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CLAUDE SDK ROLLS OVERLOAD DETECTION AND SESSION RESUME CONTROLS

By RepoJournal · Filed · About Anthropic

TypeScript Agent SDK v0.3.223 ships structural 529 overload detection and a new resumeDropsTurn safety valve for session truncation, while the Python SDK and Code Action synced their bundled CLI versions overnight.

The TypeScript SDK now returns `api_error_status: 529` in result messages for repeated overload failures [1], letting consumers detect API saturation without parsing message text. Same release adds `resumeDropsTurn` to declare which turn a truncating resume intends to drop, with the CLI refusing the resume if anything else would be discarded [1]. Bare headless queries without tool access now emit `system/permission_denied` stream events for structural permission detection [1]. The Python Agent SDK bumped its bundled Claude CLI to 2.1.223 [4], and Claude Code Action v1.0.186 flipped its formatter from invoking `bun run format` to calling `bunx prettier@3.5.3 --no-config` directly [2], ensuring consistent output regardless of repo-level scripts and prettier config. This sidesteps a potential security vector where a checked-out tree's package.json could override the pinned formatter version [3]. Code Action also documented which paths the action restores [3]. The base action repo synced these changes in kind [5].

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Action items

References

  1. [1] v0.3.223 ↗ anthropics/claude-agent-sdk-typescript
  2. [2] v1.0.186 ↗ anthropics/claude-code-action
  3. [3] Invoke the formatter directly from the format hook (#1594) anthropics/claude-code-action
  4. [4] v0.2.131 ↗ anthropics/claude-agent-sdk-python
  5. [5] Sync from claude-code-action base-action@c038e4d anthropics/claude-code-base-action

Quick answers

What shipped in Anthropic on August 6, 2026?
TypeScript Agent SDK v0.3.223 ships structural 529 overload detection and a new resumeDropsTurn safety valve for session truncation, while the Python SDK and Code Action synced their bundled CLI versions overnight. In total, 6 commits, 1 pull requests, and 3 releases landed.
Who contributed to Anthropic on August 6, 2026?
3 developers shipped this update, including github-actions[bot], GitHub Actions, and Ashwin Bhat.
What were the notable Anthropic updates?
v0.3.223, v1.0.186, and Invoke the formatter directly from the format hook (#1594).

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