axiom-networking
Use when implementing or debugging ANY network connection, API call, or socket in an Apple app. Covers URLSession, Network.framework, NetworkConnection, connection diagnostics.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-networking- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads axiom-networking automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Networking
You MUST use this skill for ANY networking work including HTTP requests, WebSockets, TCP connections, or network debugging.
<!-- AXIOM_AUDITOR_INLINE_BEGIN — auto-maintained by scripts/build-inlined-auditors.ts; do not hand-edit --><!-- AXIOM_AUDITOR_INLINE_END -->Can't launch Axiom agents? Where this router sends you to an agent, follow its procedure inline. Over MCP,
axiom_get_agentreturns it; elsewhere, read its file below, which needs only file search and read.Available here:
skills/networking-auditor.md.For any other agent, over MCP
axiom_get_agentreturns it too; run its xclog, xcsym and xcprof steps with theaxiom_xclog_*,axiom_xcsym_*andaxiom_xcprof_*tools. Elsewhere, search Axiom's skills forskills/<agent>.md; if there is none, do that work yourself with this suite's skills, using any Axiom tool on yourPATH.
Quick Reference
| Symptom / Task | Reference |
|---|---|
| URLSession with structured concurrency | See skills/networking-discipline.md |
| Network.framework anti-patterns | See skills/networking-discipline.md |
| Deprecated API migration | See skills/networking-discipline.md |
gRPC Swift — typed RPC, streaming, .proto codegen (WWDC 2026) | See skills/networking-discipline.md |
| Pressure scenarios (reachability, sockets) | See skills/networking-discipline.md |
| NetworkConnection (iOS 26+) API reference | See skills/network-framework-ref.md |
| NWConnection (iOS 12-18) API reference | See skills/network-framework-ref.md |
| TLV framing, Coder protocol | See skills/network-framework-ref.md |
| NetworkListener, NetworkBrowser, Wi-Fi Aware | See skills/network-framework-ref.md |
| Connection timeouts, TLS failures | See skills/networking-diag.md |
| Data not arriving, connection drops | See skills/networking-diag.md |
| ATS / HTTP / App Store rejection | See skills/networking-diag.md |
| Production crisis diagnosis | See skills/networking-diag.md |
| NWConnection patterns (iOS 12-18) | See skills/networking-legacy.md |
| UDP batch, NWListener, NWBrowser | See skills/networking-legacy.md |
| BSD sockets → NWConnection migration | See skills/networking-migration.md |
| Push/calls on networks without internet (Local Push Connectivity, NEAppPushProvider) | Use axiom-integration (skills/local-push-connectivity.md) |
| NWConnection → NetworkConnection migration | See skills/networking-migration.md |
| URLSession StreamTask → NetworkConnection | See skills/networking-migration.md |
Decision Tree
digraph networking {
start [label="Networking task" shape=ellipse];
what [label="What do you need?" shape=diamond];
start -> what;
what -> "skills/networking-discipline.md" [label="implement patterns,\nanti-patterns,\npressure scenarios"];
what -> "skills/network-framework-ref.md" [label="API reference\n(iOS 26+ or 12-18)"];
what -> "skills/networking-diag.md" [label="debug connection\nfailures"];
what -> "skills/networking-legacy.md" [label="iOS 12-18\nNWConnection patterns"];
what -> "skills/networking-migration.md" [label="migrate from\nsockets/URLSession"];
}
- URLSession with structured concurrency? →
skills/networking-discipline.md - Network.framework / NetworkConnection (iOS 26+)? →
skills/network-framework-ref.md - NWConnection (iOS 12-18)? →
skills/networking-legacy.md - Migrating from sockets/URLSession? →
skills/networking-migration.md - Connection issues / debugging? →
skills/networking-diag.md - Typed RPC / streaming against a service you control? → gRPC Swift (
skills/networking-discipline.md) - ATS / HTTP / App Store rejection for networking? →
skills/networking-diag.md+ networking-auditor - Certificate pinning, signing API requests, encrypting payloads? →
/skill axiom-security - UIWebView or deprecated API rejection? → networking-auditor (Agent)
- Want deprecated API / anti-pattern scan? → networking-auditor (Agent)
