Cursor error
Cursor: missing tabIdentifier
missing tabIdentifierStatus: WorkaroundLast verified 2 documented fixes1 source
What it means
Xcode MCP tools called from Cursor report errors about a missing tabIdentifier because some tools need a workspace context.
Causes
- Xcode has an empty window open rather than a project or workspace.
- Xcode is not running with a project open (the xcrun mcpbridge process needs an active Xcode session).
How to fix it
- Fix 1.
Confirm you have a project or workspace open in Xcode, not an empty window.
- Fix 2.
If Cursor cannot find the xcode-tools server at all, make sure Xcode is running with a project open.
More Cursor errors
All 18 Cursor errorsAgent Execution Timed OutStatus: WorkaroundTimeout waiting for EverythingProviderStatus: Workaround<filename> is too large (4MB limit)Status: By designCursor is damagedStatus: Workaroundsuspicious activityStatus: Workaroundxcrun: error: unable to find utility "mcpbridge"Status: WorkaroundPrivate worker limit exceededStatus: By design{"error": "Too Many Requests", "message": "Rate limit exceeded. Please try again later."}Status: By design
Related reading
- Do Your Agent Hooks Fail Open? Claude Code vs Codex vs Cursor vs Gemini CLIA guard hook that crashes, times out or points at a missing script lets the tool call through by default in Claude Code. v2.1.295 adds onFailure: block. Here is what each coding agent does when your policy hook breaks, with real test runs.
- How to Keep API Keys Away From Your AI Coding Agent: Claude Code vs Codex vs Cursor vs Gemini CLIA deny rule on .env stops cat but not a Python one-liner. Here are the three layers that actually keep secrets out of a coding agent's context - file rules, environment scrubbing and credential masking - and what Claude Code, Codex, Cursor and Gemini CLI give you for each, with real test runs.
- Antigravity vs Cursor (2026): Pricing, Limits, Models, and Which to PickAntigravity vs Cursor: Antigravity is free with a weekly limit; Cursor starts at $20/month with the widest model menu. Pricing, limits and a decision guide.
- Slack Code vs Claude Code vs Cursor vs OpenCode: When Agents Belong in ChatSlack Code gives coding agents their own Slack channels with diffs, previews, and an audit log. When it beats Claude Code, Cursor, or OpenCode, and when not.
- Cursor Removes Dollar Costs From Usage Page: Tokens OnlyCursor removed dollar costs from its Usage page on July 31: self-serve plans see tokens only and the dashboard API zeroes cost fields, history included.
- AI Coding Agent Security Models Compared 2026: Permissions, Sandboxing, and Threat Models for Every Major ToolAI coding agent security models compared: how Claude Code, Cursor, Codex, Copilot, Aider and Windsurf handle permissions, sandboxing and prompt injection.
FAQ
What does "missing tabIdentifier" mean in Cursor?
Xcode MCP tools called from Cursor report errors about a missing tabIdentifier because some tools need a workspace context.
How do I fix "missing tabIdentifier"?
There are 2 documented fixes. Start with the first: Confirm you have a project or workspace open in Xcode, not an empty window.
Is this Cursor error fixed?
Status: Workaround. No release removes the cause. The documented fixes work around it.
Sources
Last verified against 1 source: official docs, maintainer replies and release notes.
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