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fix(core): guard null input in ToolValidator.validateInput to prevent NPE #2337

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fix(core): guard null input in ToolValidator.validateInput to prevent NPE #2337

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7 changes: 7 additions & 0 deletions agentscope-core/src/main/java/io/agentscope/core/tool/ToolValidator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,13 @@ public static String validateInput(String input, Map<String, Object> schema) {
return null; // No schema, validation passes
}

// Defensive: treat null/blank input as empty JSON object so that
// networknt-schema does not throw NPE ("argument 'content' is null")
// when a ToolUseBlock carries parsed arguments but no raw content string.
if (input == null || input.isBlank()) {
input = "{}";
}

try {
// Convert schema to JSON string
String schemaJson = JsonUtils.getJsonCodec().toJson(schema);
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