threat-vector-security/skills/browser-session-defense
skills/browser-session-defense/SKILL.md
# Browser Session Defense Use this when the work is about security boundaries around Guardian-managed browser tools rather than generic web UI testing. ## Core Boundary - GuardianAgent can directly control and reason about browsing that happens through its managed browser tools. - GuardianAgent does not get rich page-level visibility into the user's normal browser sessions unless additional components exist outside the current runtime. ## Workflow 1. Clarify whether the browsing is: - Gu
$ install --global
skillsauthnpx skillsauth add threat-vector-security/guardian-agent skills/browser-session-defenseInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Apr 16, 2026, 2:22 PM4.1s3 files scanned
SKILL.md
Browser Session Defense
Use this when the work is about security boundaries around Guardian-managed browser tools rather than generic web UI testing.
Core Boundary
- GuardianAgent can directly control and reason about browsing that happens through its managed browser tools.
- GuardianAgent does not get rich page-level visibility into the user's normal browser sessions unless additional components exist outside the current runtime.
Workflow
- Clarify whether the browsing is:
- Guardian-managed
- user-driven in a normal browser
- For Guardian-managed browsing:
- prefer read-only page understanding first
- use the lowest-power browser tool that answers the question
- treat uploads, storage-state operations, and script execution as higher-risk
- For user-driven browsing:
- explain the visibility boundary clearly
- fall back to host and network signals when appropriate
Tooling Guidance
- Read-only page work: prefer
browser_read,browser_links, andbrowser_extract. - Interactive browser work: use
browser_stateplusbrowser_act, or Playwright tools directly when you need lower-level control. - Do not use
browser_run_code. - Treat
browser_evaluate, file uploads, and storage-state operations as approval-worthy actions.
Boundaries
- Use
webapp-testingfor functional UI verification and bug reproduction. - Use
host-firewall-defensewhen the only available evidence is indirect host or network drift around browser activity. - Use
security-mode-escalationwhen browser risk needs to be translated intomonitor,guarded, orlockdownrecommendations.
Gotchas
- Do not imply GuardianAgent can see arbitrary tabs or page contents in the user's own browser when it cannot.
- Do not default to the most powerful raw MCP tool for basic page reading.
- Do not recommend storage-state or upload actions as if they were harmless read-only inspection.
Read references/visibility-boundary.md when the user is confused about what GuardianAgent can and cannot observe in browser activity.
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