What were the notable Anthropic updates?

v1.42.0, fix(go): avoid panic when http.DefaultTransport is wrapped, and v0.21.0.

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Claude SDKs and developer tooling

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THREE SDKS SHIP AWS SUPPORT; PLUGIN SAFETY GATES FINALLY ENFORCED

By RepoJournal · Filed 06:02 UTC on May 12, 2026 · About Anthropic

Go, PHP, and Java SDKs all landed AWS client support overnight, while the plugin marketplace closed a critical enforcement gap that left 20 unsigned plugins/week shipping with zero policy review.

The SDK trio [1] [3] [6] moved in lockstep to add Claude Platform on AWS clients, giving teams a unified path to run Claude workloads on Amazon infrastructure. Go 1.42.0 also fixed a panic when callers wrap http.DefaultTransport [2] — a real production blocker for anyone using otelhttp or similar instrumentation. PHP 0.21.0 patched a pagination bug where PageCursor never advanced past the first page [4], plus fixed a header override issue that silently broke beta parameter passing [5]. Java 2.31.0 tightened SigV4 signing to not require Content-Type for body-less requests [7], making the AwsBackend usable for read/list/delete operations out of the box.

On the plugins side, the critical story: Scan Plugins — the marketplace safety gate — wasn't actually enforceable [8]. Weekly bump PRs opened with GITHUB_TOKEN bypassed pull_request triggers entirely, so 20 plugins/week got pulled to upstream HEAD with zero policy scan. PR #1815 fixes both the workflow triggering and the required-check blockage, finally making Scan Plugins a hard gate. Separately, SAP's two CDS plugins are now unified under a single author block [9], and Airtable's official MCP server landed in the marketplace [10].

Action items

→ Update Go SDK to 1.42.0 if you wrap http.DefaultTransport (otelhttp, etc) — panic fix is production-critical anthropics/anthropic-sdk-go [immediate]
→ Upgrade PHP SDK to 0.21.0 if you paginate any lists — fixes pagination completely broken at page 1 anthropics/anthropic-sdk-php [immediate]
→ Roll out Java 2.31.0 and Go 1.42.0 for AWS deployments — full SigV4 support now production-ready anthropics/anthropic-sdk-java [plan]
→ Merge #1815 to enforce Scan Plugins on all marketplace changes, including weekly bumps anthropics/claude-plugins-official [plan]

References

[1] v1.42.0 ↗ anthropics/anthropic-sdk-go
[2] fix(go): avoid panic when http.DefaultTransport is wrapped anthropics/anthropic-sdk-go
[3] v0.21.0 ↗ anthropics/anthropic-sdk-php
[4] fix(client): address bug with PageCursor not advancing past first page (#613) anthropics/anthropic-sdk-php
[5] fix(client): prevent betas request param being silently overridden by per-endpoint extraHeaders default (#615) anthropics/anthropic-sdk-php
[6] v2.31.0 ↗ anthropics/anthropic-sdk-java
[7] fix(aws,bedrock): don't require Content-Type for body-less SigV4 requests (#1229) anthropics/anthropic-sdk-java
[8] Make Scan Plugins a viable required check; auto-dispatch on bump PRs (#1815) anthropics/claude-plugins-official
[9] Add sap-cds-mcp plugin + SAP SE author block on cds-mcp (#1778) anthropics/claude-plugins-official
[10] Add airtable plugin (#1817) anthropics/claude-plugins-official

Quick answers

What shipped in Anthropic on May 12, 2026?: Go, PHP, and Java SDKs all landed AWS client support overnight, while the plugin marketplace closed a critical enforcement gap that left 20 unsigned plugins/week shipping with zero policy review. In total, 28 commits, 9 pull requests, and 3 releases landed.
What were the notable Anthropic updates?: v1.42.0, fix(go): avoid panic when http.DefaultTransport is wrapped, and v0.21.0.

CLAUDE AGENT SDK FIXES STDIN CLOSURE BUG IN BACKGROUND TASKS

The Python SDK's query method was prematurely closing stdin when background subagents were still in flight, breaking tool calls and silently bypassing hooks - now fixed in v0.2.127.

ai 16 shipped 1-min read

@anthropics 1 day ago

BUFFA v0.9.1 PATCHES REGRESSION THAT BROKE ORDINARY SCHEMAS

Buffa shipped an emergency patch overnight after v0.9.0 broke codegen on schemas with a few hundred proto files, small enough to hit in production.

ai 113 shipped 1-min read

@anthropics 2 days ago

CLAUDE FOUNDATION MODELS ADDS APP ATTEST, PLUGIN ECOSYSTEM STABILIZES

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ai 111 shipped 1-min read

@anthropics 3 days ago

BUFFA FIXES V0.9.0 REGRESSION, CLAUDE PLUGINS ECOSYSTEM GAINS 9 NEW INTEGRATIONS

Buffa's codegen was silently rejecting moderately large schemas due to a memory bound meant only for untrusted input, but a fix shipped overnight restores throughput and clears the path for googleapis-scale proto sets.

ai 156 shipped 2-min read

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