diff --git a/README.md b/README.md
index c9ddf35..0e0d4f6 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,17 @@ the Rust crate into the room by the ankle.
 dotnet test
 ```
 
+## Package Boundary
+
+Aquarium consumes this library as a pinned `AquariumSynth.Dsl` NuGet package,
+not as a live project reference. Breaking synth-library work should happen here
+freely, then Aquarium should intentionally update only after a new package
+version is packed and tested.
+
+```powershell
+dotnet pack src\AquariumSynth.Dsl\AquariumSynth.Dsl.csproj -c Release
+```
+
 ## Shape
 
 - `PatchScript.Parse(script)` lowers terse script into `SynthPatch`.
diff --git a/src/AquariumSynth.Dsl/AquariumSynth.Dsl.csproj b/src/AquariumSynth.Dsl/AquariumSynth.Dsl.csproj
index b760144..9651933 100644
--- a/src/AquariumSynth.Dsl/AquariumSynth.Dsl.csproj
+++ b/src/AquariumSynth.Dsl/AquariumSynth.Dsl.csproj
@@ -4,6 +4,17 @@
     <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <PackageId>AquariumSynth.Dsl</PackageId>
+    <Version>0.1.0-aquarium.1</Version>
+    <Authors>GameCult</Authors>
+    <Company>GameCult</Company>
+    <Description>Aquarium synth patch DSL model, parser, analysis helpers, and Faust source emitter.</Description>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://github.com/GameCult/AquariumSynthCSharp</RepositoryUrl>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="..\..\README.md" Pack="true" PackagePath="\" />
+  </ItemGroup>
+
 </Project>
diff --git a/state/evidence.jsonl b/state/evidence.jsonl
index 8bb6ddb..d99f3b8 100644
--- a/state/evidence.jsonl
+++ b/state/evidence.jsonl
@@ -7,3 +7,4 @@
 {"kind":"reference_synth_roadmap","lesson":"AquariumSynthCSharp should use external synth and DSP corpora as reference targets, not just internal demo patches. Start with DX7/Dexed SysEx for structured FM, then ZynAddSubFX, Faust examples/libraries, Surge XT, and Cardinal as progressively broader pressure tests. Keep provenance and license state explicit before vendoring fixtures.","source":"user clarified any synth can be broken down and rebuilt via Aquarium DSL"}
 {"kind":"runtime_patch_parameters","lesson":"Synth patches must expose expressive runtime parameters. Faust supports this through UI controls and hosted parameter APIs, so Aquarium should compile a graph once and vary declared parameter values without recompilation. Recompile only for structural graph changes.","source":"user asked whether Faust can vary one number without recompiling"}
 {"kind":"synth_test_ownership","lesson":"AquariumSynthCSharp owns reference-patch correctness. Aquarium should only smoke-test the engine synth host and bundled Faust boundary; SFXR/BFXR/reference parity belongs here so the engine can keep moving while the synth library is under active surgery.","source":"user questioned synth tests living in Aquarium"}
+{"kind":"package_boundary","lesson":"Aquarium consumes AquariumSynth.Dsl through a pinned package, not a live project reference. Breaking changes in AquariumSynthCSharp are allowed during synth construction as long as a new package version is packed and Aquarium is updated deliberately when the boundary should move.","source":"user wanted Aquarium builds insulated from synth-agent work"}
diff --git a/state/map.yaml b/state/map.yaml
index a4cec04..11d2d89 100644
--- a/state/map.yaml
+++ b/state/map.yaml
@@ -14,6 +14,7 @@ surfaces:
   library: src/AquariumSynth.Dsl
   tests: tests/AquariumSynth.Dsl.Tests
   reference_roadmap: docs/reference-synth-roadmap.md
+  package: AquariumSynth.Dsl 0.1.0-aquarium.1
 modules:
   model: src/AquariumSynth.Dsl/Model.cs
   parser: src/AquariumSynth.Dsl/PatchScript.cs
@@ -38,4 +39,5 @@ boundaries:
     - Faust source and target-code generation
 checks:
   default: dotnet test
+  package: dotnet pack src/AquariumSynth.Dsl/AquariumSynth.Dsl.csproj -c Release
   faust_validation: automatic in tests when Faust is installed