diff --git a/.changes/extension-install-boundary.changed.md b/.changes/extension-install-boundary.changed.md
new file mode 100644
index 00000000..589e755a
--- /dev/null
+++ b/.changes/extension-install-boundary.changed.md
@@ -0,0 +1 @@
+Extension 安装改为只确认 published Release；Python 兼容性和已加载版本保护在启用前执行。
diff --git a/.changes/peer-runtime-identity.changed.md b/.changes/peer-runtime-identity.changed.md
new file mode 100644
index 00000000..807b8643
--- /dev/null
+++ b/.changes/peer-runtime-identity.changed.md
@@ -0,0 +1 @@
+Publish each running Peer's application version with its runtime identity.
diff --git a/app/business/extension/main.py b/app/business/extension/main.py
index db307d7b..17a7ab43 100644
--- a/app/business/extension/main.py
+++ b/app/business/extension/main.py
@@ -251,21 +251,15 @@ def _resolve(
       raise ExtensionCompatibilityError(
         f"{name}@{version} is not available for this operation"
       )
-    association = require_python_association(release)
-    return release, association
+    return release
 
   async def install(self, name: str, version: str) -> InstalledExtension:
     validate_coordinate(name, version)
     existing = await self.store.get(name)
     if existing is not None and existing.version == version:
       return existing
-    loaded_version = self._loaded_versions.get(name)
-    if loaded_version is not None and loaded_version != version:
-      raise ExtensionRestartRequiredError(
-        f"{name} {loaded_version} was already imported; restart before installing {version}"
-      )
     release_client, _ = await self._operation_consumers()
-    release, _ = await asyncio.to_thread(
+    release = await asyncio.to_thread(
       self._resolve,
       name,
       version,
@@ -323,13 +317,20 @@ async def _operation_consumers(
 
   async def _acquire(self, state: InstalledExtension):
     release_client, distribution_consumer = await self._operation_consumers()
-    release, association = await asyncio.to_thread(
+    release = await asyncio.to_thread(
       self._resolve,
       state.name,
       state.version,
       allow_yanked=True,
       release_client=release_client,
     )
+    association = require_python_association(release)
+    loaded_version = self._loaded_versions.get(state.name)
+    if loaded_version is not None and loaded_version != state.version:
+      raise ExtensionRestartRequiredError(
+        f"{state.name} {loaded_version} was already imported; "
+        f"restart before enabling {state.version}"
+      )
     acquired = await asyncio.to_thread(distribution_consumer.acquire, release, association)
     return association, acquired
 
diff --git a/app/business/peer/AGENTS.md b/app/business/peer/AGENTS.md
index 2cf9afa2..c8b12543 100644
--- a/app/business/peer/AGENTS.md
+++ b/app/business/peer/AGENTS.md
@@ -15,6 +15,6 @@
 - `route_to_peer` is a caller-local constraint and never enters payload/advertisement。
 - A normal response or outcome-unknown dispatch stops generic failover。
 - HTTP absolute URLs come only from owner config + fixed inbound paths；do not infer them from bind host or requests。
-- Browser runtimes register with an ordinary `peers` upsert whose payload contains only
-  runtime-owned `id`、`name`、`config_schema` and `capabilities`; omitted owner-authored
-  `config` and `labels` must remain unchanged.
+- Peer runtimes register with an ordinary `peers` upsert. A default `name` is inserted only for a
+  new identity; registration refreshes runtime-owned `application_version` and `config_schema`
+  without replacing Human-owned `name`、`config` or `labels`.
diff --git a/app/business/peer/main.py b/app/business/peer/main.py
index 54c334a1..7de8f379 100644
--- a/app/business/peer/main.py
+++ b/app/business/peer/main.py
@@ -22,6 +22,7 @@
   normalize_capability_snapshot,
 )
 from app.settings import settings
+from app.version import APPLICATION_VERSION
 
