mirror of
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The `/v1/messages` endpoint's AnthropicStreamWrapper silently dropped the trigger chunk of every new content block on a detected block transition (e.g. text -> thinking, thinking -> text, text -> tool_use). The code emitted `content_block_stop` -> `content_block_start` and then returned without re-enqueuing `processed_chunk`, relying on an incorrect assumption that `content_block_start` already carries the trigger chunk's content. In practice, `_translate_streaming_openai_chunk_to_anthropic_content_block()` returns an empty `TextBlock(text="")` for text transitions, so the first characters of every new text/thinking block were lost on the wire. Symptoms for Bedrock Converse reasoning providers (MiniMax, Kimi, Claude extended thinking) using `/v1/messages` + `stream=true`: - Responses start mid-sentence (leading characters missing). - If the model emits the text as a single Bedrock chunk, the text block is streamed with zero `content_block_delta` events, causing clients like Claude Code CLI to see an empty response. - Non-streaming on the same deployment returns the full text correctly. Fix: after emitting the synthetic `content_block_stop` + `content_block_start` pair, re-enqueue `processed_chunk` when it is a non-empty `content_block_delta`. A small `_trigger_delta_has_content` helper inspects the standard Anthropic delta variants (`text`, `thinking`, `partial_json`, `signature`) so that empty tool_use openers (whose tool name is already carried by `content_block_start`) are intentionally skipped. Applied to both the sync (`__next__`) and async (`__anext__`) paths. Tests: - Add `test_first_chunk_on_block_transition.py` with a focused regression test exercising a text -> thinking -> text sequence (the exact Bedrock Converse reasoning-model pattern). The new tests fail on the unpatched `main` and pass after the fix, for both sync and async iterators. - Update the existing `test_parallel_tool_calls.py::test_anthropic_stream_wrapper_interleaved_tool_calls_and_text` expected sequence: two `content_block_delta` events for the interleaved text chunks were previously missing because the wrapper dropped them; the test now also asserts the text content is preserved verbatim. |
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| .. | ||
| a2a_protocol | ||
| anthropic_interface/exceptions | ||
| caching | ||
| completion_extras | ||
| containers | ||
| enterprise | ||
| expected_fine_tuning_api | ||
| expected_responses_api_request | ||
| experimental_mcp_client | ||
| google_genai | ||
| images | ||
| integrations | ||
| interactions | ||
| litellm_core_utils | ||
| llms | ||
| ocr | ||
| passthrough | ||
| proxy | ||
| responses | ||
| router_strategy | ||
| router_utils | ||
| secret_managers | ||
| test_router | ||
| types | ||
| vector_stores | ||
| __init__.py | ||
| conftest.py | ||
| log.txt | ||
| readme.md | ||
| test_a2a_registry_lookup.py | ||
| test_acompletion_session_reuse_e2e.py | ||
| test_add_deployment_no_master_key.py | ||
| test_aembedding_session_reuse_e2e.py | ||
| test_anthropic_beta_headers_filtering.py | ||
| test_anthropic_skills_transformation.py | ||
| test_azure_video_router.py | ||
| test_chat_ui_responses_session.py | ||
| test_claude_haiku_4_5_config.py | ||
| test_claude_opus_4_6_config.py | ||
| test_constants.py | ||
| test_container_router.py | ||
| test_cost_calculation_log_level.py | ||
| test_cost_calculator.py | ||
| test_count_tokens_public_api.py | ||
| test_deepseek_model_metadata.py | ||
| test_eager_tiktoken_load.py | ||
| test_exception_exports.py | ||
| test_exception_header_preservation.py | ||
| test_exception_mapping_request_attribute.py | ||
| test_filter_out_litellm_params.py | ||
| test_get_blog_posts.py | ||
| test_gpt_image_cost_calculator.py | ||
| test_groq_streaming_encoding.py | ||
| test_lazy_imports.py | ||
| test_litellm_params_reserved_keys.py | ||
| test_logging.py | ||
| test_lowest_latency_zero_tokens.py | ||
| test_main.py | ||
| test_model_cost_aliases.py | ||
| test_model_param_helper.py | ||
| test_model_response_normalization.py | ||
| test_nested_drop_params.py | ||
| test_project_alias_tracking.py | ||
| test_project_tags_pydantic.py | ||
| test_redis.py | ||
| test_register_model_custom_pricing.py | ||
| test_responses_api_bridge_non_stream.py | ||
| test_responses_id_security.py | ||
| test_router.py | ||
| test_router_google_genai.py | ||
| test_router_model_cost_isolation.py | ||
| test_router_order_fallback.py | ||
| test_router_per_deployment_num_retries.py | ||
| test_router_redis_init.py | ||
| test_router_retry_non_retryable_errors.py | ||
| test_router_silent_experiment.py | ||
| test_secret_redaction.py | ||
| test_service_logger.py | ||
| test_setup_wizard.py | ||
| test_shared_session_integration.py | ||
| test_ssl_verify_unit.py | ||
| test_stream_chunk_builder_annotations.py | ||
| test_streaming_connection_cleanup.py | ||
| test_system_message_format_bug.py | ||
| test_utils.py | ||
| test_uuid_helper.py | ||
| test_video_generation.py | ||
| test_xai_responses_auto_routing.py | ||
Testing for litellm/
This directory 1:1 maps the the litellm/ directory, and can only contain mocked tests.
The point of this is to:
- Increase test coverage of
litellm/ - Make it easy for contributors to add tests for the
litellm/package and easily run tests without needing LLM API keys.
File name conventions
litellm/proxy/test_caching_routes.pymaps tolitellm/proxy/caching_routes.pytest_<filename>.pymaps tolitellm/<filename>.py