Do I need separate API keys for the dictionary and thesaurus?

Yes, Merriam-Webster provides separate keys for the Collegiate Dictionary and the Collegiate Thesaurus. You must provide both in the credentials section to enable all tools.

What happens if a word is not found?

If an exact match is not found, the API often returns a list of suggestions. Your agent will display these suggestions to help you find the correct term.

Can I see the part of speech for a word?

Yes! Every definition returned by the `define_word` tool includes the part of speech (e.g., noun, verb, adjective) next to the word headword.

Merriam-Webster MCP Server for Google ADK 2 tools — connect in under 2 minutes

Name: Merriam-Webster
Availability: InStock
Author: Vinkius

google.github.io/adk-docs/tools/mcp-tools

Built by Vinkius GDPR 2 Tools SDK

Google Agent Development Kit (ADK) is Google's framework for building production AI agents. Add Merriam-Webster as an MCP tool provider through Vinkius and your ADK agents can call every tool with full schema introspection.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

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Vinkius supports streamable HTTP and SSE.

python

from google.adk.agents import Agent
from google.adk.tools.mcp_tool import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import (
    StreamableHTTPConnectionParams,
)

# Your Vinkius token. get it at cloud.vinkius.com
mcp_tools = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    )
)

agent = Agent(
    model="gemini-2.5-pro",
    name="merriam_webster_agent",
    instruction=(
        "You help users interact with Merriam-Webster "
        "using 2 available tools."
    ),
    tools=[mcp_tools],
)

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Merriam-Webster MCP Server

Equip your AI agent with the gold standard of the English language via the Merriam-Webster MCP server. This integration provides your agent with instant access to the prestigious Collegiate Dictionary and Thesaurus. Your agent can instantly fetch precise definitions, audit etymologies, and retrieve comprehensive synonym/antonym lists without you ever needing to browse a physical dictionary or website. Whether you are refining your writing or verifying technical linguistic nuances, your agent acts as a dedicated lexicographer through natural conversation.

Google ADK natively supports Merriam-Webster as an MCP tool provider. declare Vinkius Edge URL and the framework handles discovery, validation, and execution automatically. Combine 2 tools with Gemini's long-context reasoning for complex multi-tool workflows, with production-ready session management and evaluation built in.

What you can do

Word Definitions — Retrieve detailed definitions, parts of speech, and pronunciations for thousands of English words.
Thesaurus Auditing — Fetch extensive lists of synonyms, antonyms, and related words to enrich your vocabulary.
Usage Examples — Access authentic sentence examples to understand how words are used in real-world contexts.
Linguistic Intelligence — Verify the correct spelling and grammatical category of complex terms.
Discovery — Identify related words and linguistic patterns through aggregate search results.

The Merriam-Webster MCP Server exposes 2 tools through the Vinkius. Connect it to Google ADK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Merriam-Webster to Google ADK via MCP

Follow these steps to integrate the Merriam-Webster MCP Server with Google ADK.

Install Google ADK

Run pip install google-adk

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Create the agent

Save the code above and integrate into your ADK workflow

Explore tools

The agent will discover 2 tools from Merriam-Webster via MCP

Why Use Google ADK with the Merriam-Webster MCP Server

Google ADK provides unique advantages when paired with Merriam-Webster through the Model Context Protocol.

Google ADK natively supports MCP tool servers. declare a tool provider and the framework handles discovery, validation, and execution

Built on Gemini models, ADK provides long-context reasoning ideal for complex multi-tool workflows with Merriam-Webster

Production-ready features like session management, evaluation, and deployment come built-in. not bolted on

Seamless integration with Google Cloud services means you can combine Merriam-Webster tools with BigQuery, Vertex AI, and Cloud Functions

Merriam-Webster + Google ADK Use Cases

Practical scenarios where Google ADK combined with the Merriam-Webster MCP Server delivers measurable value.

Enterprise data agents: ADK agents query Merriam-Webster and cross-reference results with internal databases for comprehensive analysis

Multi-modal workflows: combine Merriam-Webster tool responses with Gemini's vision and language capabilities in a single agent

Automated compliance checks: schedule ADK agents to query Merriam-Webster regularly and flag policy violations or configuration drift

Internal tool platforms: build self-service agent platforms where teams connect their own MCP servers including Merriam-Webster

Merriam-Webster MCP Tools for Google ADK (2)

These 2 tools become available when you connect Merriam-Webster to Google ADK via MCP:

define_word

Get the definition of a word

get_thesaurus

Get synonyms and antonyms

Example Prompts for Merriam-Webster in Google ADK

Ready-to-use prompts you can give your Google ADK agent to start working with Merriam-Webster immediately.

"Define the word 'serendipity'."

"Find synonyms for 'eloquent' in the Merriam-Webster thesaurus."

"What is the origin of the word 'lexicographer'?"

Troubleshooting Merriam-Webster MCP Server with Google ADK

Common issues when connecting Merriam-Webster to Google ADK through the Vinkius, and how to resolve them.

McpToolset not found

Update: pip install --upgrade google-adk

Merriam-Webster + Google ADK FAQ

Common questions about integrating Merriam-Webster MCP Server with Google ADK.

How does Google ADK connect to MCP servers?

Import the MCP toolset class and pass the server URL. ADK discovers and registers all tools automatically, making them available to your agent's tool-use loop.

Can ADK agents use multiple MCP servers?

Yes. Declare multiple MCP tool providers in your agent configuration. ADK merges all tool schemas and the agent can call tools from any server in a single turn.

Which Gemini models work best with MCP tools?

Gemini 2.0 Flash and Pro models both support function calling required for MCP tools. Flash is recommended for latency-sensitive use cases, Pro for complex reasoning.