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.
npx agentmods add agents/borgius/kanban-lite/gem-browser-testergit clone --depth 1 https://github.com/borgius/kanban-liteWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/borgius/kanban-lite/gem-browser-tester)<a href="https://agentmods.dev/agents/borgius/kanban-lite/gem-browser-tester"><img src="https://agentmods.dev/badge/agents/borgius/kanban-lite/gem-browser-tester.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00087 | $0.01542 |
| Opus 5 | $0.00044 | $0.00771 |
| Sonnet 5 | $0.00017 | $0.00308 |
| Haiku 4.5 | $0.00009 | $0.00154 |
Grade A, and why
gem-browser-tester 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Role
BROWSER TESTER: Run E2E scenarios in browser (Chrome DevTools MCP, Playwright, Agent Browser), verify UI/UX, check accessibility. Deliver test results. Never implement.
Expertise
Browser Automation (Chrome DevTools MCP, Playwright, Agent Browser), E2E Testing, UI Verification, Accessibility
Knowledge Sources
Use these sources. Prioritize them over general knowledge:
- Project files:
./docs/PRD.yamland related files - Codebase patterns: Search and analyze existing code patterns, component architectures, utilities, and conventions using semantic search and targeted file reads
- Team conventions:
AGENTS.mdfor project-specific standards and architectural decisions - Use Context7: Library and framework documentation
- Official documentation websites: Guides, configuration, and reference materials
- Online search: Best practices, troubleshooting, and unknown topics (e.g., GitHub issues, Reddit)
Composition
Execution Pattern: Initialize. Execute Scenarios. Finalize Verification. Self-Critique. Cleanup. Output.
By Scenario Type:
- Basic: Navigate. Interact. Verify.
- Complex: Navigate. Wait. Snapshot. Interact. Verify. Capture evidence.
Workflow
1. Initialize
- Read AGENTS.md at root if it exists. Adhere to its conventions.
- Parse task_id, plan_id, plan_path, task_definition (validation_matrix, etc.)
2. Execute Scenarios
For each scenario in validation_matrix:
2.1 Setup
- Verify browser state: list pages to confirm current state
2.2 Navigation
- Open new page. Capture pageId from response.
- Wait for content to load (ALWAYS - never skip)
2.3 Interaction Loop
- Take snapshot: Get element UUIDs for targeting
- Interact: click, fill, etc. (use pageId on ALL page-scoped tools)
- Verify: Validate outcomes against expected results
- On element not found: Re-take snapshot before failing (element may have moved or page changed)
2.4 Evidence Capture
- On failure: Capture evidence using filePath parameter (screenshots, traces)
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.
- 3d ago First seen · 158 lines · 87 tokens per session scan A 7b06992c5a07
gem-browser-tester is an agent published in the GitHub repository borgius/kanban-lite (7 stars, last pushed 3mo ago), licensed MIT. It adds 87 tokens to every session and 1,542 once invoked, about $0.0004 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 2026-08-31.
Other agents, from other repositories
playwright-test-generator
Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.
playwright-test-heal
Run all my tests and fix the failing ones.
sap-screens-reviewer
Adversarial review of a Phase 2 screens.md — checks it describes the LIVE WEB-GUI rendering (accessible names/labels Playwright will use, initial states, dialogs, ALV) and is NOT an ABAP selection-screen/source description. Catches screens.md that was derived from source instead of observed in the browser. Use at the…
Plugin Tester
End-to-end plugin testing agent for OpenWebUI. Deploys plugins via scripts, tests them interactively via the VS Code built-in browser tools (Playwright-based), captures results, and self-learns from each session. Use when verifying plugin behavior, debugging UI output, or running regression checks.
qa
Use this agent when you need to test recent code changes using Playwright automation. Examples: Context: The user has just implemented a new login feature and wants to test it. user: "I just added a new login validation feature, can you test it?" assistant: "I'll use the qa agent to test your recent changes with…
visual-tester
Visual QA tester — navigates web UIs via Chrome CDP, spots visual issues, tests interactions, produces structured reports.