diff --git a/netlify/functions/agent-proxy.js b/netlify/functions/agent-proxy.js
index 25a2c32..0a51b6e 100644
--- a/netlify/functions/agent-proxy.js
+++ b/netlify/functions/agent-proxy.js
@@ -12,11 +12,9 @@ import Anthropic from '@anthropic-ai/sdk'
 // ---------------------------------------------------------------------------
 // Managed Agent configuration
 // ---------------------------------------------------------------------------
-// If you have provisioned a Managed Agent in the Anthropic console, set its
-// ID here (or via the AGENT_ID env var). When AGENT_ID is present the call
-// is routed to that agent. Otherwise we fall back to a system-prompt-driven
-// "virtual agent" that defines the persona inline.
-const AGENT_ID = process.env.ANTHROPIC_AGENT_ID || 'YOUR_AGENT_ID_HERE'
+// The Managed Agent ID is supplied via the ANTHROPIC_AGENT_ID env var. When
+// present the call is routed to that agent. Otherwise we fall back to a
+// system-prompt-driven "virtual agent" that defines the persona inline.
 
 const SYSTEM_PROMPT = `You are the "PMC Funder Discovery Agent", an expert
 fundraising consultant for U.S. public media stations (NPR/PBS member
@@ -38,11 +36,6 @@ specific dollar amounts.`
 
 const MODEL = process.env.ANTHROPIC_MODEL || 'claude-sonnet-4-5'
 
-// 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_011CawyAEnxwp1oXg79g2Fjx'
-
 // ---------------------------------------------------------------------------
 // Anthropic client (reused across warm Lambda invocations)
 // ---------------------------------------------------------------------------
@@ -54,8 +47,6 @@ function getClient() {
   }
   _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' },
   })
   return _client
 }
@@ -122,23 +113,12 @@ Please draft the funding outlook brief described in your instructions.`
     messages: [
       {
         role: 'user',
-        content: [
-          {
-            type: 'document',
-            source: { type: 'file', file_id: KNOWLEDGE_FILE_ID },
-            title: 'Funder knowledge base (CSV)',
-            citations: { enabled: true },
-            // Cache the tokenized CSV on Anthropic's side for ~5 minutes
-            // so repeat requests pay ~10% of input-token cost for it.
-            cache_control: { type: 'ephemeral' },
-          },
-          { type: 'text', text: userMessage },
-        ],
+        content: [{ type: 'text', text: userMessage }],
       },
     ],
   }
-  if (AGENT_ID && AGENT_ID !== 'YOUR_AGENT_ID_HERE') {
-    streamArgs.agent_id = AGENT_ID
+  if (process.env.ANTHROPIC_AGENT_ID) {
+    streamArgs.agent_id = process.env.ANTHROPIC_AGENT_ID
   }
 
   const upstream = client.messages.stream(streamArgs)