diff --git a/README.md b/README.md
index 974c9f2..65baa07 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ gitea.sh api <METHOD> <path> [json-file]
 
 ### `wiki`
 
-Gitea wiki 頁讀寫的統一入口：依頁面類型（QUESTION / PLAN / ANALYZE / MAINTAIN / REPO / LOG）解析 wiki 所在的 `{owner}/{repo}`，未設定環境變數時以決策樹詢問。
+Gitea wiki 頁讀寫的統一入口：依頁面類型（QUESTION / PLAN / ANALYZE / MAINTAIN / REPO / LOG）解析 wiki 所在的 `{owner}/{repo}`，未設定環境變數時以決策樹詢問。頁面內容以圖表優先（mermaid 圖、markdown 表格），純文字為最後手段。
 
 ### `repo-sync`
 
@@ -54,7 +54,7 @@ Gitea wiki 頁讀寫的統一入口：依頁面類型（QUESTION / PLAN / ANALYZ
 | 變數 | 用途 | 未設定時 |
 | --- | --- | --- |
 | `GITEA_HOST` | Gitea 站台（可省略 scheme，預設 https） | 詢問使用者 |
-| `GITEA_TOKEN` | Gitea API token | 詢問使用者 |
+| `GITEA_TOKEN` | Gitea API token；缺少或遇 401/403 時自動退回 tea CLI 登入 token | 詢問使用者 |
 | `JSC_WIKI_REPO_{TYPE}` | 各類型 wiki 頁的 `{owner}/{repo}`；TYPE = QUESTION / PLAN / ANALYZE / MAINTAIN / REPO / LOG | 退回 `JSC_WIKI_REPO` |
 | `JSC_WIKI_REPO` | 共用預設的 wiki `{owner}/{repo}` | 詢問使用者 |
 
diff --git a/skills/wiki/SKILL.md b/skills/wiki/SKILL.md
index 8e85c5a..efab159 100644
--- a/skills/wiki/SKILL.md
+++ b/skills/wiki/SKILL.md
@@ -1,6 +1,6 @@
 ---
 name: wiki
-description: Read or write a Gitea wiki page through tools/gitea.sh with GITEA_TOKEN. Resolve the wiki repo per page type (QUESTION/PLAN/ANALYZE/MAINTAIN/REPO/LOG) via gitea.sh wiki-repo, falling back to JSC_WIKI_REPO or a decision-tree question. Used by jsc-ask, jsc-sdlc, and jsc-log for all wiki pages; not for repo code files.
+description: Read or write a Gitea wiki page through tools/gitea.sh with GITEA_TOKEN. Resolve the wiki repo per page type (QUESTION/PLAN/ANALYZE/MAINTAIN/REPO/LOG) via gitea.sh wiki-repo, falling back to JSC_WIKI_REPO or a decision-tree question. Page content is chart-first - prefer mermaid diagrams and markdown tables over plain prose. Used by jsc-ask, jsc-sdlc, and jsc-log for all wiki pages; not for repo code files.
 ---
 
 # wiki — read and write Gitea wiki pages
@@ -27,3 +27,5 @@ Different page types can live in different `{owner}/{repo}` repos, classified by
 1. Page names must follow the wiki naming table in the skill guidelines (see `jsc-meta/references/guidelines.md`).
 2. To update a contents page (`*_CONTENTS`): `wiki-get` it first, apply the template to append or modify, then `wiki-put` the whole page back. Never overwrite entries owned by others.
 3. Write all wiki content in UTF-8 Traditional Chinese, per the STE100 output rule.
+4. Prefer visual forms for page content: use mermaid diagrams (flowchart, sequence, gantt, pie) and markdown tables wherever the information allows. Plain running text is the last resort, kept short.
+5. Authentication fallback is built into `tools/gitea.sh`: on a missing GITEA_TOKEN or a 401/403 response it retries with the tea CLI login token automatically, so only report an auth failure when both paths fail.