What is an MCP Live Inspector?

An MCP Live Inspector analyzes server snippets to verify tool discoverability, input schema quality, and JSON-RPC contract hygiene before agents consume your tools.

Why does MCP debugging feel hard?

Most failures happen at metadata boundaries (descriptions, schemas, tool registration, RPC envelope handling), not business logic. Inspecting these layers early prevents invisible agent failures.

Can this replace runtime integration testing?

No. It complements runtime tests by catching common protocol and schema issues quickly, then you still run end-to-end agent simulations in your environment.

MCP Live Inspector & Server Blueprint

Validate what an AI agent can actually see in your MCP server code, catch schema/description gaps, and harden JSON-RPC contracts.

MCP Live Inspector

Validate tool discovery, schema coverage, and JSON-RPC readiness.

Strict description checks

Warn when tool descriptions are weak or missing.

MCP server code

Inspector report

What this MCP inspector checks

This validator focuses on high-impact reliability checks: whether tools are discoverable by agents, whether input contracts are explicit, whether descriptions are usable for model reasoning, and whether JSON-RPC envelopes are consistent.

Missing or weak tool descriptions that reduce agent selection quality
Missing input schemas that cause brittle tool calls
Potentially excessive output patterns that increase leakage risk
JSON-RPC envelope hints for deterministic request/response handling

Use cases for teams shipping MCP tools

Use it during local development, pull request review, and pre-release QA to avoid protocol-level regressions before your tools are consumed by production agents.

MCP inspector FAQ

Related tools: JSON to Zod, GEO Citation Analyzer, and Log Anonymizer.

Last updated: February 24, 2026