diff --git a/packages/ui/src/components/sections/behavior/BehaviorPage.tsx b/packages/ui/src/components/sections/behavior/BehaviorPage.tsx
index 758c954c..6738da19 100644
--- a/packages/ui/src/components/sections/behavior/BehaviorPage.tsx
+++ b/packages/ui/src/components/sections/behavior/BehaviorPage.tsx
@@ -1,4 +1,5 @@
 import React from 'react';
+import { z } from 'zod';
 import { Button } from '@/components/ui/button';
 import { Textarea } from '@/components/ui/textarea';
 import { toast } from '@/components/ui';
@@ -30,7 +31,11 @@ import {
   SETTINGS_SELECT_SIZE,
 } from '@/components/sections/shared/SettingsSection';
 
-const AGENTS_MD_PATH = '~/.config/opencode/AGENTS.md';
+const agentsMdResponseSchema = z.object({
+  content: z.string(),
+  exists: z.boolean(),
+  path: z.string().min(1).optional(),
+});
 
 const readApiError = async (response: Response, fallback: string) => {
   const data = await response.json().catch(() => null) as { error?: unknown } | null;
@@ -104,6 +109,7 @@ export const BehaviorPage: React.FC = () => {
   const { t } = useI18n();
   const isVSCode = useIsVSCodeRuntime();
   const [prompt, setPrompt] = React.useState('');
+  const [agentsMdPath, setAgentsMdPath] = React.useState('AGENTS.md');
   const [optimizeSystemPrompt, setOptimizeSystemPrompt] = React.useState(false);
   const [responseStyleEnabled, setResponseStyleEnabled] = React.useState(DEFAULT_BEHAVIOR_SETTINGS.responseStyleEnabled);
   const [responseStylePreset, setResponseStylePreset] = React.useState<ResponseStyleValue>(DEFAULT_BEHAVIOR_SETTINGS.responseStylePreset);
@@ -154,9 +160,11 @@ export const BehaviorPage: React.FC = () => {
           }
         }
 
-        if (!nextSettings.prompt.trim() && agentsMdRes.ok) {
-          const agentsData = await agentsMdRes.json();
-          if (typeof agentsData.content === 'string') {
+        if (agentsMdRes.ok) {
+          const agentsData = agentsMdResponseSchema.parse(await agentsMdRes.json());
+          if (abort.signal.aborted) return;
+          setAgentsMdPath(agentsData.path ?? 'AGENTS.md');
+          if (!nextSettings.prompt.trim()) {
             nextSettings = { ...nextSettings, prompt: agentsData.content };
           }
         }
@@ -326,7 +334,7 @@ export const BehaviorPage: React.FC = () => {
               {t('settings.behavior.page.warning.title')}
             </p>
             <p>
-              {t('settings.behavior.page.warning.description', { path: AGENTS_MD_PATH })}
+              {t('settings.behavior.page.warning.description', { path: agentsMdPath })}
             </p>
           </div>
         )}
diff --git a/packages/ui/src/lib/opencode/client.ts b/packages/ui/src/lib/opencode/client.ts
index 608077a4..1a5f27e6 100644
--- a/packages/ui/src/lib/opencode/client.ts
+++ b/packages/ui/src/lib/opencode/client.ts
@@ -1301,12 +1301,10 @@ class OpencodeService {
    * endpoint introduced in OpenCode SDK v1.17.12. Wraps
    * `session.permission.get`.
    *
-   * Returns a tagged `FetchPermissionResult` so the caller can distinguish
-   * a confirmed-resolved permission (HTTP 404) from a fetch failure
-   * (network error, malformed response, or pre-v1.17.12 server without
-   * the V2 endpoint). The auto-accept flow uses this distinction to drop
-   * resolved permissions from the resync output, preventing stale
-   * `permission.list` entries from sticking around in the UI.
+   * Returns the state of the V2 permission authority. Its HTTP 404 result
+   * does not prove that a request from `permission.list` has settled:
+   * list-derived reconciliation must use that list's own reply path.
+   * Fetch failures remain distinct from the V2 resolved result.
    */
   async fetchPermission(
     sessionID: string,
diff --git a/packages/vscode/src/DOCUMENTATION.md b/packages/vscode/src/DOCUMENTATION.md
index 7aefa3ab..212c58fe 100644
--- a/packages/vscode/src/DOCUMENTATION.md
+++ b/packages/vscode/src/DOCUMENTATION.md
@@ -172,3 +172,14 @@ Reachable filesystem routes: `api:fs:read` (attachments, config), `api:fs:search
 