 from .contracts import (
   CapabilityDelegationUnavailable,
@@ -58,7 +59,10 @@ async def register_self(cls) -> PeerModel:
     """Upsert runtime-owned identity/schema without changing owner configuration."""
     async with peer_uow() as peers:
       peer = await peers.register(
-        settings.peer_id, settings.peer_name, cls._config_contract.json_schema()
+        settings.peer_id,
+        settings.peer_name,
+        APPLICATION_VERSION,
+        cls._config_contract.json_schema(),
       )
     logger.info("Peer registered", extra={"peer": str(peer.id), "name": peer.name})
     return peer
diff --git a/app/database_contract/catalog.py b/app/database_contract/catalog.py
index 91836f99..19009ea0 100644
--- a/app/database_contract/catalog.py
+++ b/app/database_contract/catalog.py
@@ -255,7 +255,8 @@ def development_baseline_fingerprint(
         (
           "development_peer",
           sql.SQL(
-            "SELECT id::text, name, labels, config, config_schema, capabilities, "
+            "SELECT id::text, name, application_version, labels, config, config_schema, "
+            "capabilities, "
             "EXTRACT(EPOCH FROM lease_expires_at)::bigint, "
             "EXTRACT(EPOCH FROM created_at)::bigint "
             "FROM {}.peers WHERE id = %s"
diff --git a/app/database_contract/constants.py b/app/database_contract/constants.py
index fbf7db7b..d5c78755 100644
--- a/app/database_contract/constants.py
+++ b/app/database_contract/constants.py
@@ -4,7 +4,7 @@
 
 
 CONTRACT_FORMAT = 1
-CONTRACT_REVISION = "peer-extension-setup-v1"
+CONTRACT_REVISION = "peer-runtime-identity-v1"
 
 PROTOCOL_SCHEMA = "inkcre"
 INTERNAL_SCHEMA = "inkcre_internal"
diff --git a/app/database_contract/readiness.py b/app/database_contract/readiness.py
index d2a7d218..328912e7 100644
--- a/app/database_contract/readiness.py
+++ b/app/database_contract/readiness.py
@@ -510,7 +510,7 @@ def _seed_component(cursor, profile: str) -> dict[str, Any]:
     return {"status": "not_required"}
   cursor.execute(
     sql.SQL(
-      "SELECT name, labels, config, config_schema, capabilities, "
+      "SELECT name, application_version, labels, config, config_schema, capabilities, "
       "lease_expires_at, created_at, updated_at "
       "FROM {}.peers WHERE id = %s"
     ).format(sql.Identifier(PROTOCOL_SCHEMA)),
@@ -519,6 +519,7 @@ def _seed_component(cursor, profile: str) -> dict[str, Any]:
   row = cursor.fetchone()
   expected = (
     DEVELOPMENT_PEER_NAME,
+    None,
     ["development", "canonical-seed"],
     {},
     {},
diff --git a/app/persistence/peer/repository.py b/app/persistence/peer/repository.py
index 9eea4bac..886d3e7c 100644
--- a/app/persistence/peer/repository.py
+++ b/app/persistence/peer/repository.py
@@ -16,14 +16,26 @@ class PeerRepository:
   def __init__(self, session: AsyncSession) -> None:
     self._session = session
 
-  async def register(self, peer_id: PeerRef, name: str, schema: dict) -> PeerModel:
+  async def register(
+    self,
+    peer_id: PeerRef,
+    name: str,
+    application_version: str,
+    schema: dict,
+  ) -> PeerModel:
     statement = insert(PeerModel).values(
-      id=peer_id, name=name, labels=[], config={}, config_schema=schema, capabilities=[]
+      id=peer_id,
+      name=name,
+      application_version=application_version,
+      labels=[],
+      config={},
+      config_schema=schema,
+      capabilities=[],
     )
     statement = statement.on_conflict_do_update(
       index_elements=["id"],
       set_={
-        "name": statement.excluded.name,
+        "application_version": statement.excluded.application_version,
         "config_schema": statement.excluded.config_schema,
       },
     ).returning(PeerModel)
diff --git a/app/schemas/peer/main.py b/app/schemas/peer/main.py
index 382e165f..250c4abf 100644
--- a/app/schemas/peer/main.py
+++ b/app/schemas/peer/main.py
@@ -111,6 +111,10 @@ class PeerModel(sqlmodel.SQLModel, table=True):
     ),
   )
   name: str = sqlmodel.Field(sa_column=sqlalchemy.Column(sqlalchemy.Text, nullable=False))
+  application_version: str | None = sqlmodel.Field(
+    default=None,
+    sa_column=sqlalchemy.Column(sqlalchemy.Text, nullable=True),
+  )
   labels: list[str] = sqlmodel.Field(
     default_factory=list,
     sa_column=sqlalchemy.Column(
diff --git a/app/version.py b/app/version.py
index 1b7d6e70..1ca57f6a 100644
--- a/app/version.py
+++ b/app/version.py
@@ -1,3 +1,9 @@
-"""Core Extension Host SDK version, independent of the service package version."""
+"""Core application and Extension Host SDK versions."""
+
+from pathlib import Path
+import tomllib
 
