fix(otel): ensure nested context object creates separate attribute

[aayush-kapoor]

Background

for a nested runtime context defined as

runtimeContext: {
  userId: 'user-123',
  metadata: {
    tenant: 'acme',
    plan: 'pro',
  },
}

the spans we produced looked like

{
  'ai.settings.context.userId': 'user-123',
  'ai.settings.context.metadata': { tenant: 'acme', plan: 'pro' },
}

but the second attribute, which is an object, is not a valid OpenTelemetry span attribute value, so real OTel exporters drop it. Which would result in traces like

{
  'ai.settings.context.userId': 'user-123',
}

Summary

After the change, nested context is flattened into valid primitive attributes:

{
  'ai.settings.context.userId': 'user-123',
  'ai.settings.context.metadata.tenant': 'acme',
  'ai.settings.context.metadata.plan': 'pro',
}

Manual Verification

na

Checklist

• All commits are signed (PRs with unsigned commits cannot be merged)
• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)

[vercel]

Additional Suggestion:

Missing @opentelemetry/sdk-trace-base devDependency causes test file open-telemetry.test.ts to fail at import time with "Cannot find module" error.

[aayush-kapoor]

Additional Suggestion:

Missing @opentelemetry/sdk-trace-base devDependency causes test file open-telemetry.test.ts to fail at import time with "Cannot find module" error.

stale review

[github-actions]

🚀 Published in:

Package	Version
ai	7.0.0-canary.156 github npm
@ai-sdk/amazon-bedrock	5.0.0-canary.72 github npm
@ai-sdk/angular	3.0.0-canary.156 github npm
@ai-sdk/azure	4.0.0-canary.65 github npm
@ai-sdk/groq	4.0.0-canary.49 github npm
@ai-sdk/langchain	3.0.0-canary.156 github npm
@ai-sdk/llamaindex	3.0.0-canary.156 github npm
@ai-sdk/openai	4.0.0-canary.65 github npm
@ai-sdk/otel	1.0.0-canary.102 github npm
@ai-sdk/react	4.0.0-canary.158 github npm
@ai-sdk/rsc	3.0.0-canary.157 github npm
@ai-sdk/svelte	5.0.0-canary.156 github npm
@ai-sdk/vue	4.0.0-canary.156 github npm
@ai-sdk/workflow	1.0.0-canary.73 github npm