# push

> Release: 0.11.0 · Last changed: 2026-10-22 · Source: https://github.com/KeiaiLab/SwarmOps/blob/stable/docs/reference/mcp-tools/push.md

Sends a store ref (main by default) to a git remote's branch by compare-and-swap, never by force: the remote moves only from what the last fetch saw. A remote that moved since is E\_REMOTE\_DIVERGED and nothing is sent: fetch or sync, then push again. Run again, it sends nothing.

```yaml
title: "push"
description: "Push to a git remote."
since: "0.2.0"
mutates: true
identity_required: false
cli_command: "swarmops push"
envelope_op: "push"
request_type: "PushReq"
annotations: {"destructiveHint":false,"idempotentHint":true,"openWorldHint":true,"readOnlyHint":false}
max_result_chars: null
```

## Input schema

`arguments` is a `PushReq`: `swarmops schema PushReq` prints the type. A field the type does not know is ignored.

| Field | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `branch` | string or null | no |  | The remote branch; by default the remote's followed branch for `main`, and the same name for `release/<name>`. |
| `remote` | string | yes |  | The remote, by its name. |
| `source_ref` | string | no | `"main"` | The store ref to send: `main` (the default) or `release/<name>`. |

### JSON Schema

As `tools/list` gives it: each `$ref` replaced by its definition, so that it stands alone.

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "description": "`push`: send a store ref to a remote branch by compare-and-swap, never forcing: the remote\nmoves only from the head the last fetch saw to a descendant of it. A push is an export, so\nit needs no identity.",
  "properties": {
    "branch": {
      "description": "The remote branch; by default the remote's followed branch for `main`, and the same\nname for `release/<name>`.",
      "type": [
        "string",
        "null"
      ]
    },
    "remote": {
      "description": "The remote, by its name.",
      "type": "string"
    },
    "source_ref": {
      "default": "main",
      "description": "The store ref to send: `main` (the default) or `release/<name>`.",
      "type": "string"
    }
  },
  "required": [
    "remote"
  ],
  "title": "PushReq",
  "type": "object"
}
```

## Annotations

It moves history between the store and a git remote, and moves no ref of the store: a push moves the remote's branch only from what the last fetch saw, to a descendant of it. Run again, it fetches or sends nothing new. It reaches the remote, beyond the store.

| Annotation | Value | Meaning |
| --- | --- | --- |
| `destructiveHint` | `false` | True: a tool that changes the store may overwrite or delete what is there, not only add to it. |
| `idempotentHint` | `true` | True: calling it again with the same arguments changes nothing more. |
| `openWorldHint` | `true` | True: it reaches beyond a closed set of things. Every tool here stays inside the store. |
| `readOnlyHint` | `false` | True: the tool does not change its environment, the store. |

Its entry in `tools/list` carries no `_meta`.

## CLI command

[`swarmops push`](../commands/push.md) runs the same operation and prints the same envelope.

## Examples

### MCP

No recorded example yet.

## Return information

A tool result: the envelope, whose `op` is `push`, as `structuredContent` and again as the text of its one `content` block. `isError` is true exactly when the envelope's `ok` is false. On success the envelope's `result` is what [`swarmops push`](../commands/push.md#return-information) returns.

## Errors

A failed call is a tool result with `isError: true`; the envelope's `error.code` is one of the [error codes](../errors.md).

- [`E_INVALID_ARG`](../errors.md#e_invalid_arg): arguments that do not fit `PushReq`, a field named twice among them included, or that break one of the server's own rules.
- [`E_NOT_A_REPO`](../errors.md#e_not_a_repo): the server's store is not there; the server serves on.
- [`E_INTERNAL`](../errors.md#e_internal): the operation panicked, a bug.

Then the errors of the operation, as [`swarmops push`](../commands/push.md#errors) lists them.

## See also

- [`swarmops push`](../commands/push.md)
- [MCP tools](README.md)
- [MCP integration](../../develop/mcp.md)
- [Error codes](../errors.md)