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Fix incorrect formatting in OpenAI responses API for tool #125

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Fix incorrect formatting in OpenAI responses API for tool #125

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457c634
Fix format mismatch in OpenAI responses API
noorbhatia Feb 12, 2026
7da8fa9
Rewrite expressions to improve clarity
mattt Feb 17, 2026
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83 changes: 42 additions & 41 deletions Sources/AnyLanguageModel/Models/OpenAILanguageModel.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1050,59 +1050,60 @@ private enum Responses {
outputs.append(object)

case .tool(let id):
let toolMessage = msg
// Wrap user content into a single top-level message as required by Responses API
var contentBlocks: [JSONValue]
switch toolMessage.content {
let outputValue: JSONValue
switch msg.content {
case .text(let text):
contentBlocks = [
.object(["type": .string("input_text"), "text": .string(text)])
]
outputValue = .string(text)
case .blocks(let blocks):
contentBlocks = blocks.map { block in
switch block {
case .text(let text):
return .object(["type": .string("input_text"), "text": .string(text)])
case .imageURL(let url):
return .object([
"type": .string("input_image"),
"image_url": .object(["url": .string(url)]),
])
outputValue = .array(
blocks.map { block in
switch block {
case .text(let text):
return .object(["type": .string("input_text"), "text": .string(text)])
case .imageURL(let url):
return .object([
"type": .string("input_image"),
"image_url": .string(url),
])
}
}
}
}
let outputString: String
if contentBlocks.count > 1 {
let encoder = JSONEncoder()
if let data = try? encoder.encode(JSONValue.array(contentBlocks)),
let str = String(data: data, encoding: .utf8)
{
outputString = str
} else {
outputString = "[]"
}
} else if let block = contentBlocks.first {
let encoder = JSONEncoder()
if let data = try? encoder.encode(block),
let str = String(data: data, encoding: .utf8)
{
outputString = str
} else {
outputString = "{}"
}
} else {
outputString = "{}"
)
}
outputs.append(
.object([
"type": .string("function_call_output"),
"call_id": .string(id),
"output": .string(outputString),
"output": outputValue,
])
)

case .raw(rawContent: let rawContent):
outputs.append(rawContent)
// Convert Chat Completions assistant+tool_calls to Responses API function_call items
if case .object(let assistantMessageObject) = rawContent,
case .string(let messageRole) = assistantMessageObject["role"],
messageRole == "assistant",
case .array(let assistantToolCalls) = assistantMessageObject["tool_calls"]
{
for assistantToolCall in assistantToolCalls {
if case .object(let toolCallObject) = assistantToolCall,
case .string(let toolCallID) = toolCallObject["id"],
case .object(let functionCallObject) = toolCallObject["function"],
case .string(let functionName) = functionCallObject["name"],
case .string(let functionArguments) = functionCallObject["arguments"]
{
outputs.append(
.object([
"type": .string("function_call"),
"call_id": .string(toolCallID),
"name": .string(functionName),
"arguments": .string(functionArguments),
])
)
}
}
} else {
outputs.append(rawContent)
}

case .system:
let systemMessage = msg
Expand Down