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gemini-search-mcp

by Sophomoresty

gemini-search-mcp

What is this

An MCP server that gives any AI agent (Claude, Cursor, Windsurf, etc.) the ability to search the web in real-time using Google's AI Mode — the same Gemini-powered search that lives in the "AI Mode" tab on Google Search.

Think of it as a free, unlimited alternative to Grok MCP / Tavily / SerpAPI, backed by Google's search index.

Related MCP server: gemini-search

Features

  • Free: No API key, no subscription, no quota

  • Unlimited: 60+ requests/min with zero rate limiting

  • Google quality: Powered by Gemini + Google Search (grounded in real web results)

  • MCP native: Works with Claude Desktop, Claude Code, Cursor, Windsurf, Cline

  • Also ships OpenAI API: /v1/chat/completions for non-MCP clients

  • Fast: ~1.5s average response time

Quick Start

pip install -e .

# Optional: install the undetected-chromedriver backend for CAPTCHA probes.
pip install -e '.[undetected]'

MCP Server (for AI agents)

gemini-search-mcp

OpenAI-compatible API

gemini-search --port 8080

MCP Integration

Claude Code

claude mcp add gemini-search -- gemini-search-mcp

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "gemini-search": {
      "command": "gemini-search-mcp",
      "args": [],
      "env": {
        "CDP_URL": "http://127.0.0.1:9222"
      }
    }
  }
}

Cursor / Windsurf

Same pattern — point to gemini-search-mcp as an stdio MCP server.

MCP Tools

Tool

Description

web_search(query)

Search the web and get a synthesized answer grounded in real-time results

ask(prompt)

General question — AI Mode auto-decides whether to search the web

Examples

web_search("latest AI regulation news 2026")
→ "The EU AI Act enforcement began on June 1, 2026, requiring..."

web_search("Bitcoin price today")
→ "As of June 30, 2026, Bitcoin is trading at $59,687 USD..."

ask("what is 1847 * 293")
→ "541171"

OpenAI API Usage

curl http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model":"gemini-search","messages":[{"role":"user","content":"What happened in the news today?"}]}'

Field

Value

Base URL

http://localhost:8080/v1

API Key

anything

Model

gemini-search

Environment Variables

Variable

Default

Description

CDP_URL

(none)

Chrome DevTools URL. If set, connects to existing Chrome instead of launching one

BROWSER_CHANNEL

chrome

Browser to use: chrome, msedge, chromium

HEADLESS

1

Set to 0 to show browser window

GEMINI_SEARCH_USER_DATA_DIR

(none)

Persistent Chrome profile directory. Reuses cookies across runs and is not deleted on shutdown

GEMINI_SEARCH_CDP_PORT

19250

CDP port used for self-launched Chrome

GEMINI_SEARCH_BROWSER_BACKEND

subprocess

Browser launcher: subprocess or undetected

GEMINI_SEARCH_PROXY_SERVER

(none)

Chrome proxy server, e.g. socks5://127.0.0.1:7897

GEMINI_SEARCH_CHROMEDRIVER

(none)

Chromedriver executable used by the undetected backend

Persistent Chrome profile / CAPTCHA priming

If Google shows /sorry/ CAPTCHA for a fresh temporary profile, prime a persistent profile once in a visible Chrome window, then reuse the same directory in headless mode:

# 1) Visible first run: solve CAPTCHA manually if Google asks.
gemini-search --no-headless --user-data-dir "$HOME/.local/share/gemini-search-mcp/chrome-profile"

# 2) Later runs: reuse the same cookies headlessly.
GEMINI_SEARCH_USER_DATA_DIR="$HOME/.local/share/gemini-search-mcp/chrome-profile" gemini-search

For Windows-side validation from WSL, run the probe with Windows Python through PowerShell so it launches Windows Chrome:

$profile = Join-Path $env:TEMP 'gemini-search-mcp-persistent-profile'
python .\scripts\windows_chrome_profile_probe.py `
  --profile-dir $profile `
  --mode two-phase `
  --out .\headless-reuse-result.json

Success evidence is ok=true and stages.headless_reuse.captcha=false in the JSON output.

undetected-chromedriver CAPTCHA probe

When a normal Chrome subprocess gets a Google /sorry/ CAPTCHA, install the optional backend and run the reusable probe against google.com.hk:

pip install -e '.[undetected]'
python scripts/uc_google_probe.py \
  --proxy socks5://127.0.0.1:7897 \
  --out-json uc-probe.json

Use the backend only when the probe reports ok=true, captcha=false, and successful_for_engine_integration=true.

gemini-search \
  --browser-backend undetected \
  --proxy-server socks5://127.0.0.1:7897 \
  --chromedriver-path /path/to/chromedriver \
  --no-headless

Observed on Windows Chrome for Testing 148 through Clash: headed UC passed (captcha=false and AI Mode tokens present), while headless UC hit Google /sorry/.

