Cursor Rules (.cursor/rules) are a clean way to steer Cursor’s AI inside a project. But they only work in Cursor, and team-wide rules need a Business or Enterprise plan. Here is an honest look at when a shared, cross-tool context layer fits better.
Contextium vs Cursor Rules, side by side
| Feature | Contextium | Cursor Rules |
|---|---|---|
Works across multiple AI tools | Any MCP tool | Cursor only |
Team sharing without enterprise plan | Any plan | Team Rules = Business/Ent |
Carries knowledge & docs, not just rules | Full context | Behaviour rules only |
Relevance-based loading | Loads what is relevant | Glob / agent scoping |
Cross-repo / cross-project | Workspaces | Per-repo files |
Versioning & audit trail | Built-in + event log | Via git only |
Setup effort | Add one MCP URL | Files in repo |
Starting price | Free for individuals | Included in Cursor |
Contextium is tool-agnostic. The same context reaches Cursor, Claude Code, Copilot, Gemini and any other MCP-compatible tool — so switching or mixing editors does not mean re-teaching your AI.
Cursor Rules are injected into Cursor’s own requests. They are an excellent Cursor feature, but they do nothing for Claude Code, Copilot or any other tool your team uses.
Rules tell the AI how to behave. Contextium also carries the knowledge the AI needs — architecture, decisions, conventions, project state, docs — so the answers are grounded, not just well-styled.
Cursor Rules are instructions prepended to the prompt. They shape behaviour and conventions well, but they are not a place to store the body of project knowledge your team relies on.
Share context with any teammate on any plan. Every change is versioned with an event log, so you can see who changed what and roll back — no plan gate on collaboration.
Project rules are shared by committing them to git. Centrally-enforced Team Rules exist, but only on Cursor’s Business and Enterprise plans — and still only inside Cursor.
The reasons to choose Contextium hold no matter what you're switching from.
Works with any MCP-compatible AI tool — Claude, Cursor, Copilot, Gemini and more. Your context is never trapped in one editor or model.
Relevance-based loading serves the context each task needs — not your whole knowledge base on every request.
Every change is versioned with an event log, so teams can see who changed what and roll back.
Free for individuals, one simple per-seat price for teams. No usage meters or surprise overage bills.
You do not have to drop your rules — layer context on top
Leave your Cursor-specific behaviour rules where they are. They still steer Cursor exactly as before.
Put the things every tool and teammate needs — architecture, conventions, decisions, project state — into a Contextium workspace.
Add the Contextium MCP URL to Cursor and your other AI tools. Now the same grounded context is available everywhere, versioned and shared.
No — they complement each other. Keep Cursor Rules for Cursor-specific behaviour, and use Contextium for the shared knowledge and context that every tool and teammate needs. Together you get consistent behaviour and grounded answers.
Yes. Cursor supports MCP, so you connect Contextium as an MCP server and Cursor can read your shared context directly — the same context your other tools see.
Not for Contextium. Team sharing works on any Contextium plan, so you can share context across your team without upgrading Cursor for centrally-managed Team Rules.
Contextium versions every change with an event log, so your shared context has a single, auditable source of truth rather than diverging copies across repos and teammates.
One shared context for every AI tool your team uses. Free for individuals.
Set up in minutes • Free plan available • No credit card required