[codex] Clarify string tool input errors (#599) #6440

Job	Run time
build-and-check	2m 50s
test-integration-packages/billing	1m 0s
test-integration-packages/internal	1m 5s
test-integration-web	41s
test-integration-packages/agent-runtime	42s
test-integration-common	39s
test-integration-cli	42s
test-integration-sdk	1m 23s
test-.agents	49s
test-cli	55s
test-common	43s
test-web	1m 45s
test-sdk	49s
test-packages/billing	43s
test-packages/agent-runtime	56s
test-packages/internal	53s
	16m 35s

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