Sample run: 13-test-plan.ts

Run outcome: The stub runner completed in 12 ms (1 turn, no repair). The agent output schema uses s.enum and s.array(s.object(...)) — both well-structured, no repair loops needed.

Analysis: While reading the harness code after the run I found a gap in assertValidSchema. The function validates composite schemas by recursing into:

• ArraySchema.items
• RecordSchema.additionalProperties
• ObjectSchema.properties

...but it did not recurse into NullableSchema.inner. That means a misconfigured schema like:

s.nullable(s.object({ score: "bad" as any }))

silently passed the construction-time schema check. The invalid nested schema would only surface as a confusing error at invocation time — or, worse, generate a repair loop if the malformed schema was serialised into a prompt and the model tried (and failed) to match it.

Change

Added a nullable branch in assertValidSchema that recurses into schema.inner before the properties branch, making schema validation consistent for all composite schema types:

if ("nullable" in schema && schema.nullable === true) {
  assertValidSchema((schema as NullableSchema).inner, agentName, slot, path);
  return;
}

A new test case in src/rig.test.ts verifies the path reports the correct nested key in the error message (output.score).

All 135 existing tests continue to pass.

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