A single Go binary that connects to your MCP server over stdio, SSE, or HTTP, calls your tools, and asserts the results. Define assertions in YAML, run them in CI. Works with servers written in Go, TypeScript, Python, Rust, Java, or anything else that speaks MCP.
Publisher’s description
What is mcp-assert?
mcp-assert by Blackwell Systems is open-source Windows software in the developer utilities category. It is written in Go.
Installation and requirements
The publisher provides Portable installers for 64-bit and ARM64 Windows. It runs without installation (portable).
Updates and version history
The current version is 0.12.3, released on June 4, 2026. The version history goes back to April 27, 2026: 2 releases, all linked to the official files.
Popularity and file types
The source code on GitHub (blackwell-systems/mcp-assert) has 26 stars. Similar programs include WinMerge, jq and x64dbg.
Project description on GitHub: “The testing standard for MCP servers. Lint (14 rules), test, and fuzz over real stdio/SSE/HTTP transport. 18 assertion types in YAML. Found 4,794 schema issues across 55 servers. Any language, no mocks, single binary.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Portable: runs without installation
In short: mcp-assert is an open-source developer utilitie tool for 64-bit and ARM64 PCs.
Is mcp-assert safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
62E33D01C47DCCAB7E72A5E7C038D5A7681C2AAB450924AC17C9278E75836AE0· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 2 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.12.3Latest | June 4, 2026 | — | 64-bit ZIPARM64 ZIP |
| 0.6.0 | April 27, 2026 | — | 64-bit ZIPARM64 ZIP |
Install from the command line
Silent install ›winget install --id BlackwellSystems.mcp-assert -eRelated guide: How to use winget: install and update apps
Information
- Publisher
- Blackwell Systems
- Category
- Developer utilities
- Licence
- MIT
- Price
- Free
- Source code
- github.com/blackwell-systems/mcp-assert
- Written in
- Go
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- Portable
- Version
- 0.12.3
- Released
- June 4, 2026
- Added to the catalogue
- April 27, 2026
- Versions listed
- 2
- GitHub stars
- 26
- GitHub forks
- 2
- Website
- github.com
- winget ID
- BlackwellSystems.mcp-assert
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to mcp-assert
See all ›-
Open source1.2M ↓ -
Open source5.1M ↓ -
x64dbg2026.05.27An open-source user mode debugger for Windows. Optimized for reverse engineering and malware analysis.Open source95.8K ↓ -
Biome2.6.3Biome is a toolchain for web projects, aimed at providing functionalities to maintain them. It offers a formatter and linter, usable via CLI and LSP.Open source10.5K ↓ -
Open source18.8K ↓ -
Open source15.7K ↓ -
Open source28.3K ↓ -
dnSpy6.6.0dnSpyEx is a unofficial continuation of the dnSpy project which is a debugger and .NET assembly editor.Open source40.7K ↓
Frequently asked questions
Is mcp-assert free?
Yes. mcp-assert is open-source software under the MIT licence.
Is mcp-assert safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install mcp-assert with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does mcp-assert run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of mcp-assert?
The versions page lists all 2 versions with links to their official installer files, back to April 27, 2026.
Can I use mcp-assert without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to mcp-assert?
WinMerge, jq, x64dbg, Biome and delta. The alternatives page compares them.
