Add readOnlyHint and openWorldHint annotations to all MCP tools

This fixes ChatGPT's "MCP write action is temporarily disabled" error by explicitly marking all tools as read-only operations. ChatGPT's Developer Mode was misinterpreting the tools as write actions without these annotations.

Changes:
- Added annotations to all 5 tools in both index.js and server-http.js
- All tools now have: annotations: { readOnlyHint: true, openWorldHint: true }
- Added test-annotations.js to verify annotations are correctly returned

Tools updated:
- search_episodes
- get_episode
- search_transcripts
- get_host_info
- get_series_info

🤖 Generated with Claude Code

test-annotations.js

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+
+/**
+ * Quick test to verify tool annotations are present
+ */
+
+import EventSource from 'eventsource';
+import fetch from 'node-fetch';
+
+const SERVER_URL = 'http://localhost:3000';
+const SSE_ENDPOINT = `${SERVER_URL}/sse`;
+const MESSAGE_ENDPOINT = `${SERVER_URL}/message`;
+
+let requestId = 1;
+let sse;
+let connectionId = null;
+
+async function testAnnotations() {
+  console.log('Testing tool annotations...\n');
+
+  // Connect to SSE
+  sse = new EventSource(SSE_ENDPOINT);
+
+  await new Promise((resolve) => {
+    sse.addEventListener('endpoint', (event) => {
+      const url = new URL(event.data, SERVER_URL);
+      connectionId = url.searchParams.get('sessionId');
+      console.log(`Connected with session ID: ${connectionId}\n`);
+      resolve();
+    });
+  });
+
+  // Wait a moment for connection to stabilize
+  await new Promise(resolve => setTimeout(resolve, 500));
+
+  // Send tools/list request
+  const message = {
+    jsonrpc: '2.0',
+    id: requestId++,
+    method: 'tools/list',
+    params: {}
+  };
+
+  const messagePromise = new Promise((resolve) => {
+    sse.onmessage = (event) => {
+      try {
+        const data = JSON.parse(event.data);
+        if (data.result && data.result.tools) {
+          resolve(data.result.tools);
+        }
+      } catch (e) {
+        // Ignore
+      }
+    };
+  });
+
+  await fetch(MESSAGE_ENDPOINT, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'x-connection-id': connectionId
+    },
+    body: JSON.stringify(message)
+  });
+
+  const tools = await messagePromise;
+
+  console.log('Tool annotations check:\n');
+  tools.forEach(tool => {
+    const hasAnnotations = tool.annotations &&
+                          tool.annotations.readOnlyHint === true &&
+                          tool.annotations.openWorldHint === true;
+    const status = hasAnnotations ? '✅' : '❌';
+    console.log(`${status} ${tool.name}: annotations = ${JSON.stringify(tool.annotations || 'MISSING')}`);
+  });
+
+  sse.close();
+  process.exit(0);
+}
+
+testAnnotations().catch(err => {
+  console.error('Error:', err);
+  process.exit(1);
+});