feat(llm): halkyon_llm, language models' APIs streamed over plain HTTP (ADR 0021, step 2)

A pure Dart package, no SDKs, one interface (LlmClient) over Anthropic's
Messages API, OpenAI's chat completions, in each known host's dialect and
the local servers' (D45), and OpenAI's Responses API, stateless (D46). A
model's turn keeps what its provider wants back with the tools' results:
Anthropic's thinking blocks, the Responses API's reasoning items and
message phase, Gemini's thought signatures. Failures come by kind, the
provider's words cut and without keys.

Tested on replies written from the providers' documentation, replayed in
pieces of 1, 7 and 4,096 bytes; tool/record_llm.dart records real ones
with a key of one's own, which the tests then run on too (D36).
FakeLlmClient for the code that uses it. BSD-3-Clause, as halkyon_oidc.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

packages/halkyon_llm/test/fixtures/documented/anthropic/overloaded_midstream.http

@@ -0,0 +1,15 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: message_start
+data: {"type":"message_start","message":{"id":"msg_01Qm2vYB8xkN4cH6sGtRpL3J","type":"message","role":"assistant","model":"claude-sonnet-5-5","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":412,"output_tokens":1}}}
+
+event: content_block_start
+data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"„Hund“"}}
+
+event: error
+data: {"type": "error", "error": {"type": "overloaded_error", "message": "Overloaded"}}
+

packages/halkyon_llm/test/fixtures/documented/anthropic/status_400.http

@@ -0,0 +1,4 @@
+HTTP 400
+content-type: application/json
+
+{"type":"error","error":{"type":"invalid_request_error","message":"model: claude-sonet-5-5 is not a valid model"},"request_id":"req_011CSHoEeqs5C35K2UUqR7G0"}

packages/halkyon_llm/test/fixtures/documented/anthropic/status_401.http

@@ -0,0 +1,5 @@
+HTTP 401
+content-type: application/json
+request-id: req_018EeWyXxfu5pfWkrYcMdjWG
+
+{"type":"error","error":{"type":"authentication_error","message":"invalid x-api-key"},"request_id":"req_018EeWyXxfu5pfWkrYcMdjWG"}

packages/halkyon_llm/test/fixtures/documented/anthropic/status_402.http

@@ -0,0 +1,4 @@
+HTTP 402
+content-type: application/json
+
+{"type":"error","error":{"type":"billing_error","message":"Your credit balance is too low to access the Claude API."},"request_id":"req_011CSHoEeqs5C35K2UUqR7G1"}

packages/halkyon_llm/test/fixtures/documented/anthropic/status_429.http

@@ -0,0 +1,5 @@
+HTTP 429
+content-type: application/json
+retry-after: 30
+
+{"type":"error","error":{"type":"rate_limit_error","message":"This request would exceed the rate limit for your organization of 50 requests per minute."},"request_id":"req_011CSHoEeqs5C35K2UUqR7Fy"}

packages/halkyon_llm/test/fixtures/documented/anthropic/status_529.http

@@ -0,0 +1,4 @@
+HTTP 529
+content-type: application/json
+
+{"type":"error","error":{"type":"overloaded_error","message":"Overloaded"},"request_id":"req_011CSHoEeqs5C35K2UUqR7Fz"}

packages/halkyon_llm/test/fixtures/documented/anthropic/text.http

@@ -0,0 +1,39 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: message_start
+data: {"type":"message_start","message":{"id":"msg_01Xq7aVbN3T9kd2LwPZr5HcE","type":"message","role":"assistant","model":"claude-sonnet-5-5","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":412,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":1}}}
+
+event: content_block_start
+data: {"type":"content_block_start","index":0,"content_block":{"type":"thinking","thinking":"","signature":""}}
+
+event: ping
+data: {"type": "ping"}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":0,"delta":{"type":"thinking_delta","thinking":""}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":0,"delta":{"type":"signature_delta","signature":"EqQBCgIYAhIMxk3Lr9vQm2HbW7pTGgy1d2nXo8Rf4KsJ0eQiMNp6"}}
+
+event: content_block_stop
+data: {"type":"content_block_stop","index":0}
+
+event: content_block_start
+data: {"type":"content_block_start","index":1,"content_block":{"type":"text","text":""}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"text_delta","text":"„Hund“ heißt auf Japanisch"}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"text_delta","text":" 犬 (いぬ, inu)."}}
+
+event: content_block_stop
+data: {"type":"content_block_stop","index":1}
+
+event: message_delta
+data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"output_tokens":38}}
+
+event: message_stop
+data: {"type":"message_stop"}
+

