MCP, Skills, and Interoperable Tooling
Connect agents to external capabilities through explicit contracts, least privilege, versioning, and trustworthy discovery.
Learning objectives
- Explain the difference between a tool, MCP server, and skill
- Evaluate capability scope, versioning, and trust signals
- Design an integration review before enabling a new server
ToolDix original visual
Frame
Name the outcome and constraints.
Build
Try one bounded workflow.
Review
Keep evidence, revise, and share.
Interoperability needs contracts
A tool is a callable capability. An MCP server exposes a set of capabilities through a protocol. A skill is portable guidance for using capabilities consistently. None should be enabled solely because its name sounds useful.
Integration review
Before connecting a server, record owner, repository, version, permissions, network endpoints, data categories, authentication method, logs, and rollback steps. Pin versions where possible and review release changes before updating production.
Least privilege
Expose read-only capabilities first. Separate discovery from execution. A server that can create tickets should not also have access to unrelated credentials. Pass only the minimum user context required for a request.
Practice: capability card
Make a one-page card for one integration: inputs, outputs, failure modes, required secrets, permissions, trusted publisher evidence, and an emergency disable path.
Common mistake
Do not install a server from an unverified source into an environment that has production credentials.
Sources and license context
These references informed the lesson. ToolDix adds its own explanation, workflow, and practice rather than reproducing source material.
- Model Context Protocol Specification (Specification terms apply)
Take it further
Use a primary source to deepen this lesson.
Each recommendation is a direct link to the publisher or author. The study prompt is ToolDix editorial guidance, not copied course content.
Hands-on lab
LLM Course
Complete the pipeline exercise, then write down what information disappears when text becomes tokens.
Open original source
Classic reading
Attention Is All You Need
Read the abstract and architecture figure first; annotate what information flows between tokens.
Open original source
Course
AI Agents Course
Before using a framework, write down one tool contract and the exact state an agent is allowed to change.
Open original source