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/tabbit-browser/tabbit-devtools-skill/tabbit-devtoolsnpx skills add Tabbit-Browser/Tabbit-Devtools-Skill --skill tabbit-devtoolsgit clone --depth 1 https://github.com/Tabbit-Browser/Tabbit-Devtools-SkillWhat 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 | $0.00040 | $0.01150 |
| Opus 5 | $0.00020 | $0.00575 |
| Sonnet 5 | $0.00008 | $0.00230 |
| Haiku 4.5 | $0.00004 | $0.00115 |
Grade A, and why
tabbit-devtools 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tabbit Devtools
Prefer this skill whenever the request is explicitly about Tabbit or includes phrases like 用我的 tabbit 浏览器, 在 Tabbit 里, Tabbit 当前页, or Tabbit 当前标签.
Treat Tabbit as a Chromium-based browser.
This skill is about how to connect agent-browser to Tabbit.
After the connection is established, handle browser automation and inspection through the normal agent-browser workflow.
Do not implement a parallel browser automation layer, bridge daemon, or custom CDP client inside this skill.
agent-browser Quick Reference
Treat agent-browser as the browser-operation layer after Tabbit endpoint discovery.
The most relevant commands for this skill are:
open <url>snapshot -iclick @e3fill @e5 <text>press Enter
Do not restate a full agent-browser manual here. Use these commands as the default vocabulary for Tabbit tasks, and prefer the official README for any broader command surface.
Quick Path
- Detect the platform and search for
DevToolsActivePort:- macOS:
~/Library/Application Support/Tabbit/DevToolsActivePortfirst, then~/Library/Application Support/Tabbit Browser/DevToolsActivePort - Windows:
%LOCALAPPDATA%\Tabbit Browser\User Data\DevToolsActivePortfirst, then%APPDATA%\Tabbit\User Data\DevToolsActivePort
- macOS:
- Use both lines in that file:
- line 1: TCP port
- line 2: browser path such as
/devtools/browser/<id>
- Build the full browser endpoint as
ws://127.0.0.1:<port><path>. - Prefer that
wsEndpointoverhttp://127.0.0.1:<port>. Tabbit may expose the browser WebSocket while/json/versionand/json/liststill return404. - Prefer scripts/run_agent_browser_on_tabbit.py for actual browser actions. It injects the live
wsEndpointintoagent-browser --cdp .... - Use scripts/discover_tabbit_cdp.py when you only need structured connection facts.
- Once connected, use the full normal
agent-browserworkflow for page operations.
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 78 lines · 40 tokens per session scan A 839e370c2995
tabbit-devtools is a skill published in the GitHub repository Tabbit-Browser/Tabbit-Devtools-Skill (45 stars, last pushed 3mo ago), licensed MIT. It adds 40 tokens to every session and 1,150 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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