diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4006a8..8d36041 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 4.0.1
+
+- Made the published PyPI package and official MCP Registry the primary local
+  installation path in the README and deployment guides.
+- Added `uvx` and pinned-release examples for stdio and loopback HTTP use.
+- Clarified that source checkout setup is for contributors and unreleased
+  changes, while preserving the operator-owned credential model.
+
 ## 4.0.0
 
 - Added the local-first MCP launcher, Docker/Compose self-hosting path, and
diff --git a/MCP_SETUP.md b/MCP_SETUP.md
index 1a1bb54..18916df 100644
--- a/MCP_SETUP.md
+++ b/MCP_SETUP.md
@@ -58,7 +58,7 @@ Expected result:
 ```json
 {
   "status": "ok",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "mcp": {
     "enabled": true,
     "url": "https://YOUR-SERVICE.onrender.com/mcp",
diff --git a/README.md b/README.md
index 78dd746..048884d 100644
--- a/README.md
+++ b/README.md
@@ -31,10 +31,53 @@ endpoints remain available for backward compatibility, including
 
 ## Start here
 
-### Run the local MCP server
+### Use the published package (recommended)
 
-The default path is local MCP over stdio. Provider credentials remain in your
-environment and the process does not open a public network port.
+Partuno is published on [PyPI](https://pypi.org/project/partuno/) and listed in
+the [official MCP Registry](https://registry.modelcontextprotocol.io/). The
+recommended local MCP launcher is:
+
+```bash
+uvx --from partuno partuno-mcp
+```
+
+This downloads the current published release and runs the default local stdio
+transport. To pin the current release exactly, use:
+
+```bash
+uvx --from 'partuno==4.0.1' partuno-mcp
+```
+
+MCP clients that accept a local command can use `uvx` with these arguments:
+
+```json
+{
+  "command": "uvx",
+  "args": ["--from", "partuno", "partuno-mcp"]
+}
+```
+
+Keep your operator-owned DigiKey and Mouser credentials in the MCP client's
+environment. See the [local deployment guide](docs/deployment/local.md) for
+the supported variables and the [native MCP setup guide](MCP_SETUP.md) for
+operator-owned remote deployments. For a hosted directory listing, see
+[Partuno on Glama](https://glama.ai/mcp/servers/JPMarhefka/partuno).
+
+### Install with pip
+
+If `uvx` is not available, install the published package into an existing
+Python environment:
+
+```bash
+python3 -m pip install partuno
+partuno-mcp
+```
+
+<details>
+<summary><strong>Develop from source</strong></summary>
+
+Use a checkout only when contributing, running unreleased changes, or needing
+the repository's `.env.example` and test suite:
 
 ```bash
 git clone https://github.com/JPMarhefka/partuno.git
@@ -43,19 +86,16 @@ python3 -m venv .venv
 source .venv/bin/activate
 python -m pip install -r requirements.txt
 cp .env.example .env
+set -a
+source .env
+set +a
 python -m partuno
 ```
 
-Then configure your MCP client to launch `python -m partuno` from the checkout.
-See [MCP setup](MCP_SETUP.md) and the [local deployment guide](docs/deployment/local.md).
-For a hosted directory listing, see [Partuno on Glama](https://glama.ai/mcp/servers/JPMarhefka/partuno).
-
-After the `partuno` PyPI package is published, the equivalent package-based
-launcher is:
+See the [local deployment guide](docs/deployment/local.md) for loopback HTTP
+and source-checkout details.
 
-```bash
-uvx --from partuno partuno-mcp
-```
+</details>
 
 ### Self-host a remote MCP server
 
@@ -217,7 +257,7 @@ default and does not require Partuno OAuth.
 
 ## Project status
 
-Partuno 4.0.0 is an active open-source release. The test suite covers offline
+Partuno 4.0.1 is an active open-source release. The test suite covers offline
 provider contracts, MCP tool behavior, REST compatibility, credential safety,
 normalization, and the multi-distributor workflows. Live provider calls are
 opt-in because they require operator credentials and are subject to provider
diff --git a/VALIDATION.md b/VALIDATION.md
index b60cba3..1081301 100644
--- a/VALIDATION.md
+++ b/VALIDATION.md
@@ -13,7 +13,7 @@ contracts, cross-distributor normalization, and Cart confirmation safety.
 
 ```json
 {
-  "version": "4.0.0",
+  "version": "4.0.1",
   "full_paths": 45,
   "full_operations": 52,
   "compact_paths": 34,
diff --git a/app.py b/app.py
index e39a1b0..227688d 100644
--- a/app.py
+++ b/app.py
@@ -30,7 +30,7 @@ def mcp_health() -> dict[str, Any]:
     )
     return {
         "status": "ok" if mcp_active else "disabled",
-        "version": "4.0.0",
+        "version": "4.0.1",
         "mcp": {
             "enabled": mcp_active,
             "url": mcp_url,
diff --git a/docs/deployment/local.md b/docs/deployment/local.md
index 8ecb39a..cb8d1a2 100644
--- a/docs/deployment/local.md
+++ b/docs/deployment/local.md
@@ -4,29 +4,28 @@ Partuno's default distribution path is a local MCP process. It does not need
 Render, Azure, a database, Redis, or a Partuno account. Provider credentials
 stay in the operator's environment.
 