 Maintenance: reviews, changelog entries, and parity claims consult this map;
 whoever mounts or unmounts a surface updates it in the same change.
+
+## Global OpenCode paths
+
+`opencodeConfigPaths.ts` owns the global config directory for config CRUD,
+skill discovery/install, global AGENTS.md, and quota config-file lookup. It
+resolves `$XDG_CONFIG_HOME/opencode` at extension startup, falling back to
+`~/.config/opencode` when unset or blank. Project paths, the explicit
+`OPENCODE_CONFIG` file layer, and the auth data directory stay separate.
+No files are migrated. The behavior GET bridge response includes the effective
+`path` for both existing and missing AGENTS.md files; shared Settings uses it
+in the warning.
diff --git a/packages/vscode/src/bridge-config-runtime.ts b/packages/vscode/src/bridge-config-runtime.ts
index 463353b3..44f1cb5c 100644
--- a/packages/vscode/src/bridge-config-runtime.ts
+++ b/packages/vscode/src/bridge-config-runtime.ts
@@ -1,6 +1,6 @@
+import { OPENCODE_CONFIG_DIR } from './opencodeConfigPaths';
 import * as vscode from 'vscode';
 import * as fs from 'fs';
-import * as os from 'os';
 import * as path from 'path';
 import {
   createAgent,
@@ -78,7 +78,7 @@ type ConfigRuntimeDeps = {
   clientReloadDelayMs: number;
 };
 
-const AGENTS_MD_PATH = path.join(os.homedir(), '.config', 'opencode', 'AGENTS.md');
+const AGENTS_MD_PATH = path.join(OPENCODE_CONFIG_DIR, 'AGENTS.md');
 const MAX_BEHAVIOR_PROMPT_SIZE = 1024 * 1024;
 
 const resolveWorkingDirectory = (ctx: BridgeContext | undefined, directory?: string): string | undefined => (
@@ -186,10 +186,10 @@ export async function handleConfigBridgeMessage(
     case 'api:behavior/agents-md:get': {
       try {
         const content = await fs.promises.readFile(AGENTS_MD_PATH, 'utf8');
-        return { id, type, success: true, data: { content, exists: true } };
+        return { id, type, success: true, data: { content, exists: true, path: AGENTS_MD_PATH } };
       } catch (error) {
         if ((error as NodeJS.ErrnoException)?.code === 'ENOENT') {
-          return { id, type, success: true, data: { content: '', exists: false } };
+          return { id, type, success: true, data: { content: '', exists: false, path: AGENTS_MD_PATH } };
         }
         throw error;
       }
diff --git a/packages/vscode/src/bridge-settings-runtime.ts b/packages/vscode/src/bridge-settings-runtime.ts
index ee48b7e8..d2b01669 100644
--- a/packages/vscode/src/bridge-settings-runtime.ts
+++ b/packages/vscode/src/bridge-settings-runtime.ts
@@ -1,3 +1,4 @@
+import { OPENCODE_CONFIG_DIR } from './opencodeConfigPaths';
 import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
@@ -76,7 +77,7 @@ const inferSkillScopeAndSourceFromLocation = (location: string, workingDirectory
 
   const home = os.homedir();
   const userRoots = [
-    path.join(home, '.config', 'opencode'),
+    OPENCODE_CONFIG_DIR,
     path.join(home, '.opencode'),
     path.join(home, '.claude', 'skills'),
     path.join(home, '.agents', 'skills'),
diff --git a/packages/vscode/src/opencodeConfig.ts b/packages/vscode/src/opencodeConfig.ts
index 629aecaa..dbf8e28f 100644
--- a/packages/vscode/src/opencodeConfig.ts
+++ b/packages/vscode/src/opencodeConfig.ts
@@ -1,10 +1,10 @@
+import { OPENCODE_CONFIG_DIR } from './opencodeConfigPaths';
 import fs from 'node:fs';
 import path from 'node:path';
 import os from 'node:os';
 import yaml from 'yaml';
 import { parse as parseJsonc, printParseErrorCode, type ParseError } from 'jsonc-parser';
 
