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fix(antigravity): sanitize competing-client branding in system prompts

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Antigravity flags requests whose system prompt identifies another vendor's
client and answers 429 Quota Exhausted. Move the existing Zed/Claude prompt
rewrite into a config-driven rule table and add case-preserving opencode ->
antigravity mapping.

Applied in the executor so only Antigravity requests are rewritten - the
shared openai-to-gemini translator also serves gemini, gemini-cli, vertex
and zed, which must not be touched.
This commit is contained in:
Ahoora5678
2026-08-28 16:57:30 +07:00
parent 88676b3037
commit dff648496c
2 changed files with 13 additions and 6 deletions
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12
open-sse/executors/antigravity.js
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@@ -1,7 +1,7 @@
import crypto from "crypto";
import { BaseExecutor } from "./base.js";
import { PROVIDERS } from "../config/providers.js";
import { OAUTH_ENDPOINTS, ANTIGRAVITY_HEADERS, AG_DEFAULT_TOOLS, AG_TOOL_SUFFIX } from "../config/appConstants.js";
import { OAUTH_ENDPOINTS, ANTIGRAVITY_HEADERS, AG_DEFAULT_TOOLS, AG_TOOL_SUFFIX, ANTIGRAVITY_PROMPT_REWRITES } from "../config/appConstants.js";
import { HTTP_STATUS } from "../config/runtimeConfig.js";
import { resolveSessionId } from "../utils/sessionManager.js";
import { proxyAwareFetch } from "../utils/proxyFetch.js";
@@ -246,13 +246,13 @@ export class AntigravityExecutor extends BaseExecutor {
const { tools: _originalTools, toolConfig: _originalToolConfig, ...requestWithoutTools } = body.request || {};
stripBlacklisted(requestWithoutTools);
// Rewrite competitive system prompts (e.g. Zed IDE's Claude prompt) to prevent Antigravity from
// flagging the request and immediately blocking it with a 429 Quota Exhausted response.
// Rewrite competing-client branding in system prompts (e.g. Zed's Claude prompt,
// OpenCode naming) so Antigravity doesn't flag the request with a 429 Quota Exhausted.
if (requestWithoutTools.systemInstruction?.parts) {
const oldText = "You are a Claude agent, built on Anthropic's Claude Agent SDK.";
for (const part of requestWithoutTools.systemInstruction.parts) {
if (typeof part.text === "string" && part.text.includes(oldText)) {
part.text = part.text.split(oldText).join("");
if (typeof part.text !== "string") continue;
for (const { from, to } of ANTIGRAVITY_PROMPT_REWRITES) {
part.text = part.text.replaceAll(from, to);
}
}
}