MCP Inspector
Current Spec Verified Confidence: High (0.90)MCP Inspector is an MCP client published by Model Context Protocol project with verified support for the current MCP specification revision (2026-07-28). Last verified 2026-08-14.
Does MCP Inspector support the current MCP specification (2026-07-28)?
Yes. MCP Inspector has verified support for MCP revision 2026-07-28, the current stable specification (last verified 2026-08-14).
Which MCP client features does MCP Inspector support?
MCP Inspector supports: tools, resources, prompts, elicitation (last verified 2026-08-14).
Does MCP Inspector support MCP revision 2026-07-28?
Yes. MCP Inspector supports MCP revision 2026-07-28 (checked 2026-08-14).
When were MCP Inspector's facts last verified?
2026-08-14. Each fact on this page links to the sources used to verify it.
The MCP Inspector is the protocol project's own reference client for inspecting MCP servers, published from the modelcontextprotocol GitHub organization as a single npm package with three frontends: a web UI, a CLI, and a TUI. It exercises servers' tools, resources, and prompts, and handles both protocol eras: legacy handshake servers and the modern 2026-07-28 era, whose MRTR flow replaces the removed server-to-client elicitation requests.
Current-revision support is documented on the project's own surfaces: the README describes serving the "modern (2026-07-28) protocol era", release 2.1.0 shipped SEP-2243 header mirroring, and release 2.2.0 (2026-08-12) moved the tool onto the stable TypeScript SDK 2.0.0 and forwards the negotiated Mcp-Protocol-Version through its remote proxy. The v2 line is the active one; v1 receives security fixes only.
Which MCP spec revisions does MCP Inspector support?
| Spec revision | Status | Last checked | Evidence |
|---|---|---|---|
| MCP 2026-07-28 | Supported | Source |
How was this verified, and what are the sources?
Verified · method: repo-readme
· confidence 0.90 (High).
- Inspector README - "A developer tool for inspecting Model Context Protocol (MCP) servers", one @modelcontextprotocol/inspector package with web UI, CLI, and TUI modes; documents serving the "modern (2026-07-28) protocol era" via the SDK's createMcpHandler, and notes the legacy elicitation preset "errors on the 2026-07-28 leg - server to client requests aren't allowed there. MRTR is the modern replacement"; v2 line is active, v1 line is security-fixes only - accessed
- Inspector 2.2.0 release notes (2026-08-12) - "chore: upgrade the MCP TypeScript SDK from 2.0.0-beta.5 to 2.0.0"; forwards the negotiated Mcp-Protocol-Version through the remote proxy; ships the MCP Apps sandbox proxy static assets - accessed