Perch / Examples

Examples

Catch regressions, enforce project rules, and check the code and documentation your agent changes.

Behavior-driven development

Keep your coding agent from undoing your fixes

Save the requirement as a rule. Check later edits for the bug you already fixed.

Scan types

Choose defect, security, and saved-rule checks when reviewing generated code, then inspect the agent's changes against a base commit.

Defects

Scan generated code for broken behavior, then check the fix before committing.

Security

Require an ownership check and recheck it after the agent changes the handler.

Security

Check that private routes still require authentication and records still require permission.

Behavior-driven development

Require the same validation after a rewrite, even when the generated code takes a different approach.

Documentation

Catch vague headings, filler paragraphs, and examples with no output before the agent finishes.

Code comments

Check the promises in an agent’s comments against return values, errors, and side effects.

Behavior-driven development

Run Perch against working files, save a named rule in perch.yaml, configure Claude Code, Codex or Cursor, and repeat the same check after a repair.