docs: add environment variables to gram install command for Claude Code - PMM-671 (#78)

Co-authored-by: koladev <[email protected]>
Co-authored-by: tatenda <[email protected]>

Author: 3 people

docs/gram/clients/using-claude-code-with-gram-mcp-servers.mdx

@@ -55,9 +55,19 @@ gram install claude-code --toolset taskmaster
 This command automatically:
 - Fetches your toolset configuration from Gram
 - Derives the MCP URL and authentication settings
-- Creates the correct configuration (by default in user-level `~/.claude/settings.local.json`)
+- Creates the correct configuration (by default in user-level `~/.claude.json`)
 
-**Configuration Scopes:**
+#### Setting up environment variables
+
+If your toolset requires authentication, you'll need to set up environment variables. The `gram install` command will display the required variable names and provide the export command you need to run to set the variable value.
+
+For the Taskmaster toolset, you'll need to set the `MCP_TASK_MASTER_API_KEY` environment variable to your Taskmaster API key. You can do this by running the following command:
+
+```bash
+export MCP_TASK_MASTER_API_KEY='your-api-key-value'
+```
+
+#### Configuration Scopes
 
 You can control where the MCP server configuration is installed using the `--scope` flag:
 
@@ -211,4 +221,3 @@ If Claude Code isn't calling the tools:
 You now have Claude Code connected to a Gram-hosted MCP server with task management capabilities.
 
 Ready to build your own MCP server? [Try Gram today](/product/gram) and see how easy it is to turn any API into agent-ready tools.
-