feat: implement Git integration for automated repository instruction syncing and commit management

Reviewed-on: #127

.agents/skills/triage-findings/SKILL.md

@@ -0,0 +1,46 @@
+---
+name: triage-findings
+description: Merge code-review findings, sort and renumber them by severity, resolve real issues, and move false positives into exclusions.
+---
+
+# Triage Findings
+
+## When To Use
+
+Use this skill when you receive multiple review findings, screenshots, comments, or issue lists that need to become one final triaged list.
+It is also used when some findings are false positives and should be moved into the exclusions list.
+
+## Workflow
+
+1. Collect all findings into one list.
+2. Merge duplicates into a single finding when they describe the same issue.
+3. Sort the final list by severity:
+   - critical
+   - warning
+   - info
+4. Renumber the sorted list from 1 upward.
+5. Rewrite each finding concisely so the final list reads cleanly and consistently.
+6. If a finding is a false positive, do not keep it in the final list.
+7. Add false positives to the exclusions list as a top-level JSON array in `.gitea/ai-review/exclusions.json`, and preserve the original finding wording as much as possible, including language and semantics. Do not wrap the array in `exclusions` or `excluded_findings`.
+
+## Resolution Flow
+
+After the list is merged and ordered, resolve the remaining findings one by one.
+
+1. Start from the highest severity item.
+2. Identify the root cause in the relevant file or context.
+3. Apply the smallest safe change that fixes the issue.
+4. Add or update tests when behavior changes.
+5. Re-check the issue after the change.
+6. If the item is confirmed false positive, move it to exclusions instead of changing code.
+7. Continue until the list is either fixed or explicitly excluded.
+
+## Output Rules
+
+- Keep the final findings list in severity order, then by any stable secondary order needed to make it readable.
+- Keep numbering contiguous after filtering and merging.
+- Preserve useful details like file path, location, and suggested fix.
+- Keep exclusions entries minimal and consistent with the project schema.
+- When writing exclusions, always output a top-level JSON array.
+- When writing exclusions, prefer the original issue text and language; only paraphrase if needed to fit the schema.
+- If the source already provides a severity or title, keep it unless it conflicts with the final ordering.

.amazonq/skills/triage-findings/SKILL.md

@@ -0,0 +1,41 @@
+# Triage Findings
+
+## When To Use
+
+Use this skill when you receive multiple review findings, screenshots, comments, or issue lists that need to become one final triaged list.
+It is also used when some findings are false positives and should be moved into the exclusions list.
+
+## Workflow
+
+1. Collect all findings into one list.
+2. Merge duplicates into a single finding when they describe the same issue.
+3. Sort the final list by severity:
+   - critical
+   - warning
+   - info
+4. Renumber the sorted list from 1 upward.
+5. Rewrite each finding concisely so the final list reads cleanly and consistently.
+6. If a finding is a false positive, do not keep it in the final list.
+7. Add false positives to the exclusions list as a top-level JSON array in `.gitea/ai-review/exclusions.json`, and preserve the original finding wording as much as possible, including language and semantics. Do not wrap the array in `exclusions` or `excluded_findings`.
+
+## Resolution Flow
+
+After the list is merged and ordered, resolve the remaining findings one by one.
+
+1. Start from the highest severity item.
+2. Identify the root cause in the relevant file or context.
+3. Apply the smallest safe change that fixes the issue.
+4. Add or update tests when behavior changes.
+5. Re-check the issue after the change.
+6. If the item is confirmed false positive, move it to exclusions instead of changing code.
+7. Continue until the list is either fixed or explicitly excluded.
+
+## Output Rules
+
+- Keep the final findings list in severity order, then by any stable secondary order needed to make it readable.
+- Keep numbering contiguous after filtering and merging.
+- Preserve useful details like file path, location, and suggested fix.
+- Keep exclusions entries minimal and consistent with the project schema.
+- When writing exclusions, always output a top-level JSON array.
+- When writing exclusions, prefer the original issue text and language; only paraphrase if needed to fit the schema.
+- If the source already provides a severity or title, keep it unless it conflicts with the final ordering.

