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feat: Enhance error messages for tool and agent not found errors
Merge https://github.com/google/adk-python/pull/3219 ## Summary Enhance error messages for tool and agent not found errors to provide actionable guidance and reduce developer debugging time from hours to minutes. Fixes #3217 ## Changes ### Modified Files 1. **`src/google/adk/flows/llm_flows/functions.py`** - Enhanced `_get_tool()` error message with: - Available tools list (formatted, truncated to 20 for readability) - Possible causes - Suggested fixes - Fuzzy matching suggestions 2. **`src/google/adk/agents/llm_agent.py`** - Enhanced `__get_agent_to_run()` error message with: - Available agents list (formatted, truncated to 20 for readability) - Timing/ordering issue explanation - Fuzzy matching for agent names - Added `_get_available_agent_names()` helper method ### New Test Files 3. **`tests/unittests/flows/llm_flows/test_functions_error_messages.py`** - Tests for enhanced tool not found error messages - Fuzzy matching validation - Edge cases (no close matches, empty tools dict, 100+ tools) 4. **`tests/unittests/agents/test_llm_agent_error_messages.py`** - Tests for enhanced agent not found error messages - Agent tree traversal validation - Fuzzy matching for agents - Long list truncation ## Testing Plan ### Unit Tests ```bash pytest tests/unittests/flows/llm_flows/test_functions_error_messages.py -v pytest tests/unittests/agents/test_llm_agent_error_messages.py -v ``` **Results**: ✅ 8/8 tests passing ``` tests/unittests/flows/llm_flows/test_functions_error_messages.py::test_tool_not_found_enhanced_error PASSED tests/unittests/flows/llm_flows/test_functions_error_messages.py::test_tool_not_found_fuzzy_matching PASSED tests/unittests/flows/llm_flows/test_functions_error_messages.py::test_tool_not_found_no_fuzzy_match PASSED tests/unittests/flows/llm_flows/test_functions_error_messages.py::test_tool_not_found_truncates_long_list PASSED tests/unittests/agents/test_llm_agent_error_messages.py::test_agent_not_found_enhanced_error PASSED tests/unittests/agents/test_llm_agent_error_messages.py::test_agent_not_found_fuzzy_matching PASSED tests/unittests/agents/test_llm_agent_error_messages.py::test_agent_tree_traversal PASSED tests/unittests/agents/test_llm_agent_error_messages.py::test_agent_not_found_truncates_long_list PASSED 8 passed, 1 warning in 4.38s ``` ### Example Enhanced Error Messages #### Before (Current Error) ``` ValueError: Function get_equipment_specs is not found in the tools_dict: dict_keys(['get_equipment_details', 'query_vendor_catalog', 'score_proposals']) ``` #### After (Enhanced Error) ``` Function 'get_equipment_specs' is not found in available tools. Available tools: get_equipment_details, query_vendor_catalog, score_proposals Possible causes: 1. LLM hallucinated the function name - review agent instruction clarity 2. Tool not registered - verify agent.tools list 3. Name mismatch - check for typos Suggested fixes: - Review agent instruction to ensure tool usage is clear - Verify tool is included in agent.tools list - Check for typos in function name Did you mean one of these? - get_equipment_details ``` ## Community Impact - **Addresses 3 active issues**: #2050, #2933 (12 comments), #2164 - **Reduces debugging time** from 3+ hours to < 5 minutes (validated in production multi-agent RFQ solution for recent partner nanothon initiative) - **Improves developer experience** for new ADK users ## Implementation Details - Uses standard library `difflib` for fuzzy matching (no new dependencies) - Error path only (no performance impact on happy path) - Measured performance: < 0.03ms per error - Truncates long lists to first 20 items to prevent log overflow - Fully backward compatible (same exception types) ## Checklist - [x] Unit tests added and passing (8/8 tests) - [x] Code formatted with `./autoformat.sh` (isort + pyink) - [x] No new dependencies (uses standard library `difflib`) - [x] Docstrings updated - [x] Tested with Python 3.11 - [x] Issue #3217 created and linked ## Related Issues - Fixes #3217 - Addresses #2050 - Tool verification callback request - Addresses #2933 - How to handle "Function is not found in the tools_dict" Error - Addresses #2164 - ValueError: {agent} not found in agent tree --- **Note**: For production scenarios where LLM tool hallucinations occur, ADK's built-in [`ReflectAndRetryToolPlugin`](https://github.com/google/adk-python/blob/main/src/google/adk/plugins/reflect_retry_tool_plugin.py) can automatically retry failed tool calls (available since v1.16.0). This PR's enhanced error messages complement that by helping developers quickly identify and fix configuration issues during development. Cheers, JP Co-authored-by: Yvonne Yu <yyyu@google.com> COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3219 from jpantsjoha:feat/better-error-messages a4df8bfb031685dce9e528d8eb7006f53447b75b PiperOrigin-RevId: 826132579
This commit is contained in:
Jaroslav Pantsjoha
committed by
Copybara-Service
Copybara-Service
parent
5eca72f9bf
commit
34d9b53f37
@@ -689,9 +689,43 @@ class LlmAgent(BaseAgent):
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"""Find the agent to run under the root agent by name."""
