MCP-TUI

Verify an MCP tool in seconds. Connect to a server, pick a tool, fill the form mcp-tui builds from its input schema, run it, and copy the same call as a CLI command.

go install github.com/standardbeagle/mcp-tui@latest     # or: npm install -g @standardbeagle/mcp-tui
mcp-tui --url http://localhost:8080/mcp                 # TUI
mcp-tui --url http://localhost:8080/mcp tool list       # CLI

What it catches

Handshake and transport mistakes

A 404 path, SSE against a streamable endpoint, a stdio server logging to stdout, a server ignoring server/discover: each named with its fix. Fix connection errors

Bad arguments, before they are sent

Every call is checked against the tool’s whole input schema; the error names the argument and the rule. Validate arguments

Spec and security gaps

verify probes origin and DNS-rebinding protection, tool names and list order; conform runs the whole matrix with JUnit output. Check compliance

Every message on the wire

JSON-RPC in both directions, HTTP timings, the OAuth flow step by step, credentials masked. Inspect traffic

From a manual check to CI

Every TUI action has a CLI equivalent: c copies one call, Ctrl+E exports the session as a replay script. The CLI prints JSON for jq and exits non-zero on failures you choose.

From a manual run to a CI script. Every TUI action has a CLI equivalent: copy one call with c, export the whole session as a replay script with Ctrl+E, and gate CI on exit codes and JSON output.

Covers the protocol

MCP 2026-07-28 and earlier, over stdio, streamable HTTP and SSE: tools, resources and templates, prompts, completion, progress, server logs, tasks, subscriptions, elicitation, sampling, roots, and OAuth from client credentials to enterprise managed authorization.

Test OAuth

Progress, logs, tasks and subscriptions

Elicitation and sampling

Protocol versions

All videos

CLI reference