You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Agent ProxyArea: what it touches
ImprovementsKind: in v2.1.239,
ImprovementsSection of the release
What
The agent proxy's default list of reachable hosts no longer contains a wildcard for anthropic.com. It now names only api.anthropic.com, api-staging.anthropic.com, api-pr-preview.anthropic.com, mcp-proxy.anthropic.com and mcp-proxy-staging.anthropic.com, plus the package registries. Any other host under anthropic.com is refused unless you allow it explicitly.
Details
The removed entries were anthropic.com, .anthropic.com and *.anthropic.com.
This is the unconditional default list; no gate is involved.
Evidence
mcp-proxy-staging.anthropic.com
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