.gitea/ai-review/findings.json

@@ -1 +1,9 @@
-[]
+[
+  {
+    "level": "warning",
+    "role": "Leo",
+    "location": "Dockerfile, app/git.js, app/gitea.js",
+    "suggestion": "此變更引入了新的代理（agent）相關路徑（例如 `.agents/` 和 `AGENTS.md`），並在 `Dockerfile` 的 `COPY` 指令、`app/git.js` 中的 `SYNC_PATHS`、`FORCE_SYNC_FILE_PATHS`、`SYNC_TREE_PATHS` 陣列，以及 `app/gitea.js` 的 `filterDiff` 陣列中重複添加了這些路徑。這種模式導致了程式碼重複，每次新增一個代理都需要手動修改多個檔案和多個列表，增加了維護成本和出錯的可能性。建議考慮引入一個集中的設定檔或機制，例如透過掃描特定目錄來動態生成這些路徑列表，以提高模組化和可擴展性。",
+    "is_new": true
+  }
+]

AGENTS.md

@@ -11,3 +11,6 @@ When the task is to triage review findings, follow this workflow:
 7. Add or update tests when behavior changes.
 8. Re-check the issue after each fix.
 
+Use the repo-local `triage-findings` skill for the same workflow when running in Codex.
+
+Trigger it with `/triage-findings`.

Dockerfile

@@ -12,9 +12,11 @@ RUN cd /action/app && npm install
 
 COPY .amazonq/ /action/.amazonq/
 COPY .codex/ /action/.codex/
+COPY .agents/ /action/.agents/
 COPY .claude/ /action/.claude/
 COPY .gemini/ /action/.gemini/
 COPY .github/ /action/.github/
+COPY AGENTS.md /action/
 COPY CLAUDE.md /action/
 COPY GEMINI.md /action/
 

README.md

@@ -22,7 +22,7 @@
 4. 盡量將應用程式放在 ./app，修改 entrypoint.sh 與 Dockerfile 讓程式可以正常運行
 5. 將提示詞放到 ./app/prompts 內供程式讀取
 6. API Key 支援逗號分隔傳入多個，隨機順序各嘗試一次，全部失敗則 exit 1
-7. 讀取 Git Diff 時排除 `.gitea/`、`.amazonq/`、`.antigravity/`、`.claude/`、`.codex/`、`.gemini/`、`.github/` 資料夾，以及 `ANTIGRAVITY.md`、`CLAUDE.md`、`GEMINI.md`、`TODO.md`、`README.md`，避免 AI 分析 workflow 設定、skill 入口與文件等非業務程式碼
+7. 讀取 Git Diff 時排除 `.gitea/`、`.amazonq/`、`.agents/`、`.antigravity/`、`.claude/`、`.codex/`、`.gemini/`、`.github/` 資料夾，以及 `AGENTS.md`、`ANTIGRAVITY.md`、`CLAUDE.md`、`GEMINI.md`、`TODO.md`、`README.md`，避免 AI 分析 workflow 設定、skill 入口與文件等非業務程式碼
 8. 階段七驗證來源分支中的 `findings.json` 與 `exclusions.json` 是否為合法 JSON 格式，格式錯誤時先嘗試透過 AI 修正內容，再重新驗證；修正後仍不合法才 exit 1；之後才檢查檔案是否存在，不存在則建立並寫入 `[]`
 9. 傳給 AI 的 findings 只保留必要欄位（level、role、location、suggestion），排除 `is_new` 等內部欄位；system prompt 精簡為指令核心；exclusions hint 只傳 location 與 suggestion，減少 token 用量
 10. 執行時會額外記錄來源分支狀態、`findings.json` / `exclusions.json` 的檔案路徑、大小、mtime 與 raw/normalized 筆數，方便追查讀檔與分支內容不一致的問題
@@ -243,4 +243,4 @@ Antigravity：直接輸入 `triage-findings 問題原始檔(文字或截圖)`
 
