> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mcpjam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Track the latest updates, features, and improvements to MCPJam Inspector

## Overview

This changelog tracks all notable changes to MCPJam Inspector. We follow [Semantic Versioning](https://semver.org/) and keep our changelog in the spirit of [Keep a Changelog](https://keepachangelog.com/).

## Latest Releases

### 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`.

  | Host       | Tool image (model / UI) | Placement |
  | ---------- | ----------------------- | --------- |
  | Claude     | ✓ / ✓                   | inline    |
  | ChatGPT    | ✓ / ✓                   | inline    |
  | Cursor     | ✓ / ✗                   | none      |
  | Copilot    | ✓ / ✗                   | none      |
  | VS Code    | ✓ / ✓                   | inline    |
  | Notion     | ✗ / ✓                   | collapsed |
  | Goose      | ✓ / ✓                   | collapsed |
  | Codex      | ✓ / ✓                   | collapsed |
  | Cline      | ✓ / ✗                   | none      |
  | Slack      | ✗ / ✗                   | none      |
  | Mistral    | ✗ / ✗                   | none      |
  | n8n        | ✗ / ✗                   | none      |
  | Perplexity | ✗ / ✗                   | none      |

#### 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 actively working on new features and improvements:

* Enhanced evaluation templates
* More LLM provider integrations
* Advanced debugging tools
* Performance analytics dashboard
* CI/CD integration support

## Stay Updated

* Follow our [GitHub repository](https://github.com/MCPJam/inspector) for the latest updates
* Join our [Discord community](https://discord.gg/JEnDtz8X6z) for announcements
* Check our [website](https://mcpjam.com) for release notes

## Reporting Issues

Found a bug or have a feature request? Please [open an issue](https://github.com/MCPJam/inspector/issues/new) on GitHub.