AGENTS.md vs Cursor Rules
AGENTS.md vs Cursor Rules: side-by-side comparison of two file-backed / editor paradigms systems — architecture, taxonomy, license, pricing, MCP/A2A support, and direct edges.
Cost & capability
| AGENTS.md | Cursor Rules | |
|---|---|---|
| Use cases | Code Generation Focused, Scoped Agentic | Code Generation Focused, Scoped Agentic, Analytical Summarization |
Where they differ (4)
Rows where both sides have data and the values disagree — the shortlist of dimensions that actually distinguish these two systems.
| AGENTS.md | Cursor Rules | |
|---|---|---|
| Use cases | Code Generation Focused, Scoped Agentic | Code Generation Focused, Scoped Agentic, Analytical Summarization |
| Type | Cross-tool open standard | IDE-embedded code memory |
| Created | 2025-05 (introduced with OpenAI Codex CLI research preview May 16 2025; donated to Linux Foundation AAIF Dec 2025) | 2023-03 (Cursor launched March 2023; .cursorrules file supported from initial release) |
| Backend storage | file (AGENTS.md) | file (.cursor/rules/) |
At a glance
| AGENTS.md | Cursor Rules | |
|---|---|---|
| Section | File-backed / editor paradigms | File-backed / editor paradigms |
| Tier | T1 | T1 |
| Type | Cross-tool open standard | IDE-embedded code memory |
| Created | 2025-05 (introduced with OpenAI Codex CLI research preview May 16 2025; donated to Linux Foundation AAIF Dec 2025) | 2023-03 (Cursor launched March 2023; .cursorrules file supported from initial release) |
| Backend storage | file (AGENTS.md) | file (.cursor/rules/) |
| Multi-tenancy | — | Multi-tenant AWS with logical segregation; separate tenants for privacy vs non-privacy modes; no dedicated single-tenant offering |
| Optimised for | simplicity / git-versioned / human-readable | simplicity / git-versioned / human-readable |
| Anti-fit | not for non-coding / non-IDE use cases | not for non-coding / non-IDE use cases |
Taxonomy
| Axis | AGENTS.md | Cursor Rules |
|---|---|---|
| storage | file | file |
| retrieval | injection | injection |
| persistence | cross-session | cross-session |
| update | overwrite | overwrite |
| unit | document | document |
| governance | user-controllable | user-controllable |
| conflict | manual | n/a |
Pros & cons
AGENTS.md
Pros: Cross-vendor convention — the closest thing to a universal agent memory file format; works across Claude Code, Cursor, and Codex CLI.
Cons: Adoption is informal (no spec authority); agent-by-agent interpretation differences mean behavior isn't fully portable.
Cursor Rules
Pros: Rule-file format integrated directly into the IDE that 35M+ developers use; specific selectors (file globs) make rules precise.
Cons: Cursor-only — no portability to Claude Code or other agents; rules can quietly conflict and produce confusing agent behavior.