diff --git a/packages/host/apiproxy/src/api/sessions.ts b/packages/host/apiproxy/src/api/sessions.ts
index 00e2511862..5579e638ee 100644
--- a/packages/host/apiproxy/src/api/sessions.ts
+++ b/packages/host/apiproxy/src/api/sessions.ts
@@ -6,7 +6,9 @@
 
 import type { ContentBlock } from '@deepseek-ai/dsh-llm/types'
 import type { SessionEvent, SessionId, TodoItem } from '@deepseek-ai/dsh-session/types'
-import type { SessionProjectionMap } from '@deepseek-ai/dsh-session-projection'
+// The pure-type outlet: api/ is browser-importable, and the package root's
+// cordis Context merge (via dsh-agent) must not enter client aggregates.
+import type { SessionProjectionMap } from '@deepseek-ai/dsh-session-projection/types'
 import type { RpcId, RpcRequest, RpcResponse } from './rpc.ts'
 import type { ToolEventView } from './events.ts'
 import type { WorkspaceId } from './workspace.ts'
diff --git a/packages/session-projection/session-projection/package.json b/packages/session-projection/session-projection/package.json
index 8066645272..d4da79599d 100644
--- a/packages/session-projection/session-projection/package.json
+++ b/packages/session-projection/session-projection/package.json
@@ -15,12 +15,17 @@
       "types": "./lib/types/invariant.d.ts",
       "default": "./lib/invariant.js"
     },
+    "./types": {
+      "types": "./lib/types/types.d.ts",
+      "default": "./lib/types/types.js"
+    },
     "./src/*": "./src/*",
     "./package.json": "./package.json"
   },
   "files": [
     "lib/index.js",
     "lib/invariant.js",
+    "lib/types/**/*.js",
     "lib/types/**/*.d.ts",
     "lib/types/**/*.d.ts.map",
     "src"
diff --git a/packages/session-projection/session-projection/src/index.ts b/packages/session-projection/session-projection/src/index.ts
index 41d2793166..47f66e98ea 100644
--- a/packages/session-projection/session-projection/src/index.ts
+++ b/packages/session-projection/session-projection/src/index.ts
@@ -25,13 +25,9 @@ declare module 'cordis' {
   }
 }
 
-/**
- * The single projection type table for the whole chain (host provider, wire
- * block, client cell, React hook). Domain packages merge their key here via
- * declaration merging; values are wire-JSON whole values. How a value is
- * rendered is the slot system's business, never this layer's.
- */
-export interface SessionProjectionMap {}
+import type { SessionProjectionMap } from './types.ts'
+
+export type { SessionProjectionMap } from './types.ts'
 
 /**
  * One domain's host-side contribution: the current whole value of its
diff --git a/packages/session-projection/session-projection/src/types.ts b/packages/session-projection/session-projection/src/types.ts
new file mode 100644
index 0000000000..39f2aa24e2
--- /dev/null
+++ b/packages/session-projection/session-projection/src/types.ts
@@ -0,0 +1,17 @@
+/**
+ * Pure-type outlet of the session-projection seam: the one projection type
+ * table, importable from client aggregates without dragging the host-side
+ * cordis Context merges of the package root (dsh-agent → dsh-session). Domain
+ * packages may declare-merge through either the package root or this outlet —
+ * re-export preserves symbol identity, so both land on the same table.
+ *
+ * @module @deepseek-ai/dsh-session-projection/types
+ */
+
+/**
+ * The single projection type table for the whole chain (host provider, wire
+ * block, client cell, React hook). Domain packages merge their key here via
+ * declaration merging; values are wire-JSON whole values. How a value is
+ * rendered is the slot system's business, never this layer's.
+ */
+export interface SessionProjectionMap {}
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 46b9e07203..f2f42116be 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -41,6 +41,7 @@
       "@deepseek-ai/dsh-session/invariant": ["./packages/core/session/src/invariant.ts"],
       "@deepseek-ai/dsh-session/types": ["./packages/core/session/src/types.ts"],
       "@deepseek-ai/dsh-session/surface": ["./packages/core/session/src/surface.ts"],
+      "@deepseek-ai/dsh-session-projection/types": ["./packages/session-projection/session-projection/src/types.ts"],
       "@deepseek-ai/dsh-llm/types": ["./packages/llm/llm/src/types.ts"],
       "@deepseek-ai/dsh-llm/brand": ["./packages/llm/llm/src/brand.ts"],
       "@deepseek-ai/dsh-tools/presentation": ["./packages/core/tools/src/presentation.ts"],