MCP MeasureMCP Measure

index observed

First-Call Witness

Real MCP handshake witness graded per-client, signed expiring receipt.

Should I use this

Quality & Safety

B
Description quality
87%
Schema completeness
63%
Naming quality
87%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~132Tokens (tool definitions)
~191 BTypical response size
Minimal attention impact (0.10% 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": {
    "first-call-latency-witness": {
      "url": "https://textforagents.com/products/first-call-latency-witness/mcp"
    }
  }
}

Remote endpoints

https://textforagents.com/products/first-call-latency-witness/mcpstreamable-http

What it can do

Tool inventory

Tools (3)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢budgets

Get the versioned budget table

Input Schema

{
  "type": "object",
  "properties": {}
}
🟢witness_check(url)

Witness check — paid work is refused over MCP; payments collect on the HTTP x402 surface (POST /check)

Input Schema

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string"
    }
  },
  "required": [
    "url"
  ]
}
⚪verify_receipt(receipt)

Verify a signed receipt envelope

Input Schema

{
  "type": "object",
  "properties": {
    "receipt": {
      "type": "object"
    }
  },
  "required": [
    "receipt"
  ]
}

Community

Rate this Server

Evidence

Recent observations

verifiedversion not recorded3 tools