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POST
Start a session

Authorizations

Authorization
string
header
required

Secret key (sk_live_...)

Headers

Idempotency-Key
string

Optional key that makes the request idempotent. Retrying with the same key returns the original response instead of repeating the operation; keys expire after 24 hours. Any string up to 256 characters. See Idempotency.

Maximum string length: 256
Example:

"550e8400-e29b-41d4-a716-446655440000"

Response

Created

A session object representing an isolated compute session for executing tasks.

id
string
required

Unique identifier for the session, prefixed with sess_.

Pattern: ^sess_
Example:

"sess_AbC123xYz456"

object
string
required

Always session.

status
string
required

Session status: queued, running, idle, completing, completed, or failed.

runtime_ms
required

Total session runtime in milliseconds.

task_runs
object[]
required

Task runs executed within this session.

created_at
string<date-time>
required

ISO 8601 timestamp of when the resource was created.

Example:

"2026-08-24T12:00:00Z"

updated_at
string<date-time>
required

ISO 8601 timestamp of when the resource was last updated.

Example:

"2026-08-24T12:00:00Z"

request_id
string
required

Unique identifier for the API request. Include this when contacting support.