 ### 版本包含
 
-提交時一併包含 `triage-findings` skill 與各平台入口檔；已存在檔案一律覆蓋，同步到最新內容；若 workspace 沒有某個同步檔，記憶區會保留原檔，不做刪除。`findings.json` 與 `exclusions.json` 都從使用此 action 的存取庫來源分支讀取，而不是從 action 本地 workspace 讀取。寫入 `.gitea/ai-review/exclusions.json` 時，盡量保留原始問題文字的語言與語意，避免過度改寫。未來若新增任何 skill 或新增其他平台的 skill 入口，必須同時把對應檔案複製進 Docker image，並把同步清單更新到會使用此 action 的目標專案，避免 action 與目標專案內容脫節。
+提交時一併包含 `triage-findings` skill 與各平台入口檔；其中 `AGENTS.md`、`ANTIGRAVITY.md`、`CLAUDE.md`、`GEMINI.md` 會在目標專案已存在時先做規則化合併，並在可用 LLM 時再用 AI 輔助檢查是否有遺失任何 skill、command 或規則；其餘同步檔則以來源覆蓋；若 workspace 沒有某個同步檔，記憶區會保留原檔，不做刪除。`findings.json` 與 `exclusions.json` 都從使用此 action 的存取庫來源分支讀取，而不是從 action 本地 workspace 讀取。寫入 `.gitea/ai-review/exclusions.json` 時，盡量保留原始問題文字的語言與語意，避免過度改寫。未來若新增任何 skill 或新增其他平台的 skill 入口，必須同時把對應檔案複製進 Docker image，並把同步清單更新到會使用此 action 的目標專案，避免 action 與目標專案內容脫節。

TODO.md

@@ -38,8 +38,8 @@
 - 已驗收：log 已明確顯示 `.gitea/ai-review/findings.json` 與 `.gitea/ai-review/exclusions.json` 都是 `JSON 格式正確`。
 
 ## 階段八：記憶區 commit/push 與錯誤處理
-- 目標：記憶區能成功 commit/push，且一併包含 `triage-findings` skill 與各平台入口檔；skill 檔案已存在時一律以來源覆蓋，workspace 沒有的同步檔則保留記憶區既有內容，不做刪除；錯誤時有明確 log，流程結束有總結訊息。
-- 驗收：log 有「persisted findings」、「commit=...」、「push=...」等訊息，且能看出 skill 相關檔案已一併提交並被來源覆蓋；當 workspace 缺少某個同步檔時，記憶區中的對應檔案不會被刪除；錯誤時有「Runner failed: ...」等明確錯誤說明。
+- 目標：記憶區能成功 commit/push，且一併包含 `triage-findings` skill 與各平台入口檔；`AGENTS.md`、`ANTIGRAVITY.md`、`CLAUDE.md`、`GEMINI.md` 在目標專案已存在時會先做規則化合併，並在可用 LLM 時再做 AI 輔助檢查以避免遺失 skill、command 或規則；其餘同步檔則以來源覆蓋；workspace 沒有的同步檔則保留記憶區既有內容，不做刪除；錯誤時有明確 log，流程結束有總結訊息。
+- 驗收：log 有「persisted findings」、「commit=...」、「push=...」等訊息，且能看出四個入口檔會先規則合併、再由 AI 輔助檢查，其他同步檔會被來源覆蓋；當 workspace 缺少某個同步檔時，記憶區中的對應檔案不會被刪除；錯誤時有「Runner failed: ...」等明確錯誤說明。
 - 已驗收：commit/push 成功時會出現 `persisted findings commit=... push=... review_outcome=...`，且同步規則與缺檔不刪除的行為都有單元測試覆蓋。
 
 ## 階段九：阻擋嚴重問題 PR（第 8 點）

app/git.js

@@ -2,8 +2,8 @@ import { spawnSync } from 'child_process';
 import fs from 'fs';
 import path from 'path';
 import { fileURLToPath } from 'url';
-import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';
-import { line, ok, warn } from './log.js';
+import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH, getLLMConfig } from './config.js';
+import { line, ok, warn, error } from './log.js';
 
