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odysseus/tests/test_agent_loop_tool_output_truncation.py
T

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Python

"""Tool-output display truncation uses _truncate with an indicator.
Previously agent_loop sliced tool output to a hard character limit ([:2000]
or [:4000]) with no signal to the UI that data was lost. Now it delegates to
tool_utils._truncate which caps at MAX_OUTPUT_CHARS (10 000) and appends
a ``... (truncated, N chars total)`` suffix so the frontend can show a
truncation indicator in the tool bubble.
"""
from src.tool_utils import _truncate, MAX_OUTPUT_CHARS
from src.tool_execution import format_tool_result
def test_short_output_unchanged():
"""Outputs within the limit pass through verbatim."""
text = "hello world"
assert _truncate(text) == text
def test_long_output_truncated_with_indicator():
"""Outputs exceeding MAX_OUTPUT_CHARS are truncated with a suffix."""
text = "x" * (MAX_OUTPUT_CHARS + 500)
result = _truncate(text)
assert len(result) > MAX_OUTPUT_CHARS # includes suffix
assert result.startswith("x" * MAX_OUTPUT_CHARS)
assert "truncated" in result
assert str(len(text)) in result # original length reported
def test_exact_limit_unchanged():
"""An output exactly at the limit is not truncated."""
text = "a" * MAX_OUTPUT_CHARS
assert _truncate(text) == text
def test_default_limit_matches_constant():
"""_truncate default limit equals MAX_OUTPUT_CHARS (10 000)."""
assert MAX_OUTPUT_CHARS == 10_000
text = "y" * 10_001
result = _truncate(text)
assert "truncated" in result
def test_empty_string():
assert _truncate("") == ""
def test_external_bridge_result_is_bounded_before_model_replay():
text = "package output\n" * MAX_OUTPUT_CHARS
rendered = format_tool_result(
"bash: install dependencies",
{"output": text, "exit_code": 0},
)
assert len(rendered) < MAX_OUTPUT_CHARS + 100
assert "truncated" in rendered
def test_format_tool_result_does_not_serialize_image_payloads_as_json():
rendered = format_tool_result(
"read media",
{
"output": "frames extracted",
"exit_code": 0,
"images": [{"mimeType": "image/png", "data": "base64-frame-data"}],
},
)
assert "frames extracted" in rendered
assert "base64-frame-data" not in rendered