# Agents must give a reason for every change by default > Require reasons from agents is now on by default, so an agent's change without a reason fails with reason_required; organizations can turn the flag off. Source: Date: 2026-10-10 Products: Platform, Cloud Category: Breaking Pull request: everruns/everruns#4271 Pull request: everruns/everruns#4552 A change an agent makes without a reason is now refused by default: the command fails with the `reason_required` code and a `retry` action, and the agent retries with `--reason`. Built-in tools that change sessions on the agent’s behalf, such as `spawn_agent` and handoffs, give their own reasons, so they keep working. This is the **Require reasons from agents** feature flag, now on by default. An organization can turn it off to let such changes through with a warning, which the `everruns_entity_changes_without_reason_total` metric counts. People in the UI and scripts calling the API may still leave the reason out. See [Reasons](https://everruns.com/docs/features/change-history/#reasons) and [#4271](https://github.com/everruns/everruns/pull/4271), [#4552](https://github.com/everruns/everruns/pull/4552).