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Add error handling for plan&execute agent #3845

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Merged
merged 9 commits into from
Jun 11, 2025
+89 −2
Merged

Add error handling for plan&execute agent #3845

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6f2c088
add more error handling
Hailong-am May 13, 2025
3f00b45
spotlessApply
Hailong-am May 14, 2025
6f5f6ed
Merge branch 'main' into agent_bug_fix
dhrubo-os Jun 3, 2025
a9293d1
Merge branch 'main' into agent_bug_fix
dhrubo-os Jun 5, 2025
d3a5bfb
add unit test
Hailong-am Jun 9, 2025
64b8aaa
Merge branch 'main' into agent_bug_fix
dhrubo-os Jun 9, 2025
7177987
Merge branch 'main' into agent_bug_fix
dhrubo-os Jun 10, 2025
03d4035
spotlessApply
Hailong-am Jun 11, 2025
608810a
add comments for index mapping tool
Hailong-am Jun 11, 2025
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8 changes: 7 additions & 1 deletion ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLChatAgentRunner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -701,7 +701,13 @@ private static void runTool(
);
nextStepListener
.onResponse(
String.format(Locale.ROOT, "Failed to run the tool %s with the error message %s.", finalAction, e.getMessage())
String
.format(
Locale.ROOT,
"Failed to run the tool %s with the error message %s.",
finalAction,
e.getMessage().replaceAll("\\n", "\n")
)
);
});
if (tools.get(action) instanceof MLModelTool) {
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5 changes: 5 additions & 0 deletions ...in/java/org/opensearch/ml/engine/algorithms/agent/MLPlanExecuteAndReflectAgentRunner.java
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Expand Up @@ -520,6 +520,11 @@
if (response.contains("```")) {
response = response.substring(0, response.lastIndexOf("```"));
}
} else {
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  1. This method doesn't have any null check for response
  2. Is there any chance that multiple code block can exist?
  3. what about json array?
  4. what happens if there's any string literals like {"data": "{nested}"}
  5. Possible IndexOutOfBoundsException if markers aren't found
  6. why do we need second trim?
  7. Using substring multiple times creates multiple intermediate string objects
    Each operation like contains(), indexOf(), and lastIndexOf() scans through the string

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This method doesn't have any null check for response

response passed to this method could not be null, otherwise it will throw NPE before call it. But it's a good practice to add null check here

Is there any chance that multiple code block can exist?
what about json array?
what happens if there's any string literals like {"data": "{nested}"}

Yes, all of them are possible. the logic here is try our best to extract the expected json from LLM response.

Possible IndexOutOfBoundsException if markers aren't found

if markers are not found, it will not perform substring

why do we need second trim?

the content extracted from json block may have spaces, so trim is needed here before check it's a valid json string.

Using substring multiple times creates multiple intermediate string objects
Each operation like contains(), indexOf(), and lastIndexOf() scans through the string

that's not a big concern. the response is not large, and gc will help to handle intermediate string objects

// extract content from {} block
if (response.contains("{") && response.contains("}")) {
response = response.substring(response.indexOf("{"), response.lastIndexOf("}") + 1);

Check warning on line 526 in ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLPlanExecuteAndReflectAgentRunner.java

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ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/agent/MLPlanExecuteAndReflectAgentRunner.java#L526 

Added line #L526 was not covered by tests
}
}

response = response.trim();
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6 changes: 5 additions & 1 deletion ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/IndexMappingTool.java
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Expand Up @@ -95,7 +95,11 @@
try {
List<String> indexList = new ArrayList<>();
if (StringUtils.isNotBlank(parameters.get("index"))) {
indexList = gson.fromJson(parameters.get("index"), List.class);
try {
indexList = gson.fromJson(parameters.get("index"), List.class);
} catch (Exception e) {
indexList.add(parameters.get("index"));

Check warning on line 101 in ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/IndexMappingTool.java

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ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/IndexMappingTool.java#L100-L101 

Added lines #L100 - L101 were not covered by tests
}
}

if (indexList.isEmpty()) {
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