packages/halkyon_llm/test/fixtures/documented/anthropic/tool.http

@@ -0,0 +1,45 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: message_start
+data: {"type":"message_start","message":{"id":"msg_014p7gG3wDgGV9EUtLvnow3U","type":"message","role":"assistant","model":"claude-sonnet-5-5","stop_sequence":null,"usage":{"input_tokens":472,"output_tokens":2},"content":[],"stop_reason":null}}
+
+event: content_block_start
+data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}
+
+event: ping
+data: {"type": "ping"}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Ich sehe"}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" im Studienset nach."}}
+
+event: content_block_stop
+data: {"type":"content_block_stop","index":0}
+
+event: content_block_start
+data: {"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"toolu_01T1x1fJ34qAmk2tNTrN7Up6","name":"find_cards","input":{}}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":""}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"query\":"}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" \"Hu"}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"nd\", \"limit\": 5}"}}
+
+event: content_block_stop
+data: {"type":"content_block_stop","index":1}
+
+event: message_delta
+data: {"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"output_tokens":89}}
+
+event: message_stop
+data: {"type":"message_stop"}
+

packages/halkyon_llm/test/fixtures/documented/openai-responses/incomplete.http

@@ -0,0 +1,24 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_2d8f33e0a1b2c3d4","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":1,"output_index":0,"item":{"id":"rs_2d8f33e0aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1","summary":[]}}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":2,"output_index":0,"item":{"id":"rs_2d8f33e0aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1nQ2xv8WcTq0Lz3HfJ5yV7aBdE9gKmPuRtY1sXo4iC6eNlA2vB8jM0zQwU=","summary":[]}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":3,"output_index":1,"item":{"id":"msg_2d8f33e0bb02","type":"message","status":"in_progress","role":"assistant","content":[],"phase":"final_answer"}}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":4,"item_id":"msg_2d8f33e0bb02","output_index":1,"content_index":0,"delta":"„Hund“ heißt","logprobs":[],"obfuscation":"Zr"}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":5,"output_index":1,"item":{"id":"msg_2d8f33e0bb02","type":"message","status":"incomplete","role":"assistant","content":[{"type":"output_text","text":"„Hund“ heißt","annotations":[],"logprobs":[]}],"phase":"final_answer"}}
+
+event: response.incomplete
+data: {"type":"response.incomplete","sequence_number":6,"response":{"id":"resp_2d8f33e0a1b2c3d4","object":"response","created_at":1761400200,"status":"incomplete","background":false,"error":null,"incomplete_details":{"reason":"max_output_tokens"},"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[{"id":"rs_2d8f33e0aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1nQ2xv8WcTq0Lz3HfJ5yV7aBdE9gKmPuRtY1sXo4iC6eNlA2vB8jM0zQwU=","summary":[]},{"id":"msg_2d8f33e0bb02","type":"message","status":"incomplete","role":"assistant","content":[{"type":"output_text","text":"„Hund“ heißt","annotations":[],"logprobs":[]}],"phase":"final_answer"}],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":{"input_tokens":412,"input_tokens_details":{"cached_tokens":0},"output_tokens":16,"output_tokens_details":{"reasoning_tokens":12},"total_tokens":428},"metadata":{}}}
+

packages/halkyon_llm/test/fixtures/documented/openai-responses/quota_error.http

@@ -0,0 +1,15 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_3e9044f1b2c3d4e5","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.in_progress
+data: {"type":"response.in_progress","sequence_number":1,"response":{"id":"resp_3e9044f1b2c3d4e5","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: error
+data: {"type":"error","sequence_number":2,"error":{"type":"insufficient_quota","code":"insufficient_quota","message":"You exceeded your current quota, please check your plan and billing details.","param":null}}
+
+event: response.failed
+data: {"type":"response.failed","sequence_number":3,"response":{"id":"resp_3e9044f1b2c3d4e5","object":"response","created_at":1761400200,"status":"failed","background":false,"error":{"code":"insufficient_quota","message":"You exceeded your current quota, please check your plan and billing details."},"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+

packages/halkyon_llm/test/fixtures/documented/openai-responses/server_error_midstream.http

