Every MCP Tool Call My AI Makes Now Gets a Signed Receipt

When an AI agent calls a tool via MCP (the protocol agents use to interact with external services), it tells you what it did. But that's a claim — not evidence. The logs are self-reported. There's no independent proof of what was actually sent or received. Agent Receipts is an open protocol that puts a signing proxy between the MCP client and server. Every tool call gets an Ed25519-signed, hash-chained receipt — a W3C Verifiable Credential you can independently verify without trusting the proxy...