets the instructions; outcome can vary |
178178 | **Context cost** | Zero unless the hook returns output | Description loads each session; full content loads when used |
179179 | **Best for** | Linting after edits, blocking unsafe commands, logging, notifications | Workflows that need reasoning, reference material, multi-step tasks |
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