Why VoltAgent does not require "outputSchema" for createTool?

[danielyogel]

Is there a special reason for this "no output schema" API design?
Won't it make it easier for agents and workflows to know what result they except?

[omeraplak]

Hey @danielyogel ,
You’re absolutely right. there’s no special reason behind that design choice. I agree that adding an output schema could make things clearer and more robust.

Would you be interested in contributing a PR for it? If not, we’re happy to take care of it on our side too, just let us know what you prefer!

[danielyogel]

@omeraplak Thanks for the quick response, and thanks for this important framework.
I've opened a draft PR, but the main branch (fresh install) fails to build and also does not typecheck for me locally.

Feel free either to take ownership on this PR, close it, or give me more specific instructions.
Can not promise anything. Thanks again.

[omeraplak]

Absolutely, I’ll take it from here, thank you so much for your time and effort on this PR.
If possible, could you also share the specific build error you encountered? That would really help us fix it quickly.
Thanks again!

[danielyogel]

Build errors after clone, pnpm i, pnpm run build.

voltagent-example-with-voltagent-exporter:build

voltagent-example-with-workflow:build

voltagent-example-vercel-ai: > voltagent-example-vercel-ai@ build /Users/daniel/Code/spikes/voltagent/examples/with-vercel-ai
voltagent-example-vercel-ai: > tsc
voltagent-example-with-voice-openai: > voltagent-example-with-voice-openai@ build /Users/daniel/Code/spikes/voltagent/examples/with-voice-openai
voltagent-example-with-voice-openai: > tsc

voltagent-example-with-zapier-mcp:build

voltagent-example-with-voice-elevenlabs: > voltagent-example-with-voice-elevenlabs@ build /Users/daniel/Code/spikes/voltagent/examples/with-voice-elevenlabs
voltagent-example-with-voice-elevenlabs: > tsc
voltagent-example-with-voice-xsai: > voltagent-example-with-voice-xsai@ build /Users/daniel/Code/spikes/voltagent/examples/with-voice-xsai
voltagent-example-with-voice-xsai: > tsc
voltagent-example-with-voltagent-exporter: > voltagent-example-with-voltagent-exporter@ build /Users/daniel/Code/spikes/voltagent/examples/with-voltagent-exporter
voltagent-example-with-voltagent-exporter: > tsc
voltagent-example-sdk-trace: ../../node_modules/.pnpm/hono@4.7.7/node_modules/hono/dist/types/hono-base.d.ts(203,22): error TS2552: Cannot find name 'RequestInfo'. Did you mean 'RequestInit'?
voltagent-example-sdk-trace: ../../packages/core/dist/index.d.ts(4294,15): error TS2420: Class 'VoltOpsClient' incorrectly implements interface 'VoltOpsClient$1'.
voltagent-example-sdk-trace: Types of property 'exportHistoryEntry' are incompatible.
voltagent-example-sdk-trace: Type '((historyEntryData: ExportAgentHistoryPayload) => Promise<{ historyEntryId: string; }>) | undefined' is not assignable to type '(historyEntryData: ExportAgentHistoryPayload) => Promise<{ historyEntryId: string; }>'.
voltagent-example-sdk-trace: Type 'undefined' is not assignable to type '(historyEntryData: ExportAgentHistoryPayload) => Promise<{ historyEntryId: string; }>'.
voltagent-example-sdk-trace: ../../packages/core/dist/index.d.ts(6524,23): error TS2552: Cannot find name 'EventSourceInit'. Did you mean 'EventSource'?
voltagent-example-sdk-trace: ../../packages/core/dist/index.d.ts(6550,23): error TS2552: Cannot find name 'EventSourceInit'. Did you mean 'EventSource'?
voltagent-example-sdk-trace:  ELIFECYCLE  Command failed with exit code 2.
voltagent-example-with-workflow: > voltagent-example-with-workflow@ build /Users/daniel/Code/spikes/voltagent/examples/with-workflow
voltagent-example-with-workflow: > tsc
voltagent-example-with-zapier-mcp: > voltagent-example-with-zapier-mcp@1.0.0 build /Users/daniel/Code/spikes/voltagent/examples/with-zapier-mcp
voltagent-example-with-zapier-mcp: > tsc

———————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————

Lerna (powered by Nx) Running target build for 55 projects failed

Tasks not run because their dependencies failed or --nx-bail=true:

• voltagent-example-groq-ai:build
• voltagent-example-with-nextjs:build
• voltagent-example-with-supabase:build
• voltagent-example-xsai:build

Failed tasks:

• voltagent-example-sdk-trace:build

 ELIFECYCLE  Command failed with exit code 1.

[omeraplak]

Thank you, I'll release it soon outputSchema support

[danielyogel]

@omeraplak will watch your commit to understand better how I could contribute in the future. Thanks.

[omeraplak]

We'll release it soon 🎯