In late 2025, Perplexity’s Comet browser began logging into shoppers’ Amazon accounts and buying on their behalf. Amazon treated it as an intruder. It blocked the agent and when Perplexity slipped past the block within a day, Amazon took the dispute to federal court. WeChat drew the line differently. After shutting out ByteDance’s Doubao assistant, which used system-level access to navigate WeChat without permission, Tencent later opened what it describes as an agent-to-agent channel to selected assistants from Huawei, Xiaomi, and others to send messages and place calls. Under this arrangement, an external agent translates a user’s request into a structured instruction and passes it through a Tencent-controlled interface to WeChat, which executes the action inside its own environment. Tencent controls which agents can connect, which functions they can invoke, and what data and execution remain inside WeChat. In other words, one platform shut the door to AI agents outright; the other unlocked it on its own terms.

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