# idempotent on POST /v1/sessions is deprecated

Devin API deprecated POST /v1/sessions, body parameter idempotent without giving a shutdown date yet.

The body parameter idempotent on POST /v1/sessions has been deprecated without a shutdown date. Devin API noted that the legacy idempotent boolean is deprecated. Requests relying on this parameter will eventually fail once it is fully removed.

## What to use instead

Send idempotency_key instead.

- API: Devin API (api.devin.ai)
- Kind: Parameter removal
- Announced: September 11, 2026
- Takes effect: no date given yet
- Calls after that day: fail
- Calls it hits: `POST /v1/sessions`, `body parameter idempotent`
- Source: [Announcement](https://docs.devin.ai/release-notes/overview)
- Verified: November 6, 2026, against Devin API's own pages
- Page: https://www.okapi.bot/providers/devin/breaking-changes/idempotent-on-post-v1-sessions-is-deprecated/

## Devin API's words

> The legacy idempotent boolean is deprecated.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent