Signal users who want to use it with their agents are running an unofficial extracted-and-patched `signal-cli` off GitHub. It's based on an archived official Signal repo and then patched for years by some random accounts. It looks incredibly untrustworthy.

Meanwhile Telegram has bot support and added features specifically for interacting w/agents. It's incredibly easy to write clients and work with it. No one should use it, and I never would, but you can see why it's winning.

Signal's lack of features (like an official Signal CLI) and bots (even attached to existing phone numbers and limited to the owner) is making people less secure than they could be. And unfortunately there are no great alternatives.