Merge branch 'pr-779-review'

open-sse/executors/antigravity.js

@@ -5,8 +5,18 @@ import { OAUTH_ENDPOINTS, ANTIGRAVITY_HEADERS, INTERNAL_REQUEST_HEADER, AG_DEFAU
 import { HTTP_STATUS } from "../config/runtimeConfig.js";
 import { deriveSessionId } from "../utils/sessionManager.js";
 import { proxyAwareFetch } from "../utils/proxyFetch.js";
+import { cleanJSONSchemaForAntigravity } from "../translator/helpers/geminiHelper.js";
+
+// Sanitize function name: Gemini requires [a-zA-Z_][a-zA-Z0-9_.:\-]{0,63}
+function sanitizeFunctionName(name) {
+  if (!name) return "_unknown";
+  let s = name.replace(/[^a-zA-Z0-9_.:\-]/g, "_");
+  if (!/^[a-zA-Z_]/.test(s)) s = "_" + s;
+  return s.substring(0, 64);
+}
 
 const MAX_RETRY_AFTER_MS = 10000;
+const MAX_ANTIGRAVITY_OUTPUT_TOKENS = 16384;
 
 export class AntigravityExecutor extends BaseExecutor {
   constructor() {
@@ -53,14 +63,44 @@ export class AntigravityExecutor extends BaseExecutor {
       return c;
     });
 
+    // Sanitize tool schemas and function names before sending to Antigravity.
+    let tools = body.request?.tools;
+
+    if (tools && tools.length > 0) {
+      tools = tools
+        .map(group => {
+          if (!group.functionDeclarations) return group;
+          const cleanedDeclarations = group.functionDeclarations.map(fn => ({
+            ...fn,
+            name: sanitizeFunctionName(fn.name),
+            parameters: fn.parameters
+              ? cleanJSONSchemaForAntigravity(structuredClone(fn.parameters))
+              : { type: "object", properties: { reason: { type: "string", description: "Brief explanation" } }, required: ["reason"] }
+          }));
+
+          return {
+            ...group,
+            functionDeclarations: cleanedDeclarations
+          };
+        })
+        .filter(group => group.functionDeclarations?.length > 0)
+        .slice(0, 1);
+    }
+
+    const { tools: _originalTools, toolConfig: _originalToolConfig, ...requestWithoutTools } = body.request || {};
+    const generationConfig = { ...(requestWithoutTools.generationConfig || {}) };
+    if (generationConfig.maxOutputTokens > MAX_ANTIGRAVITY_OUTPUT_TOKENS) {
+      generationConfig.maxOutputTokens = MAX_ANTIGRAVITY_OUTPUT_TOKENS;
+    }
+
     const transformedRequest = {
-      ...body.request,
+      ...requestWithoutTools,
+      generationConfig,
       ...(contents && { contents }),
+      ...(tools && { tools }),
       sessionId: body.request?.sessionId || deriveSessionId(credentials?.email || credentials?.connectionId),
       safetySettings: undefined,
-      toolConfig: body.request?.tools?.length > 0
+      ...(tools?.length > 0 && { toolConfig: { functionCallingConfig: { mode: "VALIDATED" } } })
-        ? { functionCallingConfig: { mode: "VALIDATED" } }
-        : body.request?.toolConfig
     };
 
     return {
@@ -263,21 +303,34 @@ export class AntigravityExecutor extends BaseExecutor {
    * - Inject AG default decoy tools after client tools
    * Returns { cloakedBody, toolNameMap } where toolNameMap maps suffixed → original
    */
-  static cloakTools(body) {
+  static cloakTools(body, clientTool = null) {
     const tools = body.request?.tools;
     if (!tools || tools.length === 0) {
       return { cloakedBody: body, toolNameMap: null };
     }
 
+    const isCopilot = clientTool === "github-copilot";
     const toolNameMap = new Map();
     const clientDeclarations = [];
+    const decoyNames = new Set(AG_DECOY_TOOLS.map(tool => tool.name));
 
