A2A Research Digest — 2026/03/11: A Survey of Agent Interoperability Protocols

This digest covers recent academic research on the Agent-to-Agent (A2A) protocol and related interoperability standards.

Paper 1: A Survey of Agent Interoperability Protocols

Authors: Abul Ehtesham, Aditi Singh, Gaurav Kumar Gupta, Saket Kumar

arXiv:

Date: April 23, 2025 (v1), May 2, 2025 (v2)

Core Contributions:

1. Comprehensive security analysis of the A2A protocol


2. Threat modeling using the MAESTRO framework


3. Practical secure development methodologies and architectural best practices

Technical Summary:

As Agentic AI systems evolve from basic workflows to complex multi-agent collaboration, the A2A protocol becomes essential. This paper provides a security-focused analysis examining:

• 
  Agent Card Management: Security considerations for capability discovery


• 
  Task Execution Integrity: Ensuring reliable task delegation


• 
  Authentication Methodologies: Secure client-server interactions


• 
  A2A + MCP Synergy: How the two protocols complement each other for secure interoperability

The MAESTRO framework (designed for AI risks) is applied to proactively identify potential security issues in A2A deployments.

Paper 3: A Study on the MCP x A2A Framework

Authors: Cheonsu Jeong

arXiv: 2506.01804

Date: June 2, 2025 (v1), June 9, 2025 (v2)

Published: Journal of Intelligence and Information Systems, 31(3), 141-170 (2025)

Core Contributions:

1. In-depth technical analysis of Google's A2A and Anthropic's MCP


2. Implementation methodology for MCP x A2A integration


3. Exploration of how two protocols complement each other

Technical Summary:

This study takes an integrated approach, exploring how A2A and MCP can complement each other to address interoperability issues:

• 
  A2A Role: Standardized communication for agents to collaborate across heterogeneous environments


• 
  MCP Role: Structured I/O framework for agents to connect with external tools and resources


• 
  Integration Benefits: Combined protocol approach enables more robust agent ecosystems

Analysis & Insights

Key Trends:

1. Protocol Convergence: The research community increasingly recognizes that MCP and A2A are complementary, not competing. MCP handles agent-to-tool communication while A2A handles agent-to-agent collaboration.




2. Security Focus: With multi-agent systems becoming more prevalent, security analysis (as in Habler & Huang 2025) is crucial for enterprise adoption.




3. Standardization Push: The Linux Foundation's stewardship of A2A (as of June 2025) signals industry-wide commitment to open standards.




4. Practical Implementation: Papers like Jeong (2025) provide actionable implementation guidance for combining MCP and A2A in real-world applications.

Implications for Practitioners:

• Start with MCP for tool integration


• Add A2A for multi-agent collaboration


• Consider ANP for future decentralized agent marketplaces


• Prioritize security from the design phase

References

1. Ehtesham, A., et al. (2025). A survey of agent interoperability protocols. arXiv:2505.02279


2. Habler, I., et al. (2025). Building A Secure Agentic AI Application Leveraging A2A Protocol. arXiv:2504.16902


3. Jeong, C. (2025). A Study on the MCP x A2A Framework. arXiv:2506.01804

This digest is part of the A2A Research series, tracking academic developments in agent interoperability protocols.

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