Cursor Context Window Full? Use Token Limits MCP
Cursor includes MCP tools for file access, search, and execution. But default tools return verbose output that bloats context. Token Limits replaces them with 8 compressed equivalents, letting you code 3-5x longer before hitting limits.
Cursor runs MCP tools locally, giving you @file, @codebase, and exec access. In January 2026, Cursor added dynamic context discovery — the agent selectively retrieves MCP tool results instead of loading everything upfront, reducing agent token usage by ~47% in their benchmarks. That helps. But default tool outputs are still verbose: a grep returns 20,000+ tokens, a file read returns 12,000+ tokens. Dynamic discovery reduces how often tools are called, not how bloated the results are when they are.
Why Cursor runs out of context
- ✓Tool outputs are verbose: grep, find, and file access return complete uncompressed data
- ✓Repeated content: same paths, headers, and line numbers repeated across results
- ✓Search bloat: every match includes the full matching line plus context
- ✓No deduplication: running the same command twice counts twice
- ✓Long sessions: tool calls accumulate, context grows linearly
Token cost of common Cursor operations
| Operation | Tokens Used | With Token Limits | Savings |
|---|---|---|---|
| @codebase search (50 files) | 18,000 | 2,200 | 88% |
| @file large file read | 15,000 | 2,700 | 82% |
| Cursor exec command | 10,000 | 1,600 | 84% |
| grep via Cursor | 16,000 | 2,400 | 85% |
| find recursive | 12,000 | 1,800 | 85% |
How to install Token Limits MCP in Cursor
Token Limits provides a drop-in MCP server that replaces Cursor's default tools with compressed equivalents.
- Install: npm install -g token-limits
- Start MCP server: token-limits mcp-server
- In Cursor: Settings (cmd+,) > Features > MCP Servers
- Add server: Name "Token Limits", Command "token-limits", Args "mcp-server"
- Restart Cursor
Before and after: Real session comparison
| Scenario | Without Token Limits | With Token Limits | Duration Extension |
|---|---|---|---|
| Heavy refactor (50 files) | 2-3 hours | 10-15 hours | 4-5x |
| Large grep session | 1-2 hours | 6-10 hours | 4-5x |
| Mixed tool usage | 2-3 hours | 8-12 hours | 3-4x |
Code in Cursor for hours, not minutes
Token Limits MCP server adds 60-80% compression on top of Cursor's built-in optimizations. Add it as an MCP server in 2 minutes — no Cursor restarts, no workflow changes.
FAQ
Does Token Limits work with Cursor?
Yes. Add Token Limits as an MCP server in Cursor Settings > Features > MCP Servers. Instant compression on all tool calls.
How long do I need to restart Cursor?
Cursor must restart after adding the MCP server. It usually takes 10-20 seconds.
Can I use Token Limits alongside other MCP servers?
Yes. Token Limits coexists with other servers. You can disable the default file_access server and use only Token Limits.
Will Token Limits slow down Cursor?
No. Compression adds minimal latency (under 50ms per call). The massive token savings make Cursor feel faster overall.
Does Token Limits require an API key?
No. The proxy and MCP server run locally on your machine. No external API calls needed.