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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075

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Summary

Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.

The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.

Test plan

  • npm run build passes
  • node scripts/generate-schema.mjs succeeds

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LGTM. The change is minimal and correct:

  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.

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🔵Branches39.82%5769 / 14486
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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Coverage Report
StatusCategoryPercentageCovered / Total
🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
Generated in workflow #2262 for commit 37846f6 by the Vitest Coverage Report Action
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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fix/zod-json-schema-compat
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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Coverage Report
StatusCategoryPercentageCovered / Total
🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
Generated in workflow #2262 for commit 37846f6 by the Vitest Coverage Report Action
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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StatusCategoryPercentageCovered / Total
🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
Generated in workflow #2262 for commit 37846f6 by the Vitest Coverage Report Action
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'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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var __re = new RegExp('^' + "youtube\\.com" + '
fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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StatusCategoryPercentageCovered / Total
🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
Generated in workflow #2262 for commit 37846f6 by the Vitest Coverage Report Action
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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🔵Lines42.89%8936 / 20830
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, 'i');
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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StatusCategoryPercentageCovered / Total
🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
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fix: replace z.undefined() with z.never() for JSON Schema compat by notgitika · Pull Request #1075 · aws/agentcore-cli · GitHub
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fix: replace z.undefined() with z.never() for JSON Schema compat - #1075
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fix: replace z.undefined() with z.never() for JSON Schema compat#1075
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Summary
Fixes Zod JSON Schema generation failure: z.undefined() cannot be represented in JSON Schema.
The AB test variant XOR union used z.undefined().optional() to exclude the alternate field. Replace with z.never().optional() which Zod can serialize.
Test plan
  • npm run build passes
  • node scripts/generate-schema.mjs succeeds
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LGTM. The change is minimal and correct:
  • z.undefined() has no JSON Schema representation in Zod v4's z.toJSONSchema(), which is why generate-schema.mjs was failing.
  • z.never().optional() serializes cleanly (as { "not": {} } on an optional property) and preserves the XOR semantics: the field must be absent/undefined, and any defined value is rejected on the inner schema. Combined with the union, an object with both fields set fails both branches, so mutual exclusivity still holds.
  • No need to regenerate schemas/agentcore.schema.v1.json in this PR — the repo's release workflow regenerates it, and direct edits to schemas/ are rejected by CI outside release PRs.
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🔵Lines42.89%8936 / 20830
🔵Statements42.17%9485 / 22491
🔵Functions39.66%1537 / 3875
🔵Branches39.82%5769 / 14486
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