What is browser-relay?

Instructions for controlling an AI chat page opened in Chrome through the mailnotmilk browser extension. The extension connects browser messages to relay and shared-chat tools.

Use it to connect to an open AI chat page, read its messages, send replies, and relay conversations through mailnotmilk.

It provides a setup that works with Chrome’s normal launch process and avoids requiring remote debugging or manual extension loading. It also keeps login and browser setup steps out of the workflow.

How jrb00013/mailnotmilk configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jrb00013/mailnotmilk. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/jrb00013/mailnotmilk/main/.claude/skills/browser-relay/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/jrb00013/mailnotmilk

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jrb00013/mailnotmilk/browser-relay/github.svg)](https://agentmods.dev/skills/jrb00013/mailnotmilk/browser-relay)

Your own site

<a href="https://agentmods.dev/skills/jrb00013/mailnotmilk/browser-relay"><img src="https://agentmods.dev/badge/skills/jrb00013/mailnotmilk/browser-relay/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jrb00013/mailnotmilk/browser-relay"><img src="https://agentmods.dev/badge/skills/jrb00013/mailnotmilk/browser-relay.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 195 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00036	$0.00195
Opus 5.5	$0.00014	$0.00078
Sonnet 5.5	$0.00007	$0.00039
Haiku 4.5	$0.00004	$0.00019

Measured 2mo ago against content hash 8745affec10d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

browser-relay 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 2mo 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.

.claude/skills/browser-relay/SKILL.md · 30 lines

What it actually says

browser-relay

Setup

./install.sh auto-installs the extension (External Extensions + desktop launcher). User fully quits Chrome once, then uses the normal shortcut.

Re-run only: mailnotmilk extension

Flow

Chrome open normally + any AI site
browser_connect { "mode": "extension" }
relay_tick / chat_say / browser_send_message

Rules

Never require --remote-debugging-port
Never ask for manual Load unpacked (install handles it)
Never ask the user to log in
Works for any http(s) chat UI

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.

2mo ago First seen · 30 lines · 36 tokens per session scan A 8745affec10d

Subscribe to this mod's changes

browser-relay is a skill published in the GitHub repository jrb00013/mailnotmilk (2 stars, last pushed 8d ago), licensed MIT. It adds 36 tokens to every session and 195 once invoked, about $0.0001 per session on Opus 5.5. 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.

Browser automation

browser-relay next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
browser-relayjrb00013/mailnotmilk	Skill	2	8d ago	MIT	A	36	Claude Code
interactive-loginyc-software/qm	Skill	16k	yesterday	MIT	A	46	Claude Code, Codex
pinchtab-mcppinchtab/pinchtab	Skill	11k	10d ago	MIT	A	52	Claude Code, Codex
azure-messaging-webpubsub-javamicrosoft/skills	Skill	3.2k	yesterday	MIT	A	43	Claude Code
cua-driverdavidondrej/skills	Skill	4.3k	3d ago	MIT	A	68	Claude Code, Codex
open-design-browsercompozy/compozy	Skill	2.8k	yesterday	MIT	A	56	Claude Code, Codex
southwestborski/travel-hacking-toolkit	Skill	895	yesterday	MIT	A	40	Claude Code

mailnotmilk: Skill for Claude Code