diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b57dd5..7ed0dc9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,11 @@ one coordinated release.
 
 ## Unreleased
 
-No changes have been accepted after the first v1 release candidate.
+### Documentation
+
+- Give the installable `himesan` command its own Go package overview covering
+  installation, generation, read-only checking, local development, editor
+  integration, and machine-readable operational contracts.
 
 ## v1.0.0-rc.1 — 2026-08-24
 
diff --git a/cmd/himesan/doc.go b/cmd/himesan/doc.go
new file mode 100644
index 0000000..b72ac5f
--- /dev/null
+++ b/cmd/himesan/doc.go
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Command himesan is the development-time compiler and tooling entry point for
+// Sandwich Hime's HTML-first, ahead-of-time .sando templates.
+//
+// Hime-san generates deterministic, formatted .sando.go files beside their
+// sources. Applications commit those generated files and deploy their ordinary
+// Go program with the small Apache-2.0 sando runtime. The compiler, language
+// server, and development supervisor are not production dependencies.
+//
+// # Install
+//
+// Install the current compiler release with the Go toolchain:
+//
+//	go install gamertan.com/sandwich-hime/cmd/himesan@latest
+//
+// The compiler and runtime have independent tags. For a consuming module, add
+// the exact sando runtime release first, then install and pin the exact compiler
+// version selected by that project's documentation. The module README records
+// current release versions and the runtime-first installation sequence.
+//
+// # Generate and check
+//
+// Generate adjacent Go files for templates below the current module:
+//
+//	himesan generate ./...
+//
+// Check committed output without writing files:
+//
+//	himesan check ./...
+//
+// The shorter "gen" command aliases generate. The friendly "bless" command is
+// a read-only alias for check. Both generate and check accept --json for one
+// bounded machine-readable result.
+//
+// Generation is deterministic and replaces only compiler-owned output
+// atomically. It does not edit handwritten Go files or go.mod. Check reports
+// stale, missing, invalid, and orphaned generated output through the same
+// compiler diagnostics used by generation.
+//
+// # Local development
+//
+// The optional development supervisor regenerates templates, builds the
+// application's own net/http program, health-checks a new loopback candidate,
+// and preserves the last healthy process when a candidate fails:
+//
+//	himesan dev [flags] [package] [-- app-args...]
+//
+// Its stable local proxy and browser diagnostics are development conveniences,
+// not an application framework or production server. Projects may configure
+// the supervisor with himesan.json or use generate, check, and ordinary Go
+// tooling directly.
+//
+// # Editor integration
+//
+// The editor-neutral language server runs over standard input and output:
+//
+//	himesan lsp --stdio
+//
+// It analyzes saved sources and unsaved document overlays with the compiler's
+// parser and context model. It does not generate files, execute project code,
+// invoke Go, fetch modules, access the network, or start the development
+// supervisor.
+//
+// # Operational contracts
+//
+// Use "himesan version --json" for compiler, runtime ABI, Go, and feature
+// identity. The repository freezes the command surface, exit meanings,
+// diagnostic codes, JSON schemas, and configuration schema in its contracts
+// directory. Language syntax and contextual-safety rules are specified in
+// SPEC.md and docs/THREAT_MODEL.md at the canonical repository.
+package main
diff --git a/scripts/public-snapshot.allow b/scripts/public-snapshot.allow
index 632c20d..c2b48e5 100644
--- a/scripts/public-snapshot.allow
+++ b/scripts/public-snapshot.allow
@@ -24,6 +24,7 @@ SECURITY.md
 SPEC.md
 TRADEMARKS.md
 cmd/himesan/contract_test.go
+cmd/himesan/doc.go
 cmd/himesan/main.go
 cmd/himesan/main_test.go
 cmd/himesan-release/main.go