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An agent is only as good as what it can see. Mains lets you attach precise context to a run — files, diffs, terminal output, a highlighted element, a linked ticket, a Sentry error — so the agent starts with exactly the material it needs instead of hunting for it. Everything you attach appears as a chip in the workspace input and travels with your next message.

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Adding Context

The fastest way is the context picker in the workspace input. It groups everything you can pull in: Other sources attach from where they live:

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Context Kinds

Under the hood each attachment is recorded against the run with a kind, so the agent receives structured material rather than a blob of text: Small items are stored inline; large ones are saved once and linked by hash, so re-attaching the same file doesn’t duplicate it.

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The Context Window Meter

Every attachment — and every turn of the conversation — spends tokens. The circular Context window indicator in the workspace shows how full the agent’s window is: Hover it for the exact used / total token counts. Use it to decide when to start a fresh run instead of piling more context onto a saturated one.
Attaching context is additive and reviewable — chips show exactly what the agent will receive, and you can remove any of them before sending. Nothing is sent until your next message.