MCP server

Witness

io.github.tfitzgerwitness/witness

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

1

Token cost

About 226 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http witness https://witness-contractwitness-production.witness-test.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.witness]
url = "https://witness-contractwitness-production.witness-test.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"witness":{"httpUrl":"https://witness-contractwitness-production.witness-test.workers.dev/mcp"}}}

Cursor

{"mcpServers":{"witness":{"url":"https://witness-contractwitness-production.witness-test.workers.dev/mcp"}}}

VS Code

{"servers":{"witness":{"type":"http","url":"https://witness-contractwitness-production.witness-test.workers.dev/mcp"}}}

Antigravity

agy mcp add witness https://witness-contractwitness-production.witness-test.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"witness","server_url":"https://witness-contractwitness-production.witness-test.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"witness","server_url":"https://witness-contractwitness-production.witness-test.workers.dev/mcp"}

Tools

• contract_witness ~226 tokens
  Produce a concrete independently revalidated JSON-Schema/MCP backward-compatibility witness before merge/deploy. UNKNOWN or NO_WITNESS_FOUND never means compatible.

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• GitHub tools
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