fix(oauth): Remove the option to force_register new clients

CLAUDE.md

@@ -135,16 +135,15 @@ Each Nextcloud app has a corresponding server module that:
 OAuth integration tests support both **automated** (Playwright) and **interactive** authentication flows:
 
 **Automated Testing (Default - Recommended for CI/CD):**
-- **Default fixtures**: `nc_oauth_client`, `nc_mcp_oauth_client` now use Playwright automation by default
+- **Default fixtures**: `nc_oauth_client`, `nc_mcp_oauth_client` use Playwright automation
 - Uses Playwright headless browser automation to complete OAuth flow programmatically
-- **Shared OAuth Client**: All test users authenticate using a single OAuth client (matching MCP server behavior)
-  - Single `client_id`/`client_secret` pair is registered and reused for all test users
-  - Stored in `.nextcloud_oauth_shared_test_client.json` with `force_register=False` for reuse
-  - Reduces OAuth client registrations and matches production MCP server architecture
+- **Shared OAuth Client**: All test users authenticate using a single OAuth client
+  - Stored in `.nextcloud_oauth_shared_test_client.json`
+  - Matches production MCP server behavior
+  - Each user gets their own unique access token
+  - Implementation: `shared_oauth_client_credentials` fixture in `tests/conftest.py:812`
 - All Playwright fixtures: `playwright_oauth_token`, `nc_oauth_client`, `nc_mcp_oauth_client`, `nc_oauth_client_playwright`, `nc_mcp_oauth_client_playwright`
 - Multi-user fixtures: `alice_oauth_token`, `bob_oauth_token`, `charlie_oauth_token`, `diana_oauth_token`
-  - All use `shared_oauth_client_credentials` fixture for consistent client credentials
-  - Each user gets unique access tokens via same OAuth client (like multiple users using the MCP server)
 - Requires: `NEXTCLOUD_HOST`, `NEXTCLOUD_USERNAME`, `NEXTCLOUD_PASSWORD` environment variables
 - Uses `pytest-playwright-asyncio` for async Playwright fixtures
 - Playwright configuration: Use pytest CLI args like `--browser firefox --headed` to customize
@@ -179,14 +178,12 @@ OAuth integration tests support both **automated** (Playwright) and **interactiv
   - `mcp-oauth` (port 8001): Uses OAuth authentication - for OAuth-specific testing
 - Start OAuth MCP server: `docker-compose up --build -d mcp-oauth`
 - **Important**: When working on OAuth functionality, always rebuild `mcp-oauth` container, not `mcp`
-- Shared OAuth client is registered once and reused across test runs
-- Client credentials cached in `.nextcloud_oauth_shared_test_client.json`
+- OAuth client credentials cached in `.nextcloud_oauth_shared_test_client.json`
 
 **CI/CD Considerations:**
 - Interactive OAuth tests are automatically skipped when `GITHUB_ACTIONS` environment variable is set
 - Automated Playwright tests will run in CI/CD environments
 - Use Firefox browser in CI: `--browser firefox` (Chromium may have issues with localhost redirects)
-- Shared client approach reduces test time and API calls to Nextcloud
 
 ### Configuration Files
 

docs/oauth-architecture.md

@@ -217,11 +217,12 @@ NEXTCLOUD_HOST=https://nextcloud.example.com
 
 **How it works**:
 1. Server checks `/.well-known/openid-configuration` for `registration_endpoint`
-2. Calls `/apps/oidc/register` to register new client
+2. Calls `/apps/oidc/register` to register a client on first startup
 3. Saves credentials to `.nextcloud_oauth_client.json`
-4. Re-registers if credentials expire
+4. Reuses these credentials on subsequent startups
+5. Re-registers only if credentials are missing or expired
 
-**Best for**: Development, testing, short-lived deployments
+**Best for**: Development, testing, quick deployments
 
 ### Pre-configured Client
 

docs/oauth-setup.md

@@ -165,23 +165,23 @@ You have two options for managing OAuth clients:
 
 ### Mode A: Automatic Registration (Dynamic Client Registration)
 
-**Best for**: Development, testing, short-lived deployments
+**Best for**: Development, testing, quick deployments
 
 **How it works**:
-- MCP server automatically registers OAuth client at startup
+- MCP server automatically registers an OAuth client on first startup
 - Uses Nextcloud's dynamic client registration endpoint
 - Saves credentials to `.nextcloud_oauth_client.json`
+- Reuses stored credentials on subsequent restarts
 - Re-registers automatically if credentials expire
 
