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# MCP Connectors — Copilot CLI Canvas Extension
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# MCP Connectors
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A GitHub Copilot CLI **canvas extension** that lets you browse and add MCP
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connectors from an Azure **Connector Namespace** directly inside a Copilot CLI
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session. Search by name or category, sign in to a connector, then restart the
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session to make its tools available to the agent.
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A GitHub Copilot app canvas extension for discovering and connecting hosted MCP
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servers from [Azure Connector Namespace](https://learn.microsoft.com/en-us/azure/connector-namespace/connector-namespace-overview).
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It brings the Microsoft and partner connector catalog, guided browser sign-in,
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and connected-server management into the Copilot side panel.
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> The canvas talks to public Azure Resource Manager (`management.azure.com`)
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> using an interactive Microsoft Entra browser sign-in. It does not register its
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> own Entra application. Azure Identity persists the account session in the
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> operating system's encrypted credential store.
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## Features
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## Prerequisites
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- **GitHub Copilot CLI** (the host that loads canvas extensions).
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- A browser for Microsoft Entra sign-in. The extension prompts when Azure
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authentication is required and restores the encrypted Azure Identity session
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after extension or Copilot CLI restarts.
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- **An Azure subscription with a Connector Namespace** — resource type
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`Microsoft.Web/connectorGateways` (API version `2026-05-01-preview`). This is
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a preview resource provider; you must have access to it for the catalog to
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load. Without it the extension installs fine but has nothing to show.
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- **Connector catalog** - browse and search Microsoft and partner MCP servers
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available in your namespace.
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- **Guided Azure setup** - sign in from the canvas, then choose a subscription
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and Connector Namespace.
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- **Browser-based connection flow** - complete each connector's authentication
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or consent without leaving the setup experience.
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- **My MCPs** - see which servers are connected and ready to add to Copilot.
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- **Namespace playground** - open any connected server in the Connector
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Namespace playground with **Sandbox**.
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- **Persistent setup** - retain the selected namespace and restore Azure sign-in
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securely across app restarts.
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## Install
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Install it from the public Awesome Copilot repository:
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Open the GitHub Copilot app, go to **Settings > Plugins**, search for
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`connector-namespaces`, and select **Install**.
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```
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install_extension https://github.com/github/awesome-copilot/tree/main/extensions/connector-namespaces
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```
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You can also open the
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[MCP Connectors gallery page](https://awesome-copilot.github.com/extension/connector-namespaces/)
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and select **Install in GitHub Copilot app**.
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For a reproducible install, swap `main` for a reviewed commit SHA from this
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repository.
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## Requirements
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The destination **scope** is chosen at install time:
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- Access to an Azure subscription with a Connector Namespace. If you do not
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have one, follow the
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[Connector Namespace creation guide](https://learn.microsoft.com/en-us/azure/connector-namespace/create-connector-namespace).
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- Permission to view the namespace and create its connections and hosted MCP
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server configurations.
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- A browser for Microsoft Entra sign-in and connector consent.
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- **user** (default) — installs globally for you at
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`$COPILOT_HOME/extensions/connector-namespaces/`. The usual choice for a
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personal tool.
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- **project** — installs into the current repo.
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- **session** — scoped to a single CLI session.
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Connector Namespace is currently an Azure preview service and availability can
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vary by region.
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## Usage
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1. Open the **MCP Connectors** canvas from Copilot CLI.
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2. If prompted, choose **Sign in** and complete Microsoft Entra authentication
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in the browser. The canvas reloads your subscriptions automatically. Pick an
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Azure **subscription** and a **Connector Namespace**. The choice is saved for
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future sessions (change it any time via **Change namespace**).
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3. Browse or filter the connector catalog, then **Connect**. A browser tab
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opens for Microsoft sign-in; complete it and the canvas updates on its own.
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4. Connected connectors move into **My MCPs**. Use **Sandbox** on a tile to open
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that server directly in the namespace MCP playground.
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5. Restart the GitHub Copilot app so the agent can load the connected tools.
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1. Open the **MCP Connectors** canvas in the GitHub Copilot app.
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2. Select **Sign in to Azure** and complete Microsoft Entra authentication in
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your browser.
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3. Choose an Azure subscription and Connector Namespace.
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4. Browse or search the catalog, then select **Connect** on an MCP server.
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5. Complete the connector's sign-in or consent flow when prompted.
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6. Confirm the server appears under **My MCPs**.
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7. Restart the GitHub Copilot app so the new tools become available to the
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agent.
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The extension registers the native `connector_namespaces_open_playground` tool,
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so GitHub Copilot can open a named connector from **My MCPs** without installing
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an additional Agent Skill.
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Use **Sandbox** on a connected server to inspect it in the Connector Namespace
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playground. Use **Change namespace** to switch subscriptions or namespaces.
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## How it works
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## Authentication and privacy
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- `extension.mjs` — entry point; declares the canvas, `open_sandbox` action, and
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native `connector_namespaces_open_playground` tool.
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- `server.mjs` — a loopback HTTP server (bound to `127.0.0.1` only) that serves
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the canvas UI and the JSON/authentication endpoints the iframe calls.
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- `auth.mjs` — `InteractiveBrowserCredential` broker for sign-in lifecycle,
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cancellation, encrypted token-cache persistence, and ARM token refresh.
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- `armClient.mjs` — thin ARM client (public ARM base only, SSRF-guarded path
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segments).
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- `catalog.mjs` — fetches and curates the connector list for a namespace.
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- `install.mjs` — the connect/install pipeline (managed-API connection, consent,
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rollback on cancel, and native HTTPS MCP config registration).
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- `renderer.mjs` — all canvas HTML/CSS/client JS.
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- `sandbox.mjs` — builds namespace playground links and resolves named My MCPs.
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- `state.mjs` — saved namespace and connector state.
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Azure sign-in and connector sign-in are separate:
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## Privacy & security
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- **Azure sign-in** lets the canvas discover and manage Connector Namespace
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resources. The account cache is stored in the operating system's encrypted
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credential store; raw access and refresh tokens are not written to extension
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files.
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- **Connector sign-in** grants an individual MCP server access to its backing
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service. The resulting connection is managed by Connector Namespace.
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- ARM tokens come from `@azure/identity`'s `InteractiveBrowserCredential` and
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are never logged. Azure Identity stores its refreshable account cache through
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the operating system's encrypted credential store. A non-secret account
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locator is saved with user-only permissions so a new process can select that
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cache entry; the extension never writes raw tokens to its artifact files.
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- All servers bind to loopback (`127.0.0.1`) and are never exposed externally.
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- ARM requests go only to `https://management.azure.com/`; path segments are
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validated to prevent SSRF-style host smuggling.
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- The minted gateway API key is stored in the selected Copilot MCP config and
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sent to its validated HTTPS endpoint as the `X-API-Key` header.
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The canvas serves its interface from loopback only (`127.0.0.1`). Azure
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management requests are restricted to `https://management.azure.com/`.
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The gateway API key that lets Copilot reach a connected server is stored in the
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user-scoped GitHub Copilot MCP configuration and sent only to that server's
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configured HTTPS endpoint.
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## License
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Alex Yang (DevDiv)