diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2250b2135ff..c2b7ff16c54 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Agents/schema cleaning: detect Venice + Grok model IDs as xAI-proxied targets so unsupported JSON Schema keywords are stripped before requests, preventing Venice/Grok `Invalid arguments` failures. (openclaw#35355) thanks @Sid-Qin.
 - Skills/native command deduplication: centralize skill command dedupe by canonical `skillName` in `listSkillCommandsForAgents` so duplicate suffixed variants (for example `_2`) are no longer surfaced across interfaces outside Discord. (#27521) thanks @shivama205.
 - Feishu/streaming card delivery synthesis: unify snapshot and delta streaming merge semantics, apply overlap-aware final merge, suppress duplicate final text delivery (including text+media final packets), prefer topic-thread `message.reply` routing when a reply target exists, and tune card print cadence to avoid duplicate incremental rendering. (from #33245, #32896, #33840) Thanks @rexl2018, @kcinzgg, and @aerelune.
 - Security/dependency audit: patch transitive Hono vulnerabilities by pinning `hono` to `4.12.5` and `@hono/node-server` to `1.19.10` in production resolution paths. Thanks @shakkernerd.
diff --git a/src/agents/schema/clean-for-xai.test.ts b/src/agents/schema/clean-for-xai.test.ts
index a48cc99fbc2..6f9c316c784 100644
--- a/src/agents/schema/clean-for-xai.test.ts
+++ b/src/agents/schema/clean-for-xai.test.ts
@@ -29,6 +29,18 @@ describe("isXaiProvider", () => {
   it("handles undefined provider", () => {
     expect(isXaiProvider(undefined)).toBe(false);
   });
+
+  it("matches venice provider with grok model id", () => {
+    expect(isXaiProvider("venice", "grok-4.1-fast")).toBe(true);
+  });
+
+  it("matches venice provider with venice/ prefixed grok model id", () => {
+    expect(isXaiProvider("venice", "venice/grok-4.1-fast")).toBe(true);
+  });
+
+  it("does not match venice provider with non-grok model id", () => {
+    expect(isXaiProvider("venice", "llama-3.3-70b")).toBe(false);
+  });
 });
 
 describe("stripXaiUnsupportedKeywords", () => {
diff --git a/src/agents/schema/clean-for-xai.ts b/src/agents/schema/clean-for-xai.ts
index b18b5746371..f11f82629da 100644
--- a/src/agents/schema/clean-for-xai.ts
+++ b/src/agents/schema/clean-for-xai.ts
@@ -48,8 +48,13 @@ export function isXaiProvider(modelProvider?: string, modelId?: string): boolean
   if (provider.includes("xai") || provider.includes("x-ai")) {
     return true;
   }
+  const lowerModelId = modelId?.toLowerCase() ?? "";
   // OpenRouter proxies to xAI when the model id starts with "x-ai/"
-  if (provider === "openrouter" && modelId?.toLowerCase().startsWith("x-ai/")) {
+  if (provider === "openrouter" && lowerModelId.startsWith("x-ai/")) {
+    return true;
+  }
+  // Venice proxies to xAI/Grok models
+  if (provider === "venice" && lowerModelId.includes("grok")) {
     return true;
   }
   return false;