 CORE_VERSION = "0.3.0"
+APPLICATION_VERSION = tomllib.loads(
+  (Path(__file__).parents[1] / "pyproject.toml").read_text(encoding="utf-8")
+)["project"]["version"]
diff --git a/docs/40-deployment/database-contract.md b/docs/40-deployment/database-contract.md
index 58ab5217..e9e874e4 100644
--- a/docs/40-deployment/database-contract.md
+++ b/docs/40-deployment/database-contract.md
@@ -76,10 +76,12 @@ Deleting a referenced `storages` catalog row is `RESTRICT`。Changing/deleting a
 
 ## Peer Discovery Protocol
 
-`peers` 持有 deployment Peer identity、owner config/schema、完整 capability/inbound snapshot 与
-`lease_expires_at`。Capability snapshot 是 runtime-owned derived projection；`labels` 不参与 routing，readiness
-不进入 advertisement。HTTP inbound 的 absolute URL 只由当前 Peer 的 `config.http_public_base_url` 与固定业务 path
-组合，Peer row 不再持有通用 `rest_api_url`。
+`peers` 持有 deployment Peer identity、应用版本、owner config/schema、完整 capability/inbound snapshot 与
+`lease_expires_at`。Peer runtime 在注册时写入自己的 `application_version`，供管理界面识别实际运行的应用；它不替代
+Extension Host SDK 的兼容性版本。旧行可以暂时为 `NULL`，Peer 再次注册后自然补齐。注册只在首次创建 identity 时写入
+默认名称，后续刷新应用版本和 schema 时保留 Human 修改的名称、配置与标签。Capability snapshot 是 runtime-owned
+derived projection；`labels` 不参与 routing，readiness 不进入 advertisement。HTTP inbound 的 absolute URL 只由当前
+Peer 的 `config.http_public_base_url` 与固定业务 path 组合，Peer row 不再持有通用 `rest_api_url`。
 