How It Works

Google rate-limits by TLS fingerprint quality — not by IP. Automated HTTP clients (curl, requests, httpx) get throttled after a few requests. But a real Chrome browser's fetch() calls are trusted unconditionally.

This tool runs a single real Chrome tab and executes all queries as fetch() inside it over CDP, giving every request an authentic Chrome TLS/HTTP2 fingerprint. Google sees normal browser traffic and applies no rate limits. The optional undetected backend still uses the same CDP query path after launch.

Agent calls web_search("query")
  → Chrome Runtime.evaluate(fetch)
    → Google Search AI Mode (token extraction + folwr endpoint)
      → Parse answer from HTML response
        → Return to agent

Comparison

gemini-search-mcp

Grok MCP

Tavily

Cost

Free

xAI API key ($)

API key ($)

Rate limit

None

API quota

API quota

Search backend

Google Search

Grok + web

Proprietary

Answer quality

Gemini synthesized

Grok synthesized

Extracted snippets

Setup

Chrome + CDP

API key

API key

Docker

docker compose up -d

Requirements

  • Python 3.10+

  • Chrome, Edge, or Chromium

  • Runtime dependencies from pyproject.toml

  • Optional: undetected-chromedriver and selenium via pip install -e '.[undetected]'

Limitations

  • Requires Chrome/Edge/Chromium installed

  • No conversation memory between requests

  • Answer extraction relies on Google's DOM structure (may break on updates)

  • Streaming is chunked, not per-token

Acknowledgments

License

MIT

Available Tools

2 tools
askA
Read-only

Ask Google AI Mode any question and get an AI-generated answer.

Similar to web_search but intended for general questions that may or may not require web search. Google AI Mode will automatically decide whether to search the web or answer from its training data.

Args: prompt: Any question or instruction. Google AI Mode will search the web if needed and synthesize an answer.

Returns: AI-generated answer, potentially grounded in web search results.

ParametersJSON Schema
NameRequiredDescriptionDefault
promptYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A4.7/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Describes the automatic decision process between web search and training data, and specifies return type as 'AI-generated answer, potentially grounded in web search results'. Annotations already declare readOnlyHint=true, and description aligns without contradiction.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Concise with no fluff. Front-loaded with purpose, then comparison, then structured Args and Returns sections. Every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With only one parameter and an output schema (implied), the description covers the tool's behavior, input, and output adequately. Mentions sibling tool for differentiation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 0% description coverage for the parameter, but the description provides an explicit Args section explaining 'prompt: Any question or instruction. Google AI Mode will search the web if needed and synthesize an answer.' This adds meaningful semantics beyond the schema type.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states 'Ask Google AI Mode any question and get an AI-generated answer' - specific verb+resource. Distinguishes from sibling web_search by noting it's for general questions that may not require web search.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly compares to web_search and explains that Google AI Mode decides whether to search the web or answer from training data, providing good context on when to use. Lacks explicit 'when not to use' but covers key distinction.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 2 tool updatesv0.4.0
    • First observedask
    • First observedweb_search

TDQS

A4.1/5.0

Scored across 2 tools

Disambiguation4/5

The two tools have distinct intentions: 'ask' for general questions that may use training data, and 'web_search' for explicit web-grounded answers. The description of 'ask' clarifies it is similar but flexible, reducing ambiguity. However, an agent might still be uncertain which to choose when a question could be answered from either source.

Naming Consistency3/5

'ask' is a single verb, while 'web_search' is verb_noun with underscore. They do not follow a consistent pattern, which could be slightly confusing. However, both names are descriptive and readable.

Tool Count3/5

With only 2 tools, the server feels thin for a search/QA domain. Typically a well-scoped server has 3-15 tools. However, for a specialized server focused on Google AI Mode, two tools (one for general questions and one for web search) might suffice, but it's on the lower end of acceptable.

Completeness3/5

The server covers two modes of AI-powered answering, but lacks a tool for pure training-data answers without web search, as 'ask' may still use web search. Users cannot force offline-only answers. Additionally, there is no tool for raw search results, only synthesized answers. This leaves notable gaps for a comprehensive search toolset.

Maintenance

ActivityInactive
ResponsivenessUnresponsive

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