---
title: "List Activity Types"
method: GET
path: "/audit/v3/activity-types"
tags: ["Audit"]
---

# List Activity Types

`GET /audit/v3/activity-types`

Returns the list of all auditable activity types. Use this to understand what actions are tracked and to build filters when querying audit entries.

## Response `200`

Successful response

- ActivityTypeList — A list of known activity types
  - `activity_types` ActivityType[], required
    - `resource_type` string, required
    - `action` string, required
    - `description` string, required

## Other responses

- `400` — The request failed due to a client error, with one or more of the following possible causes: 1. The request required a tenant_id field, which was missing. 2. The request was malformed syntactically or semantically.

## Changes

> 44 revisions in range; 1 could not be searched.

- **2026-02-12** `f012ca496aa8` — 2 info
  - api tag `Audit` added
  - api tag `audit` removed

[Change history](https://skmtc.dev/hiddenlayerai/apis/hiddenlayer-audit-api/changes/audit/v3/activity-types/get.md)

---

[API](https://skmtc.dev/hiddenlayerai/apis/hiddenlayer-audit-api.md) · [All operations](https://skmtc.dev/hiddenlayerai/apis/hiddenlayer-audit-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/hiddenlayerai/hiddenlayer-audit-api/revisions/d8c55b669109/schema)