 `renew_peer_lease(peer uuid, ttl_seconds integer) -> timestamptz` 是 `SECURITY INVOKER`、database-time helper。
 调用者提供正 TTL；不存在的 Peer 或非正 TTL 明确失败。普通 Peer row update 不续租，graceful shutdown 清空 expiry，
diff --git a/docs/_shared b/docs/_shared
index 5aa97e62..d87049c4 160000
--- a/docs/_shared
+++ b/docs/_shared
@@ -1 +1 @@
-Subproject commit 5aa97e6243dce02dd27c5f58eda345be2ba47297
+Subproject commit d87049c49ba10f0a710022dce23abcd316127b3c
diff --git a/migrations/revision-integrity.json b/migrations/revision-integrity.json
index ffd12e48..aff994ef 100644
--- a/migrations/revision-integrity.json
+++ b/migrations/revision-integrity.json
@@ -8,6 +8,7 @@
     "3f7a9c2d5e1b_merge_extension_registry_feature_retrieval.py": "a12ebb2f37a00dcc13b6dea6b7f9be0f6870d57530e8d234eb934c080d027c07",
     "50b2c08dd267_add_relation_endpoint_indexes.py": "56a0dbfd5e032fa57b125e478940ff89254c167b38fe0a7a98046498577d13e5",
     "77cd53ad8080_add_global_jobs_crons_and_source_runtime.py": "8eda54520a7099c957ee6a1b5e6e48d5ee2b3dbe18b0dea4b6a5246dbef04bd2",
+    "a0465e3b028f_add_peer_application_version.py": "6ba72a21e6361cd92c5977856602105498be0f4ea6e6454330dfdb89e3b50253",
     "a1b2c3d4e5f6_add_clients_modify_extensions_enabled.py": "15292a9fcf834474c8453e3d1d9db962962fb5d729bc0b80053615cf71315b96",
     "a8b9c0d1e2f3_add_ai_registry_and_profiles.py": "4c9346dac54e797ba8cb6fa7dfa8604482a114905bea88d3ff71b32fb9da5246",
     "b8c1d2e3f4a5_native_extension_distribution_cutover.py": "c0527edff210a9646c69de2da01c2877bce4acbc05af969c5bfb8d1a3fd0d3c8",
diff --git a/migrations/versions/a0465e3b028f_add_peer_application_version.py b/migrations/versions/a0465e3b028f_add_peer_application_version.py
new file mode 100644
index 00000000..6f2848d7
--- /dev/null
+++ b/migrations/versions/a0465e3b028f_add_peer_application_version.py
@@ -0,0 +1,52 @@
+"""add peer application version
+
+Revision ID: a0465e3b028f
+Revises: d41cc84db0c5
+Create Date: 2026-09-22 20:24:20.666591
+
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+from app.database_contract import INTERNAL_SCHEMA, PROTOCOL_SCHEMA
+
+
+revision: str = "a0465e3b028f"
+down_revision: str | Sequence[str] | None = "d41cc84db0c5"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+_CONTRACT_REVISION = "peer-runtime-identity-v1"
+_PREVIOUS_CONTRACT_REVISION = "peer-extension-setup-v1"
+
+
+def _set_contract_revision(value: str) -> None:
+  op.execute(
+    sa.text(
+      f"""
+      UPDATE "{INTERNAL_SCHEMA}".contract_state
+      SET contract_revision = :revision,
+          updated_at = statement_timestamp()
+      WHERE singleton
+      """
+    ).bindparams(revision=value)
+  )
+
+
+def upgrade() -> None:
+  op.add_column(
+    "peers",
+    sa.Column("application_version", sa.Text(), nullable=True),
+    schema=PROTOCOL_SCHEMA,
+  )
+  _set_contract_revision(_CONTRACT_REVISION)
+  op.execute("NOTIFY pgrst, 'reload schema'")
+
+
+def downgrade() -> None:
+  _set_contract_revision(_PREVIOUS_CONTRACT_REVISION)
+  op.drop_column("peers", "application_version", schema=PROTOCOL_SCHEMA)
+  op.execute("NOTIFY pgrst, 'reload schema'")
diff --git a/tests/peer/integration/test_peer_runtime.py b/tests/peer/integration/test_peer_runtime.py
index dcf0f07d..f324f73a 100644
--- a/tests/peer/integration/test_peer_runtime.py
+++ b/tests/peer/integration/test_peer_runtime.py
@@ -10,6 +10,7 @@
 from app.business.peer import PeerHTTPInbound, PeerManager
 from tests.database import TestSession
 from app.schemas.peer import PEER_HTTP_PROTOCOL, PeerModel
+from app.version import APPLICATION_VERSION
 
 
 pytestmark = pytest.mark.skipif(
@@ -41,6 +42,9 @@ def test_real_snapshot_database_lease_and_candidate_filtering(monkeypatch, async
     with TestSession() as db:
       local_row = db.get(PeerModel, local)
       assert local_row is not None
+      assert local_row.application_version == APPLICATION_VERSION
+      local_row.name = "Human name"
+      local_row.application_version = "0.0.0"
       local_row.config = {"http_public_base_url": "https://local.example/root/"}
       db.add(local_row)
       now = (
@@ -84,6 +88,10 @@ def test_real_snapshot_database_lease_and_candidate_filtering(monkeypatch, async
       )
       db.commit()
 
+    registered_again = async_runner.run(PeerManager.register_self())
+    assert registered_again.name == "Human name"
+    assert registered_again.application_version == APPLICATION_VERSION
+
     published = async_runner.run(PeerManager.publish_self())
     assert published.capabilities == [
       {