 const ACTION_ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
 const GENERATED_SYNC_PATHS = [FINDINGS_PATH, '.gitea/ai-review/exclusions.json'];
@@ -11,6 +11,7 @@ const remoteUrl = `${GITEA_SERVER_URL.replace(/\/$/, '')}/${GITEA_REPOSITORY}.gi
 export const BOT_COMMIT_MARKER = '[ai-review-bot]';
 export const SYNC_PATHS = [
   '.amazonq/rules/triage-findings.md',
+  '.agents/skills/triage-findings/SKILL.md',
   '.antigravity/skills/triage-findings/SKILL.md',
   '.codex/skills/triage-findings/SKILL.md',
   '.codex/skills/triage-findings/agents/openai.yaml',
@@ -18,17 +19,27 @@ export const SYNC_PATHS = [
   '.gemini/skills/triage-findings/SKILL.md',
   '.github/copilot-instructions.md',
   '.github/skills/triage-findings/SKILL.md',
+  'AGENTS.md',
   'ANTIGRAVITY.md',
   'CLAUDE.md',
   'GEMINI.md',
 ];
 const FORCE_SYNC_FILE_PATHS = [
   '.github/copilot-instructions.md',
+  'AGENTS.md',
   'ANTIGRAVITY.md',
   'CLAUDE.md',
   'GEMINI.md',
 ];
+const MERGE_SYNC_FILE_PATHS = new Set([
+  'AGENTS.md',
+  'ANTIGRAVITY.md',
+  'CLAUDE.md',
+  'GEMINI.md',
+]);
+let instructionMergeAssistantPromise = null;
 const SYNC_TREE_PATHS = [
+  '.agents/skills/triage-findings',
   '.antigravity/skills/triage-findings',
   '.codex/skills/triage-findings',
   '.claude/skills/triage-findings',
@@ -66,35 +77,169 @@ function readGitOutput(run, args, cwd, env) {
   }
 }
 
