Glossary · Agents and ecosystems

Model Context Protocol (MCP)

Updated 2026-09-23

MCP's documentation describes it as an open-source standard for connecting AI applications to external systems, and compares it to a USB-C port for AI applications: one standard connection instead of many custom ones.

With MCP, an AI application can reach data sources such as files and databases, tools such as search engines, and workflows such as specialized prompts.

Definition

The Model Context Protocol is an open-source standard for connecting AI applications to external systems such as data sources, tools and workflows.

Also known as: MCP

How it relates to AgenID

MCP connects an agent to capabilities. AgenID identifies the agent and its operator. A tool exposed over MCP could let an agent resolve and verify an AgenID identifier during a task. The MCP server integration doc describes that pattern, not a package; nothing is published to npm.

Why it matters

As agents gain tools through MCP, the parties on the other end of those tools need a way to know which agent is calling. Tool access and identity are complementary layers.

MCP's documentation lists AI assistants and development tools among the clients that support it, so a resolve-and-verify tool built once could be offered to many different agents.

The reference deployment at agenid.com issues nothing above L1_REGISTERED today. L2 and higher require a VerificationAssertion signed by a root authority key, and that key has not been created yet.

What it does not mean

Connecting to an MCP server does not establish who operates the calling agent, and an AgenID does not grant access to any MCP tool. What an agent is allowed to do through a tool is the tool owner's permission decision. An identity check is one input to that decision, not a replacement for it.

Frequently asked questions

Is there an AgenID MCP server I can install?

Not from npm. The partner doc is an integration pattern, not a package.

Does MCP define agent identity?

This page makes no claim beyond MCP's own description as a standard for connecting AI applications to external systems.

How would an agent verify another agent through MCP?

By calling a tool that resolves the identifier and re-runs the checks described in how to verify an AI agent.

What agenid.com issues today

The reference deployment at agenid.com issues DECLARED and L1_REGISTERED only. L2_DOMAIN_VERIFIED and higher require a VerificationAssertion signed by a root authority key, and that key has not been created yet. L5 is reserved by the specification and is not issuable at all.

Identity is not permission

Which agent is acting and who declared it is one question. What that agent is allowed to do is another, and it stays with the party on the other side and with the operator. Protocol v1.1.1 defines no signed authorization object.

Sources

What is the Model Context Protocol (MCP)?

docs

Attaching AgenID Identity to an MCP Server

learn

How to verify an AI agent, step by step

glossary

Agent Card (A2A)