@@ -0,0 +1,18 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_4fa155a2c3d4e5f6","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":1,"output_index":0,"item":{"id":"msg_4fa155a2bb01","type":"message","status":"in_progress","role":"assistant","content":[],"phase":"final_answer"}}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":2,"item_id":"msg_4fa155a2bb01","output_index":0,"content_index":0,"delta":"„Hund“","logprobs":[],"obfuscation":"Qx"}
+
+event: error
+data: {"type":"error","sequence_number":3,"code":"server_error","message":"The server had an error while processing your request.","param":null}
+
+event: response.failed
+data: {"type":"response.failed","sequence_number":4,"response":{"id":"resp_4fa155a2c3d4e5f6","object":"response","created_at":1761400200,"status":"failed","background":false,"error":{"code":"server_error","message":"The server had an error while processing your request."},"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":{"input_tokens":412,"input_tokens_details":{"cached_tokens":0},"output_tokens":3,"output_tokens_details":{"reasoning_tokens":0},"total_tokens":415},"metadata":{}}}
+

packages/halkyon_llm/test/fixtures/documented/openai-responses/status_401.http

@@ -0,0 +1,4 @@
+HTTP 401
+content-type: application/json
+
+{"error":{"message":"Incorrect API key provided: sk-proj-****wxyz. You can find your API key at https://platform.openai.com/account/api-keys.","type":"invalid_request_error","param":null,"code":"invalid_api_key"}}

packages/halkyon_llm/test/fixtures/documented/openai-responses/status_429.http

@@ -0,0 +1,5 @@
+HTTP 429
+content-type: application/json
+retry-after: 20
+
+{"error":{"message":"Rate limit reached for gpt-5-mini in organization org-x on requests per min (RPM): Limit 500, Used 500, Requested 1.","type":"requests","param":null,"code":"rate_limit_exceeded"}}

packages/halkyon_llm/test/fixtures/documented/openai-responses/status_429_quota.http

@@ -0,0 +1,4 @@
+HTTP 429
+content-type: application/json
+
+{"error":{"message":"You exceeded your current quota, please check your plan and billing details.","type":"insufficient_quota","param":null,"code":"insufficient_quota"}}

packages/halkyon_llm/test/fixtures/documented/openai-responses/text.http

@@ -0,0 +1,44 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_0f3a91c2d4e5b6a7","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.in_progress
+data: {"type":"response.in_progress","sequence_number":1,"response":{"id":"resp_0f3a91c2d4e5b6a7","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":2,"output_index":0,"item":{"id":"rs_0f3a91c2aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1","summary":[]}}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":3,"output_index":0,"item":{"id":"rs_0f3a91c2aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1nQ2xv8WcTq0Lz3HfJ5yV7aBdE9gKmPuRtY1sXo4iC6eNlA2vB8jM0zQwU=","summary":[]}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":4,"output_index":1,"item":{"id":"msg_0f3a91c2bb02","type":"message","status":"in_progress","role":"assistant","content":[],"phase":"final_answer"}}
+
+event: response.content_part.added
+data: {"type":"response.content_part.added","sequence_number":5,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"part":{"type":"output_text","text":"","annotations":[],"logprobs":[]}}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":6,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"delta":"„Hund“ heißt","logprobs":[],"obfuscation":"q8Zr"}
+
+: keep-alive
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":7,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"delta":" auf Japanisch 犬","logprobs":[],"obfuscation":"Lm"}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","sequence_number":8,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"delta":" (いぬ, inu).","logprobs":[],"obfuscation":"x0Tq3Wv"}
+
+event: response.output_text.done
+data: {"type":"response.output_text.done","sequence_number":9,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"text":"„Hund“ heißt auf Japanisch 犬 (いぬ, inu).","logprobs":[]}
+
+event: response.content_part.done
+data: {"type":"response.content_part.done","sequence_number":10,"item_id":"msg_0f3a91c2bb02","output_index":1,"content_index":0,"part":{"type":"output_text","text":"„Hund“ heißt auf Japanisch 犬 (いぬ, inu).","annotations":[],"logprobs":[]}}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":11,"output_index":1,"item":{"id":"msg_0f3a91c2bb02","type":"message","status":"completed","role":"assistant","content":[{"type":"output_text","text":"„Hund“ heißt auf Japanisch 犬 (いぬ, inu).","annotations":[],"logprobs":[]}],"phase":"final_answer"}}
+
+event: response.completed
+data: {"type":"response.completed","sequence_number":12,"response":{"id":"resp_0f3a91c2d4e5b6a7","object":"response","created_at":1761400200,"status":"completed","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[{"id":"rs_0f3a91c2aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1nQ2xv8WcTq0Lz3HfJ5yV7aBdE9gKmPuRtY1sXo4iC6eNlA2vB8jM0zQwU=","summary":[]},{"id":"msg_0f3a91c2bb02","type":"message","status":"completed","role":"assistant","content":[{"type":"output_text","text":"„Hund“ heißt auf Japanisch 犬 (いぬ, inu).","annotations":[],"logprobs":[]}],"phase":"final_answer"}],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":{"input_tokens":412,"input_tokens_details":{"cached_tokens":256},"output_tokens":62,"output_tokens_details":{"reasoning_tokens":24},"total_tokens":474},"metadata":{}}}
+