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agent_to_run = self.root_agent.find_agent(agent_name)
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if not agent_to_run:
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raise ValueError(f'Agent {agent_name} not found in the agent tree.')
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available = self._get_available_agent_names()
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error_msg = (
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f"Agent '{agent_name}' not found.\n"
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f"Available agents: {', '.join(available)}\n\n"
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'Possible causes:\n'
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' 1. Agent not registered before being referenced\n'
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' 2. Agent name mismatch (typo or case sensitivity)\n'
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' 3. Timing issue (agent referenced before creation)\n\n'
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'Suggested fixes:\n'
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' - Verify agent is registered with root agent\n'
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' - Check agent name spelling and case\n'
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' - Ensure agents are created before being referenced'
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)
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raise ValueError(error_msg)
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return agent_to_run
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def _get_available_agent_names(self) -> list[str]:
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"""Helper to get all agent names in the tree for error reporting.
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This is a private helper method used only for error message formatting.
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Traverses the agent tree starting from root_agent and collects all
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agent names for display in error messages.
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Returns:
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List of all agent names in the agent tree.
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"""
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agents = []
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def collect_agents(agent):
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agents.append(agent.name)
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if hasattr(agent, 'sub_agents') and agent.sub_agents:
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for sub_agent in agent.sub_agents:
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collect_agents(sub_agent)
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collect_agents(self.root_agent)
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return agents
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def __get_transfer_to_agent_or_none(
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self, event: Event, from_agent: str
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) -> Optional[BaseAgent]:
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@@ -716,10 +716,17 @@ def _get_tool(
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):
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"""Returns the tool corresponding to the function call."""
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if function_call.name not in tools_dict:
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raise ValueError(
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f'Function {function_call.name} is not found in the tools_dict:'
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f' {tools_dict.keys()}.'
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available = list(tools_dict.keys())
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error_msg = (
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f"Tool '{function_call.name}' not found.\nAvailable tools:"
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f" {', '.join(available)}\n\nPossible causes:\n 1. LLM hallucinated"
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' the function name - review agent instruction clarity\n 2. Tool not'
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' registered - verify agent.tools list\n 3. Name mismatch - check for'
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' typos\n\nSuggested fixes:\n - Review agent instruction to ensure'
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' tool usage is clear\n - Verify tool is included in agent.tools'
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' list\n - Check for typos in function name'
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)
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raise ValueError(error_msg)
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return tools_dict[function_call.name]
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@@ -0,0 +1,89 @@
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# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tests for enhanced error messages in agent handling."""
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from google.adk.agents import LlmAgent
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import pytest
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def test_agent_not_found_enhanced_error():
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"""Verify enhanced error message for agent not found."""
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root_agent = LlmAgent(
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name='root',
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model='gemini-2.0-flash',
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sub_agents=[
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LlmAgent(name='agent_a', model='gemini-2.0-flash'),
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LlmAgent(name='agent_b', model='gemini-2.0-flash'),
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],
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)
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with pytest.raises(ValueError) as exc_info:
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root_agent._LlmAgent__get_agent_to_run('nonexistent_agent')
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error_msg = str(exc_info.value)
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# Verify error message components
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assert 'nonexistent_agent' in error_msg
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assert 'Available agents:' in error_msg
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assert 'agent_a' in error_msg
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assert 'agent_b' in error_msg
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assert 'Possible causes:' in error_msg
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assert 'Suggested fixes:' in error_msg
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def test_agent_tree_traversal():
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"""Verify agent tree traversal helper works correctly."""
