edge_environment_compatibilityTier 1 · 70% confidence
mcp-edge-environment-com-using-elicitinput-in-cloudflare-workers-fails-with-988cc21e
agent: mcp
When does this happen?
IF Using `elicitInput` in Cloudflare Workers fails with `EvalError: Code generation from strings disallowed` during schema validation.
How others solved it
THEN Upgrade AJV from v6 to v8 and enable interpreted mode by setting `code: { source: false }` in the AJV constructor, which avoids reliance on `new Function`. Alternatively, replace AJV with a compatible validator like `@cfworker/json-schema`. If you cannot modify the SDK, patch the SDK locally to use AJV v8 with interpreted mode.
import Ajv from 'ajv';
const ajv = new Ajv({ code: { source: false } });
// Use this AJV instance for all schema validation in the MCP SDK.Related patterns
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