MCP server

First-Call Witness

com.textforagents/first-call-latency-witness

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

At a glance

Type

MCP server

Publisher

textforagents.com (verified by the MCP Registry)

Status

Working at last check

Tools

3

Token cost

About 150 tokens per request

Sets up in

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

Last checked

28 Oct 2026, 09:03 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 first-call-latency-witness https://textforagents.com/products/first-call-latency-witness/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.first-call-latency-witness]
url = "https://textforagents.com/products/first-call-latency-witness/mcp"

Gemini CLI

{"mcpServers":{"first-call-latency-witness":{"httpUrl":"https://textforagents.com/products/first-call-latency-witness/mcp"}}}

Cursor

{"mcpServers":{"first-call-latency-witness":{"url":"https://textforagents.com/products/first-call-latency-witness/mcp"}}}

VS Code

{"servers":{"first-call-latency-witness":{"type":"http","url":"https://textforagents.com/products/first-call-latency-witness/mcp"}}}

Antigravity

agy mcp add first-call-latency-witness https://textforagents.com/products/first-call-latency-witness/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":"first-call-latency-witness","server_url":"https://textforagents.com/products/first-call-latency-witness/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"first-call-latency-witness","server_url":"https://textforagents.com/products/first-call-latency-witness/mcp"}

Tools

• budgets ~33 tokens
  Get the versioned budget table
• verify_receipt ~50 tokens
  Verify a signed receipt envelope
• witness_check ~67 tokens
  Witness check — paid work is refused over MCP; payments collect on the HTTP x402 surface (POST /check)

Browse

• Payments

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Badge for your README

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