A composable middleware framework for building MCP server chains, inspired by Ruby Rack. MCP Chain lets you create transparent proxies that sit
A composable middleware framework for building MCP server chains, inspired by Ruby Rack. MCP Chain lets you create transparent proxies that sit between MCP clients and servers, transforming requests and responses using Python functions. Exposed over MCP by the mcp chain mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.
Everything the assistant can do here goes through one of these:
Installation — The Installation tool exposed by this serverTesting — The Testing tool exposed by this serverPublishing — Releases are automatically published to PyPI via GitHub Actions on new releasesInstallation goes through your MCP client rather than a global install: point it at mcp-chain on PyPI and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. MCP Chain's toolset — Installation, Testing, Publishing — is a fair guide to whether it matches your workflow. It is maintained by ruliana; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against MCP Chain's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Installation | The Installation tool exposed by this server. |
| Testing | The Testing tool exposed by this server. |
| Publishing | Releases are automatically published to PyPI via GitHub Actions on new releases. |
{
"mcpServers": {
"chain": {
"command": "uvx",
"args": ["mcp-chain"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
Kill hallucinated APIs — version-accurate, up-to-date library documentation injected straight into context.
Microsoft's official browser automation server — drive a real browser through the accessibility tree, no screenshots needed.
GitHub's official server — repos, issues, pull requests, Actions and code security, straight from your assistant.
Issue tracking at the speed of conversation — Linear's official hosted server with OAuth and zero install.
Local repository surgery — status, diffs, commits, branches and history for any repo on disk.
Timezone sanity for AI — current time anywhere and correct conversions, without the model doing date math.