MCPFlo v0.1.0

Features

• add "All" history tab with unified cross-server activity log (29c1a97)
• add @mcpflo/server-everything test-fixture MCP server (0d89c22)
• add a Tokens tab — response footprint and definition footprint (e506ecf)
• add an OAuth auth details panel to the server detail view (0ca6754)
• add context-budget card to the server details view (e8c44f0)
• add context-budget token-estimation utility (208b7d0)
• add disconnect action to server rows (b773408)
• add expand/collapse all control to sidebar header (e7e17cb)
• add pretty JSON tree view for result panels (78bed3a)
• add protocol version override for MCP connections (85fa484)
• add Tools/Resources/Prompts sections to the server details view (2fac48e)
• cancel an in-flight capability fetch (55077bd)
• encrypt server credentials at rest with safeStorage (33a2cfb)
• keep transport secrets in main, operate on servers by id (29946fa)
• prefill the form when activating a tool/prompt from the "All" tab (2e09e03)
• replace KEY=VALUE textareas with key/value row editor (270d521)
• select a server to open its (placeholder) details view (7cdbef2)
• server details header and action bar (25372d4)
• tooltip and hover affordance on context-budget bar segments (8668acb)
• track token issue time so hydration reports honest auth status (8d00fc5)

Bug Fixes

• allowlist scheme before shell.openExternal (7a578a4)
• block OAuth over cleartext http to non-loopback hosts (c29ab37)
• block top-level navigation to non-app origins in main window (690ae03)
• bundle preload deps so sandboxed preload can load them (7b0229a)
• clear cached capabilities when disconnecting a server (f18b579)
• close spawned MCP server processes on app quit (c948799)
• correct token footprint tokenizer label to o200k_base (a48196a)
• disconnect a server's live process when it's removed (685c916)
• e2e specs broken by the server-row chevron/select split (45a3627)
• enable Chromium renderer sandbox (e7b4f2f)
• exempt MCP-UI resources from the response size cap (490587e)
• initialize captured to satisfy TS definite-assignment check (4110e03)
• prepare server-everything package for npm publish (9253b15)
• report finishAuth failures instead of leaving the row stuck pending (40b463b)
• sign out disconnects the server and restore auth status on launch (9198b27)
• stop misdiagnosing ordinary connect failures as DCR failures (8026ea1)
• stop selecting a server from forcing a connect attempt (24fc755)
• suppress stale re-auth browser tab on mid-session token expiry (52ef73e)
• tooltip colors track the app's actual theme, not OS preference (ca33b60)
• validate OAuth callback state before honoring error/settling the flow (f5cebc2)
• validate server id in IPC handlers before it reaches fs paths (9f8a4ae)

MCPFlo v0.0.6

The first public release of MCPFlo — a visual testing tool for MCP (Model Context Protocol) servers. Connect to any MCP server, browse what it exposes, and inspect its capabilities. Think Postman, but for MCP.

⚠️ Early development. MCPFlo is brand new and moving fast. Connecting and browsing work today; tool calling and visual chains are next on the roadmap. Expect rapid change.

What's in this release

• Connect over stdio — spawn a local MCP server from a command and args (e.g. npx -y @modelcontextprotocol/server-memory)
• Connect over Streamable HTTP — point MCPFlo at a remote MCP endpoint
• Browse capabilities — every tool, resource, and prompt the server exposes, discovered automatically on connect and shown in a navigable tree

Downloads

Platform	File
macOS (Apple Silicon)	mcpflo-0.0.6-arm64.dmg
Windows (Intel / x64)	mcpflo-0.0.6-x64-setup.exe
Windows (ARM64)	mcpflo-0.0.6-arm64-setup.exe

macOS Intel and Linux builds aren't included in this release.

Installing on macOS

These builds aren't signed with an Apple Developer ID or notarized yet, so Gatekeeper will warn on first launch. To open:

1. In Finder, right-click (or Control-click) MCPFlo.app → Open
2. Click Open in the dialog

macOS remembers this for every launch afterward. (Terminal alternative: xattr -dr com.apple.quarantine /Applications/MCPFlo.app)

Feedback

Found a bug or have an idea? Open an issue: https://github.com/harshalslimaye/mcpflo/issues