[BUG] MCP prompt not working with title

I have the same problem. I created an mcp server and added the same mcp server in VSCode in Copilot and it works fine. Claude Code lists the slash commands from the mcp server prompts, but when I try to run them, I get “Unknown slash command”.

All of my commands had mandatory and optional arguments based on the TypeScript mcp SDK docs

The same happens for me. I found out that the title is not allowed to contain white spaces:
I'm using @modelcontextprotocol/sdk@1.18.0

Example code:
https://github.com/vpursuit/swipl-mcp-server/blob/40f1a152e05d279c56bf8975a2ccee14c3430777/src/prompts.ts#L127

This _fails_:

quickReference: {
    name: "prolog_quick_reference",
    title: "Prolog Server Quick Reference Guide",

This _works_:

quickReference: {
    name: "prolog_quick_reference",
    title: "prolog_quick_reference",

The working slash command is:

/swipl-mcp-server:prolog_quick_reference

I guess claude shall not use property 'title', but 'name' to create the slash-command.

The same happens for me. I found out that the title is not allowed to contain white spaces: I'm using @modelcontextprotocol/sdk@1.18.0 This _fails_: `` quickReference: { name: "prolog_quick_reference", title: "Prolog Server Quick Reference Guide", ` This **_works_**: ` quickReference: { name: "prolog_quick_reference", title: "prolog_quick_reference", `` The working slash command is: /swipl-mcp-server:prolog_quick_reference I guess claude shall not use property 'title', but 'name' to create the slash-command.

will try it later today. Thanks!

This issue has been inactive for 30 days. If the issue is still occurring, please comment to let us know. Otherwise, this issue will be automatically closed in 30 days for housekeeping purposes.

Additional reproduction case

I'm experiencing the same issue with MCP prompts. When typing a slash command like /airis:agent, the autocomplete shows:

/airis:agent (MCP)    Airis Agent - session controller...

Problem: Pressing Enter does nothing. The command cannot be selected.

Workaround: Pressing Backspace to remove the trailing space, then Enter works.

Root cause analysis

Looking at the minified cli.js, I found the issue:

userFacingName(){
  let J = Z.title || Z.name;
  return \`\${Q.name}:\${J} (MCP)\`
}

The (MCP) suffix contains a space, which breaks command parsing when the user selects from autocomplete.

Suggested fix

When matching/executing the slash command, use the name field directly instead of userFacingName(). The userFacingName() should only be used for display purposes.

Something like:

// For display: "/airis:agent (MCP)"
userFacingName() { return \`\${serverName}:\${title || name} (MCP)\` }

// For command matching: "/airis:agent"
commandName() { return \`\${serverName}:\${name}\` }

This would also fix Issue #5597 (MCP prompts with optional arguments require input to invoke).

Simpler fix option: Remove the space before (MCP) or change the separator:

// Current (broken - space before parenthesis)
\`\${serverName}:\${name} (MCP)\`

// Fix 1: No space
\`\${serverName}:\${name}(MCP)\`

// Fix 2: Brackets instead
\`\${serverName}:\${name}[MCP]\`

// Fix 3: No suffix (cleanest)
\`\${serverName}:\${name}\`

The space before (MCP) is what breaks command parsing during autocomplete selection.

This issue has been automatically closed due to 60 days of inactivity. If you're still experiencing this issue, please open a new issue with updated information.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.