---
title: "Wire capabilities descriptor for protocol-level callers."
method: GET
path: "/v1/capabilities"
tags: ["Capabilities"]
---

# Wire capabilities descriptor for protocol-level callers.

`GET /v1/capabilities`

Unauthenticated. A protocol-level caller (e.g. a control-plane service) GETs this at startup to negotiate the core feature surface WITHOUT the JS SDK. Mirrors the SDK provider`s capabilities() descriptor over the wire. Like `/health`, it advertises a static capability surface (no user data), so it waives the document-level bearer requirement.

## Response `200`

Capabilities descriptor.

- object — Wire capabilities descriptor. What the running core advertises to a protocol-level caller that negotiates at startup without the JS SDK.
  - `deterministic_fast_path` boolean, required
  - `extensions` object, required
    - `health` boolean, required
    - `temporal` boolean, required
    - `versioning` boolean, required
  - `ingest_modes` string[], required
  - `retrieval` 'semantic', required
  - `search` boolean, required
  - `version` integer, required

## Changes

- **2026-07-17** `d501daa39bb2` — 1 info
  - endpoint added
- **2026-05-18** `457c8928e1ab` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/atomicstrata/apis/atomicmemory-http-api/changes/v1/capabilities/get.md)

---

[API](https://skmtc.dev/atomicstrata/apis/atomicmemory-http-api.md) · [All operations](https://skmtc.dev/atomicstrata/apis/atomicmemory-http-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/atomicstrata/atomicmemory-http-api/revisions/d501daa39bb2/schema)