Claude Code CLI Timeouts? Route Anthropic and npm Domains in Clash: Proven Steps 2026

1. Why This Is Not the Same Problem as “Claude Web Won’t Load”

The Claude ecosystem now spans a consumer web app, subscriptions, OAuth surfaces, and Claude Code-style tooling that behaves like infrastructure: persistent HTTPS sessions to AI endpoints, chunked uploads, retries, and—critically—package installation steps that reuse the exact same networking stack your team already uses for day-to-day development. Geo messaging and account-region limits still matter, but the operational question in a terminal workflow is often throughput and consistency: all long-lived requests to Anthropic API hosts should see the same outbound characteristics as npm install, or you risk subtle races where authentication succeeded on one path while dependency resolution starved on another.

Readers who followed our Claude region and DNS article already know that fake-ip misalignment can make DOMAIN rules appear to “do nothing.” The same class of bug shows up here, except the evidence is not only a blank marketing page—it is a stuck spinner in the terminal, a failed model round-trip, or an ETIMEDOUT from registry.npmjs.org that vanishes when you bypass Clash entirely. Treating Claude Code as “just another Anthropic customer” without naming npm and git hosts is how teams burn an afternoon swapping nodes when two YAML rows and a resolver fix would have sufficed.

Throughout, assume Clash Meta (mihomo) with a GUI that exposes live connections and DNS logs. If you cannot see which hostname timed out, you are debugging superstition, not engineering.

2. Symptoms: API Timeouts Beside Slow or Stuck npm

Real-world reports rarely arrive as a single stack trace. More often, you see Anthropic API calls that succeed intermittently while the same machine struggles to finish a modest npm ci; or the opposite—packages install quickly, but every model request eventually fails with a client-side timeout after tens of seconds. Those patterns strongly suggest split routing: two different policy decisions for two different destinations, or the same destination resolved twice through different DNS pipelines.

Another common story is “works in the IDE’s embedded terminal, fails in iTerm,” which may mean one shell inherited HTTP_PROXY while the other did not, or one session used IPv6-capable resolver settings and the other did not. Before you conclude the Anthropic API is down, reproduce once with logging enabled and write down the exact hostnames that appear during failure. If the core log shows alternating outbounds for the same suffix, your Clash profile is still inconsistent—not the model.

Finally, distinguish policy problems from entitlement problems. Billing, organization allowlists, and model availability still apply. This article removes self-inflicted networking noise from developer tools sessions; it does not bypass terms of service or provider restrictions.

3. Hostnames to Capture in Logs (Anthropic, npm, GitHub)

Treat the following as a starting inventory you refine with evidence, not a permanent allowlist carved in stone. Anthropic production API traffic typically includes hostnames under anthropic.com and api.anthropic.com; console, documentation, or OAuth flows may touch additional subdomains. Your Claude Code build might also reach claude.ai-related hosts for account integration—capture them from your own client log during a single failing run rather than guessing from blog posts.

On the package side, the public npm registry is commonly registry.npmjs.org, but tarball downloads may come from CDNs with different suffixes; again, read the log line that accompanied the stall. Monorepos frequently pull git dependencies from github.com and binary assets from objects.githubusercontent.com. If you only route registry.npmjs.org but leave GitHub on a congested DIRECT path, you can still observe “npm is broken” when the registry metadata was fast and the git fetch was not.

Avoid blunt DOMAIN-KEYWORD shortcuts that silently drag unrelated traffic into one group unless you truly intend that blast radius and have measured the collateral. Prefer suffix rules you verified, widen deliberately, and keep a short note in your repo’s internal runbook so the next teammate does not revert your fix during a subscription refresh.

4. One Policy Group for the Whole Coding Session

Create a dedicated select or url-test entry—call it something honest like “Anthropic+Dev”—that front-loads proxies you trust for both low latency and TLS stability toward US or EU hubs, depending on where your Anthropic API calls are expected to land. Interactive coding punishes constant node hopping: a url-test group that flaps every minute can make long HTTP/2 streams look flaky even when the distant service is fine. Many teams pair a primary low-latency member with a fallback tail; the exact pattern overlaps with our url-test and failover article, but the health-check URL should reflect an endpoint you care about, not a random home page that returns 200 from a CDN unrelated to Anthropic.

The point of naming this group narrowly is observability: when something regresses after a subscription update, you search logs for “Anthropic+Dev” and immediately see whether your Claude Code session and your npm registry traffic still share that bucket. If half the flows fell back to DIRECT because a broader GEOIP line won first, you fix ordering—not credentials.

If you import community rule providers, merge your developer overrides into a file you actually read. Duplicate or contradictory rows across merged profiles are how you get “npm works on Monday, fails on Tuesday” with no upstream change.

5. Example YAML: Anthropic + npm Rule Block

The snippet below is illustrative. Replace proxy group names and extend domains using your own mihomo logs. Insert these rules before broad GEOIP shortcuts, consistent with our routing and rules reference.

proxy-groups:
  - name: 🧠 Anthropic+Dev
    type: select
    proxies:
      - US-Dev-01
      - US-Dev-02
      - DIRECT

rules:
  - DOMAIN-SUFFIX,anthropic.com,🧠 Anthropic+Dev
  - DOMAIN-SUFFIX,claude.ai,🧠 Anthropic+Dev
  - DOMAIN-SUFFIX,registry.npmjs.org,🧠 Anthropic+Dev
  - DOMAIN-SUFFIX,npmjs.org,🧠 Anthropic+Dev
  - DOMAIN-SUFFIX,github.com,🧠 Anthropic+Dev
  - DOMAIN-SUFFIX,githubusercontent.com,🧠 Anthropic+Dev
  # Confirm additional hosts (API subdomains, tarball CDNs) from your own trace
  # ... GEOIP and MATCH follow ...

