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fix: sanitize tool JSON schemas for Claude API compatibility #13619

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fix: sanitize tool JSON schemas for Claude API compatibility #13619

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e9a7952
fix: sanitize tool JSON schemas for Claude API compatibility
1186258278 Feb 14, 2026
005ef26
Merge branch 'dev' into fix/claude-schema-validation
1186258278 Feb 15, 2026
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15 changes: 15 additions & 0 deletions packages/opencode/src/provider/transform.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -851,6 +851,21 @@ export namespace ProviderTransform {
}

export function schema(model: Provider.Model, schema: JSONSchema.BaseSchema | JSONSchema7): JSONSchema7 {
// Strip $schema meta field from Zod 4 toJSONSchema() output.
// Claude API's input_schema rejects this field.
if ("$schema" in schema) {
const { $schema: _, ...rest } = schema as any
schema = rest as JSONSchema.BaseSchema
}

// Claude API (especially thinking models) requires the "required" field
// to be present when "properties" exists, even if it's an empty array.
// Without this, the API returns "JSON schema is invalid" errors.
const s = schema as any
if (s.type === "object" && s.properties && !s.required) {
s.required = []
}

/*
if (["openai", "azure"].includes(providerID)) {
if (schema.type === "object" && schema.properties) {
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