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wire 2026-08-20
stories 18
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CLAUDE CODE 2.1.237 SHIPS CONCISE OUTPUT STYLE AND CRITICAL GIT AUTH FIX

By RepoJournal · Filed · About Anthropic · Composed from the cited sources · methodology

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

Claude Code just got a built-in 'Concise' output style and a long-awaited fix for actions/checkout credential leakage, and one of them is a security patch you should grab before your next CI run.

Claude Code v2.1.237 lands a new built-in 'Concise' output style that the release notes say lets Claude "lead[] with results and skip[] preamble and narration" [1], plus a prompt caching fix for LLM gateway users [1]. But the real headline is in claude-code-action: v1.0.197 fixes a credential leak where configureGitAuth() failed to neutralize the actions/checkout auth header because it edited only the local config, not the separate RUNNER_TEMP file pulled in via include.path [2][3]. This bug, which shipped with actions/checkout v6.0.0 and backports, means CI jobs using Claude Code could expose GitHub tokens to untrusted repos. The fix also landed in v1.0.196 with unified secret redaction in public comments [4]. Meanwhile, v2.1.236 introduced ANTHROPIC_DEFAULT_MODEL and sandbox wildcard read-deny precedence [5], and claude-agent-sdk-python bumped to v0.2.142, bundling CLI 2.1.237 [6]. If you use claude-code-action with actions/checkout v4.3.1 or later, update now.

Action items

References

  1. [1] v2.1.237 ↗ anthropics/claude-code
  2. [2] fix(git-config): neutralize checkout credential in include-based config (#1526) ↗ anthropics/claude-code-action
  3. [3] v1.0.197 ↗ anthropics/claude-code-action
  4. [4] v1.0.196 ↗ anthropics/claude-code-action
  5. [5] v2.1.236 ↗ anthropics/claude-code
  6. [6] v0.2.142 ↗ anthropics/claude-agent-sdk-python

$ ls anthropics/reviews/ # the step-back reads

the week in review Claude Code symlink TOCTOU allows arbitrary file write the month in review Sandbox and SDK holes dominate Anthropic's September
Full archive → Weekly reviews →

Quick answers

What shipped in Anthropic on August 20, 2026?
Claude Code just got a built-in 'Concise' output style and a long-awaited fix for actions/checkout credential leakage, and one of them is a security patch you should grab before your next CI run. In total, 11 commits, 1 pull requests, and 6 releases landed.
Who contributed to Anthropic on August 20, 2026?
4 developers shipped this update, including github-actions[bot], GitHub Actions, Tem Revil, and ashwin-ant.
What were the notable Anthropic updates?
v2.1.237, fix(git-config): neutralize checkout credential in include-based config (#1526), and v1.0.197.
♥

$ log @anthropics --recent

sandbox-runtime fixes a quadratic glob parse, and five projects enroll in OSS Scanner 52 shipped buffa breaks inferred collect() calls, sandbox-runtime fixes the proxy and Linux relays 120 shipped Buffa hardens codegen and descriptor validation, OSS Scanner enrolls WordPress and the AT Protocol stack 26 shipped security-guidance findings reach stderr, and sandbox ignoreViolations types match the CLI 28 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training verl rejects conflicting vLLM engine_kwargs, open-instruct adds MILES OPD behind a Megatron learner Interpretability nnsight 0.8.0 cuts import time from 7.6s to 1.6s

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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