---
title: "POST /projects/{projectId}/prompts/{promptId}/versions"
method: POST
path: "/projects/{projectId}/prompts/{promptId}/versions"
---

# POST /projects/{projectId}/prompts/{promptId}/versions

`POST /projects/{projectId}/prompts/{promptId}/versions`

## Request

- Base URL: `https://api.caveman.so/api/v1`
- URL: `https://api.caveman.so/api/v1/projects/{projectId}/prompts/{promptId}/versions`
- Auth: one of:
  - OAuth 2
    - Authorization code: `/api/v1/oauth/authorize`
    - Token URL: `/api/v1/oauth/token` scopes: `prompt:write`
  - HTTP bearer
  - API key in cookie `cave_access`
  - API key in cookie `__Secure-cave_identity.session_token`

POST /api/v1/projects/{projectId}/prompts/{promptId}/versions on the Caveman Cloud control plane. Requires the prompt:write scope. Exposed to autonomous agents as the add_version action of the caveman_prompts_write tool (write access). Register prompts, add immutable versions, pin versions, and delete prompts. Author comparisons through Evals.

## Request body

- object
  - `expected_version` integer
  - `commit_message` string
  - `model_defaults` unknown
  - `system_text` string
  - `tags` string[]
  - `tools` object[]
  - `user_text` string
  - `variables` unknown

## Response `2XX`

Successful response. Exact status depends on synchronous or durable delivery outcome.

## Other responses

- `4XX`: Structured failure. `error.code` is stable; `error.request_id` is echoed in the x-cave-request-id header.
- `5XX`: Structured failure. `error.code` is stable; `error.request_id` is echoed in the x-cave-request-id header.

---

[API](https://skmtc.dev/caveman/apis/caveman-cloud-api.md) - [All operations](https://skmtc.dev/caveman/apis/caveman-cloud-api/llms.txt) - [OpenAPI document](https://skmtc.dev/caveman/apis/caveman-cloud-api/revisions/508312d01cfc?raw)