Backpressure and concurrency control middleware for [FastMCP](https://github.com/jlowin/fastmcp) MCP servers.
Most developer tooling work still happens through a UI a human drives. MCP Backpressure MCP server moves it into the conversation instead. Backpressure and concurrency control middleware for FastMCP MCP servers.
The server publishes 3 tools. What each one is for:
Parameters — The Parameters tool exposed by this serverMetrics — print(f"Active: {metrics.active}") print(f"Queued: {metrics.queued}") print(f"Total rejected: {metrics.total_rejected}") print(f"RejectedLinting — The Linting tool exposed by this serverInstallation goes through your MCP client rather than a global install: point it at mcp-backpressure 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 Backpressure's toolset — Parameters, Metrics, Linting — is a fair guide to whether it matches your workflow. It is maintained by nulone; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against MCP Backpressure's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Parameters | The Parameters tool exposed by this server. |
| Metrics | print(f"Active: {metrics.active}") print(f"Queued: {metrics.queued}") print(f"Total rejected: {metrics.total_rejected}") print(f"Rejected (concurrency): {metrics.rejected_concurrency_limit}") print(f"Rejected (queue full |
| Linting | The Linting tool exposed by this server. |
{
"mcpServers": {
"backpressure": {
"command": "uvx",
"args": ["mcp-backpressure"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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