Skip to main content
POST
/
api
/
v2
/
lookups
/
segments
/
from-description
Lookup: create a segment from a description
curl --request POST \
  --url https://api.example.com/api/v2/lookups/segments/from-description
Creates a segment from a natural-language description. Used by the Chrome extension’s “Create stream from search” flow. The AI pipeline maps the description to canonical filter labels via the audit-079 auto-approve workflow (LLM-proposed labels are materialized into the controlled vocabulary, then re-mapped, in one call).

​
Body

FieldTypeDescription
descriptionstring (required)Natural-language description, max 1000 chars
trackedAccountIdnumberOptional - assign the new segment to this tracked account via the default-stream chokepoint

​
Response

{
  "segment": {
    "id": 12,
    "name": null,
    "description": "AI founders building developer tools"
  },
  "assignment": {
    "assigned": true,
    "alreadyAssigned": false,
    "position": 0
  },
  "assignError": null
}
assignment is null when trackedAccountId was not supplied. assignError is populated on cap-exceeded / not-found / account-inactive.

​
Errors

CodeHTTPWhen
no_filters_matched400LLM couldn’t extract any filters from the description
cap_exceeded (in assignError)-Tier cap of segments-per-account exceeded

​
Auth

Bearer API key (extension or manual).