---
title: "Experiments Available Columns"
method: POST
path: "/v2/projects/{project_id}/experiments/available_columns"
tags: ["experiment"]
---

# Experiments Available Columns

`POST /v2/projects/{project_id}/experiments/available_columns`

Procures the column information for experiments.

## Path parameters

- `project_id` string, uuid4, required

## Response `200`

Successful Response

- ExperimentsAvailableColumnsResponse
  - `columns` ColumnInfo[]
    - `id` string, required — Column id. Must be universally unique.
    - `label` string, nullable — Display label of the column in the UI.
    - `category` 'standard' | 'metric' | 'user_metadata' | 'metric_status' | 'dataset_metadata' | 'dataset' | 'feedback' | 'tags', required
    - `description` string, nullable — Description of the column.
    - `group_label` string, nullable — Display label of the column group.
    - `data_type` 'uuid' | 'text' | 'integer' | 'floating_point' | 'boolean' | 'timestamp' | 'string_list' | 'tag' | 'dataset' | 'prompt' | 'playground' | 'rank' | 'category_count' | 'score_rating_aggregate' | 'star_rating_aggregate' | 'thumb_rating_aggregate' | 'tags_rating_aggregate' | 'text_rating_aggregate' | 'annotation_agreement' | 'fully_annotated', required
    - `data_unit` 'percentage' | 'nano_seconds' | 'milli_seconds' | 'dollars' | 'count_and_total'
    - `multi_valued` boolean — Whether the column is multi-valued.
    - `allowed_values` unknown[], nullable — Allowed values for this column.
      - unknown
    - `sortable` boolean — Whether the column is sortable.
    - `filterable` boolean — Whether the column is filterable.
    - `is_empty` boolean — Indicates whether the column is empty and should be hidden.
    - `applicable_types` StepType[] — List of types applicable for this column.
    - `is_optional` boolean — Whether the column is optional.
    - `roll_up_method` string, nullable — Default roll-up aggregation method for this metric (e.g., 'sum', 'average').
    - `metric_key_alias` string, nullable — Alternate metric key for this column. When scorer UUIDs are used as column IDs, this holds the legacy metric_name string for dual-key ClickHouse query fallback.

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/galileo/apis/galileo-api-server.md) · [All operations](https://skmtc.net/galileo/apis/galileo-api-server/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/galileo/galileo-api-server/versions/933e8c8e6366/schema)