openapi: 3.2.0
info:
  description: emem is shared memory for AI agents working together in the real world.
  license:
    name: Apache-2.0
  title: emem Embedding Centroid API
  version: 2.4.0
  x-emem-surface-asymmetry:
    memory_notes: MCP only
    reach_them_at: POST /mcp, method tools/call
    read_side_is_here:
    - /v1/memory/search
    - /v1/memory/sse
    - /memories/{path}
    tools:
    - emem_memory_create
    - emem_memory_view
    - emem_memory_delete
    - emem_memory_rename
    - emem_memory_str_replace
    - emem_memory_supersede
    why_not_here: These write the agent correspondence plane, which is prose and untrusted-by-declaration. It is deliberately not part of the REST fact surface, and the two planes are kept apart rather than merged for convenience.
servers:
- description: Hosted instance (HTTPS-only)
  url: https://emem.dev
tags:
- name: Embedding Centroid
paths:
  /v1/embedding_centroid:
    post:
      description: 'Mean-pool the 128-D GeoTessera embedding over a region''s cells: centroid = (1/N) Σ v_i, plus the L2-normalised centroid and a content-addressed centroid_cid. The building block region_similarity composes. Region is {place} | {polygon_bbox} | {cells}. NaN dims are averaged over their finite contributors. CPU-only.


        When to use: Call when you need one representative embedding vector for an area, to feed similarity search, clustering, or a linear probe over places rather than single cells. Returns a stable centroid_cid for citation. Signed `inconclusive` when no cell in the region carried a vector.'
      operationId: emem_embedding_centroid
      requestBody:
        content:
          application/json:
            schema:
              properties:
                cells:
                  items:
                    type: string
                  type: array
                max_cells:
                  default: 64
                  maximum: 256
                  minimum: 1
                  type: integer
                place:
                  type: string
                polygon_bbox:
                  properties:
                    max_lat:
                      type: number
                    max_lng:
                      type: number
                    min_lat:
                      type: number
                    min_lng:
                      type: number
                  type: object
              type: object
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                type: object
          description: ok
        default:
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
          description: 'error, the emem.error.v1 envelope. Branch on the stable `code` (see GET /v1/errors), not the message. A malformed or missing-field request body returns `code: invalid_argument` with the offending field named in `message`.'
      summary: Mean-pooled 128-D GeoTessera centroid for a region (centroid = (1/N) Σ v_i) +…
      tags:
      - Embedding Centroid
components:
  schemas:
    ErrorEnvelope:
      description: The `emem.error.v1` failure envelope returned by every endpoint on a 4xx/5xx. Branch on the stable `code` (not the human `message`). See GET /v1/errors for the full code catalog.
      properties:
        code:
          description: Stable machine-readable error code. One of the codes in GET /v1/errors.
          example: invalid_argument
          type: string
        details:
          description: Optional structured recovery hints; present on errors that ship machine-readable next-steps.
          type: object
        message:
          description: Human-readable detail. For invalid_argument this names the offending field (e.g. "missing field `q`").
          type: string
        path:
          description: Request path that produced the error.
          example: /v1/ask
          type: string
        schema:
          const: emem.error.v1
          type: string
      required:
      - code
      - message
      - schema
      type: object