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fix(openai-compat): restrict developer/assistant/system/tool messages to text-only content (#2932)

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**What:**
- Added OpenAIChatCompletionTextOnlyMessageContent type for text-only
content validation
- Modified OpenAISystemMessageParam, OpenAIAssistantMessageParam,
OpenAIDeveloperMessageParam, and OpenAIToolMessageParam to use text-only
content type instead of mixed content
- OpenAIUserMessageParam unchanged - still accepts both text and images
- Updated OpenAPI spec files to reflect text-only content restrictions
in schemas

closes #2894 

**Why:**
- Enforces OpenAI API compatibility by restricting image content to user
messages only
- Prevents API misuse where images might be sent in message types that
don't support them
- Aligns with OpenAI's actual API behavior where only user messages can
contain multimodal content
- Improves type safety and validation at the API boundary

**Test plan:**
- Added comprehensive parametrized tests covering all 5 OpenAI message
types
- Tests verify text string acceptance for all message types
- Tests verify text list acceptance for all message types
- Tests verify image rejection for system/assistant/developer/tool
messages (ValidationError expected)
- Tests verify user messages still accept images (backward compatibility
maintained)
This commit is contained in:
Matthew Farrellee 2025-07-28 13:36:34 -04:00 • committed by GitHub
parent 60bb5e307e
commit 968fc132d3
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4 changed files with 88 additions and 12 deletions
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8
docs/_static/llama-stack-spec.html vendored
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@ -9770,7 +9770,7 @@
{
"type": "array",
"items": {
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartParam"
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartTextParam"
}
}
],
@ -9955,7 +9955,7 @@
{
"type": "array",
"items": {
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartParam"
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartTextParam"
}
}
],
@ -10036,7 +10036,7 @@
{
"type": "array",
"items": {
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartParam"
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartTextParam"
}
}
],
@ -10107,7 +10107,7 @@
{
"type": "array",
"items": {
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartParam"
"$ref": "#/components/schemas/OpenAIChatCompletionContentPartTextParam"
}
}
],