-## Quick start
+## Quick start with the published package
 
-From a checkout of the repository:
+For normal use, launch the published PyPI package with `uvx`:
 
 ```bash
-python3 -m venv .venv
-source .venv/bin/activate
-python -m pip install -r requirements.txt
-cp .env.example .env
-set -a
-source .env
-set +a
-python -m partuno
+uvx --from partuno partuno-mcp
 ```
 
 The default transport is MCP stdio, which is the safest path for desktop MCP
-clients. Configure the client to launch `python -m partuno` from this
-directory. The process does not open a listening network socket.
+clients. Configure the client to launch `uvx` with `--from partuno partuno-mcp`.
+The process does not open a listening network socket.
+
+For an exact reproducible release, pin the package version:
+
+```bash
+uvx --from 'partuno==4.0.1' partuno-mcp
+```
 
 For clients that require HTTP, use the loopback-only transport:
 
 ```bash
-python -m partuno --transport streamable-http --host 127.0.0.1 --port 8000
+uvx --from partuno partuno-mcp --transport streamable-http --host 127.0.0.1 --port 8000
 ```
 
 The MCP endpoint is `http://127.0.0.1:8000/mcp`. The default bind host must
@@ -38,19 +37,30 @@ an authenticated and encrypted reverse proxy.
 Set only credentials obtained by the operator from the relevant provider. A
 local DigiKey MCP process accepts an optional `DIGIKEY_ACCESS_TOKEN` for
 catalog and account calls; it is never returned by a tool or written to logs.
-Mouser search and account capabilities use their corresponding API-key
-variables in `.env.example`.
+Mouser search and account capabilities use `MOUSER_SEARCH_API_KEY` and
+`MOUSER_ACCOUNT_API_KEY`. The complete variable reference is in the
+[`.env.example`](../../.env.example) file.
 
 Do not put credentials in MCP tool arguments, source control, screenshots, or
 client configuration files that are shared with other people.
 
-## Installed command
+## Develop from source
 
-After installing the project with `python -m pip install -e .`, the equivalent
-command is:
+Use a repository checkout when contributing, testing unreleased changes, or
+needing the example environment file:
 
 ```bash
-partuno-mcp
+git clone https://github.com/JPMarhefka/partuno.git
+cd partuno
+python3 -m venv .venv
+source .venv/bin/activate
+python -m pip install -r requirements.txt
+cp .env.example .env
+set -a
+source .env
+set +a
+python -m partuno
 ```
 
-Run `partuno-mcp --help` to see the transport options.
+The published package exposes the same `partuno-mcp` command. Run
+`partuno-mcp --help` to see the transport options.
diff --git a/docs/guides/README.md b/docs/guides/README.md
index 0d2d551..650e873 100644
--- a/docs/guides/README.md
+++ b/docs/guides/README.md
@@ -4,8 +4,16 @@ These are practical entry points for people looking for a DigiKey MCP server,
 Mouser MCP server, electronics BOM MCP server, or AI component-sourcing tool.
 Each guide includes setup, a public demo, supported workflows, and limitations.
 
-When Partuno's website is published, use these guides as the source content for
-the following descriptive routes:
+Partuno is published on [PyPI](https://pypi.org/project/partuno/) and listed in
+the [official MCP Registry](https://registry.modelcontextprotocol.io/). For
+normal local use, launch it with:
+
+```bash
+uvx --from partuno partuno-mcp
+```
+
+When Partuno's website is published, these guides can also be adapted into the
+following descriptive routes:
 
 - [`/digikey-mcp-server/`](digikey-mcp-server.md)
 - [`/mouser-mcp-server/`](mouser-mcp-server.md)
diff --git a/docs/guides/digikey-mcp-server.md b/docs/guides/digikey-mcp-server.md
index d61c573..3967e90 100644
--- a/docs/guides/digikey-mcp-server.md
+++ b/docs/guides/digikey-mcp-server.md
@@ -24,22 +24,18 @@ Use Partuno to:
 
 ## Setup
 
-The default deployment is local MCP over stdio. Credentials remain in the
-operator's environment and no public network port is required:
+The default deployment is local MCP over stdio. Partuno is published on PyPI,
+so the shortest setup is:
 
 ```bash
-git clone https://github.com/JPMarhefka/partuno.git
-cd partuno
-python3 -m venv .venv
-source .venv/bin/activate
-python -m pip install -r requirements.txt
-cp .env.example .env
-python -m partuno
+uvx --from partuno partuno-mcp
 ```
 
-Then configure the MCP client to launch `python -m partuno` from the checkout.
-See the [native MCP setup guide](../../MCP_SETUP.md) for local and
-operator-owned remote deployments.
+Credentials remain in the operator's environment and no public network port is
+required. See the [local deployment guide](../deployment/local.md) for the
+supported credential variables and the [native MCP setup guide](../../MCP_SETUP.md)
+for operator-owned remote deployments. Use the source-checkout path only when
+contributing or testing unreleased changes.
 
