test: port the cc_convert conversion fixture corpus

plugins/abridge/tests/fixtures/anthropic_openai/LICENSE-MIT

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+MIT License
+
+Copyright (c) 2026 cc_convert maintainers
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

plugins/abridge/tests/fixtures/anthropic_openai/README.md

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+# Anthropic ↔ OpenAI conversion fixtures
+
+Golden parity fixtures for bidirectional Anthropic Messages ↔ OpenAI
+Chat Completions translation, exercised by
+`tests/test_anthropic_transform_fixtures.py` against
+`agentix.bridge.clients._anthropic_transforms`.
+
+## Origin and license
+
+These files are copied verbatim from the test corpus of
+[cc_convert](https://github.com/yitianlian/cc_convert) (a Rust
+Anthropic ↔ OpenAI protocol converter), specifically from
+`tests/fixtures/` as vendored on this repo's `abridge/gateway-tito`
+ref (`sidecars/cc_convert/tests/fixtures/`). Only the fixture data was
+copied — no Rust code, no scripts.
+
+cc_convert is dual-licensed **MIT OR Apache-2.0**; we redistribute the
+fixtures under the MIT license. The upstream MIT license text is
+included alongside this file as [`LICENSE-MIT`](LICENSE-MIT)
+(Copyright (c) 2026 cc_convert maintainers).
+
+## Layout
+
+Each subdirectory holds one direction of translation. Files pair up by
+the shared `<NN>_<case_name>` suffix:
+
+- `requests/` — Anthropic → OpenAI request translation.
+  Input `anthropic_<case>.json`, expected output `openai_<case>.json`,
+  plus `tool_map_<case>.json` recording any sanitized-tool-name
+  mapping (empty for all cases except `13_long_tool_name`).
+- `responses/` — OpenAI → Anthropic response translation.
+  Input `openai_<case>.json`, expected output `anthropic_<case>.json`,
+  plus `meta_<case>.json` carrying the `original_model` and the
+  `tool_map` the reference translator was invoked with.
+- `streams/` — OpenAI SSE → Anthropic event-stream translation.
+  Input `openai_<case>.sse` (Chat Completions chunks), expected output
+  `anthropic_<case>.jsonl` (one Anthropic stream event per line, in
+  order).
+
+## Provenance of the goldens
+
+Upstream generated the request goldens with LiteLLM's
+`AnthropicAdapter` as the primary parity oracle (cross-referenced
+against 1rgs/claude-code-proxy and maxnowack/anthropic-proxy); the
+response and stream goldens are hand-curated from the OpenAI Chat
+Completions API reference. Some goldens therefore carry LiteLLM
+serialization artifacts (explicit `"thinking_blocks": null`,
+`"provider_specific_fields": null`, an unconditional empty leading
+text block in streams) — the test suite's comparison helpers document
+how those are normalized.

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_01_plain_user_text.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hello",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_02_system_string.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "system": "Be concise."
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_03_system_blocks_with_cache_control.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "system": [
+    {
+      "cache_control": {
+        "type": "ephemeral"
+      },
+      "text": "rule 1",
+      "type": "text"
+    }
+  ]
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_04_multi_turn.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    },
+    {
+      "content": "hello!",
+      "role": "assistant"
+    },
+    {
+      "content": "ok",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_05_user_image_base64.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "source": {
+            "data": "AAAA",
+            "media_type": "image/png",
+            "type": "base64"
+          },
+          "type": "image"
+        },
+        {
+          "text": "what is this?",
+          "type": "text"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_06_user_image_url.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "source": {
+            "type": "url",
+            "url": "https://example.com/x.png"
+          },
+          "type": "image"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_07_assistant_single_tool_use.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "id": "toolu_1",
+          "input": {
+            "city": "Paris"
+          },
+          "name": "get_weather",
+          "type": "tool_use"
+        }
+      ],
+      "role": "assistant"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_08_assistant_two_parallel_tool_uses.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "id": "tu_a",
+          "input": {
+            "a": 1
+          },
+          "name": "f1",
+          "type": "tool_use"
+        },
+        {
+          "id": "tu_b",
+          "input": {
+            "b": 2
+          },
+          "name": "f2",
+          "type": "tool_use"
+        }
+      ],
+      "role": "assistant"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_09_user_single_tool_result.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "content": "21C",
+          "tool_use_id": "toolu_1",
+          "type": "tool_result"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_10_user_three_tool_results.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "content": "a",
+          "tool_use_id": "t1",
+          "type": "tool_result"
+        },
+        {
+          "content": "b",
+          "tool_use_id": "t2",
+          "type": "tool_result"
+        },
+        {
+          "content": "c",
+          "tool_use_id": "t3",
+          "type": "tool_result"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_11_user_tool_result_multipart.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": [
+        {
+          "content": [
+            {
+              "text": "see image:",
+              "type": "text"
+            },
+            {
+              "source": {
+                "type": "url",
+                "url": "https://x/y.png"
+              },
+              "type": "image"
+            }
+          ],
+          "tool_use_id": "t1",
+          "type": "tool_result"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini"
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_12_tools_input_schema.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "tools": [
+    {
+      "description": "weather lookup",
+      "input_schema": {
+        "properties": {
+          "city": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "city"
+        ],
+        "type": "object"
+      },
+      "name": "get_weather"
+    }
+  ]
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_13_long_tool_name.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "tools": [
+    {
+      "input_schema": {
+        "type": "object"
+      },
+      "name": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+    }
+  ]
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_14_tool_choice_any.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "tool_choice": {
+    "type": "any"
+  }
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_15_tool_choice_named.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "tool_choice": {
+    "name": "f",
+    "type": "tool"
+  },
+  "tools": [
+    {
+      "input_schema": {
+        "type": "object"
+      },
+      "name": "f"
+    }
+  ]
+}

plugins/abridge/tests/fixtures/anthropic_openai/requests/anthropic_16_metadata_user_id.json

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+{
+  "max_tokens": 100,
+  "messages": [
+    {
+      "content": "hi",
+      "role": "user"
+    }
+  ],
+  "metadata": {
+    "user_id": "u-123"
+  },
+  "model": "gpt-4o-mini"
+}