---
title: memhtml session rebase
description: "Move a session's base to its ref's tip, keeping every op. Run it after a `rebase-needed` commit outcome, then commit again."
---

## 1. Synopsis

Move a session's base to its ref's tip, keeping every op. Run it after a `rebase-needed` commit outcome, then commit again.

```sh
memhtml session rebase [options]
```

## 2. Arguments

This command takes no positional arguments.

## 3. Flags

| Flag | Type | Default | Values | Description |
| --- | --- | --- | --- | --- |
| `--id` | string | *no default* | *no fixed set* | The session to rebase. Defaults to $MEMHTML_SESSION; with neither, the call is ERR_MISSING_ARGUMENT. |
| `--server` | flag | `true` | *no fixed set* | Ask the head server on .memhtml/head.sock to rebase onto the tip it holds (`memhtml head serve`), so no head is loaded here; `--no-server` always loads the tip here. The rules are `session commit`'s: the payload is the same either way, `head.source` is `server` and `via` names the path, `server` says why, a 4xx or a decline rebases here, and a 5xx or no answer within `MEMHTML_COMMIT_DEADLINE_MS` fails with ERR_STORAGE rather than rebase again. |

Every command also accepts the [global flags](/reference/global-flags/).

## 4. Response

On success the command writes one JSON envelope to stdout, and its `type` is `session.rebased`.

On failure it writes the failure envelope, whose `code` comes from [error codes](/reference/error-codes/).

[The JSON envelope](/reference/envelope/) gives the fields both shapes carry. [Response types](/reference/response-types/) lists every value `type` takes across the binary.

## 5. Further reading

No guide block names this command. The [guide](/reference/guide/) is the workflow prose the CLI ships beside the command table: which command to reach for, and in what order.

## 6. Provenance

A loader generates this page from `apps/cli/src/commands.ts` while the site builds, so no file in the repository holds it: the `COMMANDS` array there is the one source of argument parsing, of `memhtml manifest`, and of `AGENTS.md`. Change the registry and this page changes with it.