MCP MeasureMCP Measure

index observed

Witness

Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
70%
Naming quality
80%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~212Tokens (tool definitions)
~1.7 KBTypical response size
Minimal attention impact (0.17% 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": {
    "witness": {
      "url": "https://witness-edge-phase-c-test.witness-test.workers.dev/mcp"
    }
  }
}

Remote endpoints

https://witness-edge-phase-c-test.witness-test.workers.dev/mcpstreamable-http
https://witness-contractwitness-production.witness-test.workers.dev/mcpstreamable-http

What it can do

Tool inventory

Tools (1)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
⚪contract_witness(mode, old_schema, new_schema, options)

Produce a concrete independently revalidated JSON-Schema/MCP backward-compatibility witness before merge/deploy. UNKNOWN or NO_WITNESS_FOUND never means compatible.

Input Schema

{
  "type": "object",
  "properties": {
    "mode": {
      "type": "string",
      "enum": [
        "input_backward_compatibility",
        "output_backward_compatibility"
      ]
    },
    "old_schema": {
      "anyOf": [
        {
          "type": "boolean"
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ]
    },
    "new_schema": {
      "anyOf": [
        {
          "type": "boolean"
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ]
    },
    "options": {
      "type": "object",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    }
  },
  "required": [
    "mode",
    "old_schema",
    "new_schema"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Community

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Evidence

Recent observations

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