Mastering Cursor AI: Billing, Tools, and Pro Tips for Efficient Development

Billing Model

Cursor now uses a unified billing system where every interaction—whether in Agent or chat mode—counts as one interaction. Users receive 500 free interactions per cycle; beyond that, each extra interaction costs about $0.15. The new MAX mode provides larger context and removes the 25‑tool limit, but charges based on the underlying model's token cost with a 20% service fee.

Cursor Tools

files&folders : Read specific files or directories to focus Cursor on relevant code.

docs : Load documentation; if the path ends with a slash, Cursor reads all pages under that URL.

git : Retrieve git commits for comparison.

past chat : Reference previous conversations to provide context.

cursor rules : Apply custom rules during a session.

terminals : Send terminal error output to Cursor for troubleshooting.

linter errors : Report code style violations (rarely used).

web : Perform web searches before responding (rarely used).

Usage Tips

Open multiple independent dialog tabs (Ctrl/Cmd+T) instead of using the plus button to avoid losing interaction quota. Apply the single‑responsibility principle by keeping each dialog focused on one task, and decompose complex requirements into smaller subtasks. Use @past chats to import relevant previous dialogs, and let Cursor generate summary diagrams (PlantUML or Mermaid) for documentation.

Cursor Rules

Rules define how Cursor behaves. They are split into user rules (personal) and project rules (team). Rule types include:

always : Always applied.

auto attached : Matched via regex (e.g., file extensions).

agent requested : Invoked when the model decides it’s needed.

manual : Only applied when manually specified.

Rules are stored in .mdc files and can be edited via the Cursor settings UI.

Common Pitfalls

Cursor may fail to read JAR files, leading to generic Object responses; explicitly specify RPC methods and fields. It can also “take shortcuts” by masking failures—verify generated code before committing. Use checkpoints sparingly; rely on version control for robust rollback, and always review Cursor's modifications to avoid unintended bugs.