Explore the context window changedcontext-window
Nearest release: v2.1.304, published 6 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 20 Oct 2026 02:34 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 20 Oct 2026 02:37 UTC.
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49
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First seen
14 Aug 2026
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Recorded edits22to this page, all time
The whole hunk
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/
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4949 tokens: 450,
5050 color: '#D4A843',
5151 vis: 'hidden',
52 noSurviveCompact: true,
53 desc: 'One-line descriptions of available skills so Claude knows what it can invoke. Full skill content loads only when Claude actually uses one. Skills with `disable-model-invocation: true` are not in this list. They stay completely out of context until you invoke them with `/name`. Unlike the rest of the startup content, this listing is not re-injected after `/compact`. Only skills you actually invoked get preserved.',
52 desc: 'One-line descriptions of available skills so Claude knows what it can invoke. Full skill content loads only when Claude actually uses one. Skills with `disable-model-invocation: true` are not in this list. They stay completely out of context until you invoke them with `/name`. After compaction, Claude Code re-injects this list.',
5453 link: '/en/skills'
5554 }, {
5655 t: 0.12,
from line 530
531530 };
532531 }
533532 {}
534 const autoLoads = nonCompact.filter(e => e.kind === 'auto' && e.t < STARTUP_END && !e.noSurviveCompact);
533 const autoLoads = nonCompact.filter(e => e.kind === 'auto' && e.t < STARTUP_END);
535534 const restored = nonCompact.filter(e => e.restoredAfterCompact);
536535 const summarized = nonCompact.filter(e => e.t >= STARTUP_END && e.kind !== 'sub');
537536 const sumTokens = summarized.reduce((s, e) => s + e.tokens, 0);
from line 618
619618 if (detailRef.current) detailRef.current.scrollTop = 0;
620619 }, [hovEvent]);
621620 const focusT = hovEvent ? hovEvent.t : time;
622 const takeaway = isCompacted ? 'Compaction replaces the conversation with a structured summary. System prompt, CLAUDE.md, memory, and MCP tools reload automatically. Claude Code also re-reads up to five of the files modified most recently and re-injects the skills you invoked. The skill listing does not reload.' : focusT < STARTUP_END ? 'A lot loads before you type anything. CLAUDE.md, memory, skills, and MCP tools are all in context before your first prompt.' : focusT < 0.28 ? "Your prompt is tiny compared to what's already loaded. Most of Claude's context is project knowledge, not your words." : focusT < 0.50 ? 'Each file Claude reads grows the context. Path-scoped rules load automatically alongside matching files.' : focusT < 0.71 ? 'Hooks fire automatically on tool events. Output reaches Claude via additionalContext JSON. Exit code 2 surfaces stderr to Claude. Plain stdout on exit 0 goes to the debug log, not the transcript.' : focusT < 0.79 ? 'Follow-up questions keep building on the same context. Everything from earlier is still there.' : focusT < 0.87 ? "The subagent works in its own separate context window. None of its file reads touch yours. Only the final summary comes back." : focusT < 0.88 ? 'Bang commands run in your shell and prefix the output to your next message. Useful for grounding Claude in command results without it running them.' : focusT < 0.90 ? 'User-only skills stay out of context entirely until you invoke them. The skill index at startup only lists skills Claude can call on its own.' : '/compact summarizes the conversation to free space while keeping key information. In a real session, run it when context starts affecting performance or before a long new task.';
621 const takeaway = isCompacted ? 'Compaction replaces the conversation with a structured summary. System prompt, CLAUDE.md, memory, skill descriptions, and MCP tools reload automatically. Claude Code also re-reads up to five of the files modified most recently and re-injects the skills you invoked.' : focusT < STARTUP_END ? 'A lot loads before you type anything. CLAUDE.md, memory, skills, and MCP tools are all in context before your first prompt.' : focusT < 0.28 ? "Your prompt is tiny compared to what's already loaded. Most of Claude's context is project knowledge, not your words." : focusT < 0.50 ? 'Each file Claude reads grows the context. Path-scoped rules load automatically alongside matching files.' : focusT < 0.71 ? 'Hooks fire automatically on tool events. Output reaches Claude via additionalContext JSON. Exit code 2 surfaces stderr to Claude. Plain stdout on exit 0 goes to the debug log, not the transcript.' : focusT < 0.79 ? 'Follow-up questions keep building on the same context. Everything from earlier is still there.' : focusT < 0.87 ? "The subagent works in its own separate context window. None of its file reads touch yours. Only the final summary comes back." : focusT < 0.88 ? 'Bang commands run in your shell and prefix the output to your next message. Useful for grounding Claude in command results without it running them.' : focusT < 0.90 ? 'User-only skills stay out of context entirely until you invoke them. The skill index at startup only lists skills Claude can call on its own.' : '/compact summarizes the conversation to free space while keeping key information. In a real session, run it when context starts affecting performance or before a long new task.';
623622 const terminalView = isCompacted ? 'A "Conversation compacted" message, then a one-line "Read auth.ts" for each re-read file and "Skills restored (commit-push)". None of the content itself appears.' : focusT < STARTUP_END ? 'The input box, waiting for your first message. Everything above loads silently before you type anything.' : focusT < 0.28 ? 'Your prompt. Claude hasn\'t started working yet.' : focusT < 0.52 ? 'Your prompt and "Reading files...". Rules show as one-line "Loaded" notices, not their content.' : focusT < 0.72 ? "Claude's response and file diffs. Hooks fire silently. Tool output like npm test shows as a brief summary, not the full content." : focusT < 0.79 ? 'Your follow-up prompt.' : focusT < 0.86 ? "A brief notice that a subagent is working, then its result. You don't see the subagent's individual file reads." : focusT < 0.90 ? "Claude's response, your git status output, and the commit-push skill running." : 'Your full conversation. /compact is available to run.';
624623 const mono = 'var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace)';
625624 const renderWithCode = s => s.split('`').map((part, i) => i % 2 === 1 ? <code key={i} style={{
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946945 lineHeight: 1.5,
947946 marginTop: 4
948947 }}>
949 This is what's left in context: startup content, which lives outside the message history and reloads after compaction, a structured summary of the entire conversation, the files modified most recently, and the body of each skill you invoked. Skill descriptions don't reload.
948 What's left in context: a conversation summary, the most recently modified files, the bodies of invoked skills, and the startup content, skill descriptions included.
950949 </div>
951950 </div>}
952951 {time > 0 && visible.length > 0 && <div style={{
from line 1593
15941593| System prompt and output style | Both still apply |
15951594| Project-root CLAUDE.md and unscoped rules | Re-injected from disk |
15961595| Auto memory | Re-injected from disk |
1596| Skill descriptions | Rebuilt from your current [skills](/docs/en/skills) and re-injected. Requires Claude Code v2.1.304 or later |
15971597| [Git status snapshot](/docs/en/settings-reference#includegitinstructions) | If the session started with one, Claude Code reads a fresh one from your repository |
15981598| The plan Claude wrote in [plan mode](/docs/en/permission-modes#analyze-before-you-edit-with-plan-mode) | Re-injected from disk |
15991599| Rules with `paths:` frontmatter | Claude Code reloads them [on demand](/docs/en/memory#path-specific-rules) |
No line in this hunk matches that.