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MCP Servers 2.0 Makes the Modern-Era Cutover Concrete

The official server collection now ships v2 packages and CalVer Python servers while retaining legacy-client responses; filesystem root refreshes and tool-error semantics are the details operators should test.

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E2B 2.56 Lets HTTP/2 Set the Sandbox Concurrency Limit

The Python SDK now sizes sandbox connection pools from the server-advertised HTTP/2 stream limit instead of a fixed client guess. Six focused modules passed locally: 118 tests; cloud traffic was not reproduced.

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LangGraph 1.2.16 Separates Resume From Replay

Four continuation fixes target duplicate side effects and duplicated state updates across interrupts, subgraphs, and exit durability. Targeted local tests passed; PostgreSQL pruning was inspected but not reproduced.

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