Claude Code Timing Out? Route Anthropic API & Deps with Clash Rules in 2026

Why Claude Code Needs a Terminal-Specific Mental Model

Claude Code is Anthropic’s agentic coding experience built for the terminal: it streams completions and tool calls against Anthropic API endpoints, pulls packages or binaries through registries, and may phone home to completely different host families than the claude.ai website you open in a browser. In 2026 that pattern matters because many developers still assume “I enabled Clash, so everything works.” In practice, Clash only affects flows that actually traverse the listeners you configured.

Editors such as Cursor IDE concentrate traffic under vendor-controlled domains like *.cursor.sh; our Cursor split-rules guide walks through that toolchain. Claude Code is adjacent but not identical: the hot path is often a bare Node or native binary talking to api.anthropic.com while secondary requests hit npm, GitHub releases, or static CDNs. If you copy a ChatGPT-oriented profile wholesale, you may route OpenAI beautifully while Anthropic traffic still falls through to a harsh GEOIP,CN,DIRECT shortcut—or the opposite, if your defaults send everything through a lossy free node.

The fix is not mysticism. Treat Claude Code as a small portfolio of hostnames you discovered in your own connection log, park them on a dedicated proxy-groups lane ahead of broad regional shortcuts, and reconcile DNS with fake-ip so those DOMAIN-SUFFIX lines actually fire. This article is written for people who already understand MATCH semantics—if the vocabulary feels new, read the rule split guide first, then return here for terminal-specific pitfalls.

Symptoms: When “The Internet Works” Misleads You

Classic failure modes include: claude prints a generic network timeout after auth; the binary checks for updates forever; npm install of @anthropic-ai/claude-code completes but the first API call hangs; OAuth opens in the browser successfully while the CLI never receives a token exchange; or large downloads crawl because half the traffic rides DIRECT through an asymmetric path.

Each symptom maps to a different hostname class. Browser OAuth might only need claude.ai reachable, while the CLI continues to fail on api.anthropic.com because that socket never used the browser’s proxy path. Update channels might point at GitHub or CloudFront-style edges that share IP ranges with unrelated sites, which makes naive IP rules risky. Your split rules should narrate a story that matches the log lines, not a story that matches forum lore from last year.

Another frequent gap is assuming system proxy covers all processes. On macOS and Windows many GUI apps honor the OS setting; shells often do not unless you export variables or wrap them with a proxifier. Until you either inject HTTP_PROXY consistently or enable TUN capture, Clash can be “on” while Claude Code happily opens direct TLS to the wrong uplink. For stack-specific TUN notes, keep the TUN mode guide open while you test.

System Proxy, Environment Variables, or TUN for the Shell

Start with a simple decision tree. If your terminal already shows working proxy variables—often pointed at 127.0.0.1 and Clash’s mixed or HTTP port—Claude Code inherits them like any other CLI tool, and your split rules should behave similarly to other proxied traffic. If not, you can export HTTP_PROXY, HTTPS_PROXY, and ALL_PROXY for the session, or bake them into your shell profile when policy allows.

When a stubborn binary ignores even explicit variables—some updaters and language runtimes do—TUN becomes the honest solution because it captures IP traffic underneath the application’s preferences. That trades convenience for breadth: every packet now crosses Clash, so your DIRECT exceptions for LAN, captive portals, and banking sites must be clean before you celebrate. The point is not “TUN good, split bad.” The point is to match capture depth to the stubbornness of the process.

If you also run Model Context Protocol bridges that fan out to additional vendors, expect overlapping hostnames. Our MCP routing article explains why subprocesses sometimes call api.anthropic.com even when the parent IDE uses a different cloud—keep MCP lanes in mind before you declare victory on Claude Code alone.

Hostname Inventory: Anthropic API and Likely Dependencies

Anthropic’s public documentation and changelogs evolve. Treat the list below as a baseline inventory you verify in your own log after one successful session, not as immutable gospel.

