MCP, A2A, and Functional Calling

 1. Model-Context Protocol (MCP)

MCP manages dynamic context windows across enterprise LLM infrastructure. It retrieves prior memory, history, and metadata to personalize every response without hardcoding logic into prompts.

2. Agent-to-Agent Protocol (A2A)

In A2A, agents talk to each other directly using shared protocols. Think of it as collaborative problem-solving between specialized local agents, especially useful in multi-agent ecosystems.

3. Functional Calling

Here, an LLM acts like a planner. It decomposes a task (e.g., comparing market caps), generates a Directed Acyclic Graph (DAG) of subtasks, and then sends each task to appropriate tools (math, search, APIs) for execution.

Conclusion

-  MCP is about managing context,

-  A2A is about agent collaboration,

-  Functional Calling is about task execution.