-const OPENCODE_CONFIG_DIR = path.join(os.homedir(), '.config', 'opencode');
 const AGENT_DIR = path.join(OPENCODE_CONFIG_DIR, 'agents');
 const COMMAND_DIR = path.join(OPENCODE_CONFIG_DIR, 'commands');
 const GLOBAL_SNIPPET_DIR = path.join(OPENCODE_CONFIG_DIR, 'snippet');
diff --git a/packages/vscode/src/opencodeConfigPaths.test.ts b/packages/vscode/src/opencodeConfigPaths.test.ts
new file mode 100644
index 00000000..f422c154
--- /dev/null
+++ b/packages/vscode/src/opencodeConfigPaths.test.ts
@@ -0,0 +1,51 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { spawnSync } from 'node:child_process';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+
+const moduleUrl = new URL('./opencodeConfigPaths.ts', import.meta.url).href;
+const configUrl = new URL('./opencodeConfig.ts', import.meta.url).href;
+
+test('unset and blank XDG keep the existing global directory', () => {
+  for (const value of [undefined, '', '   ']) {
+    const env = { ...process.env };
+    if (value === undefined) delete env.XDG_CONFIG_HOME;
+    else env.XDG_CONFIG_HOME = value;
+    const result = spawnSync(process.execPath, ['--eval', `
+      const { OPENCODE_CONFIG_DIR } = await import(${JSON.stringify(moduleUrl)});
+      process.stdout.write(OPENCODE_CONFIG_DIR);
+    `], { env, encoding: 'utf8' });
+    assert.equal(result.status, 0, result.stderr);
+    assert.equal(result.stdout, path.join(os.homedir(), '.config', 'opencode'));
+  }
+});
+
+test('global CRUD uses XDG while project writes stay in the project', () => {
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'openchamber-vscode-xdg-'));
+  const configHome = path.join(root, 'config');
+  const project = path.join(root, 'project');
+  try {
+    const result = spawnSync(process.execPath, ['--eval', `
+      const { createAgent, createCommand, createSkill } = await import(${JSON.stringify(configUrl)});
+      const project = ${JSON.stringify(project)};
+      for (const scope of ['user', 'project']) {
+        createAgent(scope + '-agent', { description: 'Test', prompt: 'Test prompt' }, project, scope);
+        createCommand(scope + '-command', { description: 'Test', template: 'Test command' }, project, scope);
+        createSkill(scope + '-skill', { description: 'Test', instructions: 'Test skill' }, project, scope);
+      }
+    `], {
+      env: { ...process.env, XDG_CONFIG_HOME: configHome, OPENCODE_CONFIG: '', OPENCODE_CONFIG_DIR: '' },
+      encoding: 'utf8',
+    });
+    assert.equal(result.status, 0, result.stderr);
+    for (const [scope, directory] of [['user', path.join(configHome, 'opencode')], ['project', path.join(project, '.opencode')]]) {
+      assert.match(fs.readFileSync(path.join(directory, 'agents', `${scope}-agent.md`), 'utf8'), /Test prompt/);
+      assert.match(fs.readFileSync(path.join(directory, 'commands', `${scope}-command.md`), 'utf8'), /Test command/);
+      assert.match(fs.readFileSync(path.join(directory, 'skills', `${scope}-skill`, 'SKILL.md'), 'utf8'), /Test skill/);
+    }
+  } finally {
+    fs.rmSync(root, { recursive: true, force: true });
+  }
+});
diff --git a/packages/vscode/src/opencodeConfigPaths.ts b/packages/vscode/src/opencodeConfigPaths.ts
new file mode 100644
index 00000000..bd8c19b7
--- /dev/null
+++ b/packages/vscode/src/opencodeConfigPaths.ts
@@ -0,0 +1,8 @@
+import os from 'node:os';
+import path from 'node:path';
+
+// Resolve once at extension startup, matching the web backend.
+export const OPENCODE_CONFIG_DIR = path.join(
+  process.env.XDG_CONFIG_HOME?.trim() || path.join(os.homedir(), '.config'),
+  'opencode',
+);
diff --git a/packages/vscode/src/quotaProviders.ts b/packages/vscode/src/quotaProviders.ts
index c275a07d..74be878f 100644
--- a/packages/vscode/src/quotaProviders.ts
+++ b/packages/vscode/src/quotaProviders.ts
@@ -1,3 +1,4 @@
+import { OPENCODE_CONFIG_DIR } from './opencodeConfigPaths';
 import fs from 'node:fs';
 import path from 'node:path';
 import os from 'node:os';
@@ -191,7 +192,6 @@ export type ProviderResult = {
   planLabel?: string | null;
 };
 
