mcp-fuse: A Proxy to Intercept MCP Errors and Prevent LLM Token Waste
Western_Suggestion48 · reddit · 2026-08-10
To solve the issue of AI agents burning tokens by endlessly retrying failed servers, a developer released mcp-fuse, an open-source transparent proxy.
- Core Features: Sitting between MCP hosts and stdio servers, it automatically retries transient errors with backoff, circuit-breaks dead servers, and forwards at most one compact guidance message to the model (e.g., "Rate limited, system retries automatically, do not re-invoke"), preventing the model from reading verbose error logs and looping.
- Safety: Silent replays are gated on readOnlyHint/idempotentHint annotations to avoid double-firing side effects on non-idempotent tools. It also provides a full JSONL audit trail.
- Performance: In a flaky-server benchmark, it successfully reduced hundreds of error tokens into clean, successful calls with zero error tokens.
Currently supporting stdio servers, it can be configured via npx mcp-fuse init.
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