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How to find logic bugs in a codebase, worst first with Perch

Run one scan to list semantic defects in your code, ranked by severity and confidence.

Who it is forA developer who suspects a codebase has wrong-order, off-by-one, or null-handling bugs and wants a ranked list to start with.

The problemStandard linters miss many meaning-level bugs, so problems can stay hidden until they reach production.

The outcomeA ranked list of findings with file, line, problem type, and confidence, sorted so the worst appear first.

What you need first

  • Node.js with npm, to install the @lakeday/perch package
  • A Perch Cloud account, created by running perch login (the first $5 is free)
  • A project folder with source code to scan

Steps

  1. Run npm install -g @lakeday/perch
  2. Run perch login to sign in to Perch Cloud
  3. Run perch scan in the project folder
  4. Run perch issues to see the findings worst first
  5. Run perch issues <id> with a finding ID to view one finding in detail (inferred, check the README)

Prompt for your agent

In the perch repo at <project path>, run `perch scan` and then `perch issues`. Report the top five findings with file, line, and problem type. Verify that the output lists problems with IDs and a severity for each.

Caveat. Scans run through Perch Cloud after sign-in, and the README says the first $5 is free, so later scans may cost money.

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