-const OPENCODE_CONFIG_DIR = path.join(os.homedir(), '.config', 'opencode');
 const OPENCODE_DATA_DIR = path.join(os.homedir(), '.local', 'share', 'opencode');
 const AUTH_FILE = path.join(OPENCODE_DATA_DIR, 'auth.json');
 
diff --git a/packages/vscode/src/skillsCatalog.ts b/packages/vscode/src/skillsCatalog.ts
index f9a171f6..7f1ac586 100644
--- a/packages/vscode/src/skillsCatalog.ts
+++ b/packages/vscode/src/skillsCatalog.ts
@@ -1,3 +1,4 @@
+import { OPENCODE_CONFIG_DIR } from './opencodeConfigPaths';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
@@ -418,8 +419,8 @@ async function copyDirectoryNoSymlinks(srcDir: string, dstDir: string) {
 }
 
 function getUserSkillBaseDir() {
-  const pluralPath = path.join(os.homedir(), '.config', 'opencode', 'skills');
-  const legacyPath = path.join(os.homedir(), '.config', 'opencode', 'skill');
+  const pluralPath = path.join(OPENCODE_CONFIG_DIR, 'skills');
+  const legacyPath = path.join(OPENCODE_CONFIG_DIR, 'skill');
   if (fs.existsSync(legacyPath) && !fs.existsSync(pluralPath)) return legacyPath;
   return pluralPath;
 }
diff --git a/packages/vscode/src/webviewHtml.ts b/packages/vscode/src/webviewHtml.ts
index 21894ea9..8ea45e22 100644
--- a/packages/vscode/src/webviewHtml.ts
+++ b/packages/vscode/src/webviewHtml.ts
@@ -228,11 +228,11 @@ export function getWebviewHtml(options: WebviewHtmlOptions): string {
         return {
           startingApi: 'OpenCode API başlatılıyor…',
           initializing: 'Başlatılıyor…',
-          connecting: 'Bağlanılıyor…',
+          connecting: 'Bağlanıyor…',
           connected: 'Bağlandı!',
           connectionError: 'Bağlantı hatası',
-          reconnecting: 'Yeniden bağlanılıyor…',
-          cliNotFound: 'OpenCode CLI bulunamadı. Lütfen önce yükleyin.',
+          reconnecting: 'Yeniden bağlanıyor…',
+          cliNotFound: 'OpenCode CLI bulunamadı. Lütfen önce kurun.',
         };
       }
       return {
@@ -310,8 +310,8 @@ export function getWebviewHtml(options: WebviewHtmlOptions): string {
               }
               if (detected.indexOf('tr') === 0) {
                 return {
-                  startingDevServer: (host) => 'Webview geliştirme sunucusu başlatılıyor (' + host + ')...',
-                  waitingDevServer: (host, attempt) => 'Webview geliştirme sunucusu bekleniyor (' + host + ')... deneme ' + attempt,
+                  startingDevServer: (host) => 'Webview dev sunucusu başlatılıyor (' + host + ')...',
+                  waitingDevServer: (host, attempt) => 'Webview dev sunucusu bekleniyor (' + host + ')... deneme ' + attempt,
                 };
               }
             }
diff --git a/packages/web/server/lib/opencode/DOCUMENTATION.md b/packages/web/server/lib/opencode/DOCUMENTATION.md
index 937113d0..814d1a76 100644
--- a/packages/web/server/lib/opencode/DOCUMENTATION.md
+++ b/packages/web/server/lib/opencode/DOCUMENTATION.md
@@ -421,7 +421,7 @@ an authoritative loopback callback URL even when OpenChamber binds port `0`.
 