6. Rule Order: Before GEOIP, Before Lazy MATCH

Rule order is the silent killer in every Clash profile. If a regional GEOIP line or a leftover MATCH shortcut wins before your DOMAIN-SUFFIX,registry.npmjs.org row, you will stare at perfectly written rules that never execute. The fix is procedural: promote explicit developer and Anthropic API suffixes above broad geography shortcuts, then re-test. The same discipline appears in every serious mihomo cookbook; what changes here is the concrete set of SaaS plus registry names on your laptop.

When you introduce new merges from a subscription provider, diff the incoming file and look for freshly inserted GEOIP or DOMAIN-KEYWORD rows that might have landed above your personal overrides depending on merge order. “It broke right after I updated the sub” is often merge order, not node quality.

If you rely on a sniffer to recover hostnames from TLSClientHello for IP-first flows, reconcile those notes with your DNS mode. Our HTTPS SNI sniffer guide walks through interpreting mihomo logs when connections arrive before a domain-shaped rule would otherwise match.

7. DNS, Fake-IP, and “Rules Look Correct but Never Match”

No Clash routing article is complete without DNS. Under fake-ip, the client stack may resolve names to synthetic addresses from the tunnel’s pool locally; your DOMAIN-SUFFIX rows still work when the pipeline is coherent, but if the operating system or a container bypasses the core’s resolver, you will see split behaviour between “host npm on macOS” and “npm inside Docker.” Align everything: trusted upstream DNS in mihomo, consistent enhanced-mode semantics, and no silent fallback to ISP resolvers “just for speed.”

When symptoms look like resolver schizophrenia—some tools resolve through the tunnel and others hit public DNS directly—pause and read fake-ip versus redir-host in Clash Meta. Choosing the wrong DNS mode for your workload can mimic arbitrary timeout bugs that no proxy node will fix.

On Windows, remember browser “secure DNS” and OS-level overrides can coexist with your profile in ways that confuse first-time tuners; the general pattern is documented in our Chrome and Edge secure DNS note, and the lesson transfers: one resolver story per machine, not three competing ones.

8. Terminal Proxy: Shell env, Node, and Split Paths

Terminal proxy configuration is where “I set HTTPS_PROXY once” meets reality. Node-based tools may respect HTTP(S)_PROXY, honor NO_PROXY for corporate hosts, or ignore everything if a dependency spawns its own HTTP client with custom agents. Meanwhile, Clash system proxy or TUN mode can steer traffic without per-shell variables—if—and only if—those packets actually enter the tunnel and DNS stays aligned. Mixed mode—TUN on, but npm also configured with a stale proxy port—is a frequent source of duplicate or diverging paths.

If you standardize on environment variables for npm registry traffic, pair that document with your mihomo group name so every engineer sets the same combination. Our Windows npm and pnpm proxy split-rules article covers several failure shapes that overlap with AI CLI workflows—especially split tunnels where only one of HTTP and HTTPS was forwarded.

For child processes spawned by assistants or language servers, remember the executable might not be the one you proxied interactively. When in doubt, prefer a single coherent capture strategy—usually TUN with verified DNS—and then simplify environment overrides instead of multiplying them.

9. How This Slides Next to Cursor and MCP Guides

We already publish narrowly scoped pieces for adjacent stacks so readers are not forced to read one mega-post. Our Cursor IDE routing guide focuses on Electron-sized complexity and marketplace CDNs; MCP tooling and npm/GitHub stabilization focuses on Model Context Protocol server installs. This Claude Code article foregrounds Anthropic API naming and terminal-native failure modes—different primary keyword intent, overlapping infrastructure. Reuse YAML patterns, but do not merge the narratives: copy the discipline, not every hostname list.

If your team standardizes on a single “AI+dev” outbound for several products, consolidate intentionally and document which commercial terms apply to which traffic. Operational clarity beats a hundred clever one-off rules nobody can audit during an incident.

10. Verification Checklist

After subscription refreshes, client upgrades, or mysterious Tuesday-only failures, walk this list:

When each item passes yet the provider still rejects traffic, escalate to account status, quotas, or org policy—not another round of blind node roulette.

Closing Thoughts

Claude Code is a stress test for the same habits that keep any serious developer tools pipeline healthy: explicit hostnames from logs, Clash routing rules that win in the right order, DNS that matches your fake-ip story, and one calm policy group that carries both Anthropic API calls and npm registry fetches without drama. Compared with chasing “faster nodes,” aligning those layers usually slashes the bland timeout errors that make terminal proxy tuning look impossible—especially when mihomo already gives you the observability you need, if you choose to read it.

When you want a maintained client and installer that tracks the Meta ecosystem, start from our download center instead of scattered mirrors, then layer DNS, explicit domain rows, and provider-specific guides in that order—this page slots between browser-focused Claude troubleshooting and IDE-wide Cursor routing without duplicating either story. → Download Clash for free and experience the difference