Increase PR size thresholds to accommodate AI-assisted development

[osterman]

what

Updated PR size tier thresholds to better reflect modern AI-assisted development:

• Medium: 500 → 1,000 lines
• Large: 1,000 → 5,000 lines
• Extra Large: new tier (5,001–10,000 lines)
• Extra Extra Large: new tier (>10,000 lines, triggers warning)

why

Previously, any PR >1,000 lines triggered a Mergify warning. With Claude-assisted development, PRs naturally grow while remaining focused on single, logical changes. The new thresholds reflect this reality: PRs under a few thousand lines are ideal, only those exceeding 10,000 are flagged as too large and should be split into smaller PRs.

changes

• Added xl_max_size and xxl_label inputs to PR size action
• Updated workflow to use new threshold values (1,000/5,000/10,000)
• Migrated Mergify warning from size/xl to size/xxl (>10,000 lines)
• Documented guidelines in CLAUDE.md for Claude agents

Summary by CodeRabbit

• New Features

  • Added XXL size label category for pull requests exceeding 10,000 lines of changes.
  • Introduced optional CI/CD failure when XXL-sized PRs are detected.

• Chores

  • Updated Medium and Large PR size thresholds (Medium: 500→1,000 lines; Large: 1,000→5,000 lines).
  • Adjusted automated review warning message to reflect higher recommended PR size limit.

[mergify]

Important

Cloud Posse Engineering Team Review Required

This pull request modifies files that require Cloud Posse's review. Please be patient, and a core maintainer will review your changes.

To expedite this process, reach out to us on Slack in the #pr-reviews channel.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Files

None

[coderabbitai]

📝 Walkthrough

Walkthrough

Extends the PR size-labeling system to support XXL category by increasing size thresholds, adding XXL-specific configuration options to the pr-sizer action, and updating Mergify rules to comment on XXL-labeled PRs with adjusted sizing guidance.

Changes

Cohort / File(s)	Summary
PR Sizer Action .github/actions/pr-sizer/action.yml	Adds XXL sizing support with new inputs (xl_max_size, xxl_label, fail_if_xxl), extends label-determination logic to handle XXL category, includes xxl_label in label aggregation, and optionally fails when XXL threshold is exceeded.
PR Size Labeler Workflow .github/workflows/pr-size-labeler.yml	Increases thresholds: m_max_size (500→1000), l_max_size (1000→5000); adds xl_max_size: 10000, xxl_label, and fail_if_xxl inputs; adds go.sum to ignored files.
Mergify Automation .github/mergify.yml	Shifts PR comment trigger from size/xl to size/xxl label and updates warning message threshold from 1,000 to 10,000 lines.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• fix: resolve Docker Hub rate limit issues in GitHub Actions #1511: Directly modifies the same pr-sizer action and workflow inputs for size-labeling functionality.
• Use Mergify for PR Size Comments #1099: Updates both mergify.yml rules and pr-size-labeler workflow configuration for PR size handling.
• fix: Move PR size labeler to dedicated workflow #1816: Modifies pr-sizer action configuration and related workflow definitions.

Suggested labels

no-release

Suggested reviewers

• aknysh

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: increasing PR size thresholds to support AI-assisted development workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch osterman/pr-size-recommendations

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

🧹 Nitpick comments (1)

.github/actions/pr-sizer/action.yml (1)

206-214: Minor observation: identical error messages.

Both XL and XXL failures use the same message. Consider differentiating them (e.g., mentioning the threshold exceeded) for easier debugging. Not blocking.

💡 Optional: differentiate error messages

          // Fail if XL and configured to do so
          if (newLabel === xl_label && fail_if_xl) {
-           core.setFailed(`PR is too large (${totalChanges} changes). Please consider breaking it up into smaller PRs.`);
+           core.setFailed(`PR exceeds XL threshold (${totalChanges} changes, limit ${xl_max_size}). Please consider breaking it up into smaller PRs.`);
          }

          // Fail if XXL and configured to do so
          if (newLabel === xxl_label && fail_if_xxl) {
-           core.setFailed(`PR is too large (${totalChanges} changes). Please consider breaking it up into smaller PRs.`);
+           core.setFailed(`PR exceeds XXL threshold (${totalChanges} changes, limit ${xl_max_size}). Please consider breaking it up into smaller PRs.`);
          }

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In @.github/actions/pr-sizer/action.yml around lines 206 - 214, The two
core.setFailed calls for XL and XXL use identical messages; update them to
include the label/threshold so failures are distinguishable: when newLabel ===
xl_label && fail_if_xl, call core.setFailed with a message that mentions
xl_label and the XL threshold (e.g., "PR is too large (XL threshold: X changes,
actual: ${totalChanges})."), and when newLabel === xxl_label && fail_if_xxl,
call core.setFailed with a message that mentions xxl_label and the XXL threshold
similarly; use the existing variables (newLabel, xl_label, xxl_label,
fail_if_xl, fail_if_xxl, totalChanges) to build the distinct messages.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In @.github/actions/pr-sizer/action.yml:
- Around line 206-214: The two core.setFailed calls for XL and XXL use identical
messages; update them to include the label/threshold so failures are
distinguishable: when newLabel === xl_label && fail_if_xl, call core.setFailed
with a message that mentions xl_label and the XL threshold (e.g., "PR is too
large (XL threshold: X changes, actual: ${totalChanges})."), and when newLabel
=== xxl_label && fail_if_xxl, call core.setFailed with a message that mentions
xxl_label and the XXL threshold similarly; use the existing variables (newLabel,
xl_label, xxl_label, fail_if_xl, fail_if_xxl, totalChanges) to build the
distinct messages.

---

ℹ️ Review info

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Disabled knowledge base sources:

• Linear integration is disabled

You can enable these sources in your CodeRabbit configuration.

📥 Commits

Reviewing files that changed from the base of the PR and between 4f0f243 and 98135a0.

📒 Files selected for processing (3)

• .github/actions/pr-sizer/action.yml
• .github/mergify.yml
• .github/workflows/pr-size-labeler.yml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.58%. Comparing base (8cd0056) to head (405d94e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2136   +/-   ##
=======================================
  Coverage   76.57%   76.58%           
=======================================
  Files         832      832           
  Lines       79500    79500           
=======================================
+ Hits        60879    60885    +6     
+ Misses      14822    14817    -5     
+ Partials     3799     3798    -1     

Flag	Coverage Δ
unittests	76.58% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 3 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

These changes were released in v1.208.1-test.0.

[github-actions]

These changes were released in v1.208.1-test.9.

[github-actions]

These changes were released in v1.208.1-test.10.