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Optimize context window usage in Cursor with @-mentions, context pills, and conversation strategy.
Triggers on "cursor context", "context window", "context limit", "cursor memory", "context management",
"@-mentions", "context pills".
allowed-tools
Read, Write, Edit, Bash(cmd:*)
version
1.0.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
compatible-with
claude-code, codex, openclaw
tags
["saas","cursor","cursor-context"]
Cursor Context Management
Optimize how Cursor AI uses context to produce accurate, relevant responses. Context is everything the model sees when generating a response -- managing it well is the single biggest lever for output quality.
Context Sources
Cursor assembles context from multiple sources before each AI request:
┌─ Always Included ─────────────────────────────────────┐
│ System prompt (Cursor internal) │
│ Active .cursor/rules/*.mdc with alwaysApply: true │
│ Current file (for Tab, Inline Edit) │
└───────────────────────────────────────────────────────┘
┌─ Conditionally Included ──────────────────────────────┐
│ Selected code (highlighted before Cmd+L/Cmd+K) │
│ @-mention targets (@Files, @Folders, @Code) │
│ Glob-matched rules (.mdc with matching globs) │
│ Conversation history (prior turns in chat) │
│ Open editor tabs (lightweight reference) │
└───────────────────────────────────────────────────────┘
┌─ On-Demand (explicit @-mention) ──────────────────────┐
│ @Codebase → semantic search across indexed files │
│ @Docs → crawled external documentation │
│ @Web → live web search results │
│ @Git → uncommitted diff or branch diff │
│ @Lint Errors → current file lint diagnostics │
└───────────────────────────────────────────────────────┘
Context Pills
Active context appears as pills at the top of the Chat/Composer panel:
Adding too many pills fills the context window, degrading response quality
@-Mention Strategy by Task
Code Understanding
@src/auth/middleware.ts @src/types/user.ts
Explain how the JWT validation works and what happens when a token expires.
Use @Files for specific files. Avoid @Folders unless you need the full directory -- it consumes a lot of context.
Bug Investigation
@src/hooks/useCart.ts @Lint Errors @Recent Changes
The cart total is NaN after the latest changes. What broke?
@Recent Changes + @Lint Errors gives the model forensic context.
Architecture Questions
@Codebase where are database queries made?
@Codebase triggers semantic search across the indexed codebase. Good for discovery when you do not know which files are relevant. Costs more context than targeted @Files mentions.
Using External Knowledge
@Docs Prisma @Web prisma client extensions 2025
How do I add soft-delete as a Prisma Client extension?
@Docs uses pre-indexed documentation. @Web does a live search. Combine both for comprehensive answers about third-party tools.
Context Budget Management
Each model has a context limit. Overloading it causes the model to drop information silently:
Model
Context Window
Practical Limit
GPT-4o
128K tokens
~80K usable
Claude Sonnet
200K tokens
~150K usable
Claude Opus
200K tokens
~150K usable
cursor-small
8K tokens
~5K usable
Signs of Context Overflow
Model forgets instructions from earlier in the conversation
Responses become generic or repetitive
Model contradicts what it said 3 turns ago
Suggested code ignores file context you provided
Mitigation Strategies
Start new conversations frequently. One topic per conversation.
Use specific @Files, not @Folders.@src/api/users.ts is better than @src/api/.
Remove context pills you no longer need. Click x to drop stale files.
Avoid @Codebase for narrow questions. It pulls in many code chunks. Use @Files when you know the location.
Break large tasks into steps. Ask for the type definitions first, then the implementation, then the tests -- in separate turns or chats.
Automatic vs Manual Context
Cursor automatically includes context in some cases:
Feature
Automatic Context
Tab Completion
Current file + open tabs + recent edits
Inline Edit (Cmd+K)
Selected code + surrounding file
Chat (Cmd+L)
Conversation history + explicitly added context
Composer (Cmd+I)
Referenced files + codebase search
For Chat and Composer, you control context through @-mentions. Tab and Inline Edit manage their own context automatically.
.cursorignore for Context Control
Prevent files from ever being included in AI context:
# .cursorignore (project root)
# Secrets and credentials
.env
.env.*
**/secrets/
**/credentials/
# Large generated files
dist/
build/
node_modules/
*.min.js
*.bundle.js
# Data files that consume context budget
*.csv
*.sql
*.sqlite
fixtures/
Note:.cursorignore is best-effort. It prevents files from appearing in indexing and AI features, but is not a security boundary for protecting secrets. Use .gitignore and environment variables for actual secret management.
Advanced: Scoped Rules as Context
Project rules automatically inject context when relevant files are opened:
