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Webhook Signature Fixture Lab

Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature...

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
94%
Naming quality
80%
Poisoning risk
100%
Permission match
90%
Protocol compliance
100%

Findings (1)

  • LOWTool 'webhook_signature_fixture_lab' suggests web access but openWorldHint=falsein webhook_signature_fixture_lab

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~325Tokens (tool definitions)
~2.8 KBTypical response size
Minimal attention impact (0.25% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "webhook-signature-fixture-lab": {
      "url": "https://mcp-factory.bowling-anthony.workers.dev/webhook-signature-fixture-lab/mcp"
    }
  }
}

Remote endpoints

https://mcp-factory.bowling-anthony.workers.dev/webhook-signature-fixture-lab/mcpstreamable-http

What it can do

Tool inventory

Tools (1)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢webhook_signature_fixture_lab(mode, test_secret, payload, timestamp, now, ...)

Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature using a customer-owned TEST secret and payload. It is offline and never delivers HTTP requests or validates a live endpoint. Price: 0.03 USDC per completed bounded job on Base.

Input Schema

{
  "type": "object",
  "properties": {
    "mode": {
      "type": "string",
      "enum": [
        "github_sha256",
        "timestamped_sha256"
      ]
    },
    "test_secret": {
      "type": "string",
      "minLength": 1,
      "maxLength": 1024,
      "description": "Customer-owned TEST secret; never returned in output."
    },
    "payload": {
      "type": "string",
      "description": "Exact UTF-8 payload text, at most 65536 bytes; never parsed or reformatted."
    },
    "timestamp": {
      "type": "string",
      "pattern": "^[1-9][0-9]{0,11}$",
      "description": "Required by timestamped_sha256: canonical positive epoch seconds."
    },
    "now": {
      "type": "string",
      "pattern": "^[1-9][0-9]{0,11}$",
      "description": "Required by timestamped_sha256: supplied comparison epoch seconds."
    },
    "tolerance_seconds": {
      "type": "integer",
      "minimum": 0,
      "maximum": 3600,
      "default": 300
    },
    "supplied_signature": {
      "type": "string",
      "maxLength": 256,
      "description": "Optional exact header value to verify; malformed values produce a negative verification result."
    }
  },
  "required": [
    "mode",
    "test_secret",
    "payload"
  ],
  "additionalProperties": false
}

Community

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Evidence

Recent observations

verifiedversion not recorded1 tools
verifiedversion not recorded1 tools
verifiedversion not recorded1 tools