microsoft/semantic-kernel · warning · RuntimeError

No chart generated

Error message

No chart generated

What it means

RuntimeError raised in the Bedrock code-interpreter sample after the agent run, when no BinaryContent item was found among the response.items (the binary_item variable stayed None). It is sample plumbing, not a library error: it signals the model never produced a downloadable file (e.g. the chart) for the turn. The agent and thread are already deleted in the finally block before this check.

Source

Thrown at python/samples/concepts/agents/bedrock_agent/bedrock_agent_with_code_interpreter.py:58

    try:
        # Invoke the agent
        async for response in bedrock_agent.invoke(
            messages=ASK,
            thread=thread,
        ):
            print(f"Response:\n{response}")
            thread = response.thread
            if not binary_item:
                binary_item = next((item for item in response.items if isinstance(item, BinaryContent)), None)
    finally:
        # Delete the agent
        await bedrock_agent.delete_agent()
        await thread.delete() if thread else None

    # Save the chart to a file
    if not binary_item:
        raise RuntimeError("No chart generated")

    # Securely assemble the file path and validate it's within the expected directory
    # This is a defense-in-depth measure against directory traversal attacks
    output_dir = Path(__file__).parent.resolve()
    file_path = (output_dir / binary_item.metadata["name"]).resolve()

    # Verify the resolved path is within the expected directory
    if not file_path.is_relative_to(output_dir):
        raise RuntimeError("Invalid filename: would write outside the expected directory")

    binary_item.write_to_file(file_path)
    print(f"Chart saved to {file_path}")

    # Sample output (using anthropic.claude-3-haiku-20240307-v1:0):
    # Response:
    # Here is the bar chart for the given data:
    # [A bar chart showing the following data:
    # Panda   5

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Make the prompt explicitly request a chart/file so the code interpreter runs (the sample expects a bar chart).
2. Verify the Bedrock agent configuration enables the code interpreter action group.
3. Inspect response.items before deletion (move logging before the finally delete) to see whether text or tool messages came back instead of a file.
4. Treat the error as informational: catch RuntimeError and fall back to printing the text response.

Example fix

# before
if not binary_item:
    raise RuntimeError("No chart generated")
# after - graceful fallback, log what came back
if not binary_item:
    print("No chart was produced. Response items:")
    for item in response.items:
        print(repr(item))
    return

from semantic_kernel.contents import BinaryContent

def find_binary(response) -> BinaryContent | None:
    return next((i for i in response.items if isinstance(i, BinaryContent)), None)

binary_item = find_binary(response)
if binary_item is None:
    print("No chart produced; items:", [type(i).__name__ for i in response.items])
    return

from semantic_kernel.contents import BinaryContent
def has_binary_content(response) -> bool:
    return any(isinstance(i, BinaryContent) for i in getattr(response, "items", []))

try:
    # ... run agent, capture binary_item ...
    if not binary_item:
        raise RuntimeError("No chart generated")
except RuntimeError:
    # degrade gracefully: show the textual response instead
    pass

When it happens

Trigger: Running the sample, the Bedrock agent completes its turn but returns no BinaryContent in response.items (the model produced only text, declined to run code, or the code-interpreter session yielded no file). binary_item stays None and the post-run check raises.

Common situations: The model answered in prose without invoking the code interpreter; the prompt did not clearly request a file; the Bedrock agent's action group lacks the code-interpreter tool; or an upstream Bedrock error silently produced an empty items list.

Related errors

• No chart generated
• Invalid operator
• Invalid filename: would write outside the expected directory
• Invalid filename: would write outside the expected directory
• Message role must be either Assistant or User.

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/9d2d220c185785d4. Report an issue: GitHub.