diff --git a/migrations/100_rls_and_grants.sql b/migrations/100_rls_and_grants.sql
index f1dabac..fa7d2f1 100644
--- a/migrations/100_rls_and_grants.sql
+++ b/migrations/100_rls_and_grants.sql
@@ -35,4 +35,8 @@ GRANT ALL ON TABLE public.agent_skills TO amcs;
 GRANT ALL ON TABLE public.project_skills TO amcs;
 
 GRANT ALL ON TABLE public.project_guardrails TO amcs;
+
+-- Chat Histories (018)
+GRANT ALL ON TABLE public.chat_histories TO amcs;
+
 GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO amcs;
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