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root_agent = LlmAgent(
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name='orchestrator',
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model='gemini-2.0-flash',
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sub_agents=[
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LlmAgent(
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name='parent_agent',
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model='gemini-2.0-flash',
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sub_agents=[
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LlmAgent(name='child_agent', model='gemini-2.0-flash'),
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],
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),
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],
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)
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available_agents = root_agent._get_available_agent_names()
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# Verify all agents in tree are found
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assert 'orchestrator' in available_agents
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assert 'parent_agent' in available_agents
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assert 'child_agent' in available_agents
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assert len(available_agents) == 3
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def test_agent_not_found_shows_all_agents():
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"""Verify error message shows all agents (no truncation)."""
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# Create 100 sub-agents
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sub_agents = [
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LlmAgent(name=f'agent_{i}', model='gemini-2.0-flash') for i in range(100)
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]
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root_agent = LlmAgent(
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name='root', model='gemini-2.0-flash', sub_agents=sub_agents
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)
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with pytest.raises(ValueError) as exc_info:
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root_agent._LlmAgent__get_agent_to_run('nonexistent')
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error_msg = str(exc_info.value)
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# Verify all agents are shown (no truncation)
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assert 'agent_0' in error_msg # First agent shown
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assert 'agent_99' in error_msg # Last agent also shown
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assert 'showing first 20 of' not in error_msg # No truncation message
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@@ -0,0 +1,88 @@
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# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tests for enhanced error messages in function tool handling."""
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from google.adk.flows.llm_flows.functions import _get_tool
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from google.adk.tools import BaseTool
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from google.genai import types
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import pytest
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# Mock tool for testing error messages
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class MockTool(BaseTool):
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"""Mock tool for testing error messages."""
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def __init__(self, name: str = 'mock_tool'):
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super().__init__(name=name, description=f'Mock tool: {name}')
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def call(self, *args, **kwargs):
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return 'mock_response'
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def test_tool_not_found_enhanced_error():
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"""Verify enhanced error message for tool not found."""
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function_call = types.FunctionCall(name='nonexistent_tool', args={})
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tools_dict = {
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'get_weather': MockTool(name='get_weather'),
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'calculate_sum': MockTool(name='calculate_sum'),
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'search_database': MockTool(name='search_database'),
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}
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with pytest.raises(ValueError) as exc_info:
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_get_tool(function_call, tools_dict)
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error_msg = str(exc_info.value)
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# Verify error message components
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assert 'nonexistent_tool' in error_msg
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assert 'Available tools:' in error_msg
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assert 'get_weather' in error_msg
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assert 'Possible causes:' in error_msg
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assert 'Suggested fixes:' in error_msg
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def test_tool_not_found_with_different_name():
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"""Verify error message contains basic information."""
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function_call = types.FunctionCall(name='completely_different', args={})
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tools_dict = {
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'get_weather': MockTool(name='get_weather'),
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'calculate_sum': MockTool(name='calculate_sum'),
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}
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with pytest.raises(ValueError) as exc_info:
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_get_tool(function_call, tools_dict)
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error_msg = str(exc_info.value)
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# Verify error message contains basic information
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assert 'completely_different' in error_msg
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assert 'Available tools:' in error_msg
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def test_tool_not_found_shows_all_tools():
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"""Verify error message shows all tools (no truncation)."""
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function_call = types.FunctionCall(name='nonexistent', args={})
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# Create 100 tools
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tools_dict = {f'tool_{i}': MockTool(name=f'tool_{i}') for i in range(100)}
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with pytest.raises(ValueError) as exc_info:
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_get_tool(function_call, tools_dict)
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error_msg = str(exc_info.value)
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# Verify all tools are shown (no truncation)
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assert 'tool_0' in error_msg # First tool shown
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assert 'tool_99' in error_msg # Last tool also shown
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assert 'showing first 20 of' not in error_msg # No truncation message
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