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The Wire · Showcase

CLAUDE AGENT SDK FIXES STDIN CLOSURE BUG IN BACKGROUND TASKS

By RepoJournal · Filed · About Anthropic

github-actions[bot] GitHub Actions ashwin-ant
3 people shipped this
github-actions[bot] @github-actions[bot] 2 cited GitHub Actions @actions-user 2 cited ashwin-ant @ashwin-ant 1 cited

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.

Claude Agent SDK v0.2.127 ships a critical fix for stdin handling in background tasks [1], addressing a bug where closing stdin too early caused SDK-MCP tool calls from background subagents to fail with stream closure errors and skip PreToolUse hooks. The fix keeps stdin open until all in-flight tasks complete and the final result frame arrives [1]. Both the Agent SDK and Claude Code are rolling forward together: v0.2.128 bundles the latest Claude CLI v2.1.220 [2], while Claude Code v2.1.219 introduces Claude Opus 5 as the default Opus model with 1M context and adds a new sandbox network allowlist setting for stricter host controls [3]. The Claude Code Action and its base syncs now track both Claude Code and Agent SDK bumps, keeping all three components in lockstep [ref:8, ref:10].

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Action items

References

  1. [1] v0.2.127 ↗ anthropics/claude-agent-sdk-python
  2. [2] v0.2.128 ↗ anthropics/claude-agent-sdk-python
  3. [3] v2.1.219 ↗ anthropics/claude-code
  4. [4] chore: bump Claude Code to 2.1.220 and Agent SDK to 0.3.220 anthropics/claude-code-action
  5. [5] Sync from claude-code-action base-action@be7b93b anthropics/claude-code-base-action

Quick answers

What shipped in Anthropic on July 25, 2026?
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. In total, 10 commits and 6 releases landed.
Who contributed to Anthropic on July 25, 2026?
3 developers shipped this update, including github-actions[bot], GitHub Actions, and ashwin-ant.
What were the notable Anthropic updates?
v0.2.127, v0.2.128, and v2.1.219.

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