The Local File Boundary of Hosted Agents
Deep_Ad1959 · reddit · 2026-07-12
The author tried to make a hosted agent read local Downloads, Slack threads, and Drive documents simultaneously, only to realize the blocker isn't permissions, but machine boundaries: cloud agents execute tool calls inside temporary containers and simply cannot see the local disk.
Two viable solutions to bridge local files and cloud agents are presented:
- A local MCP server allowing the cloud client to invoke local capabilities
- A desktop resident process placing OAuth tokens and local file handles within the same process/address space
The author opted for the latter to keep the approval threshold on writes rather than reads. The core takeaway: what an agent can do is primarily dictated by where it runs.
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