From c8ca68f13bec93d2ae5103509cd45db511b9b6f1 Mon Sep 17 00:00:00 2001
From: Alex Curley <alex@semipublic.co>
Date: Mon, 11 May 2026 23:07:30 -0400
Subject: [PATCH] Invoke file ID

---
 netlify/functions/agent-proxy.js | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/netlify/functions/agent-proxy.js b/netlify/functions/agent-proxy.js
index 43a0a4a..1566392 100644
--- a/netlify/functions/agent-proxy.js
+++ b/netlify/functions/agent-proxy.js
@@ -72,7 +72,17 @@ export default async (req /*, context */) => {
     return new Response('Server is missing ANTHROPIC_API_KEY', { status: 500 })
   }
 
-  const client = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY })
+  const client = new Anthropic({
+    apiKey: process.env.ANTHROPIC_API_KEY,
+    // Required while the Files API is in beta.
+    defaultHeaders: { 'anthropic-beta': 'files-api-2025-04-14' },
+  })
+
+  // File uploaded to the Anthropic Console / Files API that the agent
+  // should consult on every call.
+  const KNOWLEDGE_FILE_ID =
+    process.env.ANTHROPIC_KNOWLEDGE_FILE_ID ||
+    'file_011Cawv1SPNaknuMmyDtM1S7'
 
   const userMessage = `Here is a new public media station intake:
 
@@ -93,7 +103,20 @@ Please draft the funding outlook brief described in your instructions.`
     model: MODEL,
     max_tokens: 10000,
     system: SYSTEM_PROMPT,
-    messages: [{ role: 'user', content: userMessage }],
+    messages: [
+      {
+        role: 'user',
+        content: [
+          {
+            type: 'document',
+            source: { type: 'file', file_id: KNOWLEDGE_FILE_ID },
+            // Lets the model cite the doc in answers.
+            citations: { enabled: true },
+          },
+          { type: 'text', text: userMessage },
+        ],
+      },
+    ],
   }
   if (AGENT_ID && AGENT_ID !== 'YOUR_AGENT_ID_HERE') {
     streamArgs.agent_id = AGENT_ID