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Fix Gemini API error with integer enum in tool parameters (#760)

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Gemini API returns 400 error when tools have enum constraints on integer/number types:
"enum: only allowed for STRING type"

This fix removes enum constraints for integer and number types in JSON schemas
before sending to Gemini API, while keeping enum for string types.

Fixes tools like mcp__pointer__get-pointed-element that use integer enums
for cssLevel and textDetail parameters.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
LASTHXH
2026-03-29 21:21:51 +05:00
committed by GitHub
parent 93bbe8e7a8
commit 9fc3845d92
1 changed files with 9 additions and 3 deletions
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12
open-sse/translator/helpers/geminiHelper.ts
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@@ -167,13 +167,19 @@ function convertConstToEnum(obj) {
}
// Convert enum values to strings (Gemini requires string enum values)
// For integer types, remove enum entirely as Gemini doesn't support it
function convertEnumValuesToStrings(obj) {
if (!obj || typeof obj !== "object") return;
if (obj.enum && Array.isArray(obj.enum)) {
obj.enum = obj.enum.map((v) => String(v));
if (!obj.type) {
obj.type = "string";
// Gemini only supports enum for string types, not integer
if (obj.type === "integer" || obj.type === "number") {
delete obj.enum;
} else {
obj.enum = obj.enum.map((v) => String(v));
if (!obj.type) {
obj.type = "string";
}
}
}