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fix(mastra): transform LLM input/output for Braintrust Thread view #2213

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14 changes: 14 additions & 0 deletions .changeset/mastra-thread-view-llm-io.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
---
"braintrust": patch
---

fix(mastra): Transform LLM input/output for the Braintrust Thread view

`MODEL_GENERATION` spans from the Mastra observability exporter now log input
as a bare chat-message array (unwrapping Mastra's `{ messages: [...] }`
container, or wrapping a single `{ role, content }` object) and output as an
`{ role: 'assistant', content }` message (unwrapping Mastra's `{ text, ... }`),
so Braintrust's Thread view renders the conversation correctly. Non-model spans
are unchanged.

Ports mastra-ai/mastra#10794 (fixes #9848).
90 changes: 44 additions & 46 deletions e2e/scenarios/mastra-instrumentation/__snapshots__/mastra-v1260.log-payloads.json
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Original file line number Diff line number Diff line change
Expand Up @@ -31,28 +31,26 @@
"type": "task"
},
{
"input": {
"messages": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "What is the weather in Paris?",
"type": "text"
}
],
"role": "user"
}
]
},
"input": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "What is the weather in Paris?",
"type": "text"
}
],
"role": "user"
}
],
"metadata": {
"entity_id": "weather-agent",
"entity_name": "Weather Agent",
Expand All @@ -67,10 +65,11 @@
],
"name": "llm: 'mock-model-id'",
"output": {
"content": "The forecast is sunny.",
"files": [],
"reasoning": [],
"role": "assistant",
"sources": [],
"text": "The forecast is sunny.",
"warnings": []
},
"type": "llm"
Expand Down Expand Up @@ -131,28 +130,26 @@
"type": "task"
},
{
"input": {
"messages": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "Stream the Paris forecast.",
"type": "text"
}
],
"role": "user"
}
]
},
"input": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "Stream the Paris forecast.",
"type": "text"
}
],
"role": "user"
}
],
"metadata": {
"entity_id": "weather-agent",
"entity_name": "Weather Agent",
Expand All @@ -167,10 +164,11 @@
],
"name": "llm: 'mock-model-id'",
"output": {
"content": "The forecast is sunny.",
"files": [],
"reasoning": [],
"role": "assistant",
"sources": [],
"text": "The forecast is sunny.",
"warnings": []
},
"type": "llm"
Expand Down
90 changes: 44 additions & 46 deletions e2e/scenarios/mastra-instrumentation/__snapshots__/mastra-v1260.span-tree.json
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Original file line number Diff line number Diff line change
Expand Up @@ -49,33 +49,32 @@
]
}
],
"input": {
"messages": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "What is the weather in Paris?",
"type": "text"
}
],
"role": "user"
}
]
},
"input": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "What is the weather in Paris?",
"type": "text"
}
],
"role": "user"
}
],
"output": {
"content": "The forecast is sunny.",
"files": [],
"reasoning": [],
"role": "assistant",
"sources": [],
"text": "The forecast is sunny.",
"warnings": []
},
"metadata": {
Expand Down Expand Up @@ -145,33 +144,32 @@
]
}
],
"input": {
"messages": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "Stream the Paris forecast.",
"type": "text"
}
],
"role": "user"
}
]
},
"input": [
{
"content": "Answer weather questions with the provided mock forecast.",
"role": "system"
},
{
"content": [
{
"providerOptions": {
"mastra": {
"createdAt": 0
}
},
"text": "Stream the Paris forecast.",
"type": "text"
}
],
"role": "user"
}
],
"output": {
"content": "The forecast is sunny.",
"files": [],
"reasoning": [],
"role": "assistant",
"sources": [],
"text": "The forecast is sunny.",
"warnings": []
},
"metadata": {
Expand Down
90 changes: 44 additions & 46 deletions e2e/scenarios/mastra-instrumentation/__snapshots__/mastra-v1260.span-tree.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -19,33 +19,32 @@ span_tree:
│ │ "entity_type": "agent"
│ │ }
│ │ └── llm: 'mock-model-id' [llm]
│ │ input: {
│ │ "messages": [
│ │ {
│ │ "content": "Answer weather questions with the provided mock forecast.",
│ │ "role": "system"
│ │ },
│ │ {
│ │ "content": [
│ │ {
│ │ "providerOptions": {
│ │ "mastra": {
│ │ "createdAt": 0
│ │ }
│ │ },
│ │ "text": "What is the weather in Paris?",
│ │ "type": "text"
│ │ }
│ │ ],
│ │ "role": "user"
│ │ }
│ │ ]
│ │ }
│ │ input: [
│ │ {
│ │ "content": "Answer weather questions with the provided mock forecast.",
│ │ "role": "system"
│ │ },
│ │ {
│ │ "content": [
│ │ {
│ │ "providerOptions": {
│ │ "mastra": {
│ │ "createdAt": 0
│ │ }
│ │ },
│ │ "text": "What is the weather in Paris?",
│ │ "type": "text"
│ │ }
│ │ ],
│ │ "role": "user"
│ │ }
│ │ ]
│ │ output: {
│ │ "content": "The forecast is sunny.",
│ │ "files": [],
│ │ "reasoning": [],
│ │ "role": "assistant",
│ │ "sources": [],
│ │ "text": "The forecast is sunny.",
│ │ "warnings": []
│ │ }
│ │ metadata: {
Expand Down Expand Up @@ -96,33 +95,32 @@ span_tree:
│ │ "entity_type": "agent"
│ │ }
│ │ └── llm: 'mock-model-id' [llm]
│ │ input: {
│ │ "messages": [
│ │ {
│ │ "content": "Answer weather questions with the provided mock forecast.",
│ │ "role": "system"
│ │ },
│ │ {
│ │ "content": [
│ │ {
│ │ "providerOptions": {
│ │ "mastra": {
│ │ "createdAt": 0
│ │ }
│ │ },
│ │ "text": "Stream the Paris forecast.",
│ │ "type": "text"
│ │ }
│ │ ],
│ │ "role": "user"
│ │ }
│ │ ]
│ │ }
│ │ input: [
│ │ {
│ │ "content": "Answer weather questions with the provided mock forecast.",
│ │ "role": "system"
│ │ },
│ │ {
│ │ "content": [
│ │ {
│ │ "providerOptions": {
│ │ "mastra": {
│ │ "createdAt": 0
│ │ }
│ │ },
│ │ "text": "Stream the Paris forecast.",
│ │ "type": "text"
│ │ }
│ │ ],
│ │ "role": "user"
│ │ }
│ │ ]
│ │ output: {
│ │ "content": "The forecast is sunny.",
│ │ "files": [],
│ │ "reasoning": [],
│ │ "role": "assistant",
│ │ "sources": [],
│ │ "text": "The forecast is sunny.",
│ │ "warnings": []
│ │ }
│ │ metadata: {
Expand Down
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