[codex] Clarify string tool input errors #508

Job	Run time
build-freebuff	1m 16s
build-and-smoke-freebuff-windows	2m 42s
e2e-help-command	1m 24s
e2e-agent-startup	2m 24s
e2e-startup	1m 6s
e2e-terminal-command	58s
e2e-ads-behavior	1m 11s
e2e-slash-commands	1m 12s
e2e-code-edit	1m 8s
e2e-version	57s
	14m 18s

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