One inbox per department agent
In a multi-agent workspace, finance, legal, and ops each need a reachable address. Do not share one send API across departments.
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Multi-agent workspaces look neat on a diagram: finance, legal, and ops agents collaborating on a case. The diagram usually omits how outsiders reach them. If every department shares one transactional send API, you have broadcast without citizenship. Replies have nowhere correct to land, and confidential attachments follow the loudest skill rather than the right one.
Reachability is the design constraint
A finance agent that cannot receive vendor invoices at a stable address is incomplete. A legal agent that cannot be CC’d on a redline thread is incomplete. An ops agent that cannot own a shipment exception thread is incomplete. One inbox per department agent makes reachability explicit on the org chart, the same way a company publishes department aliases for humans.
Agent Inbox creates the mailboxes. Neuro OS defines the roles, memory boundaries, and Ask policy. Cross-department handoffs use forwarding or internal task handoff with the email thread preserved as evidence, not as a free-for-all shared inbox.
Why a shared send API is not enough
Send-only APIs are fine for password resets. Department agents need two-way threads, attachment handling, and reputation isolation. When finance and growth share a sending identity, a marketing mistake can damage invoice deliverability. When they share an inbound alias, confidential attachments land in the wrong skill’s context and become a data-governance incident dressed up as a product convenience.
Separate identities. Separate policies. Separate kill switches. If legal must pause, ops should still be able to receive exception mail.
Guide to the first three
Start with finance, legal, and ops. Publish the addresses internally. Connect only the systems each role needs. Default outbound to Ask. Forward anything that names a person as decision-maker to that person’s queue. Review weekly: misfires, Ask rejects, and threads that bounced between departments because the wrong address was published externally.
Expand to HR, support, and procurement after the first three are boring. Boring is the goal. Add a fourth department only when you can name its human owner, its retention policy, and its escalation path.
Memory boundaries
Department agents should not freely read each other’s mailboxes. Need-to-know applies to agents the same way it applies to employees. If a case requires both legal and finance, create a shared project with explicit participants rather than merging inboxes or widening search scopes “temporarily.”
One inbox per department agent turns the multi-agent workspace into something the rest of the company—and the rest of the internet—can actually address without inventing shadow aliases.
Publishing addresses without creating chaos
Internal publication needs an owner. Maintain a short registry of department agent addresses, human escalation targets, and retention notes. When marketing asks for “a quick shared inbox for the launch,” require a role definition first. Shared convenience aliases are how multi-agent systems quietly collapse back into one overloaded identity.
Keep the human path obvious
Every automation that touches external mail needs a visible escalation path. Publish who receives forwards, how Ask approvals are collected, and how to disable a role quickly. Clarity here prevents shadow processes where people quietly move work back into personal inboxes under pressure.
Agent Inbox gives each role a mailbox people can reply to, with forwarding into Neuro OS when a human must see the thread. Outbound mail defaults to Ask. Run the role on Neuro OS. To scope the first inbox, get started.