The Agent Command Center is easy to mistake for a list of chats with agents: open it, read the thread, close it. That is the first error of scale. In Devin Desktop 2.0 the Command Center is a Kanban management surface that gathers local and cloud sessions into columns by status, and its job is not to store conversations but to show where a human decision is needed right now. As long as you see a feed of chats in it, you are using a queue of decisions as a messenger.
The naive move from here is understandable: since you can launch many agents, launch many - the board will take it, and you will sort it out later. The tool plays along: starting a new session is cheap, it holds any number of cards, and for a while it feels as if the growing number of active agents is itself a growth in productivity. The feeling is deceptive precisely because the cheapness of launching says nothing about the cost of verification.
It breaks on the fact that the board is built around status, not around dialogue. The documentation describes the column layout directly: agents are organized so that at a glance you can tell what is in flight, what needs your attention and what is finished. So the bottleneck of the process is not how many sessions are running but how many of them stand at once in the waiting column and require a decision only you can make. The board visualizes exactly this: a queue of human decisions, not a list of machine conversations.
The professional mechanism here is to treat the board as a queue, not a collection. While an agent works, the session is locked: it is greyed out and read-only until the agent finishes - that is, you cannot cut into the middle of a turn, and this is protection against the illusion of control. But a message can be queued and edited before it is sent (in Devin Local), and the session itself can be duplicated to test an alternative without losing the original. The sidebar filters, sorts and groups sessions per workspace, grouped Spaces keep a sticky header, and renaming is a double-click. None of this is a tool for talking; all of it is dispatch.
Why this way rather than one tab per conversation. An agent works asynchronously and for a long time, and keeping a tab per conversation is pointless: you do not watch every character anyway. A single native OS notification arrives when a session finishes or needs input - and it is that, not a constant gaze into the window, that brings you back to the right card at the right moment. The board exists so that you do not guard agents but come to them on a signal. That is why the Command Center does not try to replace the editor: having dealt with a card, you return to the code for manual refinement, while the board stays a dispatch desk, not a workplace.
The cost of ignoring this distinction is concrete and has a simple name: concurrency without review capacity. Launching ten agents is easy; accepting ten finished results with the same care you give to one is not. Each unaccepted but finished card is not completed work but a deferred risk: an unverified diff that one day you will either have to untangle or merge blindly. A warehouse of such cards is the real cost of excessive parallelism.
Parallelism is justified exactly up to the limit of your ability to verify. A reasonable number of simultaneously active tasks is not how many agents the machine can pull, nor how many columns fit on the screen, but how many results you can properly close in this window of time. Below the limit the board saves switching and holds the whole picture; above it, it turns into a quietly growing debt.
You should judge the board's usefulness not by the number of active sessions but by the state of the waiting column. A healthy process is one where cards do not linger in the attention column but pass into review and close at the pace you can read them. The sign of illness is the reverse: the finished column swells while you keep launching new work. One glance at that column is more honest than any productivity counter.
Hence a working technique: every card should have the name of a result, not the name of a session. The line API pagination regression says which decision is expected from you; New session says nothing and forces you to open the conversation to recall what it is about. A result-name turns the board into a readable queue where priority is visible without going inside. This is an engineering technique, not a product requirement: the system allows any name, you are the one who makes it useful.
The typical failure is to measure success by the number of launched agents and be surprised that everything is in progress and nothing is done. The symptom is usually one: the waiting column and the finished column grow faster than you clear them, and new sessions are named identically and indistinguishable. Before adding one more agent, look at how many decisions already wait for you on the board - most often productivity is there, in closing the queue, not in lengthening it.