Browser-only developer utility
AI Coding Agent Instruction File Checker
Audit an AGENTS.md, CLAUDE.md, Copilot instruction file, or Cursor project rule for compatibility, executable setup, verification, scope, safety, and maintainability.
Free browser tool
Audit your instruction file
Your content stays in your browser. The checker makes no network request and stores no instruction text.
- Documented file-path compatibility
- Setup and verification commands
- Scope and nested-rule guidance
- Secret, placeholder, and destructive-command risks
- Structure and tool-size guidance
Results are recommendations, not proof that a tool will execute every instruction correctly.
Direct answer
A useful instruction file names its scope and exact setup and verification commands. It also defines safety boundaries and completion expectations.
This checker scores those visible signals and verifies the selected file path against a dated product-and-environment matrix. It does not use AI or send your text to a server.
How the score works
The score starts at 100 and applies fixed deductions across compatibility, operability, scope, safety, verification, and maintainability. A secret-shaped value or unconditional destructive command creates an error; missing commands, unclear scope, placeholders, and oversized files create targeted warnings. The same input always returns the same result.
What it can catch
Missing repository commands, weak scope, unsupported paths, unresolved placeholders, secret patterns, hidden bidirectional text, conflicting package managers, invalid Cursor frontmatter, and dangerous shell or Git instructions.
What still needs review
Whether commands are accurate, permissions match your threat model, nested files conflict, and the chosen agent follows every rule in practice.
Compare, download, and verify
Choose the right file
Surface support differs across Codex, Claude Code, Copilot, and Cursor.
Compare instruction files by tool and surfaceStart from a maintained template
Replace every example command with one that exists in your repository.
Download the AGENTS.md templateDownload the CLAUDE.md templateUse the structured data
Review or reuse the compatibility records with their current verification date.
Open compatibility JSONOpen compatibility CSVOfficial evidence
Path compatibility was checked against first-party publisher documentation on Jul 14, 2026. Product support can change; recheck the source before a migration.