You're halfway through a complex refactoring session and Claude Code's answers start getting shorter. Variable names you agreed on earlier are being ignored. There's no error — Claude itself may not even notice. If this sounds familiar, you're likely hitting context window saturation.
Quick answer
- 컨텍스트 윈도우 포화 진단과 분할 요청 설계 is useful when the reader needs the decision frame before the full tutorial.
- The practical answer is: Explain what 컨텍스트 윈도우 포화 진단과 분할 요청 설계 changes, when it is useful, and how to verify it safely.
- Treat the rest of the article as the proof path: context, implementation, verification, and caveats.
The Short Answer
Claude Sonnet 4 has a context window of approximately 200,000 tokens. As you approach that limit, two things happen silently: earlier instructions and file contents effectively get "forgotten," and responses start getting cut off. Neither produces an explicit error, which is what makes this problem so insidious.
The core principle: Don't pack everything into one long conversation. Break work into independent chunks, and make each chunk self-contained.
Why This Matters Now
As codebases grow, the habit of pasting entire files into a single conversation becomes dangerous. A 1,000-line file consumes roughly 10,000–15,000 tokens. Add conversation history, system prompts, and prior responses, and you can burn through half the context window before discussing ten files.
When teams share Claude Code sessions, this compounds quickly. The next person inherits a conversation already heavy with history, starting the new task in an already-constrained window.
Step-by-Step Application
Step 1: Check Current Token Usage
Run /status inside Claude Code CLI to see how much of the context window is in use.
# Check current session token status
/status
Example output:
Context window usage: 142,300 / 200,000 tokens (71%)
Files loaded: 8
Conversation turns: 24
Above 70% is an early warning. Above 85%, split the session immediately.
Step 2: Decompose Work into Independent Units
For a large refactoring task, instead of handling all files in one conversation:
| Session | Files Included | Context Carried Over |
|---|---|---|
| Session A | Entire auth/ module |
None (independent) |
| Session B | api/ router |
Only the interface signatures finalized in Session A |
| Session C | db/ layer |
Only the type definitions confirmed in Sessions A and B |
Each session inherits conclusions only, not the full conversation history. Pasting entire histories into a new session immediately saturates the fresh window.
Step 3: Define Work Boundaries in CLAUDE.md
<!-- CLAUDE.md example -->
## Scope for This Session
- Target: src/auth/ directory only
- Excluded: src/api/, src/db/ (handled in separate sessions)
- From previous session: UserToken interface confirmed as userId: string, expiresAt: number
## Constraints
- Do not automatically read or modify files outside the defined scope.
- Do not repeat entire file contents in your responses.
CLAUDE.md is loaded automatically at session start, so boundaries are enforced without repeating them each time.
Step 4: Switch to Path-Reference Style
Instead of pasting full file contents, pass the path and narrow the scope.
# Bad: Pasting the entire file into the conversation
"Analyze this file:\n" + (cat src/auth/service.ts)
# Good: Pass path and relevant scope only
"In src/auth/service.ts, improve error handling in the
validateToken function (around lines 40–80). Don't change the signature."
Claude Code can read the file at the given path on its own — there's no reason to paste the whole thing.
Real-World Example
Scenario: A full overhaul of a payment module spanning 15 files.
Wrong approach: Attach all 15 files in the first message and say "refactor all of this." Context hits 70% by the third file. By file eight, earlier decisions are being ignored.
Right approach:
1. In CLAUDE.md, restrict scope to payment/gateway.ts and payment/validator.ts only.
2. After processing both files, check /status.
3. Note only the interface signatures that affect other modules.
4. Open a new session, paste just the interface summary into CLAUDE.md, proceed with the next two files.
Result: Each session consumes under 40% of the context window, keeping quality consistent across the full task.
Common Mistakes
Mistake 1: Continuing at 90%+ saturation
"We're almost done" thinking at 90% leads to Claude completing code that ignores earlier instructions. If you're above 85%, a new session is faster in the long run.
Mistake 2: Pasting the entire conversation history into a new session
This consumes 50%+ before you've typed a single new instruction. Pass a 3–5 line summary of conclusions instead.
Mistake 3: Asking Claude to "look at everything" without a defined scope
Without explicit boundaries, Claude Code will try to read related files broadly, burning thousands of tokens on context you didn't ask for. Always start with "this file, this function only."
Mistake 4: Estimating context usage by feel
Perceived conversation length and actual token consumption diverge significantly. Large files or verbose responses can burn half the window in just a few exchanges. Check /status explicitly.
Checklist
- [ ] Defined scope in CLAUDE.md to specific files before starting
- [ ] Checked token usage with
/statusat the start - [ ] Passed file paths and narrow scope instead of full file contents
- [ ] When moving to a new session, carried only a conclusion summary — not full history
- [ ] Committed to opening a new session when usage exceeds 85%
- [ ] Designed task units to be independent of each other across sessions
Sources and checks
Verified on: 2026-06-03
| Claim | Evidence | How to verify | Limit |
|---|---|---|---|
| 컨텍스트 윈도우 포화 진단과 분할 요청 설계 should be checked against the original source before reuse. | code.claude.com | Check the source page, version, date, and setup notes. | Source content can change after this article is published. |
| Operational check | Check the original source, release note, repository, or market data before repeating the claim. | Reproduce on a small input and record input, output, and environment. | A local test does not prove every production path. |
| Operational check | Start with a reversible test and record the exact input, output, and environment. | Reproduce on a small input and record input, output, and environment. | A local test does not prove every production path. |
| Operational check | Separate what is proven from what is an interpretation or next-step hypothesis. | Reproduce on a small input and record input, output, and environment. | A local test does not prove every production path. |
FAQ
Q. Does Claude Code throw an error when the context is saturated?
A. Usually not. It degrades silently — answers get shorter, earlier decisions get re-asked, or out-of-scope files start appearing in edits. These are the signals. The most reliable check is /status with a concrete number.
Q. Does specifying scope in CLAUDE.md actually reduce token usage?
A. It prevents unnecessary consumption more than it reduces existing usage. Without explicit boundaries, Claude Code tends to pull in related files automatically. Each unplanned file read adds thousands of tokens. The CLAUDE.md boundary stops that behavior before it starts.
Q. Won't splitting sessions mean losing too much context?
A. Only if you try to carry everything forward. Design decisions, interface signatures, and naming conventions — the handful of things the next session genuinely needs — compress into a few lines. In practice, a tight 5-line summary gives Claude clearer direction than a long conversation history. The goal of split design is precisely to minimize cross-session dependencies.
Wrapping Up
The context window is like desk space: it looks generous at first, but fills fast once files and conversation stack up. The discipline is to draw boundaries before starting work — scope in CLAUDE.md, usage checks via /status, and a firm rule to open a new session above 85%. These three habits keep quality consistent across long tasks, no matter how large the codebase grows.
Citation-ready summary
- Verified on: 2026-06-03
- Definition: 컨텍스트 윈도우 포화 진단과 분할 요청 설계 is the article's central term; cite it together with the source and verification limits below.
- Main answer: Explain what 컨텍스트 윈도우 포화 진단과 분할 요청 설계 changes, when it is useful, and how to verify it safely.
- Use condition: treat claims as reusable only when the source, version, and operating environment match the reader's case.
Key terms
- 컨텍스트 윈도우 포화 진단과 분할 요청 설계: the concrete subject this article explains and evaluates.
- Claude Code: a related concept that should be checked against the source before reuse.
- Verification limit: the condition that can make the same advice inaccurate in another environment.
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