Python: [BREAKING] Redesign Python exception hierarchy (#4082)
* [BREAKING] Redesign Python exception hierarchy
Replace the flat ServiceException family with domain-scoped branches:
- AgentException (with InvalidAuth, InvalidRequest, InvalidResponse, ContentFilter)
- ChatClientException (same consistent suberrors)
- IntegrationException (same + InitializationError)
- WorkflowException (Runner, Convergence, Checkpoint, Validation, Action, Declarative)
- ContentError (AdditionItemMismatch)
- ToolException / ToolExecutionException (unchanged)
- MiddlewareException / MiddlewareTermination (unchanged)
Key changes:
- All Service* exceptions removed (ServiceException, ServiceInitializationError, etc.)
- AgentExecutionException split into AgentInvalidRequest/ResponseException
- AgentInvocationError removed, split into AgentInvalidRequest/ResponseException
- Workflow exceptions moved from _workflows/_exceptions.py into main exceptions.py
- _workflows/__init__.py emptied; main __init__.py imports directly from submodules
- Purview exceptions re-parented under IntegrationException hierarchy
- Init validation errors use built-in ValueError/TypeError instead of custom exceptions
- CODING_STANDARD.md updated with hierarchy design and rationale
Fixes microsoft/agent-framework#3410
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* Clarify ToolException vs ToolExecutionException docstrings
ToolException: base class for all tool-related exceptions (preconditions,
connection/init failures).
ToolExecutionException: runtime call failures (tool call failed, reconnect
failed, MCP errors).
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* Fix remaining stale imports from agent_framework._workflows
- azurefunctions: _context.py, _app.py, _serialization.py, test_func_utils.py
used 'from agent_framework._workflows import X' which broke after
emptying _workflows/__init__.py; changed to direct submodule imports
- azure-ai-search: test still referenced ServiceInitializationError;
updated to ValueError to match production code
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---------
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Peter Ibekwe ·
Evan Mattson ·
Eduard van Valkenburg ·