packages/halkyon_llm/test/fixtures/documented/openai-responses/tool.http

@@ -0,0 +1,45 @@
+HTTP 200
+content-type: text/event-stream; charset=utf-8
+
+event: response.created
+data: {"type":"response.created","sequence_number":0,"response":{"id":"resp_1c7e22d9f0a1b2c3","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.in_progress
+data: {"type":"response.in_progress","sequence_number":1,"response":{"id":"resp_1c7e22d9f0a1b2c3","object":"response","created_at":1761400200,"status":"in_progress","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":null,"metadata":{}}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":2,"output_index":0,"item":{"id":"rs_1c7e22d9aa01","type":"reasoning","encrypted_content":"gAAAAABo_Rk1","summary":[]}}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":3,"output_index":0,"item":{"id":"rs_1c7e22d9aa01","type":"reasoning","encrypted_content":"gAAAAABo_Sx9pL3mN7kT1bV5cX2zA8dF4gH6jK0qW=","summary":[]}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":4,"output_index":1,"item":{"id":"fc_1c7e22d9cc01","type":"function_call","status":"in_progress","arguments":"","call_id":"call_Hq2ZtX0aP4kLm9sB","name":"find_cards"}}
+
+event: response.function_call_arguments.delta
+data: {"type":"response.function_call_arguments.delta","sequence_number":5,"item_id":"fc_1c7e22d9cc01","output_index":1,"delta":"{\"query\":","obfuscation":"h0EQ"}
+
+event: response.function_call_arguments.delta
+data: {"type":"response.function_call_arguments.delta","sequence_number":6,"item_id":"fc_1c7e22d9cc01","output_index":1,"delta":"\"Hund\",\"limit\":5}","obfuscation":"h0EQ"}
+
+event: response.function_call_arguments.done
+data: {"type":"response.function_call_arguments.done","sequence_number":7,"item_id":"fc_1c7e22d9cc01","output_index":1,"arguments":"{\"query\":\"Hund\",\"limit\":5}"}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":8,"output_index":1,"item":{"id":"fc_1c7e22d9cc01","type":"function_call","status":"completed","arguments":"{\"query\":\"Hund\",\"limit\":5}","call_id":"call_Hq2ZtX0aP4kLm9sB","name":"find_cards"}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","sequence_number":9,"output_index":2,"item":{"id":"fc_1c7e22d9cc02","type":"function_call","status":"in_progress","arguments":"","call_id":"call_7DdmO9pD3xa9XTPN","name":"find_cards"}}
+
+event: response.function_call_arguments.delta
+data: {"type":"response.function_call_arguments.delta","sequence_number":10,"item_id":"fc_1c7e22d9cc02","output_index":2,"delta":"{\"query\":\"犬\"}","obfuscation":"h0EQ"}
+
+event: response.function_call_arguments.done
+data: {"type":"response.function_call_arguments.done","sequence_number":11,"item_id":"fc_1c7e22d9cc02","output_index":2,"arguments":"{\"query\":\"犬\"}"}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","sequence_number":12,"output_index":2,"item":{"id":"fc_1c7e22d9cc02","type":"function_call","status":"completed","arguments":"{\"query\":\"犬\"}","call_id":"call_7DdmO9pD3xa9XTPN","name":"find_cards"}}
+
+event: response.completed
+data: {"type":"response.completed","sequence_number":13,"response":{"id":"resp_1c7e22d9f0a1b2c3","object":"response","created_at":1761400200,"status":"completed","background":false,"error":null,"incomplete_details":null,"instructions":"Du hilfst beim Japanischlernen.","max_output_tokens":4096,"model":"gpt-6-astra-2026-09-30","output":[{"id":"rs_1c7e22d9aa01","type":"reasoning","encrypted_content":"gAAAAABo_Sx9pL3mN7kT1bV5cX2zA8dF4gH6jK0qW=","summary":[]},{"id":"fc_1c7e22d9cc01","type":"function_call","status":"completed","arguments":"{\"query\":\"Hund\",\"limit\":5}","call_id":"call_Hq2ZtX0aP4kLm9sB","name":"find_cards"},{"id":"fc_1c7e22d9cc02","type":"function_call","status":"completed","arguments":"{\"query\":\"犬\"}","call_id":"call_7DdmO9pD3xa9XTPN","name":"find_cards"}],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":"medium","summary":null},"safety_identifier":"p_8Zq3","store":false,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tools":[],"truncation":"disabled","usage":{"input_tokens":472,"input_tokens_details":{"cached_tokens":0},"output_tokens":89,"output_tokens_details":{"reasoning_tokens":64},"total_tokens":561},"metadata":{}}}
+

