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fix(pydantic-ai): Add error handling to agent execution #92

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ericapisani merged 1 commit into from
Mar 9, 2026
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fix(pydantic-ai): Add error handling to agent execution #92

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19 changes: 11 additions & 8 deletions src/runner/templates/agents/python/pydantic-ai/template.njk
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Original file line number Diff line number Diff line change
Expand Up @@ -53,23 +53,26 @@ def {{ tool.name }}(context: RunContext, {% for param in tool.parameters.require
{% endif %}
{% endfor %}

try:
{% if user_content is string %}
result = await agent.run("{{ user_content }}")
result = await agent.run("{{ user_content }}")
{% else %}
# Multimodal content - build message parts
message_parts = []
# Multimodal content - build message parts
message_parts = []
{% for part in user_content %}
{% if part.type == 'text' %}
message_parts.append("{{ part.text }}")
message_parts.append("{{ part.text }}")
{% elif part.type == 'image' %}
message_parts.append(ImageUrl(url="data:{{ part.mediaType }};base64,{{ part.base64 }}"))
message_parts.append(ImageUrl(url="data:{{ part.mediaType }};base64,{{ part.base64 }}"))
{% endif %}
{% endfor %}
result = await agent.run(message_parts)
result = await agent.run(message_parts)
{% endif %}

# Print response
print(f"Turn {{ loop.index }} Response: {result.output}")
# Print response
print(f"Turn {{ loop.index }} Response: {result.output}")
except Exception as e:
print(f"Turn {{ loop.index }} Error: {type(e).__name__}: {e}")
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@cursor cursor bot Mar 6, 2026

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Swallowed exceptions prevent sentry_sdk.capture_exception from firing

High Severity

The new except Exception as e block catches and prints the error but never re-raises it. When the causeAPIError flag is set, base.python.njk wraps the main() call in its own try-except that calls sentry_sdk.capture_exception(e) — but the exception is now silently swallowed inside main(), so it never propagates. This means Sentry never captures the exception, breaking the error-handling test scenarios that depend on it.

Fix in Cursor Fix in Web

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@ericapisani ericapisani Mar 6, 2026

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I don't think this is entirely accurate as I verified during testing that an error span is being returned from the Python SDK (and not being swallowed as Cursor is saying here) as a result of the generic exception thrown, and is being asserted correctly within the testing framework (example below from a test run):

{
    trace_id: '25a8c19c306a42a2b1bd22b34daa3e84',
    span_id: '85d009fd8743fdb6',
    parent_span_id: '905cfffa695c1f38',
    same_process_as_parent: true,
    op: 'gen_ai.execute_tool',
    description: 'execute_tool read_file',
    start_timestamp: '2026-03-06T16:13:37.239475Z',
    timestamp: '2026-03-06T16:13:37.240453Z',
    origin: 'auto.ai.pydantic_ai',
    status: 'internal_error',
    tags: { status: 'internal_error' },
    data: {
      'thread.id': '8372809984',
      'thread.name': 'MainThread',
      'gen_ai.operation.name': 'execute_tool',
      'gen_ai.tool.type': 'function',
      'gen_ai.tool.name': 'read_file',
      'gen_ai.agent.name': 'file_assistant',
      'gen_ai.tool.input': '{"path": "/nonexistent/file.txt"}'
    }
  }

{% if not loop.last %}
print() # Blank line between turns
{% endif %}
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