chore: Move to AGENTS.md file with agent instructions

[DawidMyslak]

Summary

AGENTS.md spec: https://agents.md

This is helpful for Cursor editor, Codex and possibly other AI related coding tools.

Slack discussion thread: https://n8nio.slack.com/archives/C03MZF137FV/p1763976444748689

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/N8N-9252/introduce-agentsmd-files

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[bundlemon]

BundleMon

Unchanged files (2)

Status	Path	Size	Limits
✅	WASM Dependencies tree-sitter-bash.wasm	181.26KB	-
✅	WASM Dependencies tree-sitter.wasm	74.47KB	-

No change in files bundle size

Groups updated (2)

Status	Path	Size	Limits
✅	**/*.js	11.38MB (+94.45KB +0.82%)	-
✅	**/*.css	231.53KB (+10.76KB +4.87%)	-

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[cubic-dev-ai]

3 issues found across 6 files

Prompt for AI agents (all 3 issues)

Understand the root cause of the following 3 issues and fix them.


<file name="packages/testing/playwright/AGENTS.md">

<violation number="1" location="packages/testing/playwright/AGENTS.md:5">
The documented pnpm command omits the `--` separator, so `--reporter`/`--grep` are eaten by pnpm instead of Playwright and the command fails. Include `--` before the Playwright flags so the example actually works.</violation>
</file>

<file name="AGENTS.md">

<violation number="1" location="AGENTS.md:123">
Update the CSS guidance to point to the actual `packages/frontend/AGENTS.md` file so readers can find the referenced instructions.</violation>

<violation number="2" location="AGENTS.md:145">
Refer to an existing backend-module guide (or remove the reference) instead of the non-existent `@packages/cli/.../backend-module.guide.md` path.</violation>
</file>

_{Reply to cubic to teach it or ask questions. Re-run a review with @cubic-dev-ai review this PR}

[currents-bot]

✅

E2E Tests: n8n tests passed after 8m 48.5s

🟢 588 · 🔴 0 · ⚪️ 12 · 🟣 5

View Run Details

Run Details

• Project: n8n

• Groups: 2

• Framework: Playwright

• Run Status: Passed

• Commit: 1333fb3

• Spec files: 96

• Overall tests: 600

• Duration: 8m 48.5s

• Parallelization: 9

Groups

GroupId	Results	Spec Files Progress
ui	🟢 539 · 🔴 0 · ⚪️ 12 · 🟣 5	90 / 90
ui:isolated	🟢 49 · 🔴 0 · ⚪️ 0	6 / 6

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