Add Session Resource

beta.sessions.resources.add(session_id, **kwargs) -> BetaManagedAgentsFileResource

POST/v1/sessions/{session_id}/resources

Parameters

session_id: String

file_id: String

ID of a previously uploaded file.

minLength1

maxLength128

type: :file

mount_path: String

Mount path in the container. Defaults to /mnt/session/uploads/<file_id>.

minLength1

maxLength4096

betas: Array[AnthropicBeta]

Optional header to specify the beta version(s) you want to use.

One of the following:

String = String

AnthropicBeta = :"message-batches-2024-09-24" | :"prompt-caching-2024-07-31" | :"computer-use-2024-10-22" | 38 more

One of the following:

:"message-batches-2024-09-24"

:"prompt-caching-2024-07-31"

:"computer-use-2024-10-22"

:"computer-use-2025-01-24"

:"pdfs-2024-09-25"

:"token-counting-2024-11-01"

:"token-efficient-tools-2025-02-19"

:"output-128k-2025-02-19"

:"files-api-2025-04-14"

:"mcp-client-2025-04-04"

:"mcp-client-2025-11-20"

:"dev-full-thinking-2025-05-14"

:"interleaved-thinking-2025-05-14"

:"code-execution-2025-05-22"

:"extended-cache-ttl-2025-04-11"

:"context-1m-2025-08-07"

:"context-management-2025-06-27"

:"model-context-window-exceeded-2025-08-26"

:"skills-2025-10-02"

:"fast-mode-2026-02-01"

:"output-300k-2026-03-24"

:"user-profiles-2026-03-24"

:"user-profiles-2026-08-18"

:"advisor-tool-2026-03-01"

:"managed-agents-2026-04-01"

:"cache-diagnosis-2026-04-07"

:"dreaming-2026-04-21"

:"thinking-token-count-2026-05-13"

:"server-side-fallback-2026-06-01"

:"server-side-fallback-2026-07-01"

:"fallback-credit-2026-06-01"

:"fallback-credit-2026-07-01"

:"agent-memory-2026-07-22"

:"mid-conversation-tool-changes-2026-07-01"

:"compact-2026-01-12"

:"computer-use-2025-11-24"

:"mcp-tunnels-2026-06-22"

:"structured-outputs-2025-11-13"

:"task-budgets-2026-03-13"

:"thinking-display-updates-2026-08-18"

:"ce-user-management-2026-07-13"

Returns

class BetaManagedAgentsFileResource { id, created_at, file_id, 3 more }

id: String

created_at: Time

A timestamp in RFC 3339 format

formatdate-time

file_id: String

mount_path: String

type: :file

updated_at: Time

A timestamp in RFC 3339 format

formatdate-time

Add Session Resource

require "anthropic"

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")

beta_managed_agents_file_resource = anthropic.beta.sessions.resources.add(
  "sesn_011CZkZAtmR3yMPDzynEDxu7",
  file_id: "file_011CNha8iCJcU1wXNR6q4V8w",
  type: :file
)

puts(beta_managed_agents_file_resource)

{
  "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht",
  "created_at": "2026-03-15T10:00:00Z",
  "file_id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "mount_path": "/uploads/receipt.pdf",
  "type": "file",
  "updated_at": "2026-03-15T10:00:00Z"
}

Returns Examples

{
  "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht",
  "created_at": "2026-03-15T10:00:00Z",
  "file_id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "mount_path": "/uploads/receipt.pdf",
  "type": "file",
  "updated_at": "2026-03-15T10:00:00Z"
}