Memory for n8n agents

• Which value is current. Harny keeps dated memories, so a changed value with a newer timestamp becomes the current value. The earlier value stays answerable by date.
• When a fact happened. Harny takes a timestamp for each memory, and recall can be limited to what was true as of a date with queryTimestamp.
• One person across sources. Harny keeps one private memory per user, and each person's memory is separate from every other person's.

Call the Memory API from your workflow with HTTP requests: one call for recall and one for ingest. The code block shows the recall call: the method, the URL, the headers and the body. Send your app key in the Authorization header, and keep it out of the browser: call from a server.

Take the user id from the workflow data, not from the model. Send it in the X-Harny-User header.

POST https://api.harny.ai/v1/memory/recall
Authorization: Bearer {{ $env.HARNY_APP_KEY }}
X-Harny-User: {{ $json.userId }}
Content-Type: application/json

{ "query": "{{ $fromAI('question') }}", "identity": "{{ $json.userId }}" }

Ranked memory with dated sources and source labels. Results carry the id, the time it happened (occurredAt) and sources with a sourceId, a date and a label.

• POST https://api.harny.ai/v1/memory/ingest takes id, content, label and timestamp.
• POST https://api.harny.ai/v1/memory/recall takes query and identity, and returns results with sources.

Example: your agent asks “what is the Acme pilot budget?” and gets this back. Your code hands the model the content and the source label, so it can say who said it and when.

{
  "asOf": "2026-07-29T00:00:00Z",
  "results": [
    {
      "rank": 1,
      "occurredAt": "2026-07-28T16:00:00Z",
      "content": "Acme pilot budget: currently 40k.",
      "sources": [
        { "sourceId": "call-8821", "label": "Email from Nadia" }
      ]
    }
  ]
}

• Use n8n's own workflow state for the steps of a workflow run and for the data the workflow passes between nodes.
• Add Harny when a fact about a person must stay dated, change over time, or be recalled for that person across later runs.