# set_history_limit

Source: https://libtmux.org/en/rs/latest/mcp/tools/set_history_limit/

> Set the scrollback history limit for a session or its global default. From tmux 3.7 existing panes take it too, and lowering it discards their scrollback past the new limit. Delete tmux state; accepts no command payload.

MCP is in development

Server behavior and tool contracts may change. Tool availability depends on the server configuration.

Set the scrollback history limit for a session or its global default. From tmux 3.7 existing panes take it too, and lowering it discards their scrollback past the new limit. Delete tmux state; accepts no command payload.

[All Rust tools](https://libtmux.org/en/rs/latest/mcp/tools/) · [JSON](https://libtmux.org/en/rs/latest/mcp/tools/set_history_limit.json) · [Source](https://github.com/libtmux/libtmux-rs/blob/2cef1aa642182dd1970c3688feb6a568ff666e64/crates/tmux-mcp/src/tools/contract.rs#L895)

## Arguments

* `limit` required · integer

  Lines of scrollback to keep per pane.

* `session` optional · string | null

  The session to change, by \`$\`-prefixed id or name. Omit to change the global default.

## Schemas

The schema defines required fields, nested values, defaults, and validation constraints.

Input schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "properties": {
    "limit": {
      "description": "Lines of scrollback to keep per pane.",
      "minimum": 0,
      "type": "integer"
    },
    "session": {
      "description": "The session to change, by `$`-prefixed id or name. Omit to change the\nglobal default.",
      "type": [
        "string",
        "null"
      ]
    }
  },
  "required": [
    "limit"
  ],
  "type": "object"
}
```

Output schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "name": {
      "type": "string"
    },
    "target": {
      "type": [
        "string",
        "null"
      ]
    },
    "value": {
      "type": "string"
    }
  },
  "required": [
    "name",
    "value"
  ],
  "type": "object"
}
```

Tool annotations

```json
{
  "destructiveHint": true,
  "idempotentHint": true,
  "openWorldHint": false,
  "readOnlyHint": false,
  "title": "Set History Limit"
}
```