Add AGENTS.md and address-review prompt for non-Claude agents (#708)

Adds Codex/GPT support by including:
- AGENTS.md pointing non-Claude agents to shared prompts
- prompts/address-review.md for PR review triage workflow

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: justin808

AGENTS.md

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+# react-webpack-rails-tutorial
+
+## Project Overview
+
+React on Rails demo app — a Rails application with React, Redux, Tailwind CSS, and server-side rendering via the react_on_rails gem.
+
+- `prompts/`: shared prompt templates for Codex, GPT, and other non-Claude tools
+
+## Working Rules
+
+- When the user asks to address PR review comments, follow `prompts/address-review.md`.

prompts/address-review.md

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+# Address Review Prompt
+
+Use this prompt in Codex CLI, ChatGPT, or another coding assistant when you want the equivalent of Claude Code's `/address-review` workflow.
+
+## How to Use
+
+Paste the prompt below into your coding assistant and replace `{{PR_REFERENCE}}` with one of:
+
+- A PR number, such as `12345`
+- A PR URL, such as `https://github.com/org/repo/pull/12345`
+- A specific review URL, such as `https://github.com/org/repo/pull/12345#pullrequestreview-123456789`
+- A specific issue comment URL, such as `https://github.com/org/repo/pull/12345#issuecomment-123456789`
+
+If the assistant has terminal access with `gh`, it should execute the workflow directly. If it does not, it should stop and ask for the missing GitHub data instead of pretending it fetched comments.
+
+## Prompt
+
+```text
+Act as a pull request review triage assistant.
+
+I want the equivalent of Claude Code's `/address-review` command for this input: `{{PR_REFERENCE}}`.
+
+Your job is to fetch GitHub PR review comments, triage them, and wait for my instruction before making code changes.
+
+Behavior rules:
+- Do not claim you fetched comments unless you actually have terminal or API access and used it.
+- If you do not have shell access with `gh`, say so immediately and ask me to provide either:
+  - the PR URL plus exported comment data, or
+  - the output of the required `gh api` commands.
+- Do not auto-fix everything. Stop after triage and wait for my selection.
+- Default to real issues only, not optional polish.
+- After selected items are addressed, reply to the original GitHub comments and resolve threads when appropriate.
+
+Execution flow when terminal access is available:
+
+1. Determine repository:
+   - Run: `REPO=$(gh repo view --json nameWithOwner -q .nameWithOwner)`
+   - If the input is a full GitHub URL, use the URL's `org/repo`.
+   - If `gh` is unavailable or unauthenticated, stop and tell me to fix that first.
+
+2. Parse the input:
+   - Support:
+     - PR number only
+     - PR URL
+     - Specific review URL with `#pullrequestreview-...`
+     - Specific issue comment URL with `#issuecomment-...`
+   - Extract the PR number and optional review/comment ID.
+
+3. Fetch review data:
+   - Specific issue comment:
+     `gh api repos/${REPO}/issues/comments/{COMMENT_ID} | jq '{body: .body, user: .user.login, html_url: .html_url}'`
+   - Specific review:
+     `gh api repos/${REPO}/pulls/{PR_NUMBER}/reviews/{REVIEW_ID} | jq '{id: .id, body: .body, state: .state, user: .user.login, html_url: .html_url}'`
+     `gh api --paginate repos/${REPO}/pulls/{PR_NUMBER}/reviews/{REVIEW_ID}/comments | jq -s '[.[].[] | {id: .id, node_id: .node_id, path: .path, body: .body, line: .line, start_line: .start_line, user: .user.login, in_reply_to_id: .in_reply_to_id}]'`
+   - Full PR:
+     `gh api --paginate repos/${REPO}/pulls/{PR_NUMBER}/comments | jq -s '[.[].[] | {id: .id, node_id: .node_id, type: "review", path: .path, body: .body, line: .line, start_line: .start_line, user: .user.login, in_reply_to_id: .in_reply_to_id}]'`
+     `gh api --paginate repos/${REPO}/issues/{PR_NUMBER}/comments | jq -s '[.[].[] | {id: .id, node_id: .node_id, type: "issue", body: .body, user: .user.login, html_url: .html_url}]'`
