diff --git a/mcp-proxy/doc.go b/mcp-proxy/doc.go
new file mode 100644
index 0000000..1741b00
--- /dev/null
+++ b/mcp-proxy/doc.go
@@ -0,0 +1,4 @@
+// Package mcpproxy provides an MCP (Model Context Protocol) proxy server
+// that handles authentication, routing, and request transformation for
+// MCP-compatible agent tools.
+package mcpproxy
diff --git a/sdk/go/receipt/doc.go b/sdk/go/receipt/doc.go
new file mode 100644
index 0000000..597051b
--- /dev/null
+++ b/sdk/go/receipt/doc.go
@@ -0,0 +1,3 @@
+// Package receipt provides types and functions for creating, validating,
+// and verifying agent receipts - cryptographic attestations of agent actions.
+package receipt
diff --git a/sdk/go/store/doc.go b/sdk/go/store/doc.go
new file mode 100644
index 0000000..07dc23f
--- /dev/null
+++ b/sdk/go/store/doc.go
@@ -0,0 +1,3 @@
+// Package store provides storage backends for agent receipts,
+// including in-memory and persistent implementations.
+package store