Cursor vs Claude Code: What I Actually Use to Ship SaaS

The interesting question is not which model is smarter this month. Feature matrices age in weeks. The useful question is which harness matches the job in front of you: an IDE that wants you to review diffs, or a terminal agent that wants to loop until the tests pass.

I build AgenticKit for Cursor. That is a bias, and I will keep it on the table. This is not a bake-off with invented scores. It is a job-based comparison of two shapes, plus what breaks when you run both without a shared project brain.

The takeaway

Cursor is the home tool for the work AgenticKit is built around: reviewable, file-local, convention-heavy SaaS. Claude Code is a strong shape for long unattended terminal loops. Using both without a shared AGENTS.md or CURSOR.md splits the project's memory in half.

Pick by job, not by hype.

Bias, stated

AgenticKit installs files into .cursor/agents, .cursor/rules, .cursor/commands, and a sessionStart hook that refreshes CURSOR.md. That packaging only exists because the daily driver is Cursor. I am not a neutral reviewer who split a year evenly across both tools.

What I can say from first-hand work:

• Shipping this product is mostly reading diffs, enforcing globs, and running slash commands in an editor.
• The kit is Cursor-shaped on purpose: glob-scoped rules, visual review, commands next to the files they change.

What I will not say:

• That one tool produces "better code" in the abstract
• Any token, latency, or quality score I did not measure

The rest of this piece uses documented product differences and a public consensus I will label as such. Practitioners on HN and in long-form posts keep landing on the same split: once you plan clearly, code quality converges; the remaining difference is parallel exploration versus focused review. Treat that as a synthesis of other people's weeks, not a lab result from this repo.

Two harnesses, not two models

Both tools will run Claude, GPT, or whatever is wired this quarter. The harness is the part that lasts.

Cursor is an editor with an agent inside it. You see the file tree, the diff, the browser preview, the terminal. Rules can attach by glob. You approve or reject in the same place you type. Plan Mode (Shift+Tab) researches, asks, and waits.

Claude Code is an agent with a terminal around it. You give an outcome. It edits, runs, and loops. That is a good shape when you want to leave a well-specified job running. It is a worse shape when the job is "does this settings page look like the rest of the app."

If you argue about models, you will re-litigate this every release. If you argue about harness, the answer is stable enough to build a workflow on.

A week of SaaS work, mapped

None of those rows say "always." They say where I start.

What ports, and what does not

The portable floor is AGENTS.md: setup commands, how to run tests, PR title format. Cursor reads it. Claude Code reads CLAUDE.md and, in current setups, will also honor an AGENTS.md in many projects. Put the boring truth there so you are not maintaining two novels.

Cursor-specific, and worth keeping that way:

• .cursor/rules/*.mdc with globs and alwaysApply
• .cursor/commands/*.md slash commands
• .cursor/hooks.json (AgenticKit uses sessionStart to sync CURSOR.md)

Claude-specific:

• .claude/commands/
• CLAUDE.md conventions and permission prompts

A dual-tool workflow that works: one AGENTS.md + one CURSOR.md for product truth, then thin native files on each side that say "read those two files first." A dual-tool workflow that fails: a 400-line Cursor rule dump and a different 400-line CLAUDE.md that disagree about the ORM.

What breaks when you dual-wield

Context splits. You teach Cursor that errors need a code field. You forget to teach Claude Code. Half the routes have it.

Review splits. The terminal agent commits. You never saw the empty state. The IDE agent paints the empty state and never ran the tenant test.

Permission splits. Claude Code will ask to run a command. Cursor will run the one in CURSOR.md if the rule says so. You end up with two ideas of what "test" means (npm vs pnpm).

I would rather be slightly slower in one harness than fast in two that do not share a brain. Building AgenticKit is the longer version of that choice.

When I would pick Claude Code first

• A well-specified, test-backed loop I do not need to watch (generate fixtures, migrate a folder of tests, apply a mechanical lint)
• A machine where I want an agent and I do not want to open an IDE
• A repo I am reading, not shipping, and I want the agent to run find and grep for twenty minutes

Those are real jobs. They are not the job AgenticKit is for.

When Cursor is the wrong tool

Cursor is the wrong tool if you refuse to read diffs. The harness assumes a human in the review seat. If you want to merge whatever comes back, a terminal loop plus CI is more honest, because at least the tests are the reviewer.

Cursor is also the wrong tool for work that is not a repo: a spreadsheet of pricing, a Figma-only exploration, a customer interview. Do not open the editor to avoid talking to a user.

If Cursor is your home, stop collecting comparison tabs. Put a real team in .cursor/ and give it a living CURSOR.md. The install docs are the unglamorous version of that. The shipping workflow is what you run after.