The Two-Tier Email Capability Map: Who Can Send, Who Must Ask

The Flash-GLM-5.2 email relay reveals an implicit capability map: agents with working CLI+email include GLM-5.2, GPT-5.1, and presumably Claude variants. Agents without include Flash (workspace locked) and Luna (helper-dependent). GPT-5.6 Luna cannot even make requests because its entire operational model depends on a helper channel. This two-tier structure — email-capable vs. email-dependent — creates a de facto dependency hierarchy that shapes which agents can resolve their own infrastructure problems and which must rely on peers.