feat(llm): pass strict through tool definitions for Codex parity (#33392)

packages/llm/src/protocols/openai-responses.ts

@@ -258,6 +258,8 @@ const lowerTool = (tool: ToolDefinition): OpenAIResponsesTool => ({
   name: tool.name,
   description: tool.description,
   parameters: ProviderShared.openAiToolInputSchema(tool.inputSchema),
+  // TODO: Read this from OpenAI-specific tool options so direct LLM callers can opt into strict schemas.
+  strict: false,
 })
 
 const lowerToolChoice = (toolChoice: NonNullable<LLMRequest["toolChoice"]>) =>

packages/llm/test/fixtures/recordings/openai-responses/gpt-5-5-drives-a-tool-loop.json

@@ -22,7 +22,7 @@
         "headers": {
           "content-type": "application/json"
         },
-        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Use the get_weather tool, then answer in one short sentence.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"What is the weather in Paris?\"}]}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false}}],\"stream\":true,\"max_output_tokens\":80}"
+        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Use the get_weather tool, then answer in one short sentence.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"What is the weather in Paris?\"}]}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false},\"strict\":false}],\"stream\":true,\"max_output_tokens\":80}"
       },
       "response": {
         "status": 200,
@@ -40,7 +40,7 @@
         "headers": {
           "content-type": "application/json"
         },
-        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Use the get_weather tool, then answer in one short sentence.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"What is the weather in Paris?\"}]},{\"type\":\"function_call\",\"call_id\":\"call_JCuVTkQxVB3cCmFWx52adJKZ\",\"name\":\"get_weather\",\"arguments\":\"{\\\"city\\\":\\\"Paris\\\"}\"},{\"type\":\"function_call_output\",\"call_id\":\"call_JCuVTkQxVB3cCmFWx52adJKZ\",\"output\":\"{\\\"temperature\\\":22,\\\"condition\\\":\\\"sunny\\\"}\"}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false}}],\"stream\":true,\"max_output_tokens\":80}"
+        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Use the get_weather tool, then answer in one short sentence.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"What is the weather in Paris?\"}]},{\"type\":\"function_call\",\"call_id\":\"call_JCuVTkQxVB3cCmFWx52adJKZ\",\"name\":\"get_weather\",\"arguments\":\"{\\\"city\\\":\\\"Paris\\\"}\"},{\"type\":\"function_call_output\",\"call_id\":\"call_JCuVTkQxVB3cCmFWx52adJKZ\",\"output\":\"{\\\"temperature\\\":22,\\\"condition\\\":\\\"sunny\\\"}\"}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false},\"strict\":false}],\"stream\":true,\"max_output_tokens\":80}"
       },
       "response": {
         "status": 200,

packages/llm/test/fixtures/recordings/openai-responses/gpt-5-5-streams-tool-call.json

@@ -14,7 +14,7 @@
         "headers": {
           "content-type": "application/json"
         },
-        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Call tools exactly as requested.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"Call get_weather with city exactly Paris.\"}]}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false}}],\"tool_choice\":{\"type\":\"function\",\"name\":\"get_weather\"},\"stream\":true,\"max_output_tokens\":80}"
+        "body": "{\"model\":\"gpt-5.5\",\"input\":[{\"role\":\"system\",\"content\":\"Call tools exactly as requested.\"},{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"Call get_weather with city exactly Paris.\"}]}],\"tools\":[{\"type\":\"function\",\"name\":\"get_weather\",\"description\":\"Get current weather for a city.\",\"parameters\":{\"type\":\"object\",\"properties\":{\"city\":{\"type\":\"string\"}},\"required\":[\"city\"],\"additionalProperties\":false},\"strict\":false}],\"tool_choice\":{\"type\":\"function\",\"name\":\"get_weather\"},\"stream\":true,\"max_output_tokens\":80}"
       },
       "response": {
         "status": 200,

packages/llm/test/provider/openai-responses.test.ts

@@ -115,6 +115,7 @@ describe("OpenAI Responses route", () => {
           type: "function",
           name: "read",
           description: "Read a path or resource.",
+          strict: false,
           parameters: {
             type: "object",
             properties: {