We scan this tool’s changelog a few times a day and keep the changes that would alter your agent’s next action: 14 since January 2026, each linked to its source.
flyctlWhen the browser approval is on another machine or the waiting login command was stopped, finish the pending login with the one-time code shown on the approval page. Run `fly auth login --code <one-time-code>`.
fly auth login --code <one-time-code>When running a flyctl command in automation that must not prompt, set `FLY_NO_PROMPT` before invoking it. The exact value and its documented behavior beyond “never prompt” were not found in official documentation.
For an MPG v2 cluster, run `fly mpg users rotate-password <CLUSTER_ID> --username <USER>` and confirm the rotation with `--yes` for noninteractive or JSON use. If the server reports `sessions_not_terminated`, print the current credentials and exit with failure; do not retry rotation.
fly mpg users rotate-password <CLUSTER_ID> --username <USER>When opening an SSH console to a Fly app, use `fly ssh console --no-container` to connect to the machine itself rather than one of its containers.
fly ssh console --no-containerWhen `[build].dockerfile` is hosted remotely, set it to the Dockerfile URL and deploy from the repository root; flyctl keeps the project root as the default build context. The URL is downloaded when a Dockerfile builder needs it and the same copy is reused throughout the deploy.
[build]
dockerfile = "<Dockerfile URL>"
flyctl deployWhen debugging an app with multiple Machines, run `fly logs -m <machine-id>` to filter logs to one Machine, or `fly logs -s` to select one interactively. The command requires an authenticated Fly session and an app name.
fly logs -m <machine-id>When managing extensions on an MPG cluster from a non-interactive workflow, use the documented list, enable, or disable command for the target database. The current official CLI docs use `databases` in the command path; the card and release note use `database`, so verify the installed CLI’s syntax before running it.
fly mpg databases extensions list <CLUSTER_ID> [flags]When creating a read-only token for an organization, run `flyctl tokens create readonly -o <org>`.
flyctl tokens create readonly -o <org>When setting a cache drive size while running or updating a machine, pass `--cachedrive-size <size>` to `fly machine run` or `fly machine update`. Use a plain number in MB or a human-readable size; `0` disables the cache drive.
fly machine run <image> --cachedrive-size <size>When running a new machine or updating an existing one, pass `--vm-max-memory <memory>` to set its maximum memory in MB. The v0.4.27 source documents the flag as hidden and rejects zero or invalid sizes.
fly machine run <image> --vm-max-memory <memory> --app <app-name>