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 skills/reliefeai/browser-relay/browser-relaynpx skills add reliefeai/browser-relay --skill browser-relaygit clone --depth 1 https://github.com/reliefeai/browser-relayWrote 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/reliefeai/browser-relay/browser-relay)<a href="https://agentmods.dev/skills/reliefeai/browser-relay/browser-relay"><img src="https://agentmods.dev/badge/skills/reliefeai/browser-relay/browser-relay.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 5.1 | $0.00086 | $0.03584 |
| Opus 5 | $0.00043 | $0.01792 |
| Sonnet 5 | $0.00017 | $0.00717 |
| Haiku 4.5 | $0.00009 | $0.00358 |
Grade A, and why
browser-relay 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 6d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
interaction. Do not hand-write `curl` for normal agent browsing tasks. The CLI How it starts
The opening of the file, as written. The whole thing — 361 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Relay Skill
Work alongside the user in the Chrome they already use. Browser Relay lets the agent operate existing tabs through a Skill + CLI, including background tabs, without launching a blank browser profile or repeatedly pulling Chrome to the foreground. Remote Relay can reach the user's explicitly enabled browser on another machine.
Use Browser Relay For
Use Browser Relay when you need to:
- Share the user's current Chrome — keep their existing tabs, cookies, extensions, and login state
- Interact with login-protected sites — including SSO, intranet pages, dashboards, Gmail, Notion, and similar apps
- Work without interrupting the foreground tab — select a specific background tab and keep the user's current tab in place
- Reach another machine — use Remote Relay only after the user explicitly enables it on that browser
- Handle dynamic pages — JavaScript-rendered content and SPAs
- Perform actions — click buttons, fill forms, scroll, take screenshots
- Get structured page text — annotated DOM snapshot with
[link],[button],[input]markers - Evaluate arbitrary JavaScript in the page context
When NOT to use:
- Simple static pages without login — use WebFetch or Jina Reader (faster, cheaper)
- Pure API calls — use the site's REST API directly
Prerequisites
Check setup before the first browser action:
browser-relay doctor
If browser-relay is not installed, tell the user to install the open-source
CLI, then rerun the check:
npm install -g @linsoai/browser-relay
browser-relay path
The user must load the directory printed by browser-relay path from
chrome://extensions and explicitly enable the extension. Do not install it,
enable Remote Relay, or invent a Remote Device ID without the user. A ready
setup has the relay server running, the extension connected, and at least one
regular Chrome tab attached.
Connection Info
Relay URL: http://127.0.0.1:18795
WebSocket: ws://127.0.0.1:18795/extension
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.
- 6d ago First seen · 361 lines · 86 tokens per session scan A 5e2b8ac45251
browser-relay is a skill published in the GitHub repository reliefeai/browser-relay (125 stars, last pushed 1mo ago), licensed MIT. It adds 86 tokens to every session and 3,584 once invoked, about $0.0004 per session on Opus 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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