-function copyTree(sourceRoot, repoDir, relDir) {
+function normalizeText(text) {
+  return text.replace(/\r\n/g, '\n');
+}
+
+function splitTextBlocks(text) {
+  const normalized = normalizeText(text).replace(/\n+$/, '');
+  if (!normalized) return [];
+  return normalized.split(/\n{2,}/).map(block => block.trimEnd()).filter(Boolean);
+}
+
+function mergeText(existingText, sourceText) {
+  const existing = normalizeText(existingText);
+  const source = normalizeText(sourceText);
+  if (existing === source) return existing;
+
+  const mergedBlocks = splitTextBlocks(existing);
+  const seenBlocks = new Set(mergedBlocks.map(block => block.trim()));
+  let changed = false;
+
+  for (const block of splitTextBlocks(source)) {
+    const key = block.trim();
+    if (seenBlocks.has(key)) continue;
+    seenBlocks.add(key);
+    mergedBlocks.push(block);
+    changed = true;
+  }
+
+  if (!changed) return existing;
+  return `${mergedBlocks.join('\n\n')}\n`;
+}
+
+function uniqueBlocksFromTexts(...texts) {
+  const seen = new Set();
+  const blocks = [];
+  for (const text of texts) {
+    for (const block of splitTextBlocks(text)) {
+      const key = block.trim();
+      if (!key || seen.has(key)) continue;
+      seen.add(key);
+      blocks.push(block);
+    }
+  }
+  return blocks;
+}
+
+function validateMergedInstructionText(mergedText, requiredBlocks) {
+  const candidate = normalizeText(mergedText);
+  return requiredBlocks.every(block => candidate.includes(normalizeText(block).trim()));
+}
+
+class InstructionMergeError extends Error {
+  constructor(message, options) {
+    super(message, options);
+    this.name = 'InstructionMergeError';
+  }
+}
+
+function abortInstructionMerge(message) {
+  error(message);
+  process.exit(1);
+  throw new InstructionMergeError(message);
+}
+
+function syncFileOverwrite(sourceRoot, repoDir, relPath) {
+  const src = path.join(sourceRoot, relPath);
+  if (!fs.existsSync(src)) return null;
+
+  const dest = path.join(repoDir, relPath);
+  fs.mkdirSync(path.dirname(dest), { recursive: true });
+  fs.copyFileSync(src, dest);
+  return relPath;
+}
+
+async function getInstructionMergeAssistant() {
+  const { provider } = getLLMConfig();
+  if (!provider) return null;
+  if (instructionMergeAssistantPromise) return instructionMergeAssistantPromise;
+
+  instructionMergeAssistantPromise = (async () => {
+    try {
+      const { chatJSON } = await import('./llm.js');
+      return async ({ relPath, existingText, sourceText, deterministicText }) => {
+        const systemPrompt = [
+          'You merge repository instruction files without losing any skill, command, or rule.',
+          'Never delete unique content from either input.',
+          'You may only remove exact duplicates or improve ordering/formatting.',
+          'Return JSON with a single field: merged_text.',
+        ].join(' ');
+        const userContent = JSON.stringify({
+          path: relPath,
+          existing_text: existingText,
+          source_text: sourceText,
+          deterministic_candidate: deterministicText,
+        });
+        const result = await chatJSON(systemPrompt, userContent);
+        if (typeof result === 'string') return result;
+        if (result && typeof result.merged_text === 'string') return result.merged_text;
+        return null;
+      };
+    } catch (e) {
+      warn(`[merge] AI instruction merge unavailable: ${e.message}`);
+      return null;
+    }
+  })();
+
+  return instructionMergeAssistantPromise;
+}
+
+export async function mergeInstructionText(existingText, sourceText, relPath, aiMergeAssistant = null) {
+  const deterministic = mergeText(existingText, sourceText);
+  const requiredBlocks = uniqueBlocksFromTexts(existingText, sourceText);
+  if (!aiMergeAssistant || requiredBlocks.length === 0) return deterministic;
+
+  try {
+    const aiMerged = await aiMergeAssistant({ relPath, existingText, sourceText, deterministicText: deterministic, requiredBlocks });
+    if (typeof aiMerged === 'string' && validateMergedInstructionText(aiMerged, requiredBlocks)) {
+      return normalizeText(aiMerged) === normalizeText(existingText) ? existingText : aiMerged;
+    }
+    abortInstructionMerge(`[merge] ${relPath} AI result rejected; refusing fallback`);
+  } catch (e) {
+    if (e instanceof InstructionMergeError) throw e;
+    abortInstructionMerge(`[merge] ${relPath} AI merge failed: ${e.message}`);
+  }
+}
+
+async function syncInstructionFile(sourceRoot, repoDir, relPath, aiMergeAssistant = null) {
+  const src = path.join(sourceRoot, relPath);
+  if (!fs.existsSync(src)) return null;
+
+  const dest = path.join(repoDir, relPath);
+  fs.mkdirSync(path.dirname(dest), { recursive: true });
+
+  if (!fs.existsSync(dest)) {
+    fs.copyFileSync(src, dest);
+    return relPath;
+  }
+
+  const existingText = fs.readFileSync(dest, 'utf8');
+  const sourceText = fs.readFileSync(src, 'utf8');
+  const merged = await mergeInstructionText(existingText, sourceText, relPath, aiMergeAssistant);
+  if (merged !== existingText) {
+    fs.writeFileSync(dest, merged, 'utf8');
+  }
+  return relPath;
+}
+
+function syncTree(sourceRoot, repoDir, relDir) {
   const srcDir = path.join(sourceRoot, relDir);
   if (!fs.existsSync(srcDir)) return [];
 
   const copied = [];
   for (const entry of fs.readdirSync(srcDir, { withFileTypes: true })) {
     const relPath = path.join(relDir, entry.name);
-    const src = path.join(sourceRoot, relPath);
-    const dest = path.join(repoDir, relPath);
     if (entry.isDirectory()) {
-      copied.push(...copyTree(sourceRoot, repoDir, relPath));
+      copied.push(...syncTree(sourceRoot, repoDir, relPath));
       continue;
     }
-    fs.mkdirSync(path.dirname(dest), { recursive: true });
-    fs.copyFileSync(src, dest);
-    copied.push(relPath);
+    const synced = syncFileOverwrite(sourceRoot, repoDir, relPath);
+    if (synced) copied.push(synced);
   }
   return copied;
 }
 
