Browser Testing With Devtools
Use when verifying browser-based behaviour with Chrome DevTools, including DOM state, console output, network activity and performance evidence.
Install
$ agentstack add skill-mmccalla-coding-agent-skill-library-browser-testing-with-devtools ✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
About
Browser Testing With DevTools
When to use
Use this skill when a change affects a browser-rendered interface and you need runtime evidence from the browser rather than static code inspection alone.
Objective
Verify user-facing behaviour with DevTools evidence so frontend or browser issues are reproduced, localized and confirmed with the actual runtime state.
Procedure
- Reproduce the issue or feature in the browser.
- Inspect the DOM, console and network activity.
- Check state changes, errors and timing at the point of failure.
- Use performance or network traces when latency or rendering is relevant.
- Confirm the fix with the same browser path.
Rules
- Do not rely on screenshots alone when runtime evidence is available.
- Do not treat a successful page load as proof of correct behaviour.
- Do not skip console or network checks when a browser bug is involved.
- Do not use performance traces without first reproducing the user-visible problem.
References
Verification
- [ ] Browser flows exercised listed.
- [ ] DOM, console, network or performance evidence captured.
- [ ] Defects or regressions reported with reproduction steps.
- [ ] Residual untested browser risks stated.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: mmccalla
- Source: mmccalla/coding-agent-skill-library
- License: Apache-2.0
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.