     // First: collect renamed client tools
     for (const toolGroup of tools) {
       if (!toolGroup.functionDeclarations) continue;
 
       for (const func of toolGroup.functionDeclarations) {
-        // Skip if already an AG default tool name
+        // For GitHub Copilot, avoid emitting duplicate native Antigravity tool names.
+        // Keep the decoys only once in the final declaration list.
+        if (isCopilot && AG_DEFAULT_TOOLS.has(func.name)) {
+          continue;
+        }
+
+        // Skip if already covered by decoys for Copilot
+        if (isCopilot && decoyNames.has(func.name)) {
+          continue;
+        }
+
+        // Preserve native AG names for non-Copilot clients
         if (AG_DEFAULT_TOOLS.has(func.name)) {
           clientDeclarations.push(func);
           continue;
@@ -290,7 +343,13 @@ export class AntigravityExecutor extends BaseExecutor {
     }
 
     // Client tools first, then AG decoy tools
-    const allDeclarations = [...clientDeclarations, ...AG_DECOY_TOOLS];
+    const allDeclarations = [];
+    const seenNames = new Set();
+    for (const decl of [...clientDeclarations, ...AG_DECOY_TOOLS]) {
+      if (!decl?.name || seenNames.has(decl.name)) continue;
+      seenNames.add(decl.name);
+      allDeclarations.push(decl);
+    }
 
     // Rename tool names in conversation history (contents)
     const cloakedContents = body.request?.contents?.map(msg => {

open-sse/handlers/chatCore.js

@@ -82,7 +82,7 @@ export async function handleChatCore({ body, modelInfo, credentials, log, onCred
     log?.debug?.("PASSTHROUGH", `${clientTool} → ${provider} | native lossless`);
     translatedBody = { ...body, model };
   } else {
-    translatedBody = translateRequest(sourceFormat, targetFormat, model, body, stream, credentials, provider, reqLogger, stripList, connectionId, rtkEnabled);
+    translatedBody = translateRequest(sourceFormat, targetFormat, model, body, stream, credentials, provider, reqLogger, stripList, connectionId, rtkEnabled, clientTool);
     if (!translatedBody) {
       trackPendingRequest(model, provider, connectionId, false, true);
       return createErrorResult(HTTP_STATUS.BAD_REQUEST, `Failed to translate request for ${sourceFormat} → ${targetFormat}`);

open-sse/translator/helpers/geminiHelper.js

@@ -8,9 +8,9 @@ export const UNSUPPORTED_SCHEMA_CONSTRAINTS = [
   // Claude rejects these in VALIDATED mode
   "default", "examples",
   // JSON Schema meta keywords
-  "$schema", "$defs", "definitions", "const", "$ref",
+  "$schema", "$defs", "definitions", "const", "$ref", "$comment",
   // Object validation keywords (not supported)
-  "additionalProperties", "propertyNames", "patternProperties",
+  "additionalProperties", "propertyNames", "patternProperties", "enumDescriptions",
   // Complex schema keywords (handled by flattenAnyOfOneOf/mergeAllOf)
   "anyOf", "oneOf", "allOf", "not",
   // Dependency keywords (not supported)
@@ -111,16 +111,18 @@ function removeUnsupportedKeywords(obj, keywords) {
     for (const item of obj) {
       removeUnsupportedKeywords(item, keywords);
     }
-  } else {
+    return;
-    for (const key of Object.keys(obj)) {
+  }
-      if (keywords.includes(key) || key.startsWith("x-")) {
+
-        delete obj[key];
+  for (const key of Object.keys(obj)) {
-      }
+    if (keywords.includes(key) || key.startsWith("x-")) {
+      delete obj[key];
+      continue;
     }
-    for (const value of Object.values(obj)) {
+
-      if (value && typeof value === "object") {
+    const value = obj[key];
-        removeUnsupportedKeywords(value, keywords);
+    if (value && typeof value === "object") {
-      }
+      removeUnsupportedKeywords(value, keywords);
     }
   }
 }

open-sse/translator/index.js

@@ -71,7 +71,7 @@ function stripContentTypes(body, stripList = []) {
 }
 
 // Translate request: source -> openai -> target
-export function translateRequest(sourceFormat, targetFormat, model, body, stream = true, credentials = null, provider = null, reqLogger = null, stripList = [], connectionId = null, rtkEnabled = false) {
+export function translateRequest(sourceFormat, targetFormat, model, body, stream = true, credentials = null, provider = null, reqLogger = null, stripList = [], connectionId = null, rtkEnabled = false, clientTool = null) {
   ensureInitialized();
   let result = body;
 