 **Pros**:
 - Zero configuration required
 - Quick setup
-- No manual client management
+- Automatic credential management
 
 **Cons**:
 - Clients expire (default: 1 hour, configurable)
-- Must re-register on restart if expired
-- Not ideal for long-running production
+- Must have dynamic client registration enabled on Nextcloud
 
 **Configuration**: Skip to [Step 4](#step-4-configure-mcp-server) with minimal config.
 
@@ -192,8 +192,8 @@ You have two options for managing OAuth clients:
 **Best for**: Production, long-running deployments, stable environments
 
 **How it works**:
-- You manually register OAuth client via Nextcloud CLI
-- Provide client credentials to MCP server
+- You manually register an OAuth client via Nextcloud CLI
+- Provide client credentials to MCP server via environment variables
 - Credentials don't expire
 
 **Pros**:

docs/quickstart-oauth.md

@@ -151,11 +151,11 @@ curl https://your.nextcloud.instance.com/.well-known/openid-configuration
 This quick start uses **automatic client registration** which is perfect for:
 - Development
 - Testing
-- Short-lived deployments
+- Quick deployments
 
-For **production deployments**, you should:
-1. Pre-register OAuth clients manually
-2. Use dedicated client credentials
+For **production deployments**, consider:
+1. Pre-registering OAuth client manually
+2. Using dedicated client credentials that don't expire
 3. See [OAuth Setup Guide](oauth-setup.md) for production configuration
 
 ---

nextcloud_mcp_server/auth/client_registration.py

@@ -211,7 +211,6 @@ async def load_or_register_client(
     storage_path: str | Path,
     client_name: str = "Nextcloud MCP Server",
     redirect_uris: list[str] | None = None,
-    force_register: bool = True,
 ) -> ClientInfo:
     """
     Load client from storage or register a new one if not found/expired.
@@ -219,7 +218,7 @@ async def load_or_register_client(
     This function:
     1. Checks for existing client credentials in storage
     2. Validates the credentials are not expired
-    3. Registers a new client if needed
+    3. Registers a new client if needed (no stored credentials or expired)
     4. Saves the new client credentials
 
     Args:
@@ -228,7 +227,6 @@ async def load_or_register_client(
         storage_path: Path to store client credentials
         client_name: Name of the client application
         redirect_uris: List of redirect URIs
-        force_register: Force registration even if valid credentials exist
 
     Returns:
         ClientInfo with valid credentials
@@ -239,11 +237,10 @@ async def load_or_register_client(
     """
     storage_path = Path(storage_path)
 
-    # Try to load existing client unless forced to register
-    if not force_register:
-        client_info = load_client_from_file(storage_path)
-        if client_info:
-            return client_info
+    # Try to load existing client
+    client_info = load_client_from_file(storage_path)
+    if client_info:
+        return client_info
 
     # Register new client
     logger.info("Registering new OAuth client...")

pyproject.toml

@@ -22,8 +22,8 @@ asyncio_mode = "auto"
 asyncio_default_test_loop_scope = "session"
 asyncio_default_fixture_loop_scope = "session"
 log_cli = 1
-log_cli_level = "INFO"
-log_level = "INFO"
+log_cli_level = "WARN"
+log_level = "WARN"
 markers = [
     "integration: marks tests as slow (deselect with '-m \"not slow\"')",
     "oauth: marks tests as oauth (deselect with '-m \"not oauth\"')"

tests/conftest.py

@@ -762,7 +762,6 @@ async def interactive_oauth_token(oauth_callback_server) -> str:
             registration_endpoint=registration_endpoint,
             storage_path=".nextcloud_oauth_shared_test_client.json",
             redirect_uris=[callback_url],
-            force_register=False,  # Reuse existing credentials if valid
         )
 
         # First, open Nextcloud login page to establish session
@@ -852,7 +851,6 @@ async def shared_oauth_client_credentials():
             storage_path=".nextcloud_oauth_shared_test_client.json",
             client_name="Nextcloud MCP Server - Shared Test Client",
             redirect_uris=[callback_url],
-            force_register=False,  # Reuse existing credentials if valid
         )
 
         logger.info(f"Shared OAuth client ready: {client_info.client_id[:16]}...")