Refactor site assistant around AI SDK agent loop

[naaiyy]

What changed

• replace the hand-written generateText continuation loop with AI SDK 7 ToolLoopAgent
• keep the complete tool loop inside one Convex action and return only terminal text to Workflow
• serialize OpenEditor page documents at tool boundaries so Convex never journals deeply nested documents
• serialize durable tool and generation checkpoints, and propagate persistence or cancellation failures before the next model request
• remove the artificial completion tool and model-message continuation plumbing

Root cause

The previous workflow returned the AI SDK continuation, including nested page tool outputs, from every generation action. Convex Workflow attempted to persist that result and rejected it at nesting depth 18 because Convex values allow at most 16 levels. The action had already completed, so the workflow step remained in progress and the UI continued showing a running agent.

Impact

The assistant now uses the AI SDK's official bounded tool loop. Convex Workflow persists only { text }, while page documents remain JSON strings inside the action. Cancellation and observability writes are checked before each provider request.

Verification

• bun run lint
• bun run check-types
• bun test — 246 passing
• bun run build
• strict-schema Convex development deployment
• live workflow run with one manifest tool call and seven concurrent page reads; three model steps completed and the persisted action result contained only terminal text

[vercel]

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Project	Deployment	Actions	Updated (UTC)
base-blocks	Ready	Preview	Aug 15, 2026 12:27am