• Core API: api.anthropic.com is the marquee hostname for model inference and many programmatic integrations.
• Corporate surface: anthropic.com and marketing or support subdomains may appear during documentation fetches or status checks.
• Account and web console: claude.ai frequently participates in authentication and account management flows that mirror what you see in a browser.
• Distributions: npm registry hosts such as registry.npmjs.org matter for npm install paths; GitHub (github.com, objects.githubusercontent.com, release assets) shows up when installers pull packaged binaries or checksum manifests.
• Shared CDNs: Update payloads may terminate on large provider edges. Prefer logging the exact Host: header your updater used before writing ultra-broad DOMAIN-KEYWORD shortcuts that will haunt you later.

For overlap with browser-first assistant usage, the ChatGPT and Claude split-rules walkthrough still helps: it explains how vendor APIs differ from simple webpage browsing and why DOMAIN-SUFFIX ordering beats chasing IPs. This page narrows the lens to shell-first workflows where terminal proxy visibility is the bottleneck.

Proxy-Groups: One Lane or Split API versus Dependencies

The minimal pattern defines a single select or url-test group—call it ANTHROPIC—and routes all confirmed Anthropic suffixes there. That mirrors how many teams start with Cursor or ChatGPT lanes before they optimize.

The finer pattern splits ANTHROPIC_API for low-latency streaming calls from DEPS for chunky downloads so you can assign a stable node to chat while letting multi-megabyte artifacts ride a throughput-friendly path. Either approach is valid; the wrong approach is pretending api.anthropic.com and registry.npmjs.org deserve identical failover characteristics when your nodes are a mixed bag of resellers and regions.

Whatever you choose, every name referenced in rules must exist in proxy-groups. Copy-pasting snippets that still say 🚀 节点选择 when your YAML never defined that label produces silent confusion until you read Clash’s own validation output. Rename groups to match your working profile, then diff the file like code.

A Practical Rule Block (Conceptual YAML)

The excerpt below is illustrative. Place Anthropic-specific lines above wide GEOIP or regional direct rules so first-match semantics work for you, not against you. Swap outbound labels to match your config.

# Conceptual excerpt — confirm hostnames in your connection log
proxy-groups:
  - name: ANTHROPIC_API
    type: select
    proxies:
      - NODE-A
      - NODE-B
      - DIRECT
  - name: DEPS
    type: select
    proxies:
      - NODE-B
      - NODE-A
      - DIRECT

rules:
  - DOMAIN-SUFFIX,anthropic.com,ANTHROPIC_API
  - DOMAIN-SUFFIX,api.anthropic.com,ANTHROPIC_API
  - DOMAIN-SUFFIX,claude.ai,ANTHROPIC_API
  - DOMAIN-SUFFIX,npmjs.org,DEPS
  - DOMAIN-SUFFIX,npmjs.com,DEPS
  - DOMAIN-SUFFIX,github.com,DEPS
  - DOMAIN-SUFFIX,githubusercontent.com,DEPS
  # Append observability or shard hosts your log reveals — avoid unfounded keywords
  # ... GEOIP / MATCH follow ...

If you collapse to one group, point every line at ANTHROPIC instead. The non-negotiable discipline is ordering: Claude-specific exceptions must precede catch-all buckets that think they know what “foreign” means better than your trace.

Rule Order, GEOIP, and Shared Infrastructure Traps

The classic footgun is GEOIP,XX,DIRECT above vendor exceptions. Geolocation databases are helpful and imperfect; anycast addresses can tunnel traffic in ways that defeat intuition. When a broad domestic shortcut wins first, you stare at your nodes wondering why “Latency looks fine” while the CLI still times out. Move Anthropic lines up until the log shows the outbound you expect.

Shared CDN domains are the second trap. A rule for a huge cloud front door may drag unrelated tooling onto an expensive path—or accidentally bypass optimization you relied on for IDE traffic. When possible, tighten from suffix to exact DOMAIN entries after you read the failing hostname once in the dashboard.

Finally, watch for contradictory duplicates after merging community providers with personal overrides. Two sources quietly disagree; first match wins; you lose an afternoon. Scan for repeated suffixes whenever you integrate a new subscription fragment.

DNS, Fake-IP, and Why Resolver Bypass Breaks DOMAIN Rules

Clash observes names through the resolver path you gave it. Fake-ip modes synthesize short answers so the rule engine can recover domain intent from subsequent connections—until some other stack resolves the same name outside Clash. Operating-system DoH, browser-only DNS, corporate VPN DNS, or a language runtime that hardcodes resolvers can all desynchronize what you think your YAML says from what actually matches.

