# Install mcpsnoop with Homebrew Transparent proxy and TUI for debugging MCP traffic. Version 0.17.0 via Homebrew; verified 2026-08-01. ## Install ```sh sudo av install brew:mcpsnoop ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install mcpsnoop ``` Evidence: local Homebrew formula metadata ## Package facts - **Package key:** brew:mcpsnoop - **Package manager:** Homebrew - **Package manager page:** - **Version:** 0.17.0 - **Source summary:** Transparent proxy and TUI for debugging MCP traffic - **Homepage:** - **Repository:** - **License:** MIT - **Source archive:** - **Last updated:** 2026-08-01T03:22:33Z - **Generated:** 2026-08-04T22:13:35+00:00 ## Executables - mcpsnoop (cli) - mcpsnoop (alias) ## Build dependencies - go ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-08-04 - Package-manager version: 0.17.0 - Package-manager updated: 2026-08-01 - Local data: ok - Upstream repository: https://github.com/kerlenton/mcpsnoop - Upstream latest detected: v0.17.0 (current) ## Project history and usage mcpsnoop is a transparent proxy and terminal interface for observing Model Context Protocol traffic between an actual AI client and its MCP servers. It captures JSON-RPC frames from stdio or streamable-HTTP connections and supports live inspection, replay, export, comparison, and automated checks. ### Project history The project appeared publicly in June 2026 with an initial v0.1.0 release. It was designed to complement MCP Inspector by sitting directly in the client's real data path rather than establishing a separate inspection connection. ### Adoption history The project distributes a single Go binary through GitHub releases, `go install`, and Homebrew. Its early release series moved from v0.1.0 in June 2026 to v0.16.0 in July 2026, adding workflows for saved sessions and CI-oriented protocol checks alongside the interactive TUI. ### How it is used For stdio servers, users replace the configured server command with `mcpsnoop -- ` and run `mcpsnoop` separately to open the TUI. For streamable HTTP, `mcpsnoop http` acts as a reverse proxy. Commands can reopen, export, compare, replay, validate, and prune captured sessions. ### Why package nerds care mcpsnoop brings packet-inspection conventions to MCP without requiring a language-specific SDK or modified server. Its single-binary packaging and CI exit codes make captured agent-tool traffic usable both interactively and as a reproducible test artifact. ### Timeline - 2026: The official repository and v0.1.0 release appeared on June 27. - 2026: Version v0.16.0 was released on July 27. ### Related projects - MCP Inspector is the official comparison point; mcpsnoop differs by observing the user's real client-server connection. - Model Context Protocol and JSON-RPC define the traffic mcpsnoop captures and validates. ### Sources - - - - - source_facts.package-manager ## Security Notes No matching local secret-handling manifest was found for mcpsnoop. Package metadata is still published here so future coverage has a stable package URL. ## Configuration and credential file locations These source-backed paths show where this package keeps local settings or durable credentials. Automic Vault can use them as review targets for secret scanning, migration, and command approval. ## Configuration files - Unix: ./.mcpsnoop.toml ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** mcpsnoop - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Related links - [Source-control packages](https://pkg.so/source-control-tools/) - Belongs to a source-control command family. - [MCP tool packages](https://pkg.so/mcp-tools/) - Mentions MCP or Model Context Protocol. - [Terminal utility packages](https://pkg.so/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Networking and protocol packages](https://pkg.so/networking-protocol-tools/) - Matched network, protocol, or remote-service metadata. - [go](https://pkg.so/brew/go/) - Build dependency declared by Homebrew. - [proxyfor](https://pkg.so/brew/proxyfor/) - Local package facts share a topical domain. Shared terms: proxy, traffic, tui. - [chdig](https://pkg.so/brew/chdig/) - Local package facts share a topical domain. Shared terms: debugging, tui. - [chrome-devtools-mcp](https://pkg.so/brew/chrome-devtools-mcp/) - Local package facts share a topical domain. Shared terms: debugging, mcp. ## Combined YAML source View the package source record on GitHub. [combined/mcpsnoop.yml](https://github.com/mxcl/pkgdb/blob/main/combined/mcpsnoop.yml) ## Sources - pkg.so package database - package-page enrichment - curated configuration and credential file locations - curated package history - package version freshness - package relationship graph - cross-ecosystem install command graph