# attachment/ - durable attachment capability family

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The durable binary attachment seam and its local filesystem implementation. Both are product packages.

| Package | Role | ctx key |
|---|---|---|
| `attachment/` | Immutable attachment references, image limits, and storage service | `ctx.attachments` |
| `attachment-local/` | Content-addressed private storage below `DSH_HOME` | (registers on `ctx.attachments`) |

Unsent browser drafts are intentionally outside this capability. Bytes enter durable storage only when a user prompt is submitted or when a provider adapter commits structured model output.