fix(agent): keep browser tool schema object-based

[iamjr15]

Why

Anthropic rejects top-level union tool schemas before inference. The browser action contract became a Zod union, which serialized without a top-level JSON Schema object and caused every app-builder run to retry the same deterministic provider error for roughly 42 seconds before failing.

What changed

• expose one strict top-level object schema to model providers
• retain method-specific validation against the canonical browser driver union
• omit placeholder null fields while preserving exact action requirements

Verification

• pnpm lint
• pnpm typecheck
• pnpm turbo build --force
• pnpm deadcode
• pnpm architecture:check
• pnpm turbo skills:build
• converted the tool schema with Zod and verified type: object
• verified click/fill inputs pass and incomplete/unknown-field inputs fail

Production browser acceptance will run after merge and deployment.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
cheatcode	Skipped		Aug 12, 2026 9:10pm