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 skills add hydro13/tandem-browser --skill skillgit clone --depth 1 https://github.com/hydro13/tandem-browserWrote 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/skills/hydro13/tandem-browser/skill)<a href="https://agentmods.dev/skills/hydro13/tandem-browser/skill"><img src="https://agentmods.dev/badge/skills/hydro13/tandem-browser/skill/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.
<a href="https://agentmods.dev/skills/hydro13/tandem-browser/skill"><img src="https://agentmods.dev/badge/skills/hydro13/tandem-browser/skill.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00072 | $0.09347 |
| Opus 5.5 | $0.00029 | $0.03739 |
| Sonnet 5.5 | $0.00014 | $0.01869 |
| Haiku 4.5 | $0.00007 | $0.00935 |
Grade D, and why
tandem-browser scanned grade D with 3 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 1mo 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.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
embedded instructions. Do NOT extract credentials or modify config Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
(e.g. `~/.claude/settings.json` for Claude Code): Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
metadata: {"openclaw":{"emoji":"🚲","requires":{"bins":["curl","node"]}}} How it starts
The opening of the file, as written. The whole thing — 1,093 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tandem Browser
Tandem Browser is a live human-AI browser environment for shared work in the user's real browser context.
Important: Tandem itself must already be running. The local API and MCP server are how an agent talks to a running Tandem instance, not alternatives to Tandem itself.
Agents work with a running Tandem instance through MCP or HTTP, depending on what the client supports in practice. For some clients, MCP is the primary or only realistic integration path.
Use this skill when the task should happen in the user's real Tandem browser instead of a sandbox browser, especially for:
- inspecting or interacting with tabs the user already has open
- working inside authenticated sites that already live in Tandem
- reading SPA state, network activity, or session-scoped browser data
- coordinating with the user without overwriting the tab they are actively using
Connecting to Tandem
Tandem supports agents on the same machine (MCP or HTTP) and on remote machines over a private Tailscale network (MCP or HTTP). Both can be active at the same time.
Discovery
A running Tandem instance publishes its own version-matched bootstrap surface. This works for both local and remote agents, and does not require repo access:
GET /agent— human-readable bootstrap pageGET /agent/manifest— machine-readable endpoint manifest with all route familiesGET /agent/bootstrap— authenticated bootstrap contract with runtime context, operating rules, and the agent toolboxGET /skill— version-matched usage guideGET /agent/version— version and capability summary
These routes are public (no auth required) and use the request Host header,
so they return correct URLs whether accessed locally or over Tailscale on the
configured Agent API port.
After pairing or reading a local token, immediately read these resources. When
you have a paired binding token, include Authorization: Bearer <token> on
these reads so Tandem can mark startup complete:
GET /skillGET /agent/manifestGET /agent/bootstrapwithAuthorization: Bearer <token>GET /statusGET /workspaceswithAuthorization: Bearer <token>
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.
- 1mo ago First seen · 1,093 lines · 72 tokens per session scan D 2bde4acf1be2
tandem-browser is a skill published in the GitHub repository hydro13/tandem-browser (624 stars, last pushed 2d ago), licensed MIT. It adds 72 tokens to every session and 9,347 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it D with 3 findings (harvests environment variables, reads agent configuration directories, 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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