{"version":"2.1.292","anchor":"mcp-prompt-commands-arguments-parsed-from-the-trimmed-input","canonical_anchor":"mcp-prompt-commands-arguments-parsed-from-the-trimmed-input","heading":"MCP prompt commands trim what you type and check it before running","tier":"notice","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292\/e\/mcp-prompt-commands-arguments-parsed-from-the-trimmed-input","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.292","markdown":"### MCP prompt commands trim what you type and check it before running\n\nMCP prompt commands now split trimmed text into arguments and run a check that can stop the command before the prompt is fetched\n\n**Unclear.** What the new check tests before the prompt is fetched is not known.\n\n**What**\n\nMCP servers, outside programs that give Claude Code extra abilities, can offer prompts that you run as slash commands. When you run one, Claude Code now:\n\n- trims spaces from the start and end of what you typed, then splits it into arguments\n\n- runs a check that can stop the command with an error before the prompt is requested from the server\n\n**Why**\n\nExtra spaces at the start or end of what you type no longer turn into empty arguments.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}