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fix(gemini): backfill thoughtSignature and suppress stream done sentinel

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Backfill DEFAULT_THINKING_AG_SIGNATURE onto functionCall parts missing it
(client history replay) and on Claude tool_use blocks, fixing 400
INVALID_ARGUMENT from Gemini-family APIs. Suppress the OpenAI-style
data: [DONE] sentinel for antigravity/gemini/vertex to avoid parser crashes.

Fixes #2193.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
WARELIK
2026-06-29 15:27:05 +07:00
committed by decolua
parent 319caa2d7b
commit 2d94fffe3b
3 changed files with 19 additions and 4 deletions
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16
open-sse/executors/antigravity.js
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@@ -6,6 +6,7 @@ import { HTTP_STATUS } from "../config/runtimeConfig.js";
import { resolveSessionId } from "../utils/sessionManager.js";
import { proxyAwareFetch } from "../utils/proxyFetch.js";
import { cleanJSONSchemaForAntigravity } from "../translator/formats/gemini.js";
import { DEFAULT_THINKING_AG_SIGNATURE } from "../config/defaultThinkingSignature.js";
// Sanitize function name: Gemini requires [a-zA-Z_][a-zA-Z0-9_.:\-]{0,63}
function sanitizeFunctionName(name) {
@@ -177,8 +178,19 @@ export class AntigravityExecutor extends BaseExecutor {
if (p.thoughtSignature && !p.functionCall && !p.text) return false;
return true;
});
if (role !== c.role || parts?.length !== c.parts?.length) {
return { ...c, role, parts };
// Gemini 3+ rejects functionCall parts without thoughtSignature. Clients (Claude Code, IDE)
// don't persist thoughtSignature in their history, so backfill the default signature on any
// functionCall part that arrives without one.
const needsBackfill = parts?.some(p => p.functionCall && !p.thoughtSignature) ?? false;
if (role !== c.role || parts?.length !== c.parts?.length || needsBackfill) {
return {
...c, role,
parts: needsBackfill
? parts.map(p => (p.functionCall && !p.thoughtSignature)
? { ...p, thoughtSignature: DEFAULT_THINKING_AG_SIGNATURE }
: p)
: parts,
};
}
return c;
});