-function copyFileOverwrite(sourceRoot, repoDir, relPath) {
-  const src = path.join(sourceRoot, relPath);
-  if (!fs.existsSync(src)) return null;
-  const dest = path.join(repoDir, relPath);
-  fs.mkdirSync(path.dirname(dest), { recursive: true });
-  fs.copyFileSync(src, dest);
-  return relPath;
-}
-
 export function getRepoState(repoDir, _spawnSync = spawnSync) {
   const run = makeRunner(_spawnSync);
   const headSha = readGitOutput(run, ['rev-parse', 'HEAD'], repoDir);
@@ -146,26 +291,30 @@ export async function commitAndPush(workspace, repoDir, _spawnSync = spawnSync,
       }
 
       const existingSyncPaths = new Set();
+      const aiMergeAssistant = await getInstructionMergeAssistant();
 
-      // Copy action skill trees into the target repo. Existing files are overwritten;
-      // missing source files are ignored so we do not delete target repo content.
+      // Copy action skill trees into the target repo. Existing files are merged with
+      // the action source; missing source files are ignored so we do not delete
+      // target repo content.
       for (const relDir of SYNC_TREE_PATHS) {
-        for (const relPath of copyTree(sourceRoot, repoDir, relDir)) {
+        for (const relPath of syncTree(sourceRoot, repoDir, relDir)) {
           existingSyncPaths.add(relPath);
         }
       }
 
-      // Force overwrite the direct instruction files first so the target repo always
-      // receives the action-owned versions even if the repo has drifted.
+      // Merge only the direct instruction files that must preserve repository-specific
+      // skills, commands, and rules. Everything else keeps the source copy.
       for (const relPath of FORCE_SYNC_FILE_PATHS) {
-        const copied = copyFileOverwrite(sourceRoot, repoDir, relPath);
+        const copied = MERGE_SYNC_FILE_PATHS.has(relPath)
+          ? await syncInstructionFile(sourceRoot, repoDir, relPath, aiMergeAssistant)
+          : syncFileOverwrite(sourceRoot, repoDir, relPath);
         if (copied) existingSyncPaths.add(copied);
       }
 
-      // Copy standalone action files into the target repo. Existing files are overwritten.
+      // Merge standalone action files into the target repo.
       for (const relPath of SYNC_PATHS) {
         if (FORCE_SYNC_FILE_PATHS.includes(relPath)) continue;
-        const copied = copyFileOverwrite(sourceRoot, repoDir, relPath);
+        const copied = syncFileOverwrite(sourceRoot, repoDir, relPath);
         if (copied) existingSyncPaths.add(copied);
       }
 

app/git.test.js

@@ -3,7 +3,7 @@ import assert from 'node:assert/strict';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
-import { commitAndPush, cloneRepo, SYNC_PATHS, BOT_COMMIT_MARKER, getHeadCommitMessage, isBotAutoCommit } from './git.js';
+import { commitAndPush, cloneRepo, SYNC_PATHS, BOT_COMMIT_MARKER, getHeadCommitMessage, isBotAutoCommit, mergeInstructionText } from './git.js';
 
 // --- helpers ---
 function makeTmpWorkspace() {
@@ -130,11 +130,13 @@ describe('commitAndPush', () => {
     assert.ok(generatedAddCall, 'expected git add for generated review files');
     assert.ok(skillAddCall.args.includes('.codex/skills/triage-findings/SKILL.md'));
     assert.ok(skillAddCall.args.includes('.codex/skills/triage-findings/agents/openai.yaml'));
+    assert.ok(skillAddCall.args.includes('.agents/skills/triage-findings/SKILL.md'));
     assert.ok(skillAddCall.args.includes('.claude/skills/triage-findings/SKILL.md'));
     assert.ok(skillAddCall.args.includes('.gemini/skills/triage-findings/SKILL.md'));
     assert.ok(skillAddCall.args.includes('.antigravity/skills/triage-findings/SKILL.md'));
     assert.ok(skillAddCall.args.includes('.github/copilot-instructions.md'));
     assert.ok(skillAddCall.args.includes('.amazonq/rules/triage-findings.md'));
+    assert.ok(skillAddCall.args.includes('AGENTS.md'));
     assert.ok(skillAddCall.args.includes('ANTIGRAVITY.md'));
     assert.ok(skillAddCall.args.includes('CLAUDE.md'));
     assert.ok(skillAddCall.args.includes('GEMINI.md'));
@@ -157,36 +159,79 @@ describe('commitAndPush', () => {
     assert.equal(fs.readFileSync(repoPath, 'utf8'), 'stale');
   });
 
