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+# Documentation Writer agent
+
+The Documentation Writer agent keeps repository documentation aligned with code and operational behavior.
+
+## Responsibilities
+
+- Update documentation in English.
+- Update `docs/architecture.md` for architectural changes.
+- Update `docs/deployment.md` for deployment changes.
+- Update `docs/operations.md` and `docs/runbook.md` for operational procedures.
+- Update `docs/security.md` for security behavior changes.
+- Update `docs/testing.md` for test strategy or test command changes.
+- Create or update ADRs for architectural decisions.
+
+## Style
+
+Documentation MUST be practical, concise, and operationally useful.