+   - For all review-comment paths, fetch thread metadata and match `thread_id` by `node_id`:
+     `OWNER=${REPO%/*}`
+     `NAME=${REPO#*/}`
+     `gh api graphql --paginate -f owner="${OWNER}" -f name="${NAME}" -F pr={PR_NUMBER} -f query='query($owner:String!, $name:String!, $pr:Int!, $endCursor:String) { repository(owner:$owner, name:$name) { pullRequest(number:$pr) { reviewThreads(first:100, after:$endCursor) { nodes { id isResolved comments(first:100) { nodes { id databaseId } } } pageInfo { hasNextPage endCursor } } } } }' | jq -s '[.[].data.repository.pullRequest.reviewThreads.nodes[] | {thread_id: .id, is_resolved: .isResolved, comments: [.comments.nodes[] | {node_id: .id, id: .databaseId}]}]'`
+
+4. Filter comments:
+   - Skip resolved threads.
+   - Skip replies where `in_reply_to_id` is set.
+   - Keep bot comments by default, but deduplicate duplicates and skip status-only bot posts.
+   - Focus on correctness bugs, regressions, security issues, missing tests that hide bugs, and clear adjacent-code inconsistencies.
+   - Skip style nits, speculative suggestions, documentation nits, changelog wording, duplicate comments, and "could consider" feedback unless I ask for polish work.
+   - If the API returns 404, tell me the PR or comment does not exist.
+   - If the API returns 403, tell me to check `gh auth status`.
+   - If nothing is returned, tell me no review comments were found.
+
+5. Triage every remaining comment:
+   - `MUST-FIX`: correctness bugs, regressions, security issues, missing tests that could hide a bug, and clear inconsistencies with adjacent code that would likely block merge.
+   - `DISCUSS`: reasonable scope-expanding suggestions, architectural opinions, and comments that need a decision.
+   - `SKIPPED`: style preferences, documentation nits, comment requests, test-shape preferences, speculative suggestions, changelog wording, duplicate comments, status posts, summaries, and factually incorrect suggestions.
+   - Deduplicate overlapping comments before classifying them.
+   - Verify reviewer claims locally before calling something `MUST-FIX`.
+   - If a claim is wrong, classify it as `SKIPPED` and say why.
+   - Preserve comment IDs and thread IDs for later replies and thread resolution.
+   - Track only `MUST-FIX` items as your working checklist.
+   - Use one checklist entry per must-fix item or deduplicated issue.
+   - Use the subject format: `"{file}:{line} - {comment_summary} (@{username})"`.
+   - For general comments, extract the must-fix action from the body.
+
+6. Present triage and wait:
+   - Use a single numbering sequence across all categories.
+   - Show counts for `MUST-FIX`, `DISCUSS`, and `SKIPPED`.
+   - Ask which items I want addressed.
+   - If there are skipped or declined discuss items, also ask which ones should receive rationale replies.
+   - Do not edit code yet.
+
+7. After I choose items:
+   - Address the selected items in code, tests, or docs.
+   - Run relevant checks when possible.
+   - Reply to each addressed review comment:
+     - Issue comments: `gh api repos/${REPO}/issues/{PR_NUMBER}/comments -X POST -f body="<response>"`
+     - Review comment replies: `gh api repos/${REPO}/pulls/{PR_NUMBER}/comments/{COMMENT_ID}/replies -X POST -f body="<response>"`
+     - Review summary body replies: `gh api repos/${REPO}/issues/{PR_NUMBER}/comments -X POST -f body="<response>"`
+   - Resolve threads only when the issue is actually handled or explicitly declined with my approval:
+     `gh api graphql -f query='mutation($threadId:ID!) { resolveReviewThread(input:{threadId:$threadId}) { thread { id isResolved } } }' -f threadId="<THREAD_ID>"`
+   - Do not resolve anything still in progress or uncertain.
+
+Output format for the triage:
+
+MUST-FIX (count):
+1. item
+
+DISCUSS (count):
+2. item
+   Reason: short explanation
+
+SKIPPED (count):
+3. item - short reason
+
+Then ask:
+- Which items should I address?
+- Optional: which skipped or declined items should get rationale replies?
+```