What is grok-chrome-bridge AGENTS.md?

Instructions for a Chromium browser extension and native messaging host that share the active Chrome profile with Grok Build. They also define verification commands and restrictions for the bridge.

Use them when developing or checking the Grok Chrome Bridge, including its extension manifest, native host tests, and MCP wrapper.

They help keep the browser bridge working as intended while avoiding unsafe changes such as exposing extra native-message origins or storing keys in the extension.

How davidsolheim/grok-chrome-bridge configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to davidsolheim/grok-chrome-bridge. 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/davidsolheim/grok-chrome-bridge/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/davidsolheim/grok-chrome-bridge

Made for: Codex, OpenCode.

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/instructions/davidsolheim/grok-chrome-bridge/agents-md/github.svg)](https://agentmods.dev/instructions/davidsolheim/grok-chrome-bridge/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/davidsolheim/grok-chrome-bridge/agents-md"><img src="https://agentmods.dev/badge/instructions/davidsolheim/grok-chrome-bridge/agents-md/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/instructions/davidsolheim/grok-chrome-bridge/agents-md"><img src="https://agentmods.dev/badge/instructions/davidsolheim/grok-chrome-bridge/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 152 This file is loaded in full into every session.

When invoked 152 The same file — it is already loaded in full.

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	$0.00152	$0.00152
Opus 5.5	$0.00061	$0.00061
Sonnet 5.5	$0.00030	$0.00030
Haiku 4.5	$0.00015	$0.00015

Measured 2mo ago against content hash b982d78c353d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

grok-chrome-bridge AGENTS.md 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.

AGENTS.md · 21 lines

What it actually says

Grok Chrome Bridge

Chromium MV3 extension + native messaging host that advertises the Active Chrome profile to Grok Build.

Verify

python3 -m json.tool extension/manifest.json >/dev/null
python3 tests/test_native_host.py
node tests/test_mcp_wrapper.mjs

Expected extension ID (from extension/manifest.json key): kaelkjfngeajflpnjpgoijcjjcalnphi.

Do not

Launch a new Chrome user-data-dir from the MCP wrapper
Broaden native messaging allowed_origins
Commit *.pem or ~/.grok/chrome-bridge.json
Put API keys in the extension

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 · 21 lines · 152 tokens per session scan A b982d78c353d

Subscribe to this mod's changes

grok-chrome-bridge AGENTS.md is an instructions file published in the GitHub repository davidsolheim/grok-chrome-bridge (2 stars, last pushed 2mo ago), licensed MIT. It adds 152 tokens to every session, about $0.0006 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-automation chrome-devtools chrome-extension grok mcp native-messaging

grok-chrome-bridge AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
grok-chrome-bridge AGENTS.mddavidsolheim/grok-chrome-bridge	Instructions file	2	2mo ago	MIT	A	152	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
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langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

grok-chrome-bridge: Instructions file for Codex