[lengau]

This PR introduces the test-pr agent skill in .github/skills/test-pr/ to automate downstream CI integration testing across all team repositories.

Downstream Test PRs

Repository	Draft PR	Test Workflow Runs
canonical/charmcraft	#2954	Check policy, QA, Check policy, QA, Running Copilot Code Review, Schema, Check policy, QA
canonical/craft-application	#1226	Copilot Setup Steps, Check policy, QA, QA, Check policy, Running Copilot Code Review, QA, Spread, Check policy
canonical/craft-archives	#266	Check policy, QA, Check policy, QA, Running Copilot Code Review, QA, Check policy
canonical/craft-cli	#503	QA, Check policy, Check policy, QA, QA, Check policy, Running Copilot Code Review, QA, Check policy
canonical/craft-grammar	#224	Check policy, QA, Check policy, QA, Running Copilot Code Review, QA, Check policy
canonical/craft-parts	#1771	Check policy, QA, QA, Check policy, Running Copilot Code Review, Check policy, QA
canonical/craft-platforms	#281	QA, Check policy, Security scan, Running Copilot Code Review, QA, Check policy, Security scan
canonical/craft-providers	#1025	Check policy, QA, weekly-tests, Running Copilot Code Review, weekly-tests, QA, Check policy
canonical/craft-store	#443	Check policy, QA, Running Copilot Code Review, QA, Check policy
canonical/debcraft	#207	Check policy, QA, Running Copilot Code Review, Schema, QA, Check policy
canonical/fetch-service	#667	Sync to Launchpad, Security scan, Running Copilot Code Review, Tests, cla-check, Security scan, Sync to Launchpad
canonical/imagecraft	#500	Check policy, QA, Running Copilot Code Review, Check policy, Run a spread test of the generated snap, Snap, QA
canonical/pydantic-kitbash	#181	QA, Check policy, Running Copilot Code Review, Zizmor, QA, Check policy
canonical/rockcraft	#1390	Check policy, QA, Pull Request Labeler, Running Copilot Code Review, Check policy, QA, Spread tests for source, Spread (manual - large/flaky), Schema, Pull Request Labeler
canonical/snapcraft	#6496	Running Copilot Code Review, Check policy, QA
canonical/starbase	#634	Copilot Setup Steps, Running Copilot Code Review, Check policy, QA

[Copilot]

🟡 Changes recommended

Moderate issues remain in JSON output, fork/PR ref handling, discovery parsing, cleanup, and workflow-run selection.

4 open findings

• Paginated API output is parsed line by line · New
• Fork PR owner is incorrectly forced to canonical · New
• --pr uses checkout branch instead of PR head ref · New
• Progress output makes --json stdout invalid · New

What changed in this PR

Adds the test-pr skill and helper script for downstream repository integration testing.

Changes:

• Discovers downstream repositories and rewrites workflow references.
• Creates draft test PRs and reports workflow runs.
• Supports cleanup, dry-run modes, and documented usage.

File	Description
.github/​skills/​test-pr/​test-downstream.py	Implements downstream testing automation.
.github/​skills/​test-pr/​SKILL.md	Documents the skill, prerequisites, and commands.

🧠 Review effort: Lite

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[mr-cal]

What do you think about retrieving the results of the jobs and putting them in the table?

For example, if I update the policy workflow, I'd like to see that all policy workflows pass in the table, without having to open a dozen or more workflows. If it only fails on 1 or 2 repos, it's quicker to know exactly which workflow logs to load.

[lengau]

@mr-cal I agree - I need to break it into separate steps though, as it was originally waiting for CI to complete before even making the table.