 ## Supported MCP workflows
 
diff --git a/docs/guides/electronics-bom-mcp.md b/docs/guides/electronics-bom-mcp.md
index 3ab73f2..2d2dd99 100644
--- a/docs/guides/electronics-bom-mcp.md
+++ b/docs/guides/electronics-bom-mcp.md
@@ -42,21 +42,16 @@ previews.
 
 ## Setup
 
-The default path is local MCP over stdio:
+The default path is local MCP over stdio. Partuno is published on PyPI:
 
 ```bash
-git clone https://github.com/JPMarhefka/partuno.git
-cd partuno
-python3 -m venv .venv
-source .venv/bin/activate
-python -m pip install -r requirements.txt
-cp .env.example .env
-python -m partuno
+uvx --from partuno partuno-mcp
 ```
 
-Configure the MCP client to launch `python -m partuno` from the checkout. The
-[native MCP setup guide](../../MCP_SETUP.md) also covers loopback HTTP and an
-operator-owned remote deployment.
+Configure the MCP client to launch `uvx` with `--from partuno partuno-mcp`.
+The [local deployment guide](../deployment/local.md) covers credential
+variables and loopback HTTP, while the [native MCP setup guide](../../MCP_SETUP.md)
+covers an operator-owned remote deployment.
 
 ## Supported MCP workflows
 
diff --git a/docs/guides/mouser-mcp-server.md b/docs/guides/mouser-mcp-server.md
index 93dc26b..204e8ef 100644
--- a/docs/guides/mouser-mcp-server.md
+++ b/docs/guides/mouser-mcp-server.md
@@ -24,22 +24,18 @@ Use Partuno to:
 
 ## Setup
 
-Start with the [native MCP setup guide](../../MCP_SETUP.md). For a local
-deployment, install Partuno and configure the operator-owned Mouser keys in the
-environment alongside the DigiKey settings:
+For a local deployment, launch the published package and configure the
+operator-owned Mouser keys in the environment alongside the DigiKey settings:
 
 ```bash
-git clone https://github.com/JPMarhefka/partuno.git
-cd partuno
-python3 -m venv .venv
-source .venv/bin/activate
-python -m pip install -r requirements.txt
-cp .env.example .env
-python -m partuno
+uvx --from partuno partuno-mcp
 ```
 
 Mouser Search and Account API keys remain separate. They are read from the
 deployment configuration and are never supplied as MCP tool parameters.
+See the [local deployment guide](../deployment/local.md) for the supported
+variables and the [native MCP setup guide](../../MCP_SETUP.md) for
+operator-owned remote deployments.
 
 ## Supported MCP workflows
 
diff --git a/main.py b/main.py
index cb15deb..6ffee36 100644
--- a/main.py
+++ b/main.py
@@ -107,7 +107,7 @@
 
 app = FastAPI(
     title="Partuno",
-    version="4.0.0",
+    version="4.0.1",
     description=(
         "Open-source MCP server for DigiKey and Mouser electronic component research, "
         "BOM analysis, sourcing comparison, and safe distributor workflows. "
diff --git a/mcp_server.py b/mcp_server.py
index 3f595de..a9f434b 100644
--- a/mcp_server.py
+++ b/mcp_server.py
@@ -384,7 +384,7 @@ def build_mcp_server(*, local: bool = False) -> FastMCP | None:
 
     mcp = FastMCP(
         name="Partuno",
-        version="4.0.0",
+        version="4.0.1",
         website_url=None if local else settings.mcp_base_url,
         auth=auth_provider,
         instructions=(
diff --git a/pyproject.toml b/pyproject.toml
index d78e138..c56ace9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "partuno"
-version = "4.0.0"
+version = "4.0.1"
 description = "Provider-neutral DigiKey and Mouser MCP server for electronic component research, BOM analysis, and sourcing comparison"
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/server.json b/server.json
index 73ee4a4..c6f9913 100644
--- a/server.json
+++ b/server.json
@@ -16,13 +16,13 @@
       "sizes": ["any"]
     }
   ],
-  "version": "4.0.0",
+  "version": "4.0.1",
   "packages": [
     {
       "registryType": "pypi",
       "registryBaseUrl": "https://pypi.org",
       "identifier": "partuno",
-      "version": "4.0.0",
+      "version": "4.0.1",
       "runtimeHint": "uvx",
       "packageArguments": [
         {
diff --git a/tests/test_mcp.py b/tests/test_mcp.py
index 04a25dc..30f03ce 100644
--- a/tests/test_mcp.py
+++ b/tests/test_mcp.py
@@ -111,10 +111,10 @@ def test_public_metadata_uses_partuno_brand_and_version() -> None:
     schema = app.openapi()
 
     assert app.title == "Partuno"
-    assert app.version == "4.0.0"
+    assert app.version == "4.0.1"
     assert schema["info"]["title"] == "Partuno"
     assert "Open-source MCP server" in schema["info"]["description"]
-    assert mcp_health()["version"] == "4.0.0"
+    assert mcp_health()["version"] == "4.0.1"
 
 
 def test_openapi_operation_ids_are_unique_and_expose_no_ordering_api() -> None: