From ce409db28ea515b55eb4237288fff2eb5fef2152 Mon Sep 17 00:00:00 2001
From: Peter Dave Hello <hsu@peterdavehello.org>
Date: Sat, 27 Jun 2026 22:22:45 +0800
Subject: [PATCH] Add auto PR Agent reviews with trusted manual triggers

Run describe, review, and improve as parallel auto jobs so PRs get
earlier summaries, feedback, and suggested fixes.

Allow trusted contributors to invoke slash commands on open PRs,
including forks, while repeatable commands replace stale runs.

Suppress persistent review update notices so reruns refresh the
review without adding extra bot comments.

Set the PR Agent GitHub Action image to 0.38.0-github_action by
tag and digest.

Use gpt-5.4-mini xhigh for cost balance and cap LLM calls at 10
minutes inside 60-minute jobs.
---
 .github/workflows/pr-agent.yml | 93 ++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 .github/workflows/pr-agent.yml

diff --git a/.github/workflows/pr-agent.yml b/.github/workflows/pr-agent.yml
new file mode 100644
index 00000000..2241acc0
--- /dev/null
+++ b/.github/workflows/pr-agent.yml
@@ -0,0 +1,93 @@
+name: PR Agent
+
+on:
+  pull_request:
+    branches: ["master"]
+    types: [opened, reopened, ready_for_review, review_requested, synchronize]
+  issue_comment:
+    types: [created]
+
+concurrency:
+  # PR events group by PR so newer pushes replace stale auto runs.
+  # issue_comment events use run_id here; manual commands are grouped below.
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event_name == 'pull_request' && github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  OPENAI_KEY: ${{ secrets.OPENAI_KEY }}
+  config.model: "gpt-5.4-mini"
+  config.reasoning_effort: "xhigh"
+  config.ai_timeout: "600"
+  pr_reviewer.final_update_message: "false"
+  pr_code_suggestions.commitable_code_suggestions: "true"
+  github_action_config.pr_actions: '["opened", "reopened", "ready_for_review", "review_requested", "synchronize"]'
+
+jobs:
+  auto:
+    if: >-
+      github.event_name == 'pull_request' &&
+      github.event.sender.type != 'Bot' &&
+      github.event.pull_request.draft == false &&
+      github.event.pull_request.head.repo.full_name == github.repository
+    runs-on: ubuntu-latest
+    permissions: &pr-agent-permissions
+      contents: read
+      issues: write
+      pull-requests: write
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - tool: describe
+            auto_describe: "true"
+            auto_review: "false"
+            auto_improve: "false"
+          - tool: review
+            auto_describe: "false"
+            auto_review: "true"
+            auto_improve: "false"
+          - tool: improve
+            auto_describe: "false"
+            auto_review: "false"
+            auto_improve: "true"
+
+    steps:
+      - name: Run PR Agent ${{ matrix.tool }}
+        uses: &pr-agent-image docker://pragent/pr-agent:0.38.0-github_action@sha256:ea2ea90f072fd97708755e59827a317272f66097a1ef349eca23d39160bb0baf
+        env:
+          github_action_config.auto_review: ${{ matrix.auto_review }}
+          github_action_config.auto_describe: ${{ matrix.auto_describe }}
+          github_action_config.auto_improve: ${{ matrix.auto_improve }}
+
+  manual:
+    if: >-
+      github.event_name == 'issue_comment' &&
+      github.event.sender.type != 'Bot' &&
+      github.event.issue.pull_request != null &&
+      github.event.issue.state == 'open' &&
+      contains(fromJSON('["OWNER", "MEMBER", "COLLABORATOR", "CONTRIBUTOR"]'), github.event.comment.author_association) &&
+      (
+        contains(fromJSON('["/review", "/describe", "/improve", "/ask"]'), github.event.comment.body) ||
+        startsWith(github.event.comment.body, '/review ') ||
+        startsWith(github.event.comment.body, fromJSON('"/review\n"')) ||
+        startsWith(github.event.comment.body, '/describe ') ||
+        startsWith(github.event.comment.body, fromJSON('"/describe\n"')) ||
+        startsWith(github.event.comment.body, '/improve ') ||
+        startsWith(github.event.comment.body, fromJSON('"/improve\n"')) ||
+        startsWith(github.event.comment.body, '/ask ') ||
+        startsWith(github.event.comment.body, fromJSON('"/ask\n"'))
+      )
+    runs-on: ubuntu-latest
+    permissions: *pr-agent-permissions
+    timeout-minutes: 60
+    concurrency:
+      # The job if gate validates exact command forms; keep these prefixes aligned.
+      # Regenerating command reruns supersede older same-command runs; /ask is per-comment.
+      group: ${{ github.workflow }}-manual-${{ github.event.issue.number }}-${{ startsWith(github.event.comment.body, '/ask') && github.event.comment.id || startsWith(github.event.comment.body, '/review') && 'review' || startsWith(github.event.comment.body, '/describe') && 'describe' || startsWith(github.event.comment.body, '/improve') && 'improve' || github.event.comment.id }}
+      cancel-in-progress: true
+
+    steps:
+      - name: Run PR Agent command
+        uses: *pr-agent-image