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Let's say I have an aligned agent, and I want to give it access to my bank account to track my budget, and my email so it can automate responses to certain messages, and automatically unsubscribe from junk emails.

Nether service has a way to configure fine-grained access for a secondary user.

How do I go about giving the agent the ability to perform these tasks without exposing myself to the risk of unexpected destructive behavior from the agent?

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Those are API things. Should be an API, build an MCP server for it. Doesn't touch the PC. About the automated responses, that's a write operation, therefore requires user consent.

If you want to design a system specifically to make sure you're not going to get stonewalled for sending me an emdash, you build and maintain a set of permissive rules for sending/reading to avoid my blacklist of people I'll never work with.

Once you got API stuff sorted, just throw a cronjob at it or build a service for that stuff.

^ There be prompts all over the place here, obviously. Realistically your MCP server will end up hacking on POP3.

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