-  it('overwrites existing repo copies with workspace files', async () => {
+  it('merges existing repo copies with workspace files', async () => {
     const repoDir = path.join(workspace, 'repo');
-    fs.writeFileSync(path.join(repoDir, '.github/skills/triage-findings/SKILL.md'), 'stale');
-    fs.writeFileSync(path.join(repoDir, 'ANTIGRAVITY.md'), 'stale');
-    fs.writeFileSync(path.join(repoDir, 'CLAUDE.md'), 'stale');
-    fs.writeFileSync(path.join(repoDir, 'GEMINI.md'), 'stale');
-    fs.writeFileSync(path.join(repoDir, '.github/copilot-instructions.md'), 'stale');
+    fs.writeFileSync(path.join(repoDir, 'AGENTS.md'), 'repo agents doc');
+    fs.writeFileSync(path.join(repoDir, 'ANTIGRAVITY.md'), 'repo antigravity doc');
+    fs.writeFileSync(path.join(repoDir, 'CLAUDE.md'), 'repo claude doc');
+    fs.writeFileSync(path.join(repoDir, 'GEMINI.md'), 'repo gemini doc');
 
     await commitAndPush(workspace, repoDir, makeSpawn(), sourceRoot);
 
-    assert.equal(fs.readFileSync(path.join(repoDir, '.github/skills/triage-findings/SKILL.md'), 'utf8'), '.github/skills/triage-findings/SKILL.md');
-    assert.equal(fs.readFileSync(path.join(repoDir, 'ANTIGRAVITY.md'), 'utf8'), 'ANTIGRAVITY.md');
-    assert.equal(fs.readFileSync(path.join(repoDir, 'CLAUDE.md'), 'utf8'), 'CLAUDE.md');
-    assert.equal(fs.readFileSync(path.join(repoDir, 'GEMINI.md'), 'utf8'), 'GEMINI.md');
-    assert.equal(fs.readFileSync(path.join(repoDir, '.github/copilot-instructions.md'), 'utf8'), '.github/copilot-instructions.md');
+    const agentsDoc = fs.readFileSync(path.join(repoDir, 'AGENTS.md'), 'utf8');
+    const antigravityDoc = fs.readFileSync(path.join(repoDir, 'ANTIGRAVITY.md'), 'utf8');
+    const claudeDoc = fs.readFileSync(path.join(repoDir, 'CLAUDE.md'), 'utf8');
+    const geminiDoc = fs.readFileSync(path.join(repoDir, 'GEMINI.md'), 'utf8');
+
+    assert.ok(agentsDoc.includes('repo agents doc'));
+    assert.ok(agentsDoc.includes('AGENTS.md'));
+    assert.ok(antigravityDoc.includes('repo antigravity doc'));
+    assert.ok(antigravityDoc.includes('ANTIGRAVITY.md'));
+    assert.ok(claudeDoc.includes('repo claude doc'));
+    assert.ok(claudeDoc.includes('CLAUDE.md'));
+    assert.ok(geminiDoc.includes('repo gemini doc'));
+    assert.ok(geminiDoc.includes('GEMINI.md'));
+    assert.ok(agentsDoc.includes('repo agents doc'));
   });
 
