The inputSchema `type: "number"` is advisory only — runtime may receive a
string payload that gets interpolated into the osascript template. Coerce
tab_id via Number.parseInt before interpolating at all four sites.
Affected sites:
- findTabById(tabId)
- executeTabOperation(tabId, ...) (close_tab, switch_to_tab, reload_tab,
go_back, go_forward)
- execute_javascript handler
- get_page_content handler
The shared toSafeTabId() helper returns null for missing values (preserving
the active-tab fallthrough) and throws on non-numeric input (surfacing misuse
via the existing request-level try/catch, consistent with the missing-code
path in execute_javascript).
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