Who contributed to Anthropic on August 21, 2026?

10 developers shipped this update, including github-actions, stainless-app[bot], stainless-app, Robert Craigie, ulofiai, anishesg, GautamSharma99, and rover0811, and 2 more.

What were the notable Anthropic updates?

v1.0.0, fix(beta): stop warning about `output_format=` on the parse/stream/tool_runner helpers, and fix(mcp): recognize mcp__github aggregate selector for GitHub MCP server initialization.

@anthropics

Claude SDKs and developer tooling

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ANTHROPIC SDK PYTHON HITS 1.0.0

By RepoJournal · Filed 07:03 UTC on August 21, 2026 · About Anthropic

10 people shipped this

github-actions @github-actions 3 cited

stainless-app[bot] @stainless-app[bot] 1 cited

Robert Craigie @craigie-ant 1 cited

ulofiai @ulofiai 1 cited

anishesg @anishesg 1 cited

GautamSharma99 @GautamSharma99 1 cited

rover0811 @rover0811 1 cited

stainless-app @stainless-app

RESILIENCE Agentic Solutions @WeAreResilience

GitHub Actions @actions-user

The Python SDK finally hits 1.0.0, but it comes with a breaking change that will require your attention before you upgrade.

anthropic-sdk-python shipped v1.0.0 overnight, a milestone release that upgrades the client to httpx2 with some minor breaking changes, so read MIGRATION.md before bumping [1]. The release also includes a fix that stops warning about `output_format=` on the parse/stream/tool_runner helpers, cleaning up noise in your beta workflows [2]. Meanwhile, claude-code-action fixed two real headaches: the `mcp__github` aggregate selector now correctly initializes GitHub MCP servers, matching the documented config [3], and `restoreConfigFromBase` no longer leaks a silent config revert into the auto-commit, so your base-branch changes stay safe [4]. There's also a fix to honor `GITHUB_GRAPHQL_URL` for the GraphQL client, which matters for custom proxies and GHES deployments where the GraphQL endpoint isn't derivable from the REST base [5]. Documentation now covers the `[1m]` selector for 1M context on Claude Opus 5 and Sonnet 5 when a gateway blocks native confirmation, but note that the action leaves Claude Code as the source of truth [6]. Finally, the plugin desk saw routine SHA bumps for expo, paypal, stripe, superdesign, and valtown, all validated and safe to merge after a quick scan [7] [8] [9]. Across the boards: 14 commits, 33 PRs, 2 releases. That's the day.

Action items

→ Update anthropic-sdk-python to 1.0.0, but review MIGRATION.md for the httpx2 breaking changes first anthropics/anthropic-sdk-python [plan]
→ Review and merge the claude-code-action fix for `mcp__github` selector to unblock documented GitHub MCP setups anthropics/claude-code-action [immediate]
→ Review the claude-code-action config revert fix to ensure base-branch configs stay clean anthropics/claude-code-action [immediate]
→ Monitor the plugin SHA bumps and merge after scanning anthropics/claude-plugins-official [monitor]

References

[1] v1.0.0 ↗ anthropics/anthropic-sdk-python
[2] fix(beta): stop warning about `output_format=` on the parse/stream/tool_runner helpers anthropics/anthropic-sdk-python
[3] fix(mcp): recognize mcp__github aggregate selector for GitHub MCP server initialization ↗ anthropics/claude-code-action
[4] fix(cleanup): keep the base-branch config revert out of the auto-commit ↗ anthropics/claude-code-action
[5] fix(github): honor GITHUB_GRAPHQL_URL for the GraphQL client ↗ anthropics/claude-code-action
[6] Document 1M gateway models and surface resolved limits ↗ anthropics/claude-code-action
[7] bump(expo): d1c68a21 → 472d0400 ↗ anthropics/claude-plugins-official
[8] bump(paypal): a9c0586f → 310b4962 ↗ anthropics/claude-plugins-official
[9] bump(stripe): 96cfe6bf → e8f9aee6 ↗ anthropics/claude-plugins-official

Quick answers

What shipped in Anthropic on August 21, 2026?: The Python SDK finally hits 1.0.0, but it comes with a breaking change that will require your attention before you upgrade. In total, 14 commits, 33 pull requests, and 2 releases landed.
Who contributed to Anthropic on August 21, 2026?: 10 developers shipped this update, including github-actions, stainless-app[bot], stainless-app, Robert Craigie, ulofiai, anishesg, GautamSharma99, and rover0811, and 2 more.
What were the notable Anthropic updates?: v1.0.0, fix(beta): stop warning about `output_format=` on the parse/stream/tool_runner helpers, and fix(mcp): recognize mcp__github aggregate selector for GitHub MCP server initialization.

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@anthropics Aug 20

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@anthropics Aug 19

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@anthropics Aug 18

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