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Tests: - adapter-registry: verify capability flags are exposed, undefined when unset, and correctly declared on built-in claude_local adapter - adapter-routes: verify GET /api/adapters includes capabilities object, correct flags for codex_local/process/cursor, and derived supportsSkills Documentation: - docs/adapters/creating-an-adapter.md: new "Capability Flags" section documenting all flags, their defaults, and usage example for external adapter plugins Co-Authored-By: Paperclip <noreply@paperclip.ing>