Show HN: Callwitness – record what your AI agent's tools return

Category: observability

Tags: mcp, ai-agents, audit-log, proxy, tamper-evident, observability

Score: 7.3/10 (Innovation: 7, Technical: 7, Documentation: 9, Utility: 6)

Callwitness is a transparent proxy and recorder for AI agent tool interactions (MCP servers) that forwards all bytes unchanged while writing a hash-chained, tamper-evident log. It enables auditing and verification of agent behavior without blocking or delaying operations, addressing a growing need for observability in AI agent deployments.

Target audience: devops, backend developers, AI engineers, security auditors

Repository: https://github.com/AditiChaudharyy14/callwitness · Python · MIT · 3 stars

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