press_key

press_key

Press a named key, at an element or wherever focus currently is.

MCP tool	press_key
HTTP	POST /browser/press-key

For Tab, Escape, Enter, arrows and similar. Known keys: add, alt, arrow_down, arrow_left, arrow_right, arrow_up, back_space, backspace, cancel, clear, command, control, decimal, delete, divide, down, end, enter, equals, escape, f1, f10, f11, f12, f2, f3, f4, f5, f6, f7, f8, f9, help, home, insert, left, left_alt, left_command, left_control, left_meta, left_option, left_shift, meta, multiply, null, numpad0, numpad1, numpad2, numpad3, numpad4, numpad5, numpad6, numpad7, numpad8, numpad9, page_down, page_up, pause, return, right, right_alt, right_control, right_meta, right_option, right_shift, semicolon, separator, shift, space, subtract, tab, up, zenkaku_hankaku.

Not a reliable way to scroll - page_down only moves the page when focus happens to be on the scrollable container. Use execute_script to scroll.

To aim the key at an element, pass xpath or css; with neither, it goes wherever focus already is.

Parameters

Name	Type	Required	Default	Notes
key	string	yes	—
session_id	string	yes over HTTP	—	The session_id returned by /browser/open. Required here.
xpath	string	no	—
css	string	no	—
url	string	no	—
wait_timeout	integer	no	30

Returns

Field	Type	Notes
key	string	The key that was sent.
url	string	Current URL after the action.
title	string	Page title after the action.

Errors

Status	Means
400	The request cannot succeed as sent — a missing field, a value that was rejected, or a locator that matched nothing before the wait ran out. Do not retry it unchanged.
401	Missing or wrong bearer token.
404	No such browser session. It ended, the Grid reaped it, or the id was never real. Open a new one and retry.
500	Something failed that this server did not expect.
503	The Grid could not serve this — unreachable, or no free slot for a new browser. Worth retrying after a wait.

Over MCP the same failures arrive as a tool error.

Example

MCP

press_key(key="…")

HTTP

curl -X POST $SELENIUM_FLOW/browser/press-key \
  -H "Authorization: Bearer $TOKEN" \
  -H 'Content-Type: application/json' \
  -d '{
    "session_id": "…",
    "key": "…"
  }'

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