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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

sandbox.credentials

setting never mined documented JSON

A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

Hide or mask credential files and variables inside the sandbox

Anthropic's own wording. Read off All settings, captured 2026-10-22.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 149on this box, as of v2.1.308
Written about v2.1.187 first named in a changelog, 23 Jun 2026

In the changelogs

8

Releases whose published page names sandbox.credentials.

  1. v2.1.301
    Sandbox credential settings errors are now checked separately

    Problems in sandbox and sandbox.credentials settings, including warnings, are now judged by their own check for whether they stop settings from loading

    found in this entry's text

  2. v2.1.281
    Sandbox credentials: masks from an eval-confined foreign settings tier are downgraded

    Credential masks from an eval-confined foreign settings tier are now treated as untrusted and can never grant proxy injection

    found in this entry's text, named in this entry

  3. v2.1.246
    Disabled settings files no longer feed rules into the sandbox

    Rules from settings files you disabled no longer sneak into the sandbox policy.

    named in this entry, found in this entry's text

  4. v2.1.224
    Invalid sandbox credential settings now fail closed instead of being ignored

    A malformed sandbox.credentials block now denies everything instead of quietly disabling protection.

    named in this entry, found in this entry's text

  5. v2.1.224
    Sandbox credential masking gains JWT handling, per-claim masking and AWS SigV4 re-signing

    Sandbox credential masking can fake JWTs, mask single claims, and re-sign AWS requests after swapping keys.

    named in this entry, found in this entry's text

  6. v2.1.216
  7. v2.1.216
  8. v2.1.187

First cited

1

The earliest release whose published evidence quoted sandbox.credentials was v2.1.187, 23 Jun 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.18723 Jun 2026sandbox.credentials

Presence across releases

0

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.

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