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This guide covers how to test your Signal Collection integration and troubleshoot common issues.

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Manual Testing with cURL

You can test the MCP Signal Server directly using cURL. The server uses the MCP JSON-RPC protocol.

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Test Authentication

Verify your API key is valid: 
curl -X POST https://zeroclick.dev/mcp/v2 \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "x-zc-api-key: YOUR_API_KEY" \
  -H "x-zc-llm-model: openai/gpt-4o" \
  -d '{
    "jsonrpc": "2.0",
    "method": "initialize",
    "params": {
      "protocolVersion": "2024-11-05",
      "capabilities": {},
      "clientInfo": {
        "name": "test-client",
        "version": "1.0.0"
      }
    },
    "id": 1
  }'
Expected response: Server capabilities and protocol version. Error response (invalid key): 
{
  "error": "Unauthorized"
}

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List Available Tools

curl -X POST https://zeroclick.dev/mcp/v2 \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "x-zc-api-key: YOUR_API_KEY" \
  -H "x-zc-llm-model: openai/gpt-4o" \
  -d '{
    "jsonrpc": "2.0",
    "method": "tools/list",
    "params": {},
    "id": 2
  }'
Expected response: List of available tools including broadcast_signal.

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Send a Test Signal

curl -X POST https://zeroclick.dev/mcp/v2 \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "x-zc-api-key: YOUR_API_KEY" \
  -H "x-zc-llm-model: openai/gpt-4o" \
  -H "x-zc-user-id: test-user-123" \
  -H "x-zc-user-session-id: test-session-456" \
  -H "x-zc-user-locale: en-US" \
  -H "x-zc-grouping-id: test-campaign" \
  -d '{
    "jsonrpc": "2.0",
    "method": "tools/call",
    "params": {
      "name": "broadcast_signal",
      "arguments": {
        "signals": [{
          "category": "interest",
          "confidence": 0.85,
          "subject": "test signal",
          "sentiment": "positive"
        }]
      }
    },
    "id": 3
  }'
Expected response: 
{
  "content": [
    {
      "type": "text",
      "text": "Signals broadcasted successfully"
    }
  ],
  "structuredContent": {
    "success": true
  }
}

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SDK Testing

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TypeScript Test Script

import { Client } from "@modelcontextprotocol/sdk/client/index.js";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";

async function testConnection() {
  const transport = new StreamableHTTPClientTransport(
    new URL("https://zeroclick.dev/mcp/v2"),
    {
      requestInit: {
        headers: {
          "x-zc-api-key": process.env.ZEROCLICK_API_KEY!
        }
      }
    }
  );

  const client = new Client({
    name: "test-client",
    version: "1.0.0"
  });

  try {
    // Test connection
    await client.connect(transport);
    console.log("Connected successfully");

    // List tools
    const { tools } = await client.listTools();
    console.log("Available tools:", tools.map(t => t.name));

    // Send test signal
    const result = await client.callTool({
      name: "broadcast_signal",
      arguments: {
        signals: [{
          category: "interest",
          confidence: 0.85,
          subject: "test signal"
        }]
      }
    });
    console.log("Signal result:", result);

    await client.close();
    console.log("Test completed successfully");
  } catch (error) {
    console.error("Test failed:", error);
    process.exit(1);
  }
}

testConnection();
Run the test: 
ZEROCLICK_API_KEY=your-key npx tsx test-connection.ts

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Common Issues

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401 Unauthorized

Cause: Invalid or missing API key. Solution:
  • Verify your API key is correct
  • Ensure the header is x-zc-api-key (not x-tenant-api-key)
  • Check for extra whitespace in the key

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Connection Timeout

Cause: Network issues or firewall blocking. Solution:
  • Verify you can reach zeroclick.dev
  • Check if your network allows HTTPS connections
  • Try from a different network

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Invalid Signal Schema

Cause: Signal data doesn’t match expected format. Example error: 
{
  "error": {
    "code": -32602,
    "message": "Invalid params: confidence must be between 0 and 1"
  }
}
Solution:
  • Ensure confidence is a number between 0.0 and 1.0
  • Ensure category is one of the valid categories
  • Ensure subject is a non-empty string under 500 characters
  • Ensure signals array has 1-10 items

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Tool Not Found

Cause: Calling a tool that doesn’t exist. Solution: Use tools/list to see available tools. Signal Collection only exposes broadcast_signal.

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Debugging Tips

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Enable SDK Logging

const client = new Client({
  name: "your-agent",
  version: "1.0.0"
}, {
  // Enable debug logging
  logger: console
});

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Log All Headers

Verify your headers are being sent correctly: 
const headers = {
  "x-zc-api-key": process.env.ZEROCLICK_API_KEY,
  "x-zc-user-id": userId,
  "x-zc-user-session-id": sessionId,
  "x-zc-user-locale": userLocale,
  "x-zc-grouping-id": groupingId
};

// Log headers (redact API key in production)
console.log("Request headers:", {
  ...headers,
  "x-zc-api-key": headers["x-zc-api-key"] ? "[REDACTED]" : "MISSING"
});

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Validate Signal Before Sending

function validateSignal(signal: unknown): boolean {
  if (typeof signal !== "object" || signal === null) return false;

  const s = signal as Record<string, unknown>;

  // Required fields
  if (typeof s.category !== "string") return false;
  if (typeof s.confidence !== "number" || s.confidence < 0 || s.confidence > 1) return false;
  if (typeof s.subject !== "string" || s.subject.length === 0 || s.subject.length > 500) return false;

  // Valid categories
  const validCategories = [
    "interest", "evaluation", "problem", "purchase_intent",
    "price_sensitivity", "brand_affinity", "user_context",
    "business_context", "recommendation_request"
  ];
  if (!validCategories.includes(s.category)) return false;

  return true;
}

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Verifying Signals Were Received

Contact your ZeroClick integration specialist to verify signals are being received correctly.