How to keep context between Claude and Cursor

Design in Claude, build in Cursor — and stop re-explaining the plan in the editor. A concrete workflow for carrying decisions and constraints across the handoff.

To keep context between Claude and Cursor, you have to move the decisions and constraints out of the chat and into something both tools can read — because Claude and Cursor share nothing by default. The reliable approach is to make Claude end each design session with a written decision record, commit that record where Cursor can see it, and re-feed it at the start of every implementation session. A memory layer that both tools connect to automates that handoff; a Markdown file in the repo does a cruder version of the same thing.

This post is the concrete workflow, not the theory. The theory — why the two tools are siloed in the first place — is covered in Can AI remember across different tools. Here we assume you already know it forgets and you just want the loss to stop.

Why does the Claude to Cursor handoff lose context?

Claude is built by Anthropic; Cursor is a separate editor with its own workspace model. A design conversation you have in Claude is stored in Anthropic's product and is invisible to Cursor. When you switch to the editor to implement, Cursor sees your files and whatever you type — not the reasoning that produced the plan.

The damage is specific. It is not that Cursor forgets the feature exists; your code makes that obvious. It is that Cursor forgets the constraints you and Claude agreed on: the latency budget, the library you ruled out, the error-handling convention, the reason you chose one schema over another. Those live only in the Claude thread, so Cursor cheerfully suggests code that violates them.

What should the Claude design session produce?

Treat the Claude conversation as a meeting that has to end with minutes. Before you leave it, ask Claude to produce a short, structured decision record. Not a transcript — a distilled artefact. A good one contains:

• Decisions — what was chosen, in one line each ("Use Postgres with a single denormalised events table").
• Rejected options and why — the alternatives you considered and the reason you dropped them, so they do not get re-proposed in the editor.
• Constraints — hard limits the implementation must respect ("endpoint must respond under 200ms", "no new runtime dependencies").
• Conventions — naming, error handling, file layout, test expectations.
• Open questions — anything deliberately deferred, so future you does not mistake a gap for a decision.

A useful prompt to end on: "Summarise this session as a decision record with Decisions, Rejected options, Constraints, Conventions, and Open questions. Keep each item to one line. No prose." The terseness is the point — this artefact gets re-read often, so it has to be scannable.

How do you get that record into Cursor?

There are three workable levels, in increasing order of how little they ask of you.

1. Manual file. Paste the record into a DECISIONS.md at the repo root and commit it. Cursor indexes repo files, so the record becomes part of the context it can pull into edits, and your teammates and future you get it for free. Crude, but it works and it survives the chat being closed.
2. Pinned editor context. Open that file (or paste the record) into Cursor's chat at the start of the implementation session and tell it explicitly: "These constraints are binding for this task." This keeps the record in the active context window rather than relying on retrieval.
3. A shared memory layer. Connect both Claude and Cursor to a memory layer that captures the design session and surfaces the relevant decisions automatically when you start coding. No file to maintain, no re-paste, and it also covers the reverse direction — implementation discoveries flowing back so the next design session is not stale.

Most builders end up combining levels one and three: a committed DECISIONS.md for the canonical, reviewable record, plus a memory layer so the day-to-day handoff does not depend on remembering to re-paste anything. The deeper case for not relying on copy-paste is in Stop re-explaining your project to AI.

A concrete two-day workflow

Here is the loop in practice, with a real-feeling example.

• Day 1, Claude. You design a webhook ingestion service. You decide on idempotency keys, reject a queue-based approach as overkill for the volume, and set a constraint that retries must be safe to replay. You end the session with the decision record prompt above.
• End of Day 1. The record lands in DECISIONS.md and is captured by the memory layer both tools connect to.
• Day 2, Cursor. You open the editor to implement. Cursor already has the decisions in context — it scaffolds the handler with idempotency keys, does not suggest a queue, and writes replay-safe retries because the constraint travelled with you.
• Day 2, mid-implementation. You discover the upstream sends duplicate IDs, so you tighten the dedup logic. That is a new decision. You add one line to DECISIONS.md (or let the memory layer capture it) so the next Claude session is not working from a stale plan.

The discipline that makes this work is small: decisions are written once, immediately, in a place that outlives the chat — and they flow both ways, not just from design to code.

How does Vilix fit into this?

Vilix is the shared-memory-layer option. It connects to Claude and Cursor — plus ChatGPT, Perplexity, Gemini, and any MCP-compatible tool — through a single one-time OAuth MCP connection, captures full conversation context, and retrieves the relevant decisions and constraints semantically when you switch tools. It does not replace a committed DECISIONS.md, and it does not stop you using Cursor's own workspace context; it removes the manual re-paste step between them. You can export or delete everything it stores at any time. If the Claude-to-Cursor handoff is a daily tax for you, you can try Vilix free for 7 days and see whether the constraints actually survive the switch in your own work.

Frequently asked questions

Can Cursor read my Claude conversations directly?

No. Cursor and Claude are separate products with no shared storage. Cursor can only see your repo files and what you put in its chat. Carrying context across requires an external artefact — a committed file or a shared memory layer both tools connect to.

Isn't a DECISIONS.md file enough on its own?

It is genuinely good and worth doing regardless. Its limits are that it depends on you remembering to update it and re-open it, it only carries what you manually distilled, and it does not capture the reasoning that did not make it into the file. A memory layer automates the capture and retrieval; the file stays valuable as the reviewable, canonical record.

Should I just do all the design inside Cursor instead?

You can, and for small changes that avoids the handoff entirely. Many builders still prefer Claude for open-ended design and architecture discussion and Cursor for in-editor implementation. The point of this workflow is to let you use the best tool for each phase without paying for the switch.

Does this work in the Cursor-to-Claude direction too?

Yes, and it matters. Implementation surfaces facts the design did not anticipate. Recording those discoveries — in the file or via a memory layer — keeps the next Claude session grounded in the real state of the code instead of the original plan.

What should never go in the decision record?

Transcripts, dead ends you already abandoned, and anything that will change every commit. The record is for durable decisions, constraints, and conventions. Keep it short enough that re-reading it costs seconds, not minutes.