Permission Defaults
Secure default configuration in agent SDKs that follows the principle of least privilege. New projects receive only the minimum necessary permissions by default, and teams must explicitly declare the capabilities they require.
Timeline (last 90 days)
The updates to the Claude Agent SDK in the second half of 2026 focus on five areas: nested sub-agents (with quantity limits), SessionStore, skills, plugins, and structured output plus permission defaults.
The Claude Agent SDK's permission defaults follow the principle of least privilege: newly created agents by default have only minimal tool access, and teams must explicitly declare the capabilities they need.
The official descriptions of the Claude Agent SDK's limits on nested sub-agents and the specific rules for permission defaults are relatively general; before adopting them in production, you should consult the detailed documentation for the corresponding version and rely on actual test results.
Changes to permission defaults usually affect newly created configurations, and existing projects should verify that explicit permission declarations are complete when upgrading.
All Facts (4)
The updates to the Claude Agent SDK in the second half of 2026 focus on five areas: nested sub-agents (with quantity limits), SessionStore, skills, plugins, and structured output plus permission defaults.
50%UnverifiedThe Claude Agent SDK's permission defaults follow the principle of least privilege: newly created agents by default have only minimal tool access, and teams must explicitly declare the capabilities they need.
50%UnverifiedThe official descriptions of the Claude Agent SDK's limits on nested sub-agents and the specific rules for permission defaults are relatively general; before adopting them in production, you should consult the detailed documentation for the corresponding version and rely on actual test results.
50%UnverifiedChanges to permission defaults usually affect newly created configurations, and existing projects should verify that explicit permission declarations are complete when upgrading.
50%