# capture_since

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

> Read what a pane wrote since the previous call. The first call, with no cursor, starts watching and returns a cursor; later calls pass it back and receive only what is new, as the raw output stream, not the rendered screen: a line redrawn in place repeats; capture_pane shows the screen. Use this to follow a pane over several turns without re-reading the whole screen. The answer says missed=true if the cursor no longer names retained output, including when the pane outran the buffer, its live tail was evicted, or the server restarted. Starting a tail owns a retained observer until the tail is evicted or the server stops. Read pane output; accepts no client-supplied executable input. Returned content may be sensitive or untrusted.

MCP is in development

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

Read what a pane wrote since the previous call. The first call, with no cursor, starts watching and returns a cursor; later calls pass it back and receive only what is new, as the raw output stream, not the rendered screen: a line redrawn in place repeats; [capture\_pane](https://libtmux.org/en/rs/latest/mcp/tools/capture_pane/) shows the screen. Use this to follow a pane over several turns without re-reading the whole screen. The answer says missed=true if the cursor no longer names retained output, including when the pane outran the buffer, its live tail was evicted, or the server restarted. Starting a tail owns a retained observer until the tail is evicted or the server stops. Read pane output; accepts no client-supplied executable input. Returned content may be sensitive or untrusted.

[All Rust tools](../) · [JSON](../capture_since.json) · [Source](https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/tmux-mcp/src/tools/observe.rs#L434)

## Arguments

* `cursor` optional · string | null

  The cursor from the previous call. Omit to start watching.

* `pane` required · string

  The \`%\`-prefixed pane to read.

## Schemas

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