Developer Releases Rust Sidecar to Block MCP Tool Replay Attacks

A developer released arcstone-mcp-sidecar, an open-source Rust capability-gating tool that uses single-use credentials and atomic file locks to block replay and mutated-retry attacks on MCP tool calls in local LLM setups.

2026-09-22 ~ 2026-09-22 · 2 related posts

• arcstone-mcp-sidecar: A Rust Sidecar That Blocks MCP Tool Call Replay Attacks with Atomic File Locks — AdmissibilityScience · 2026-09-22
• Rust single-use claim gate stops tool replay and duplicate execution in local LLM workflows — AdmissibilityScience · 2026-09-22