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Binary attachments (images, PDFs, audio, video) referenced from event payloads / input_data via `format: homespun-attachment-id`. ONE tool with an `action` enum: upload | fetch | presign | finalize | download | show | list | delete | mint_token | revoke_token | list_tokens. TOKEN COST, READ FIRST: an inline `upload` with `content_base64` carries the bytes in the tool-call arguments, so they enter the MODEL CONTEXT and cost tokens PROPORTIONAL TO FILE SIZE (a few-hundred-KB image is already very costly, worse on every retry). For ANY real image or media (anything beyond a tiny icon) use a ZERO-CONTEXT path instead: `fetch` when you have a URL (the relay downloads it server-side, you send only the URL string), or presign + finalize when the client can PUT the raw bytes out-of-band. fetch: { source_url (https), scope } — the relay downloads the URL itself behind an SSRF guard (https only, no private/loopback/metadata hosts, DNS pinned, redirects refused, size-capped, timed out) and runs the same byte-sniff + allowlist + size + quota + scan checks as any upload; works on any storage backend. upload (inline) takes EITHER `content_base64` (base64 bytes, no filesystem; last-resort for small assets or clients with neither a URL nor an out-of-band PUT) OR `file_path` (ABSOLUTE path read on the RELAY host, only usable when the file is local to the relay). presign + finalize (token-free, for images/video/big audio): (1) presign with { mime, size, sha256, scope } returns { put_url, attachment_id }; (2) YOU PUT the raw bytes to put_url over plain HTTP out-of-band; (3) finalize with the attachment_id. At finalize the relay re-reads the stored bytes, BYTE-SNIFFS the real type, and enforces the same allowlist + size + sha256 + quota + scan checks as any upload, so a presign that lies about its mime is caught and never served inline. The presigned path requires the Azure storage backend; a filesystem self-host returns a clear not-supported error (use fetch or inline upload there). download writes to an ABSOLUTE out_path (or returns base64). Scope an upload to agent (default, reusable) or app. mint_token returns a /b/<token> capability URL (ONCE) a browser can GET without your API key.

Get the signed contract PDF as a base64-encoded download. PDF includes the contract, signature certificate, and any signed amendments. Returns { filename, contentType, base64 }. Errors with conflict:contract_not_signed if the parent contract has not been signed yet.