[Remote Agents] Add gRPC transport support#21348

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alisa-alisa wants to merge 9 commits intomainfrom

Commits on Mar 6, 2026

feat(a2a): add robust A2A V0 support, gRPC transport, and config validation
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feat(a2a): implement robust URL parsing and SSRF protection for agent cards
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feat(a2a): add deep SSRF validation for all transport URLs in agent card
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feat(a2a): strengthen SSRF protection with DNS resolution
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feat(a2a): add DNS rebinding protection and robust URL reconstruction
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feat(a2a): implement robust IP validation, secure acknowledgement, and URL splitting fix
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fix(a2a): address SSRF in AgentRegistry card hashing by using safeFetch
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refactor(a2a): standardize safeFetch signature and simplify usage in registry and client manager
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fix(a2a): correctly index agents by overridden name and prevent collisions
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