Who contributed to Anthropic on July 29, 2026?

5 developers shipped this update, including github-actions, Mic92, stainless-app, Max, and stainless-app[bot].

What were the notable Anthropic updates?

lib: add nextestRun to run pre-built test binaries through cargo-nextest, release: 0.120.2, and fix(mcp): support mcp sdk v2 alongside v1 (#300).

PYTHON SDK PATCHES MCP V2 COMPATIBILITY, CARGO-NIX ADDS NEXTEST INTEGRATION

anthropic-sdk-python shipped 0.120.2 with MCP SDK v2 support alongside v1, closing a critical interoperability gap as plugin infrastructure expands across the stack.

The Python SDK pushed two point releases overnight to resolve MCP (Model Context Protocol) version conflicts [2] [22]. Version 0.120.2 now supports both MCP v2 and v1 simultaneously [3], following a quick v0.120.1 that pinned the mcp extra to <2 [21] [23]. This matters because the ecosystem is fragmenting across SDK versions and tools need to interoperate at either level without forcing downgrades.

Simultaneously, cargo-nix-plugin landed a major testing improvement: nextestRun now exposes pre-built test binaries through cargo-nextest, giving developers per-test process isolation, retry logic, and profile support via .config/nextest.toml without synthesizing nextest's reuse-build inputs [1]. Follow-up commits refined the feature by exposing mkRun's extraArgs through nextestRun.withArgs [14] and recording the host libdir in binaries-metadata.json so nextest can resolve Rust dylibs correctly [15].

Across the plugin ecosystem, 98 pull requests flowed through three plugin registries overnight: knowledge-work-plugins, claude-plugins-official, and claude-plugins-community all pushed automated SHA bumps validated via claude plugin validate workflows before merge [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [16] [17] [18] [19] [20]. Each bump is gated on manual review before merging.