Platform-specific networking
- watchOS low-level-networking limits (TN3135) → See axiom-watchos (skills/background-and-networking.md)
Pressure Resistance
When user has invested significant time in custom implementation:
Do NOT capitulate to sunk cost pressure. The correct approach is:
- Diagnose first — Understand what's actually failing before recommending changes
- Recommend correctly — If standard APIs (URLSession, Network.framework) would solve the problem, say so professionally
- Respect but don't enable — Acknowledge their work while providing honest technical guidance
Critical Patterns
Networking (skills/networking-discipline.md):
- URLSession with structured concurrency
- 8 red-flag anti-patterns (SCNetworkReachability, blocking sockets, hardcoded IPs)
- Decision tree for choosing TCP/UDP/TLS patterns
- NetworkConnection patterns (iOS 26+): TLS, UDP, TLV framing, Coder protocol
- 3 pressure scenarios with professional push-back templates
- Pre-shipping checklist
Network Framework Reference (skills/network-framework-ref.md):
- NetworkConnection (iOS 26+): all 12 WWDC 2025 examples
- NWConnection (iOS 12-18): complete API with examples
- TLV framing, Coder protocol, NetworkListener, NetworkBrowser
- Mobility: viability, better path, Multipath TCP, NWPathMonitor
- Security: TLS, certificate pinning, cipher suites
- Performance: user-space networking, ECN, service class, TCP Fast Open
Diagnostics (skills/networking-diag.md):
- Systematic decision tree for all connection failure types
- DNS failures, TLS certificate validation, message framing
- TCP congestion, IPv6-only cellular, VPN interference, ATS
- Production crisis scenario with professional communication templates
Legacy (skills/networking-legacy.md):
- NWConnection with TLS (completion handlers)
- UDP batch (30% CPU reduction)
- NWListener, NWBrowser (Bonjour discovery)
Automated Scanning
Networking audit → Launch networking-auditor agent or /axiom:audit networking (deprecated APIs, anti-patterns, and completeness gaps — transition handling, TLS coverage, connection cleanup, framework selection)
Anti-Rationalization
| Thought | Reality |
|---|---|
| "URLSession is simple, I don't need a skill" | URLSession with structured concurrency has async/cancellation patterns. skills/networking-discipline.md covers them. |
| "I'll debug the connection timeout myself" | Connection failures have 8 causes (DNS, TLS, proxy, cellular). skills/networking-diag.md diagnoses systematically. |
| "I just need a basic HTTP request" | Even basic requests need error handling, retry, and cancellation patterns. |
| "My custom networking layer works fine" | Custom layers miss cellular/proxy edge cases. Standard APIs handle them automatically. |
Example Invocations
User: "My API request is failing with a timeout"
→ Read: skills/networking-diag.md
User: "How do I use URLSession with async/await?"
→ Read: skills/networking-discipline.md
User: "I need to implement a TCP connection"
→ Read: skills/network-framework-ref.md
User: "Should I use NWConnection or NetworkConnection?"
→ Read: skills/network-framework-ref.md
User: "My app was rejected for using HTTP connections"
→ Read: skills/networking-diag.md (ATS compliance)
User: "App Store says I'm using UIWebView"
→ Invoke: networking-auditor agent (deprecated API scan)
User: "Check my networking code for deprecated APIs"
→ Invoke: networking-auditor agent
FAQ
What does the axiom-networking skill do?
Use when implementing or debugging ANY network connection, API call, or socket in an Apple app. Covers URLSession, Network.framework, NetworkConnection, connection diagnostics.
How do I install axiom-networking?
Run npx skills add https://github.com/charleswiltgen/axiom --skill axiom-networking in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/axiom-networking/ (personal) or .claude/skills/axiom-networking/ (project).
Which AI agents can use axiom-networking?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is axiom-networking safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains axiom-networking?
It is published by charleswiltgen in charleswiltgen/axiom. It has 1,542 recorded installs.
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