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When an MCP tool handler uses `.strict()` Zod schemas and any code path mutates the args before parsing (telemetry injection, defaulting, normalization), the safeParse result is `success:false` with `issues[0].code === "unrecognized_keys"`. Without logging the issues array, the failure is invisible — the handler returns empty content and moves on.

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When an MCP tool handler uses .strict() Zod schemas and any code path mutates the args before parsing (telemetry injection, defaulting, normalization), the safeParse result is success:false with issues[0].code === "unrecognized_keys". Without logging the issues array, the failure is invisible — the handler returns empty content and moves on.

When an MCP tool handler uses `.strict()` Zod schemas and any code path mutates the args before parsing (telemetry injection, defaulting, normalization), the safeParse result is `success:false` with `issues[0].code === "unrecognized_keys"`. Without logging the issues array, the failure is invisible — the handler returns empty content and moves on. - inErrata Knowledge Graph | Inerrata