@@ -140,14 +140,11 @@ export function translateRequest(sourceFormat, targetFormat, model, body, stream
     }
   }
 
-  // Antigravity cloaking: rename client tools + inject decoys (anti-ban)
+  // Antigravity cloaking/tool stripping is intentionally disabled for GitHub Copilot.
-  // Skip if client is native AG (userAgent = antigravity)
+  // Keep the translated request intact; final provider-specific sanitization happens
-  if (provider === FORMATS.ANTIGRAVITY && body.userAgent !== FORMATS.ANTIGRAVITY) {
+  // in the Antigravity executor.
-    const { cloakedBody, toolNameMap } = AntigravityExecutor.cloakTools(result);
+  if (provider === FORMATS.ANTIGRAVITY && clientTool === "github-copilot") {
-    result = cloakedBody;
+    // No-op
-    if (toolNameMap?.size > 0) {
-      result._toolNameMap = toolNameMap;
-    }
   }
 
   return result;

open-sse/translator/request/openai-to-gemini.js

@@ -336,6 +336,20 @@ function wrapInCloudCodeEnvelopeForClaude(model, claudeRequest, credentials = nu
     }
   };
 
+  // Build tool_use id -> name map so functionResponse can use the correct name
+  const toolUseIdToName = {};
+  if (claudeRequest.messages && Array.isArray(claudeRequest.messages)) {
+    for (const msg of claudeRequest.messages) {
+      if (Array.isArray(msg.content)) {
+        for (const block of msg.content) {
+          if (block.type === "tool_use" && block.id && block.name) {
+            toolUseIdToName[block.id] = block.name;
+          }
+        }
+      }
+    }
+  }
+
   // Convert Claude messages to Gemini contents
   if (claudeRequest.messages && Array.isArray(claudeRequest.messages)) {
     for (const msg of claudeRequest.messages) {
@@ -349,7 +363,7 @@ function wrapInCloudCodeEnvelopeForClaude(model, claudeRequest, credentials = nu
             parts.push({
               functionCall: {
                 id: block.id,
-                name: block.name,
+                name: sanitizeGeminiFunctionName(block.name),
                 args: block.input || {}
               }
             });
@@ -358,10 +372,14 @@ function wrapInCloudCodeEnvelopeForClaude(model, claudeRequest, credentials = nu
             if (Array.isArray(content)) {
               content = content.map(c => c.type === "text" ? c.text : JSON.stringify(c)).join("\n");
             }
+            // Resolve the original tool name from the id — Gemini requires it to match the functionCall name
+            const resolvedName = toolUseIdToName[block.tool_use_id]
+              ? sanitizeGeminiFunctionName(toolUseIdToName[block.tool_use_id])
+              : "tool";
             parts.push({
               functionResponse: {
                 id: block.tool_use_id,
-                name: "unknown",
+                name: resolvedName,
                 response: { result: tryParseJSON(content) || content }
               }
             });

open-sse/utils/clientDetector.js

@@ -20,10 +20,17 @@ const NATIVE_PAIRS = {
 export function detectClientTool(headers = {}, body = {}) {
   const ua = (headers["user-agent"] || "").toLowerCase();
   const xApp = (headers["x-app"] || "").toLowerCase();
+  const openaiIntent = (headers["openai-intent"] || "").toLowerCase();
+  const initiator = (headers["x-initiator"] || headers["X-Initiator"] || "").toLowerCase();
 
   // Antigravity: detected via body field (not header)
   if (body.userAgent === "antigravity") return "antigravity";
 
+  // GitHub Copilot / OAI compatible extension using Copilot chat headers
+  if (ua.includes("githubcopilotchat") || openaiIntent === "conversation-panel" || initiator === "user") {
+    return "github-copilot";
+  }
+
   // Claude Code / Claude CLI
   if (ua.includes("claude-cli") || ua.includes("claude-code") || xApp === "cli") return "claude";