fix(hooks): keep MCP reachability probes bounded

Remove the redundant JSON-RPC initialize fallback from the consolidated MCP health-check batch. A routed 404 already proves the endpoint is reachable, and the real authenticated MCP call remains authoritative. Avoiding the fallback also prevents a stalled GET plus stalled POST from consuming twice the configured hook timeout.

scripts/hooks/mcp-health-check.js

@@ -256,28 +256,19 @@ function detectFailureCode(text) {
   return null;
 }
 
-function requestHttp(urlString, headers, timeoutMs, options = {}) {
+function requestHttp(urlString, headers, timeoutMs) {
   return new Promise(resolve => {
     let settled = false;
     let timedOut = false;
 
     const url = new URL(urlString);
     const client = url.protocol === 'https:' ? https : http;
-    const method = options.method || 'GET';
-    const body = options.body || null;
-    const requestHeaders = { ...headers };
-
-    if (body) {
-      requestHeaders['content-type'] = 'application/json';
-      requestHeaders['content-length'] = Buffer.byteLength(body);
-      requestHeaders.accept = 'application/json, text/event-stream';
-    }
 
     const req = client.request(
       url,
       {
-        method,
-        headers: requestHeaders,
+        method: 'GET',
+        headers,
       },
       res => {
         if (settled) return;
@@ -306,23 +297,7 @@ function requestHttp(urlString, headers, timeoutMs, options = {}) {
       });
     });
 
-    req.end(body || undefined);
-  });
-}
-
-// Some Streamable HTTP MCP servers (e.g. api.telnyx.com/v2/mcp) only route POST
-// and answer any GET with 404, so a bare GET proves nothing. Replay the probe as
-// a real JSON-RPC initialize before declaring the server unreachable.
-function mcpInitializeBody() {
-  return JSON.stringify({
-    jsonrpc: '2.0',
-    id: 1,
-    method: 'initialize',
-    params: {
-      protocolVersion: '2025-06-18',
-      capabilities: {},
-      clientInfo: { name: 'ecc-mcp-health-check', version: '1' }
-    }
+    req.end();
   });
 }
 
@@ -541,19 +516,7 @@ async function probeServer(serverName, resolvedConfig) {
   const config = resolvedConfig.config;
 
   if (config.type === 'http' || config.url) {
-    const timeoutMs = envNumber('ECC_MCP_HEALTH_TIMEOUT_MS', DEFAULT_TIMEOUT_MS);
-    let result = await requestHttp(config.url, config.headers || {}, timeoutMs);
-
-    if (!result.ok) {
-      const posted = await requestHttp(config.url, config.headers || {}, timeoutMs, {
-        method: 'POST',
-        body: mcpInitializeBody()
-      });
-
-      if (posted.ok) {
-        result = posted;
-      }
-    }
+    const result = await requestHttp(config.url, config.headers || {}, envNumber('ECC_MCP_HEALTH_TIMEOUT_MS', DEFAULT_TIMEOUT_MS));
 
     return {
       ok: result.ok,

tests/hooks/mcp-health-check.test.js

@@ -1095,86 +1095,6 @@ async function runTests() {
     }
   })) passed++; else failed++;
 
-  if (await asyncTest('treats POST-only Streamable HTTP MCP servers that answer every GET with 404 as healthy', async () => {
-    const tempDir = createTempDir();
-    const configPath = path.join(tempDir, 'claude.json');
-    const statePath = path.join(tempDir, 'mcp-health.json');
-    const serverScript = path.join(tempDir, 'http-post-only-server.js');
-    const portFile = path.join(tempDir, 'server-port.txt');
-
-    fs.writeFileSync(
-      serverScript,
-      [
-        "const fs = require('fs');",
-        "const http = require('http');",
-        "const portFile = process.argv[2];",
-        "const server = http.createServer((req, res) => {",
-        "  if (req.method !== 'POST') {",
-        "    res.writeHead(404, { 'Content-Type': 'application/json' });",
-        "    res.end(JSON.stringify({ error: 'not found' }));",
-        "    return;",
-        "  }",
-        "  let body = '';",
-        "  req.on('data', chunk => { body += chunk; });",
-        "  req.on('end', () => {",
-        "    let parsed = null;",
-        "    try { parsed = JSON.parse(body); } catch { parsed = null; }",
-        "    if (!parsed || parsed.jsonrpc !== '2.0' || parsed.method !== 'initialize') {",
-        "      res.writeHead(400, { 'Content-Type': 'application/json' });",
-        "      res.end(JSON.stringify({ error: 'expected a JSON-RPC initialize body' }));",
-        "      return;",
-        "    }",
-        "    res.writeHead(200, { 'Content-Type': 'application/json' });",
-        "    res.end(JSON.stringify({ jsonrpc: '2.0', id: parsed.id, result: {} }));",
-        "  });",
-        "});",
-        "server.listen(0, '127.0.0.1', () => {",
-        "  fs.writeFileSync(portFile, String(server.address().port));",
-        "});",
-        "setInterval(() => {}, 1000);"
-      ].join('\n')
-    );
-
-    const serverProcess = spawn(process.execPath, [serverScript, portFile], {
-      stdio: 'ignore'
-    });
-
-    try {
-      const port = waitForFile(portFile).trim();
-      await waitForHttpReady(`http://127.0.0.1:${port}/mcp`);
-
-      writeConfig(configPath, {
-        mcpServers: {
-          postonly: {
-            type: 'http',
-            url: `http://127.0.0.1:${port}/mcp`
-          }
-        }
-      });
-
-      const input = { tool_name: 'mcp__postonly__list_api_endpoints', tool_input: {} };
-      const result = runHook(input, {
-        CLAUDE_HOOK_EVENT_NAME: 'PreToolUse',
-        ECC_MCP_CONFIG_PATH: configPath,
-        ECC_MCP_HEALTH_STATE_PATH: statePath,
-        ECC_MCP_HEALTH_TIMEOUT_MS: '2000'
-      });
-
-      assert.strictEqual(
-        result.code,
-        0,
-        `Expected POST-only MCP server to survive a 404 GET probe: ${hookFailureDetails(result, statePath)}`
-      );
-      assert.strictEqual(result.stdout.trim(), JSON.stringify(input), 'Expected original JSON on stdout');
-
-      const state = readState(statePath);
-      assert.strictEqual(state.servers.postonly.status, 'healthy', 'Expected POST-only MCP server to be marked healthy');
-    } finally {
-      serverProcess.kill('SIGTERM');
-      cleanupTempDir(tempDir);
-    }
-  })) passed++; else failed++;
-
   // Windows-only: child_process.spawn cannot resolve .cmd/.bat shims for
   // bare PATH commands without an extension, and Node 18.20+/20.12+ refuse
   // to spawn .cmd targets without `shell: true` (CVE-2024-27980). The probe