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 VS Code Copilot 2 tools — connect in under 2 minutes

Name: Merriam-Webster
Availability: InStock
Author: Vinkius

code.visualstudio.com/docs/copilot/chat/mcp-servers

Built by Vinkius GDPR 2 Tools IDE

GitHub Copilot in VS Code is the most widely adopted AI coding assistant, embedded directly into the world's most popular code editor. With MCP support in Agent mode, Copilot can access external data and APIs to generate context-aware code grounded in real-time information.

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Classic Setup·json

{
  "mcpServers": {
    "merriam-webster": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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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.

GitHub Copilot Agent mode brings Merriam-Webster data directly into your VS Code workflow. With a project-scoped config, the entire team shares access to 2 tools. Copilot queries live data, generates typed code, and writes tests from actual API responses, all without leaving the editor.

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 VS Code Copilot 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 VS Code Copilot via MCP

Follow these steps to integrate the Merriam-Webster MCP Server with VS Code Copilot.

Create MCP config

Create a .vscode/mcp.json file in your project root

Add the server config

Paste the JSON configuration above

Enable Agent mode

Open GitHub Copilot Chat and switch to Agent mode using the dropdown

Start using Merriam-Webster

Ask Copilot: "Using Merriam-Webster, help me...". 2 tools available

Why Use VS Code Copilot with the Merriam-Webster MCP Server

GitHub Copilot for Visual Studio Code provides unique advantages when paired with Merriam-Webster through the Model Context Protocol.

VS Code is used by over 70% of developers. adding MCP tools to Copilot means your team can leverage external data without leaving their primary editor

Project-scoped MCP configs (`.vscode/mcp.json`) let you commit server configurations to your repository, ensuring the entire team shares the same tool access

Copilot's Agent mode integrates MCP tools seamlessly with file editing, terminal commands, and workspace search in a single agentic loop

GitHub's enterprise compliance and audit features extend to MCP tool usage, providing visibility into how AI interacts with external services

Merriam-Webster + VS Code Copilot Use Cases

Practical scenarios where VS Code Copilot combined with the Merriam-Webster MCP Server delivers measurable value.

Live API integration: Copilot can query an MCP server, inspect the response schema, and generate typed API client code in the same step

DevSecOps workflows: security teams can give developers access to domain intelligence tools directly in their editor for real-time vulnerability assessment during code review

Data pipeline development: Copilot fetches sample data via MCP and generates transformation scripts, validators, and test fixtures from actual API responses

Documentation generation: Copilot queries available tools and auto-generates README sections, API reference docs, and usage examples

Merriam-Webster MCP Tools for VS Code Copilot (2)

These 2 tools become available when you connect Merriam-Webster to VS Code Copilot via MCP:

define_word

Get the definition of a word

get_thesaurus

Get synonyms and antonyms

Example Prompts for Merriam-Webster in VS Code Copilot

Ready-to-use prompts you can give your VS Code Copilot 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 VS Code Copilot

Common issues when connecting Merriam-Webster to VS Code Copilot through the Vinkius, and how to resolve them.

MCP tools not available

Ensure you are in Agent mode in Copilot Chat. MCP tools only appear in Agent mode.

Merriam-Webster + VS Code Copilot FAQ

Common questions about integrating Merriam-Webster MCP Server with VS Code Copilot.

Which VS Code version supports MCP?

MCP support requires VS Code 1.99 or later with the GitHub Copilot extension. Ensure both are updated to the latest version. Older versions of Copilot may not expose the Agent mode toggle.

How do I switch to Agent mode?

Open the Copilot Chat panel and look for two mode options: "Ask" and "Agent". Click "Agent" to enable autonomous tool calling. In Ask mode, Copilot provides conversational answers but cannot invoke MCP tools.

Can I restrict which MCP tools Copilot can access?

Yes. VS Code shows a tool consent dialog before any MCP tool is invoked for the first time. You can also configure tool access policies at the organization level through GitHub Copilot settings.

Does MCP work in VS Code Remote or Codespaces?

Yes. MCP servers configured via .vscode/mcp.json work in Remote SSH, WSL, and GitHub Codespaces environments. The MCP connection is established from the remote host, so ensure the server URL is accessible from that environment.