What is tabby-mcp CLAUDE.md?

Instructions for tabby-mcp, an MCP server that controls the Tabby terminal through Chrome DevTools Protocol, a browser-style interface for communicating with an application.

Use it to list Tabby tabs, run JavaScript, query the interface, wait for elements and capture screenshots.

They explain how the server is structured, installed and connected, reducing setup errors when controlling Tabby programmatically.

How halilc4/tabby-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to halilc4/tabby-mcp. 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/halilc4/tabby-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/halilc4/tabby-mcp

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/instructions/halilc4/tabby-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/halilc4/tabby-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/halilc4/tabby-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/halilc4/tabby-mcp/claude-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/halilc4/tabby-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/halilc4/tabby-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 727 This file is loaded in full into every session.

When invoked 727 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	$0.00727	$0.00727
Opus 5.5	$0.00291	$0.00291
Sonnet 5.5	$0.00145	$0.00145
Haiku 4.5	$0.00073	$0.00073

Measured 2mo ago against content hash d2dbe4a5fb66, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tabby-mcp CLAUDE.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.

CLAUDE.md · 79 lines

How it starts

The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.

tabby-mcp

MCP server for controlling Tabby terminal via Chrome DevTools Protocol (CDP).

Architecture

server.py  ->  tools.py  ->  cdp.py  ->  Tabby (CDP port 9222)

server.py - MCP server entry point, stdio transport
tools.py - MCP tool definitions (execute_js, query, screenshot)
cdp.py - TabbyConnection class, CDP communication

Development

# Install dependencies
uv sync

# Run server
uv run tabby-mcp

# Tabby must be started with CDP debugging:
# tabby.exe --remote-debugging-port=9222

MCP Tools

Tool	Description
`list_targets`	List CDP targets (tabs) with index, title, url, ws_url
`execute_js`	Execute JS in Tabby context (async IIFE wrap by default)
`query`	Query DOM elements (auto-waits for Angular)
`screenshot`	Capture screenshot of Tabby window or element

execute_js parameters

target - Tab index (0=first, -1=last) or ws_url
code - JavaScript code. Use return to return values
wrap - Wrap in async IIFE (default: true). Fresh scope + await support. Set to false for raw execution (global functions, etc.)

query parameters

selector - CSS selector
include_children - Include children preview (default: false)
include_text - Include textContent (default: true)
skip_wait - Skip Angular/element wait (default: false)

Query automatically waits for Angular Zone.js stable and element existence. Use skip_wait=true only when you know the element already exists.

screenshot parameters

target - Tab index (0=first, -1=last) or ws_url
selector - CSS selector for element screenshot (optional, full window if omitted)
format - Image format: "png" or "jpeg" (default: "jpeg")
quality - JPEG quality 0-100 (default: 80, ignored for PNG)
save_path - File path to save screenshot (optional, returns base64 if omitted)

CDP Helper methods (cdp.py)

execute_js(expression, target, wrap=True) - Execute JS, return result. wrap=True for IIFE+async
list_targets() - List tabs with index, title, url, ws_url
query(selector) - Query elements, return info (tagName, id, className, text)
query_with_retry(selector, max_retries, delay) - Query with retry for dynamic elements
click(selector, index) - Click element
get_text(selector) - Return textContent
wait_for(selector, timeout, visible) - Wait for element to exist (internal)
wait_for_angular(timeout) - Wait for Angular Zone.js stable (internal)
screenshot(format, quality, selector) - Capture screenshot, return base64. selector=None for full window

Read the full file on GitHub · 79 lines

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 · 79 lines · 727 tokens per session scan A d2dbe4a5fb66

Subscribe to this mod's changes

tabby-mcp CLAUDE.md is an instructions file published in the GitHub repository halilc4/tabby-mcp (7 stars, last pushed 8d ago), licensed MIT. It adds 727 tokens to every session, about $0.0029 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

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tabby-mcp: Instructions file for Claude Code