-  it('recursively overwrites skill tree files from the action source', async () => {
+  it('accepts AI merged instruction text when all unique blocks are preserved', async () => {
+    const calls = [];
+    const aiMergeAssistant = async payload => {
+      calls.push(payload);
+      return ['repo block', 'source block', 'extra block'].join('\n\n');
+    };
+
+    const result = await mergeInstructionText('repo block', 'source block', 'AGENTS.md', aiMergeAssistant);
+
+    assert.equal(calls.length, 1);
+    assert.ok(result.includes('repo block'));
+    assert.ok(result.includes('source block'));
+    assert.ok(result.includes('extra block'));
+  });
+
+  it('exits when AI output drops a block', async () => {
+    const originalExit = process.exit;
+    let exitCode = null;
+    process.exit = code => { exitCode = code; };
+    try {
+      const aiMergeAssistant = async () => 'source block only';
+      await assert.rejects(() => mergeInstructionText('repo block', 'source block', 'AGENTS.md', aiMergeAssistant));
+      assert.equal(exitCode, 1);
+    } finally {
+      process.exit = originalExit;
+    }
+  });
+
+  it('overwrites non-merge sync files with workspace files', async () => {
     const repoDir = path.join(workspace, 'repo');
-    const nestedRelPath = '.codex/skills/triage-findings/assets/example.txt';
-    const sourceNestedPath = path.join(sourceRoot, nestedRelPath);
-    const repoNestedPath = path.join(repoDir, nestedRelPath);
+    const sourceSkillPath = path.join(sourceRoot, '.github/skills/triage-findings/SKILL.md');
+    const repoSkillPath = path.join(repoDir, '.github/skills/triage-findings/SKILL.md');
+    const sourceNestedPath = path.join(sourceRoot, '.codex/skills/triage-findings/assets/example.txt');
+    const repoNestedPath = path.join(repoDir, '.codex/skills/triage-findings/assets/example.txt');
+
+    fs.writeFileSync(sourceSkillPath, 'fresh github skill');
+    fs.writeFileSync(repoSkillPath, 'stale github skill');
     fs.mkdirSync(path.dirname(sourceNestedPath), { recursive: true });
-    fs.writeFileSync(sourceNestedPath, 'fresh');
+    fs.writeFileSync(sourceNestedPath, 'fresh nested');
     fs.mkdirSync(path.dirname(repoNestedPath), { recursive: true });
-    fs.writeFileSync(repoNestedPath, 'stale');
+    fs.writeFileSync(repoNestedPath, 'stale nested');
+    fs.writeFileSync(path.join(repoDir, '.github/copilot-instructions.md'), 'stale copilot');
 
     await commitAndPush(workspace, repoDir, makeSpawn(), sourceRoot);
 
-    assert.equal(fs.readFileSync(repoNestedPath, 'utf8'), 'fresh');
+    assert.equal(fs.readFileSync(repoSkillPath, 'utf8'), 'fresh github skill');
+    assert.equal(fs.readFileSync(repoNestedPath, 'utf8'), 'fresh nested');
+    assert.equal(fs.readFileSync(path.join(repoDir, '.github/copilot-instructions.md'), 'utf8'), '.github/copilot-instructions.md');
   });
 
   it('does not throw when git command fails', async () => {

app/gitea.js

@@ -26,12 +26,14 @@ export async function getPRDiff() {
   const resp = await axios.get(api(`/repos/${GITEA_REPOSITORY}/pulls/${PR_NUMBER}.diff`), { headers: headers(), timeout: 60000, httpsAgent });
   return filterDiff(resp.data, [
     '.amazonq/',
+    '.agents/',
     '.antigravity/',
     '.claude/',
     '.codex/',
     '.gemini/',
     '.gitea/',
     '.github/',
+    'AGENTS.md',
     'ANTIGRAVITY.md',
     'CLAUDE.md',
     'GEMINI.md',

app/gitea.test.js

@@ -119,8 +119,8 @@ describe('filterDiff', () => {
   });
 
   it('returns empty string when all blocks are excluded', () => {
-    const diff = block('.gitea/workflows/review.yaml') + block('.gitea/ai-review/findings.json') + block('CLAUDE.md');
-    const result = filterDiff(diff, ['.gitea/', 'CLAUDE.md']);
+    const diff = block('.gitea/workflows/review.yaml') + block('.gitea/ai-review/findings.json') + block('.agents/skills/triage-findings/SKILL.md');
+    const result = filterDiff(diff, ['.gitea/', '.agents/']);
     assert.equal(result, '');
   });