 ## Storage and configuration
 - Provider auth: `~/.local/share/opencode/auth.json`.
-- User config: `~/.config/opencode/opencode.json`.
+- User config: `$XDG_CONFIG_HOME/opencode/opencode.json`, falling back to `~/.config/opencode/opencode.json` when unset or blank.
 - Project config: `<workingDirectory>/.opencode/opencode.json` or `opencode.json`.
 - Custom config: `OPENCODE_CONFIG` env var path.
 - Rate limit config: `OPENCHAMBER_RATE_LIMIT_MAX_ATTEMPTS`, `OPENCHAMBER_RATE_LIMIT_NO_IP_MAX_ATTEMPTS` env vars.
@@ -433,3 +433,7 @@ an authoritative loopback callback URL even when OpenChamber binds port `0`.
 - Config merging follows priority: custom > project > user.
 - UI auth uses scrypt for password hashing with constant-time comparison.
 - Tunnel auth treats `host.docker.internal` as local-only when the socket remote IP is private/loopback.
+
+The behavior `GET /api/behavior/agents-md` response includes `path`, the effective
+server-side filename, whether or not the file exists. Settings displays this
+path without deriving a directory from the browser environment.
diff --git a/packages/web/server/lib/opencode/config-paths.test.js b/packages/web/server/lib/opencode/config-paths.test.js
index 93957d90..22878cbf 100644
--- a/packages/web/server/lib/opencode/config-paths.test.js
+++ b/packages/web/server/lib/opencode/config-paths.test.js
@@ -99,10 +99,18 @@ describe('OpenCode global config paths', () => {
     routes.registerOpenCodeRoutes(app, {});
 
     const response = { json: vi.fn(), status: vi.fn(() => response) };
+    await handlers.get('GET /api/behavior/agents-md')({}, response);
+    expect(response.json).toHaveBeenLastCalledWith({
+      content: '', exists: false, path: path.join(process.env.XDG_CONFIG_HOME, 'opencode', 'AGENTS.md'),
+    });
+
     await handlers.get('PUT /api/behavior/agents-md')({ body: { content: 'Global behavior' } }, response);
 
     expect(fs.readFileSync(path.join(process.env.XDG_CONFIG_HOME, 'opencode', 'AGENTS.md'), 'utf8')).toBe('Global behavior');
-    expect(response.json).toHaveBeenCalled();
+    await handlers.get('GET /api/behavior/agents-md')({}, response);
+    expect(response.json).toHaveBeenLastCalledWith({
+      content: 'Global behavior', exists: true, path: path.join(process.env.XDG_CONFIG_HOME, 'opencode', 'AGENTS.md'),
+    });
     fs.rmSync(root, { recursive: true, force: true });
   });
 });
diff --git a/packages/web/server/lib/opencode/routes.js b/packages/web/server/lib/opencode/routes.js
index 5c5f21ca..310e5196 100644
--- a/packages/web/server/lib/opencode/routes.js
+++ b/packages/web/server/lib/opencode/routes.js
@@ -815,10 +815,10 @@ ${desktopReturn ? `<a class="return" href="openchamber://focus/mcp-auth">Return
       try {
         await fs.promises.access(AGENTS_MD_PATH);
       } catch {
-        return res.json({ content: '', exists: false });
+        return res.json({ content: '', exists: false, path: AGENTS_MD_PATH });
       }
       const content = await fs.promises.readFile(AGENTS_MD_PATH, 'utf8');
-      return res.json({ content, exists: true });
+      return res.json({ content, exists: true, path: AGENTS_MD_PATH });
     } catch (error) {
       console.error('Failed to read AGENTS.md:', error);
       return res.status(500).json({ error: 'Failed to read AGENTS.md' });