diff --git a/apps/web/src/lib/ai-agent/tool-executor-agent.ts b/apps/web/src/lib/ai-agent/tool-executor-agent.ts
index a08ffaa..83cad96 100644
--- a/apps/web/src/lib/ai-agent/tool-executor-agent.ts
+++ b/apps/web/src/lib/ai-agent/tool-executor-agent.ts
@@ -159,6 +159,15 @@ export function calculateTokenBreakdown(
   };
 }
 
+/**
+ * Sanitize npm package name to valid OpenAI tool name
+ * OpenAI tool names must match: ^[a-zA-Z0-9_-]+
+ * Converts: @tpmjs/createblogpost -> tpmjs-createblogpost
+ */
+function sanitizeToolName(npmPackageName: string): string {
+  return npmPackageName.replace(/[@/]/g, '-').replace(/^-+/, '');
+}
+
 /**
  * Execute tool with AI agent and streaming
  */
@@ -169,6 +178,7 @@ export async function executeToolWithAgent(
   onTokenUpdate?: (tokens: Partial<TokenBreakdown>) => void
 ) {
   const toolDef = createToolDefinition(tool);
+  const sanitizedToolName = sanitizeToolName(tool.npmPackageName);
   const messages: CoreMessage[] = [
     {
       role: 'user',
@@ -183,7 +193,7 @@ export async function executeToolWithAgent(
     model: openai('gpt-4-turbo'),
     messages,
     tools: {
-      [tool.npmPackageName]: toolDef,
+      [sanitizedToolName]: toolDef,
     },
     // biome-ignore lint/suspicious/noExplicitAny: AI SDK v5 chunk type compatibility
     onChunk: ({ chunk }: { chunk: any }) => {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 9f0f744..d0e13d1 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -101,9 +101,6 @@ importers:
       remark-gfm:
         specifier: ^4.0.1
         version: 4.0.1
-      tiktoken:
-        specifier: ^1.0.22
-        version: 1.0.22
       zod:
         specifier: ^3.25.76
         version: 3.25.76
@@ -4627,9 +4624,6 @@ packages:
   thenify@3.3.1:
     resolution: {integrity: sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==}
 
-  tiktoken@1.0.22:
-    resolution: {integrity: sha512-PKvy1rVF1RibfF3JlXBSP0Jrcw2uq3yXdgcEXtKTYn3QJ/cBRBHDnrJ5jHky+MENZ6DIPwNUGWpkVx+7joCpNA==}
-
   tiny-invariant@1.3.3:
     resolution: {integrity: sha512-+FbBPE1o9QAYvviau/qC5SE3caw21q3xkvWKBtja5vgqOWIHHJ3ioaq1VPfn/Szqctz2bU/oYeKd9/z5BL+PVg==}
 
@@ -9920,8 +9914,6 @@ snapshots:
     dependencies:
       any-promise: 1.3.0
 
-  tiktoken@1.0.22: {}
-
   tiny-invariant@1.3.3: {}
 
   tinybench@2.9.0: {}