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mcp-fuse

v0.2.0

Published

Zero-config MCP resilience proxy: wrap any MCP server, stop token-burning error loops

Vulnerabilities

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Links

Git

Maintainers

gorealaigorealaiyoadelkayamyoadelkayam

Keywords

mcpmodel-context-protocolproxyresilienceretrycircuit-breakerrate-limitllmagentsclaudecursor

Readme

mcp-fuse

Deterministic failure handling for MCP. Stop letting your LLM debug your network.

When an MCP server rate-limits or dies, the raw error lands in your agent's context window — and the agent retries, and retries, burning tokens and corrupting context. mcp-fuse is a zero-config proxy that moves retries, backoff, and circuit breaking back into deterministic code, forwarding at most one compact, actionable message to the model.

Protect every server you have

npx mcp-fuse init        # rewrites your MCP config (Claude Code/Desktop, Cursor); writes backups
npx mcp-fuse init --dry-run
npx mcp-fuse init --unwrap

Or wrap one server

npx mcp-fuse wrap -- npx -y @modelcontextprotocol/server-github

What it does

  • Silent retry with exponential backoff for transient failures (deadline-aware, 5s budget)
  • Honors Retry-After — long waits become instant fail-fast + cooldown, not hangs
  • Circuit breaker per tool; open circuits fail in ~0ms
  • Idempotency gate: never double-executes tools with side effects (gated on readOnlyHint/idempotentHint annotations)
  • Attaches a machine-readable MCP Error Policy payload under _meta for policy-aware hosts
  • Full audit trail: --verbose, --log-file audit.jsonl — nothing is hidden unrecoverably

Docs, spec, and measured benchmarks: https://github.com/YoadElkayam/mcp-fuse

MIT