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Request Replay & Clock Skew Correction for Distributed Systems

Parse a raw HTTP request or curl command, estimate client↔server clock skew from the response Date header (NTP-style midpoint formula), inspect timestamp credentials (X-Amz-Date, x-ms-date, X-Timestamp, JWT iat/nbf), replay with ±skew offsets and diff the results against real tolerance windows (AWS SigV4 ±15 min, Azure, OAuth, JWT leeway).

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Quick start

Call this tool from your code in three languages.

cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/request-replay-clock-skew-correction-distributed-systems' \
  -H 'Content-Type: application/json' \
  -d '{"rawRequest":"POST /v1/orders HTTP/1.1\nHost: api.example.com\nX-Amz-Date: 20260101T000000Z\nAuthorization: AWS4-HMAC-SHA256 Credential=AKIA.../20260101/us-east-1/execute-api/aws4_request, SignedHeaders=host;x-amz-date, Signature=abc123\nContent-Type: application/json\n\n{\"sku\": \"A-1\", \"qty\": 2}","mode":"analyze","capturedServerDate":"Thu, 01 Jan 2026 00:16:00 GMT","capturedReceivedAt":"Thu, 01 Jan 2026 00:00:10 GMT","offsets":"e.g. -950,0 or leave empty for the auto ±skew sweep","timeoutMs":10000}'

© 2026 Elysia Tools. Developer documentation.

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API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP
POST https://api.elysiatools.com/en/api/tools/request-replay-clock-skew-correction-distributed-systems

Parameters

NameTypeRequiredDescription
rawRequesttextareaYes—
modeselectYes—
capturedServerDatetextNo—
capturedReceivedAttextNo—
offsetstextNo—
timeoutMsnumberNo—

Response format

HTML result

JSON
{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json
{
  "mcpServers": {
    "elysiatools-request-replay-clock-skew-correction-distributed-systems": {
      "name": "request-replay-clock-skew-correction-distributed-systems",
      "description": "Parse a raw HTTP request or curl command, estimate client↔server clock skew from the response Date header (NTP-style midpoint formula), inspect timestamp credentials (X-Amz-Date, x-ms-date, X-Timestamp, JWT iat/nbf), replay with ±skew offsets and diff the results against real tolerance windows (AWS SigV4 ±15 min, Azure, OAuth, JWT leeway).",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=request-replay-clock-skew-correction-distributed-systems",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "request-replay-clock-skew-correction-distributed-systems",
    "arguments": {
  "rawRequest": "POST /v1/orders HTTP/1.1\nHost: api.example.com\nX-Amz-Date: 20260101T000000Z\nAuthorization: AWS4-HMAC-SHA256 Credential=AKIA.../20260101/us-east-1/execute-api/aws4_request, SignedHeaders=host;x-amz-date, Signature=abc123\nContent-Type: application/json\n\n{\"sku\": \"A-1\", \"qty\": 2}",
  "mode": "analyze",
  "capturedServerDate": "Thu, 01 Jan 2026 00:16:00 GMT",
  "capturedReceivedAt": "Thu, 01 Jan 2026 00:00:10 GMT",
  "offsets": "e.g. -950,0 or leave empty for the auto ±skew sweep",
  "timeoutMs": 10000
}
  }
}
Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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