Borrowing it
Nothing to install: this file belongs to captivus/chrome-agent. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/captivus/chrome-agent/main/AGENTS.mdgit clone --depth 1 https://github.com/captivus/chrome-agentWrote 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/instructions/captivus/chrome-agent/agents-md)<a href="https://agentmods.dev/instructions/captivus/chrome-agent/agents-md"><img src="https://agentmods.dev/badge/instructions/captivus/chrome-agent/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.
<a href="https://agentmods.dev/instructions/captivus/chrome-agent/agents-md"><img src="https://agentmods.dev/badge/instructions/captivus/chrome-agent/agents-md.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 | $0.07123 | $0.07123 |
| Opus 5.5 | $0.02849 | $0.02849 |
| Sonnet 5.5 | $0.01425 | $0.01425 |
| Haiku 4.5 | $0.00712 | $0.00712 |
Grade A, and why
chrome-agent AGENTS.md 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- **Cookie handoff for bulk.** `Network.getCookies '{"urls":["https://host/"]}'` extracts the session into a `Cookie:` header so a faster external client (`curl`) can fan out a large transfer outside the CDP channel. How it starts
The opening of the file, as written. The whole thing — 293 lines — stays where its author put it; the contents beside it link to each section on GitHub.
chrome-agent
Drive a real Chrome through the Chrome DevTools Protocol (CDP), from the terminal, for AI agents.
Install: uv tool install chrome-agent (or pip install chrome-agent). Requires Google Chrome or Chromium. Runtime dependencies: websockets, plus cryptography and keyring for encrypted session snapshots; no Playwright, no browser downloads.
What it is
Address a Chrome instance by name, and send it any CDP command or stream any CDP event. Two channels:
- One-shot (
chrome-agent <inst> Domain.method '{json}') — act: send one command, print the result, disconnect (~70 ms). - Attach (
chrome-agent attach <inst> +Event …) — observe: hold a connection and stream events as JSON lines.
The full protocol, tracked live. chrome-agent forwards your Domain.method straight to Chrome — nothing is validated against a bundled schema. Any command, event, or domain your installed Chrome supports works, including protocol surface newer than this build (e.g. CrashReportContext isn't among the bundled bindings, yet chrome-agent <inst> CrashReportContext.getEntries returns a normal result over the CLI). So help <inst> [Domain[.method]], read live from the browser, is the authoritative, version-correct reference — prefer it over any static list. The typed Python classes are a point-in-time snapshot, not a gate.
experimental ≠ unstable. Most of the live protocol is flagged experimental (domains carry the flag and their members inherit it), and it's tempting to avoid it — don't. Experimental items break at roughly the same rate as the stable core; what predicts churn is how actively a domain is developed, and CDP's busiest domains (Network, Runtime, Page, DOM) are stable-status. The one real experimental signal is removal/rename, and even that is rare. Practical posture: use whatever capability you need regardless of flag; pin the Chrome version you test against; re-verify signatures via help on upgrade.
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 Changed · +15 lines · +411 tokens per session 56181db01dc5
- 1mo ago Changed · +2 lines · +339 tokens per session 68095ad30b42
- 2mo ago Changed · +21 lines · +728 tokens per session 3e159f181773
- 2mo ago First seen · 255 lines · 5,645 tokens per session scan A 47696f5c82aa
chrome-agent AGENTS.md is an instructions file published in the GitHub repository captivus/chrome-agent (307 stars, last pushed yesterday), licensed MIT. It adds 7,123 tokens to every session, about $0.0285 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.
chrome-agent AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| chrome-agent AGENTS.mdcaptivus/chrome-agent | Instructions file | 307 | yesterday | MIT | A | 7,123 | 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 | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 275k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |