Fix 'claude mcp add: unknown option --command' in the Claude Code CLI
No --command flag exists. Use -- to pass the command: claude mcp add myserver -- npx -y server. All options go before the server name.
Topic
How To
Tactical how-to / step-by-step / troubleshooting
Make scenario won't trigger: 7-step webhook diagnosis
Seven sequential checks to diagnose a Make scenario that won't run: covers webhooks, polling triggers, incomplete executions queue, scheduling, and timezone issues.
How to fix n8n OAuth callback URL returning 401
Three causes of the n8n OAuth callback 401 and the exact fixes: WEBHOOK_URL mismatch, stale credentials after a domain change, and X (Twitter) OAuth1/OAuth2 endpoint confusion.
Cursor: fix 'Waiting for extension host' hang
The 'Waiting for extension host' hang blocks Cursor's AI agent and extensions. Four fixes in order of effort: restart the host, disable extensions, wipe the state database, or update Cursor.
n8n Loop node only processes the first item: how to fix it
The Loop Over Items node only processes one batch when processing nodes aren't wired back to its input. Here's the exact fix, plus the Merge node pattern for conditional branches.
How to fix n8n webhook not firing (test URL vs production URL gotcha)
n8n has two webhook URLs: test (/webhook-test/) and production (/webhook/). Using the wrong one for your mode causes silent failures. Here is how to check which URL your integration is calling and how to fix it.
How to fix n8n webhook returning 403 instead of 401 for invalid Basic Auth
n8n returns 403 Forbidden (not 401) when Basic Auth credentials are wrong - breaking browser re-challenge flows. Three workarounds: nginx proxy, Header Auth, or the pending patch in PR #26402.
Build an AI Sales Agent: Tools, Workflow, and Prompts
Five-scenario Make or n8n architecture plus the four prompt elements (tone, structure, fallback, formatting) that stop an AI sales agent from silently dropping qualification questions.
Slack user_huddle_changed event: when it fires and how to use it in n8n
user_huddle_changed fires on Slack Huddle entry and exit. Requires users:read. Here is the full payload, how it differs from user_change, and how to handle it in n8n.
How to export and import n8n workflows (JSON, CLI, and UI)
Three ways to export and import n8n workflows: UI download, CLI bulk export, and node copy-paste. Plus the credential re-linking step most guides skip.