browser

browser is a skill for Claude Code, Codex from lemma-work/lemma-platform. It costs 61 tokens per session (3,517 once invoked), scanned A, original, AGPL-3.0.

A skill for operating a real web browser on websites, local apps, or deployed applications.

In plain words
What is it for?
Use it to navigate sites, test app journeys, inspect console or network behavior, scrape or save pages, and gather evidence for defects or release decisions.
Why use it?
It lets an agent check pages through actual navigation and interaction, including login flows, forms, screenshots, browser errors, and network activity.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to navigate sites, test app journeys, inspect console or network behavior, scrape or save pages, and gather evidence for defects or release decisions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lemma-work/lemma-platform/browser
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.

Any agent
npx skills add lemma-work/lemma-platform --skill browser
Clone the repo
git clone --depth 1 https://github.com/lemma-work/lemma-platform

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for browser

README.md
[![agentmods](https://agentmods.dev/badge/skills/lemma-work/lemma-platform/browser/github.svg)](https://agentmods.dev/skills/lemma-work/lemma-platform/browser)
Your own site
<a href="https://agentmods.dev/skills/lemma-work/lemma-platform/browser"><img src="https://agentmods.dev/badge/skills/lemma-work/lemma-platform/browser/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for browser

Your own site · 80×15
<a href="https://agentmods.dev/skills/lemma-work/lemma-platform/browser"><img src="https://agentmods.dev/badge/skills/lemma-work/lemma-platform/browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,517 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high YARA Match · line 26
    YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).
    Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
  • high Privilege Escalation · line 118
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
How audits are shown
Origin unknown 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 5.1 $0.00061 $0.03517
Opus 5.5 $0.00024 $0.01407
Sonnet 5.5 $0.00012 $0.00703
Haiku 4.5 $0.00006 $0.00352

Measured 27d ago against content hash 56930dc73c95, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

browser scanned grade A with 1 finding 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 27d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (templates/authenticated-session.sh, templates/capture-workflow.sh, templates/form-automation.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

**Local app debugging.** `curl -fsS http://127.0.0.1:<port>` first → `agent-browser open http://127.0.0.1:<port>` → reproduce → screenshot + console/network logs — don't stop at the visual failure.
lemma-skills/browser/SKILL.md · 231 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 27d ago Changed · +1 lines 56930dc73c95
  2. 28d ago Changed · +55 lines 573472747589
  3. 29d ago Changed · +16 lines 28bc87a5597b
  4. 1mo ago Changed · +5 lines 59a82b35d0bd
  5. 1mo ago Changed · +6 lines 4677d0850dd6
  6. 1mo ago First seen · 148 lines · 61 tokens per session scan A 2b8cda8d4320

Subscribe to this mod's changes

browser is a skill published in the GitHub repository lemma-work/lemma-platform (565 stars, last pushed yesterday), licensed AGPL-3.0. It adds 61 tokens to every session and 3,517 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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