The failure looks like cryptographic success in packet captures yet bizarre GEOIP hits in your log. Fix resolver alignment before you rip out half your subscription. That often means turning down competing secure DNS on the OS, pointing tools at Clash’s DNS listener, and validating that TUN includes DNS capture when you rely on it.

Streaming APIs tolerate latency poorly. Long completions sit on warm HTTP connections; a marginal node manifests as “the model went quiet” rather than a neat TLS alert label. If you run url-test groups for Anthropic lanes, prefer conservative intervals and probes that reflect HTTPS reality—hyperactive failover that flaps on every transient jitter is worse than a steady mediocre node for interactive coding.

Verification: Reproduce, Log, Then Tune

Use a repeatable micro-checklist after each change:

1. Open your Clash connection or debug pane and filter on anthropic and claude substrings so noise drops away.
2. From the same shell you use for Claude Code, run a short TLS probe such as curl -I https://api.anthropic.com and confirm whether the flow lands on ANTHROPIC_API or an unexpected outbound.
3. Trigger a minimal Claude Code action that previously failed—an auth ping, a single prompt, or a version check—and read the new log lines immediately.
4. If OAuth is involved, complete the browser step once and verify whether token exchange hostnames differ from the API host; append those suffixes deliberately.
5. Document the working trio: core version, DNS mode, and the exact group names you routed. Paste that note beside your YAML so the next upgrade does not erase tribal knowledge.

When you need baseline vocabulary on group types beyond Anthropic-specific tuning, revisit the routing deep dive before you chase exotic protocols.

What “Stable” Means Under Rate Limits and Real Networks

Routing cannot invent capacity. Subscriptions expire, regions brown out, and vendor-side rate limits still apply even when your YAML is perfect. Stability is the combination of honest outbound health, sane MATCH defaults, DNS that tells one consistent story, and expectations that match how streaming clients behave.

Compared with one-off browser extensions, keeping Anthropic CLI traffic inside a maintained Mihomo-family profile means Claude Code rides the same observability and iteration loop as the rest of your network policy—precisely where it belongs if agentic coding is daily work rather than a weekend experiment.

FAQ

The browser works, but Claude Code still times out. Why?

Browsers and shells rarely share identical networking stacks. The browser might use OS proxy settings or its own secure DNS, while the CLI opens direct sockets. Until you align proxy variables or enable TUN, Clash may never see those flows, which means your carefully written split rules never execute for Claude Code even when they work for Safari or Chrome.

Is listing only api.anthropic.com sufficient?

Often it is the main piece for model traffic, but installs, OAuth, telemetry, and static assets may introduce additional hosts. Let your log be the authority: reproduce once, read the host column, then add suffixes with comments that explain why they exist.

Should I switch to GLOBAL mode to “just make it work”?

Global modes and careless TUN can hide DNS bugs and break domestic services you still need. Prefer explicit Anthropic and dependency lanes first. Escalate capture breadth only when a specific process refuses respectful proxy settings and you have cleaned up exceptions for sensitive traffic.

Is this the same setup as Cursor IDE?

No. Cursor’s first-party surface skews toward *.cursor.sh and editor marketplace CDNs. Claude Code skews toward Anthropic endpoints and shell-native dependency fetches. You can run both tools; give each its own rule cluster to avoid ambiguous merges that make regressions hard to bisect.

Closing Thoughts

In 2026, Claude Code is a sharp reminder that AI tooling migrated out of tabs and into terminals. Clash shines when you stop treating that migration as a footnote. Put Anthropic API traffic and its dependency neighbors on policy paths you can name, keep GEOIP shortcuts from stealing first-match wins, and align DNS with your fake-ip story so domain rules stay honest.

Many lightweight helpers stop at flipping a single switch: they either tunnel everything—creating breakage elsewhere—or repeat outdated hostname lists that rotted months ago. A maintained rule set with log-backed edits scales better for teams who depend on agentic shells during real deadlines.

ClashSource focuses on reproducible policy: clear split lanes, Mihomo-friendly examples, and guidance that still makes sense after the next vendor rename. If you want a client build tuned for that workflow instead of hand-rolled YAML archaeology, you can download ClashSource for free and apply the same Anthropic-oriented blocks without reinventing infrastructure from scratch.