execute_script - kubed-io/selenium-flow GitHub Wiki
Run JavaScript in the page and return what it returns.
| MCP tool | execute_script |
| HTTP | POST /browser/script |
Check the other tools first: interact, write, extract and outline cover most needs, and only interact's hover opens a menu that appears on :hover, which script events never trigger. Use this for what is left: scrolling (window.scrollTo), computed styles, reading many values at once, direct DOM work. Not for drag and drop; drag uses real pointer input.
| Name | Type | Required | Default |
|---|---|---|---|
script |
string | yes | — |
url |
string | no | — |
Every call names its workspace: an X-Workspace header, or
?workspace=<name>. Sending both is refused. See Workspaces.
| Field | Type | Notes |
|---|---|---|
result |
any | Whatever the script returned. Any JSON type. |
url |
string | Current URL after the action. |
title |
string | Page title after the action. |
site_data |
object | Present only when site data was restored, skipped or forgotten in this call. |
page |
object | Present only when this browser was opened with capture=true and the page reported a failure while the call ran: what it caused, and where to read it. |
| 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. |
413 |
The body is over its cap: 1 MiB of JSON, 64 MiB of upload, 1 MiB of flow YAML. Send less; retrying it unchanged will fail again. |
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.
MCP
execute_script(script="…")
HTTP
curl -X POST $SELENIUM_FLOW/browser/script \
-H "Authorization: Bearer $TOKEN" \
-H "X-Workspace: $WORKSPACE" \
-H 'Content-Type: application/json' \
-d '{
"script": "…"
}'