What
Settings files now accept additionalMarketplaces as an alias for extraKnownMarketplaces, read exactly the same way.
Details
- If a single file sets both keys, the alias is ignored and a warning is printed.
- Claude Code may rewrite the alias to the canonical spelling next time it updates the file.
- Older clients ignore the alias entirely, so the canonical key is still the safe choice for shared configs.
Evidence
additionalMarketplaces
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Names in the bundleadditionalMarketplacesextraKnownMarketplaces
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's release notes agree
Settings: additionalMarketplaces and allowedMarketplaces are now accepted as friendlier aliases for extraKnownMarketplaces and…
The name it cites is new in this build
New in this build: additionalMarketplaces