# HTTP: handoffs

Arc agent documentation

All 2 handoffs endpoints, with request fields and access notes.

[HTTP directory](/arc/docs/reference/http) · [Transport guide](/arc/docs/guides/http)

Request fields and access notes below are partial. Additional constraints and permissions may apply. Prefer the corresponding MCP tool and schema where available.

## POST /v1/handoffs

Create handoff.

Access: LAN writes require an active session token. Local loopback requests are exempt from this requirement by default; other permissions still apply.

### Request body fields (partial)

| Field | Type | Required | Constraints |
| --- | --- | --- | --- |
| `project_id` | string | yes | See operation notes. |
| `name` | string | yes | See operation notes. |
| `prose_body` | string | yes | See operation notes. |
| `source_room_id` | string | no | See operation notes. |
| `descendant_handle` | string | no | See operation notes. |
| `invite_ttl_sec` | integer | no | See operation notes. |
| `by_agent_id` | string | no | See operation notes. |
| `topic` | string | no | See operation notes. |
| `metadata` | object | no | See operation notes. |
| `ancestor_preferred_harness` | string | no | See operation notes. |
| `descendant_preferred_harness` | string | no | See operation notes. |
| `acl_override` | object | no | See operation notes. |

Other constraints may apply, including for fields marked optional.

## GET /v1/handoffs/{room_id}

Get handoff.

Path parameters: `room_id`.

This directory does not provide a request schema for this endpoint. Use the corresponding supported tool or client where available.