fix: support tools with optional context

[lgrammel]

Background

Tools with optional context schemas and with context schemas that only contained optional parameters were rejected with type errors on toolsContext.

Summary

Fix tool context type inference.

[github-actions]

🚀 Published in:

Package	Version
ai	7.0.0-canary.139
@ai-sdk/alibaba	2.0.0-canary.50
@ai-sdk/amazon-bedrock	5.0.0-canary.62
@ai-sdk/angular	3.0.0-canary.139
@ai-sdk/anthropic	4.0.0-canary.55
@ai-sdk/assemblyai	3.0.0-canary.43
@ai-sdk/azure	4.0.0-canary.58
@ai-sdk/baseten	2.0.0-canary.48
@ai-sdk/black-forest-labs	2.0.0-canary.42
@ai-sdk/bytedance	2.0.0-canary.43
@ai-sdk/cerebras	3.0.0-canary.48
@ai-sdk/cohere	4.0.0-canary.45
@ai-sdk/deepgram	3.0.0-canary.42
@ai-sdk/deepinfra	3.0.0-canary.48
@ai-sdk/deepseek	3.0.0-canary.46
@ai-sdk/elevenlabs	3.0.0-canary.42
@ai-sdk/fal	3.0.0-canary.42
@ai-sdk/fireworks	3.0.0-canary.48
@ai-sdk/gateway	4.0.0-canary.82
@ai-sdk/gladia	3.0.0-canary.42
@ai-sdk/google	4.0.0-canary.63
@ai-sdk/google-vertex	5.0.0-canary.82
@ai-sdk/groq	4.0.0-canary.45
@ai-sdk/huggingface	2.0.0-canary.48
@ai-sdk/hume	3.0.0-canary.42
@ai-sdk/klingai	4.0.0-canary.43
@ai-sdk/langchain	3.0.0-canary.139
@ai-sdk/llamaindex	3.0.0-canary.139
@ai-sdk/lmnt	3.0.0-canary.42
@ai-sdk/luma	3.0.0-canary.42
@ai-sdk/mcp	2.0.0-canary.50
@ai-sdk/mistral	4.0.0-canary.47
@ai-sdk/moonshotai	3.0.0-canary.48
@ai-sdk/open-responses	2.0.0-canary.45
@ai-sdk/openai	4.0.0-canary.58
@ai-sdk/openai-compatible	3.0.0-canary.48
@ai-sdk/otel	1.0.0-canary.85
@ai-sdk/perplexity	4.0.0-canary.45
@ai-sdk/prodia	2.0.0-canary.45
@ai-sdk/provider-utils	5.0.0-canary.41
@ai-sdk/react	4.0.0-canary.140
@ai-sdk/replicate	3.0.0-canary.43
@ai-sdk/revai	3.0.0-canary.43
@ai-sdk/rsc	3.0.0-canary.140
@ai-sdk/svelte	5.0.0-canary.139
@ai-sdk/togetherai	3.0.0-canary.48
@ai-sdk/valibot	3.0.0-canary.41
@ai-sdk/vercel	3.0.0-canary.48
@ai-sdk/voyage	2.0.0-canary.16
@ai-sdk/vue	4.0.0-canary.139
@ai-sdk/workflow	1.0.0-canary.56
@ai-sdk/xai	4.0.0-canary.63