mcpbeat Sign in

Witness MCP Server

answering

Witness is answering right now. Last checked 5 min ago. It exposes 1 tools.

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

Uptime history 25 days of history · worst day 99%
25 days agonow
100.0%
Uptime 24h
184 of 184 checks
1
Tools
read from the server
347 ms
Response time
average over 24h
open, no key
Access
streamable-http

Witness missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

run in your terminal
claude mcp add witness --transport http https://witness-edge-phase-c-test.witness-test.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "witness": {
      "url": "https://witness-edge-phase-c-test.witness-test.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.witness]
url = "https://witness-edge-phase-c-test.witness-test.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "witness": {
      "url": "https://witness-edge-phase-c-test.witness-test.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "witness": {
      "url": "https://witness-edge-phase-c-test.witness-test.workers.dev/mcp"
    }
  }
}

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

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

Endpoints

URLTransportStateLatencyChecked
https://witness-edge-phase-c-test.witness-test.workers.dev/mcp streamable-http answering 206 ms 5 min ago
https://witness-contractwitness-production.witness-test.workers.dev/mcp streamable-http answering 413 ms 5 min ago

Alternatives to Witness

same job, measured the same way
Fixzi — MCP & API Schema Drift Monitor
by rohitcodilya

Monitor MCP servers, API contracts and AI outputs for schema drift. Alerts on breaking changes.

answering
Vdiff MCP
by mcurmi05

Breaking-change diffs for npm packages: removed exports, changed signatures, migration notes.

41 installs/wk local only
Deprecation MCP
by tsvillain

MCP server for cross-vendor API/SDK deprecation and breaking-change tracking

39 installs/wk local only
Lingua Universale MCP Server
by rafapra3008

Verify AI agent communication with session types and formal proofs

69 installs/wk local only
SHAR Production Metadata MCP
by sharproduction

Read-only validation of rights-aware production metadata manifests for MCP-compatible clients.

local only
I
Viberaven
by ohad6k

VibeRaven MCP for production-readiness checks and Launch Autopilot next actions

89 installs/wk local only
Landing
by ryudi84

MCP server for generating production-ready HTML landing pages.

28 installs/wk local only
Queue Pilot
by larscowe

MCP server for RabbitMQ and Kafka message inspection with JSON Schema validation

38 installs/wk local only

Witness — questions

Answers built from our own checks of this server.

What can Witness do?
It exposes 1 tools, read directly from the server on our last check. Among them: contract_witness. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Witness working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 184 of 184 checks got a reply (100.0%), average response time 347 ms. The bar chart above shows every period we have measured.
How do I connect Witness?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Witness need an API key?
No. Witness completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Witness?
It answers our handshake in 347 ms on average, which is faster than 45% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.