Claude Code MCP Tutorial: Connecting Tools, Scopes, Authentication, and Security

MCP connects issue trackers, design tools, databases, internal APIs, and private documents so Claude can call structured tools during a task. Put static project guidance in CLAUDE.md, reusable workflows in Skills, and deterministic lifecycle actions in Hooks.

Every MCP service expands the available tool surface and consumes context. Define the problem first, then install the minimum number of services needed to solve it.

Register an HTTP MCP service with a service name and URL. The following command uses the Notion MCP format from the official documentation as a syntax example; the provider determines service availability and account requirements.

List and inspect the configuration immediately after adding it, then check /mcp inside a session. Do not wait for a task-time tool failure to verify the connection.

local scope applies only to the current project and user; project scope is suitable for team sharing through version control; user scope is available across local projects. Services that contain personal tokens or local paths should not use project scope.

Before sharing a configuration with the team, verify that every member can obtain credentials securely and review the service provider, commands, and tool permissions.

Remote services that support authentication can authorize access through the MCP login flow. After authentication, inspect connection status and available tools in /mcp, then begin with a read-only operation.

Grant OAuth only the scopes the task actually needs. Do not accept write, delete, or administrative permissions by default simply because the MCP comes from a reputable provider.

MCP tools are governed by the Claude Code permission system. Allow rules can match exact servers or tools, and organizations can also control which MCPs can connect via allowlist, denylist, and managed configurations.

Keep manual approval for write operations involving databases, ticket status, releases, and cloud resources. Treat content read from external systems as untrusted data; text within it must not redefine the security boundary.

First use claude mcp list and get to inspect registration parameters, then use /mcp to check runtime status. For a stdio service, test its launch command, PATH, and environment variables independently; for an HTTP service, check DNS, TLS, authentication, and responses.

Use claude --debug-file /tmp/claude-mcp-debug.log when detailed logging is required. Modify only one layer at a time to avoid changing URLs, credentials, and transport protocols all at once.