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MCP Glossary

Comprehensive guide to the terminology, architecture, and concepts of the Model Context Protocol.

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Caching (MCP) The storage of previous MCP response data to speed up subsequent requests and reduce token consumption.
Capabilities Standard capabilities that both MCP clients and servers support, such as notifications or subscriptions.
Capability Negotiation The protocol-level negotiation between a client and server to agree on common features.
Client (MCP Client) An AI application or agent that connects to MCP servers to discover and use tools and resources.
Client Info Metadata about the AI application (host) that is shared with the MCP server during initialization.
Command Line Arguments Parameters passed to an MCP server process during startup to configure its behavior.
Communication Protocol A JSON-RPC 2.0 based protocol used for exchanging messages between MCP clients and servers.
Context The set of information (historical, environment, or data-driven) that informs an AI model's response.
Context Window The working memory of a Large Language Model, which MCP helps optimize by pruning unnecessary data.
Context Window Management The active management of available tokens in an AI's memory to ensure the most relevant information is preserved.
Contextual Metadata Tagging The practice of attaching additional descriptors to data to help AI models understand and utilize information effectively.
Create-MCP-Server A tool that simplifies the creation and initialization of new MCP server projects.
Cursor An opaque string used in MCP pagination to reference a specific point in a paginated result set.

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Max Tokens A parameter that limits the length of the AI model's response by capping the number of generated tokens.
MCP Audit Log A searchable, immutable record of every interaction between an MCP client and server for security and compliance monitoring.
MCP Best Practices Recommended architectural and implementation patterns to ensure high performance and reliability in MCP systems.
MCP Bridge A component that translates between the Model Context Protocol and other communication standards or external APIs.
MCP Compliance The adherence of an MCP implementation to security, privacy, and regulatory standards.
MCP Composition The ability to bridge multiple discrete MCP servers into a unified, intelligent API mesh for complex multi-agent reasoning.
MCP Credential Rotation The automated process of periodically changing the secrets (API keys, tokens) used by MCP servers to access external services.
MCP Health Check A period check performed by an MCP client to ensure a server is still running and responsive.
MCP Hub A centralized platform or repository for discovering, sharing, and managing MCP servers.
MCP Icon Visual metadata provided by MCP servers to help clients display and identify them in user interfaces.
MCP Manifest A configuration file that describes a server's identity, entry points, and required permissions.
MCP Metadata Additional descriptive data attached to MCP resources, tools, or prompts to provide specialized context to clients.
MCP Middleware A layer that sits between an MCP client and server to intercept, modify, or audit protocol messages.
MCP on Lambda Running MCP servers as serverless functions on AWS Lambda for infinite scalability and zero-maintenance infrastructure.
MCP over VPN Connecting a local MCP client to a remote MCP server through a Virtual Private Network for secure, encrypted communication.
MCP Performance Tuning Optimizing MCP server performance to reduce latency, token usage, and resource consumption.
MCP Telemetry Comprehensive observability for MCP servers in HasMCP, including live tool-call logging and usage metrics.
MCP Tracing The capturing and analysis of the path of a request through an MCP system to debug performance and reliability.
Model Context Protocol (MCP) An Anthropic-developed open standard for integrating AI systems with external data and tools.
Model Preferences Hints or requirements provided to an AI host regarding which specific model or model family should be used for a task.
Multi-Server Orchestration The management and coordination of multiple MCP servers by a single host application to solve complex, cross-domain tasks.

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