Skip to main content

​
Overview

This changelog tracks all notable changes to MCPJam Inspector. We follow Semantic Versioning and keep our changelog in the spirit of Keep a Changelog.

​
Latest Releases

​
2026-09-02

​
Added

  • GPT-5.6 models available with your own OpenAI key — gpt-5.6-luna, gpt-5.6-sol, and gpt-5.6-terra are now selectable in the model picker under Your providers → OpenAI when you have an OpenAI API key configured. Each model has a 1,050,000-token context window. These models were already available in the free hosted catalog; this change makes them reachable for BYOK users as well.

​
2026-08-31

​
Changed

  • Public score runner redesign — the score runner landing page has been rebuilt with a new design. After you paste a public MCP server URL and click Score this server, you are now prompted for an email address before the scan starts. The scorecard is delivered to that address once the run completes. The email is preserved across OAuth redirects, so servers that require authorization before scanning still collect it. Legacy OAuth resume records that predate the email step are kept on the email prompt rather than bypassing it. The featured scores section on the landing page now shows real MCP endpoints (Linear, GitHub Copilot, Notion), and each row populates the URL field when clicked. URL examples default to Streamable HTTP at /mcp.

​
2026-06-26

​
Added

  • Compatibility destination — a new Inspector page that evaluates your connected MCP server against a catalog of AI hosts (Claude, ChatGPT, Cursor, Copilot, Codex, and others). Shows conformance gates, per-host findings split into Apps and Server lanes, and live widget rendering. Accessible from the left sidebar when a server is connected.
  • OTLP/OpenInference trace export — export eval run traces as OTLP JSON from the run detail page. Compatible with Arize Phoenix, Datadog, and any OTLP-compatible observability backend. Supports exporting a single run or the whole project, with an opt-in to include content and artifacts.
  • @mcpjam/sdk/host-compat subpackage — the shared host-compatibility engine is now importable directly. Use deriveServerRequirements, evaluateHostCompat, evaluateAllHosts, scanWidgetSource, and detectHostCompatBridgeFromMeta to build your own compatibility checks in CI or custom tooling.

​
Version 1.1.0

​
Improved

  • Code Quality
    • Improved code consistency and maintainability

​
Recent Updates

​
Added

  • VS Code and Notion market hosts (@mcpjam/sdk minor)
    • VS Code (GitHub Copilot chat panel) is now a market host in the SDK’s host-compat catalog. It renders MCP UI inline and supports all display modes (inline, fullscreen, pip). Capabilities mirror the VS Code client template; updateModelContext and message are not advertised. Provenance: probe.
    • Notion is now a market host. It is a tools-only/headless client (no widget rendering) that supports protocol version 2025-11-25. Provenance: probe.
    • Both hosts are available via buildMarketHostProfiles() / evaluateMarketHosts() and carry logos in the inspector’s host-compat UI.
  • imageSupport dimension on all market hosts (@mcpjam/sdk minor)
    • Every market host now carries an imageSupport field on its HostCompatProfile describing how it handles MCP tool-result images.
    • Three image sources are tracked per host: toolImageContent (direct MCP image blocks), embeddedResourceImages (image blobs inside MCP resources), and resourceLinkImages (image links resolved via resources/read).
    • Each source records model (whether the image is passed to the model) and ui (whether the host UI renders it).
    • A single placement value ("inline" | "collapsed" | "none") describes where rendered previews appear in the host UI.
    • New exported types: HostImageSupport, ImageSourceSupport, ImagePlacement from @mcpjam/sdk/host-compat.
    • New capability matrix: MCP_APPS_VSCODE exported from @mcpjam/sdk/host-compat.

​
Changed

  • Stateless MCP protocol version updated to 2026-07-28 RC
    • The stateless transport protocol version has been updated from the retired DRAFT-2026-v1 placeholder to the upstream RC literal 2026-07-28, matching the canonical pin in modelcontextprotocol/main.
    • The protocol version picker in the inspector UI now shows Latest (2025-11-25) and 2026 RC (2026-07-28) instead of “Latest” and “Draft”.
    • The SDK constant STATELESS_DRAFT_2026_V1 has been renamed to LATEST_STATELESS_PROTOCOL_VERSION and now equals "2026-07-28".
    • Migration required: If you had servers pinned to DRAFT-2026-v1, you must re-select the protocol version in the inspector UI. Stored DRAFT-2026-v1 pins are rejected by spec-conforming servers with a -32004 UnsupportedProtocolVersionError.

​
Added

  • OAuth Protocol 2025-03-26 Support
    • Added support for original MCP OAuth specification (2025-03-26)
    • Direct RFC8414 discovery from MCP server base URL with fallback endpoints
    • PKCE required for all clients
    • DCR and pre-registered client registration strategies
  • OAuth Debugger Enhancements
    • Edit Config button to modify server settings without reconnecting
    • Copy logs feature with guide and raw formats for debugging
    • Deprecated transport detection with migration guidance for HTTP+SSE servers
    • RFC 8707 compliant resource URL canonicalization
  • GPT-5 Model Support
    • Added support for GPT-5 model variants: gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-chat-latest, gpt-5-pro, gpt-5-codex
    • Organization verification notice for GPT-5 access

​
Improved

  • OAuth Flow
    • Refined diagram focusing and zoom behavior for better step visualization
    • Improved error handling for expected 4xx responses during transport detection
    • Enhanced header merging in OAuth state machines across all protocol versions
  • Error Handling
    • Enhanced streaming error handling in chat interface
    • Errors now display as inline alerts instead of failing silently
    • Better error messages from AI providers

​
Version 1.0.0

​
Added

  • MCP Server Connection Management
    • Support for STDIO, SSE, and Streamable HTTP transports
    • Multi-server connection support
    • Real-time connection status monitoring
  • LLM Playground
    • OpenAI integration (GPT-3.5/4)
    • Anthropic Claude integration (Claude 2/3)
    • DeepSeek AI support (DeepSeek R1)
    • Ollama local model compatibility
    • Interactive chat interface with streaming responses
  • Tools & Resources Testing
    • Tool execution and validation
    • Resource schema verification
    • Prompt testing interface
    • Real-time parameter validation
  • OAuth 2.0 Testing
    • Guided OAuth flow setup
    • Token management
    • Scope verification
    • Refresh token handling
  • MCP Evals
    • Automated compliance testing
    • Custom evaluation framework
    • Test result reporting
    • Performance benchmarking
  • Developer Tools
    • Comprehensive logging system
    • Request/response tracing
    • Error reporting and analysis
    • Performance monitoring

​
Improved

  • Enhanced UI/UX with modern design
  • Better error messages and debugging support
  • Optimized performance for large MCP responses
  • Improved documentation and examples

​
Fixed

  • Various bug fixes and stability improvements
  • Memory leak fixes in long-running sessions
  • Edge cases in MCP protocol handling

​
Coming Soon

We’re working on:
  • Enhanced evaluation templates
  • More LLM provider integrations
  • Advanced debugging tools
  • Performance analytics dashboard
  • CI/CD integration support

​
Stay Updated

​
Reporting Issues

Found a bug or have a feature request? Please open an issue on GitHub.