CodeMate comparison for named English verification rules

Catch the fix an agent removes later.

A saved requirement makes a recurring mistake checkable. In this Perch capture from September 20, 2026, the same rule flags a missing guard and passes after the guard is restored.

def refund(order, payment):
    payment.refund(order.total)
    order.status = "refunded"
    return order

def refund(order, payment):
    if order.status == "refunded":
        return order
    payment.refund(order.total)
    order.status = "refunded"
    return order

Source: public order-service checkout.py at the linked commit. The captured standalone file is refund.py. Perch command output and timestamp. This saved-rule demonstration does not measure CodeMate's detection rate.

Perch vs CodeMate: what your team runs.

Perch turns project behavior into focused checks that agents can run before committing. Use these differences to choose the review workflow and billing model your team needs.

CodeMate comparison for named English verification rules

Perch gives a review requirement its own runnable command. Save the English statement in the repository, choose the affected method or file, and check the agent's work before committing. Fresh-check pricing and free cached answers keep repeated verification explicit.

Review before committing

CodeMate: CLI and IDE surfaces, with PR review commands. CodeMate workflow documentation.

Perch reads the current working file with perch check. For a known requirement, select its rule name and method instead of requesting another broad review. A local CLI describes where the command runs; Perch sends relevant source to hosted TypeSafe models for analysis.

How do saved requirements differ?

CodeMate: Custom guidelines and review commands. CodeMate rule documentation.

Perch stores English ensure rules in perch.yaml or .perch/rules/. Project, file and method scopes determine what is checked. Run the named check after an edit and after the repair; a rule finding can fail the command and a CI gate. Perch rules · Working-file checks.

What does the review bill depend on?

Compare CodeMate's billing unit and Perch's usage estimate

Is the CLI open source and offline?

CodeMate: Commercial coding-assistant service. CodeMate product or license source.

Perch’s CLI is MIT-licensed; hosted model inference is a separate paid service included in its published check rate. It does not run the model offline. Unchanged requests can reuse cached answers for free. Fresh judgments can vary, and a passing requirement check does not prove application correctness. Perch MIT license.

When does CodeMate fit the workflow?

CodeMate spans CLI, IDE, review and implementation workflows. A displayed coding-platform plan does not establish the cost of every review-agent workload; compare the actual product entitlement.

Estimate the review bill

Perch and CodeMate: pricing, allowances and workload calculator

Make the agent check its next edit.

npm install -g @lakeday/perch

perch rules add refund-once \
  --where refund.py --each method \
  --ensure "Refunded orders cannot be refunded again."

perch check refund.py::refund --rules refund-once

Use perch scan for repository code at Git HEAD and changed-code CI checks for pull requests. New model judgments can vary. Repeatability comes from cached answers for unchanged requests; a pass does not prove application correctness.