Problem: I’ve hit my Cursor Pro limit and switched to my own Gemini API Key. I am now constantly hitting “200K context” or “Rate Limit” errors even on small tasks.
Issues:
Context Bloat: Even in small files, the token count jumps to 180k+ after just a few messages.
Efficiency: Cursor seems to be re-sending the entire chat history and excessive codebase context with every prompt.
Usage: I am on a paid Google Tier, but I’m still being throttled almost immediately.
Questions:
Is there a way to limit the “hidden context” Cursor sends (history/indexing) to stay under the 200K limit?
Does Cursor have a routing bug with Gemini API keys that triggers these limits prematurely?
What are the best .cursorignore or settings tweaks to stop small tasks from eating the entire context window?
Any other best practises to make this work? Otherwise, I am thinking about switching over to Claude pro.
Context window problems usually come from a few things:
Too many tool calls or MCPs
Too many agent rules
To understand what’s happening, hover over the context usage to see the active rules.
For MCPs, enable only what you need. Scope MCPs per project, and keep global MCPs small.
Hey, this is a known issue with Gemini API keys. The team is already working on a fix.
Two things:
429 error “Provider returned 429”
Cursor is currently using a regional endpoint instead of the global one, which causes dynamic quota issues on Google’s side. Even on a paid tier, you’ll keep getting 429 errors. More details and discussion in the main thread: Gemini API key doesn't work with the latest Cursor version
200K vs 1M limit
If you’re seeing a 200K limit, Max Mode is off. Gemini 3 Flash only gives 1M context with Max Mode enabled. Check via CMD+Shift+/ or the model selector dropdown.
Temporary workaround to reduce context size:
Hover over the context usage indicator to see which rules are active
Disable any unnecessary MCP servers (if you have them)