packages/halkyon_llm/test/fixtures/documented/openai/gemini_status_400.http

@@ -0,0 +1,4 @@
+HTTP 400
+content-type: application/json
+
+[{"error":{"code":400,"message":"Invalid JSON payload received. Unknown name \"store\": Cannot find field.","status":"INVALID_ARGUMENT"}}]

packages/halkyon_llm/test/fixtures/documented/openai/gemini_tool.http

@@ -0,0 +1,9 @@
+HTTP 200
+content-type: text/event-stream
+
+data: {"choices":[{"delta":{"content":"Ich sehe nach.","role":"assistant"},"index":0}],"created":1761400300,"id":"gR0qaZ6uNvqU","model":"gemini-3-flash","object":"chat.completion.chunk","usage":{"completion_tokens":4,"prompt_tokens":472,"total_tokens":540}}
+
+data: {"choices":[{"delta":{"role":"assistant","tool_calls":[{"extra_content":{"google":{"thought_signature":"CiQBcsjafQ=="}},"function":{"arguments":"{\"query\":\"Hund\",\"limit\":5}","name":"find_cards"},"id":"function-call-1","type":"function"}]},"finish_reason":"stop","index":0}],"created":1761400300,"id":"gR0qaZ6uNvqU","model":"gemini-3-flash","object":"chat.completion.chunk","usage":{"completion_tokens":21,"prompt_tokens":472,"total_tokens":561}}
+
+data: [DONE]
+

packages/halkyon_llm/test/fixtures/documented/openai/llamacpp_error.http

@@ -0,0 +1,7 @@
+HTTP 200
+content-type: text/event-stream
+
+data: {"choices":[{"finish_reason":null,"index":0,"delta":{"role":"assistant","content":null}}],"created":1761400500,"id":"chatcmpl-x3Yb","model":"gpt-oss-20b","system_fingerprint":"b6900","object":"chat.completion.chunk"}
+
+data: {"error":{"code":500,"message":"the request exceeds the available context size","type":"server_error"}}
+

packages/halkyon_llm/test/fixtures/documented/openai/mistral_status_422.http

@@ -0,0 +1,4 @@
+HTTP 422
+content-type: application/json
+
+{"object":"error","message":{"detail":[{"type":"extra_forbidden","loc":["body","messages",0,"content"],"msg":"Extra inputs are not permitted","input":"Mein geheimer Text"}]},"type":"invalid_request_message_error","param":null,"code":null}