The original title is "Agent Protocols Fail at the Seams | Focused Labs"

Short summary

Agent protocols like MCP, A2A, and ACP are becoming standard infrastructure, but security fails at the seams where locally valid calls compose into unsafe global paths. A 2026 paper found 35 specification-level findings and 30 composition failures across five protocols. The article warns that protocol support does not equal control plane functionality, and runtime security must track authority, context changes, and evidence after actions.

• •Agent protocol composition creates security risks at boundaries where locally valid calls become unsafe global paths
• •2026 research paper found 35 spec-level findings and 30 composition failures across five agent protocols
• •MCP, A2A, and ACP standardize communication but not workflow coordination, execution, or optimization

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