troubleshooting

A troubleshooting guide for diagnosing broken tests, builds, performance, or development environments. It separates problems into categories such as test timing, dependency resolution, tool versions, and port conflicts.

In plain words
What is it for?
Use it when tests fail or hang, visual comparisons differ, builds break, caches or dependencies cause errors, performance gets worse, or the local setup is not working.
Why use it?
It gives a consistent way to narrow down failures instead of treating every error as a separate mystery.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/nvidia/elements/troubleshooting
Any agent
npx skills add NVIDIA/elements --skill troubleshooting
Clone the repo
git clone --depth 1 https://github.com/NVIDIA/elements

Made for: Claude Code, Codex.

Per session 106 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 614 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00106 $0.00614
Opus 5 $0.00053 $0.00307
Sonnet 5 $0.00021 $0.00123
Haiku 4.5 $0.00011 $0.00061

Measured 2d ago against content hash 0f38c7312e1f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

troubleshooting scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/troubleshooting/SKILL.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Troubleshooting

You MUST review the troubleshooting guideline when diagnosing test failures, build errors, or performance issues.

When to Use This Skill

  • Debugging unit test failures or timing issues
  • Investigating visual regression test differences
  • Troubleshooting Lighthouse performance scores
  • Resolving build failures or Wireit cache issues
  • Fixing Git LFS problems with visual baselines
  • Diagnosing CI/CD pipeline failures
  • Resolving development environment setup issues
  • Investigating performance regressions in tests or builds

Must Read File

Read the troubleshooting guide to get critical context for troubleshooting guidance.

Diagnostic Triage Workflow

  1. Identify the symptom category:

    • Test failure:unit, axe, visual, SSR, or lighthouse?
    • Build failure:Wireit cache, dependency resolution, TypeScript, or circular imports?
    • Environment issue:Node version, pnpm version, Git LFS, or port conflict?
    • Performance regression:slow tests, slow builds, or large bundles?
  2. Run the relevant diagnostic commands:

    • Test failures: pnpm run test -- src/<component>/<component>.test.ts (isolate the failing test)
    • Build failures: pnpm run ci:reset then pnpm run build (clear caches first)
    • Environment: node --version && pnpm --version && git lfs env (verify toolchain)
  3. Check the matching section in the troubleshooting guide for the specific symptom/solution pair.

  4. If the issue persists, compare against a working reference component (badge, button, or card) to spot structural differences.

Additional References

Read the full file on GitHub · 52 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 52 lines · 106 tokens per session scan A 0f38c7312e1f

Subscribe to this mod's changes

troubleshooting is a skill published in the GitHub repository NVIDIA/elements (83 stars, last pushed 2d ago), licensed Apache-2.0. It adds 106 tokens to every session and 614 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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