diff --git a/.agents/plugins/marketplace.json b/.agents/plugins/marketplace.json
new file mode 100644
index 0000000..2932840
--- /dev/null
+++ b/.agents/plugins/marketplace.json
@@ -0,0 +1,20 @@
+{
+  "name": "cjysa-free",
+  "interface": {
+    "displayName": "CJYSA 免费插件市场"
+  },
+  "plugins": [
+    {
+      "name": "cjysa-relay-basic",
+      "source": {
+        "source": "local",
+        "path": "./plugins/cjysa-relay-basic"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Developer Tools"
+    }
+  ]
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..02a1ffe
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+# Changelog
+
+## 0.1.0 - 2026-07-22
+
+- 创建 CJYSA 免费插件市场。
+- 添加 `cjysa-relay-basic` 基础插件。
+- 添加 Codex 中转连接与能力诊断 Skill。
diff --git a/README.md b/README.md
index 3fef8bb..637d846 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,33 @@
-# codex-
\ No newline at end of file
+# CJYSA Codex Free Marketplace
+
+CJYSA 面向 Codex 用户提供的免费插件市场。
+
+## 安装
+
+在 Codex 中添加以下市场来源：
+
+```text
+CJYSEX/codex-
+```
+
+添加后安装 `cjysa-relay-basic`。
+
+## 当前插件
+
+### cjysa-relay-basic
+
+提供基础的 Codex 中转连接与兼容性诊断，包括：
+
+- 模型列表与认证检查
+- Responses API 检查
+- SSE 流式输出检查
+- 首字延迟分层诊断
+- Web Search、图片生成和函数调用能力检查
+
+## 安全
+
+本仓库不包含任何客户 API Key、服务器密码或中转上游凭据。提交问题或诊断日志前，请先删除授权头、令牌、Cookie 和签名链接。
+
+## 许可证
+
+Apache-2.0
diff --git a/plugins/cjysa-relay-basic/.codex-plugin/plugin.json b/plugins/cjysa-relay-basic/.codex-plugin/plugin.json
new file mode 100644
index 0000000..86252c8
--- /dev/null
+++ b/plugins/cjysa-relay-basic/.codex-plugin/plugin.json
@@ -0,0 +1,36 @@
+{
+  "name": "cjysa-relay-basic",
+  "version": "0.1.0",
+  "description": "面向 Codex 中转用户的免费连接与兼容性诊断插件。",
+  "author": {
+    "name": "CJYSEX",
+    "url": "https://github.com/CJYSEX"
+  },
+  "homepage": "https://github.com/CJYSEX/codex-",
+  "repository": "https://github.com/CJYSEX/codex-",
+  "license": "Apache-2.0",
+  "keywords": [
+    "codex",
+    "relay",
+    "responses-api",
+    "diagnostics"
+  ],
+  "skills": "./skills/",
+  "interface": {
+    "displayName": "CJYSA 中转基础工具",
+    "shortDescription": "检测 Codex 中转连接、Responses、流式输出和工具能力。",
+    "longDescription": "提供不会泄露密钥的基础诊断流程，帮助用户检查 Codex 中转地址、模型列表、Responses API、SSE 流式输出和工具能力。",
+    "developerName": "CJYSEX",
+    "category": "Developer Tools",
+    "capabilities": [
+      "Diagnostics",
+      "Read"
+    ],
+    "websiteURL": "https://github.com/CJYSEX/codex-",
+    "defaultPrompt": [
+      "帮我检测当前 Codex 中转配置和可用能力。",
+      "检查 Responses API 和 SSE 流式输出是否正常。",
+      "排查 Web Search 或图片生成为什么不可用。"
+    ]
+  }
+}
diff --git a/plugins/cjysa-relay-basic/README.md b/plugins/cjysa-relay-basic/README.md
new file mode 100644
index 0000000..a2972c5
--- /dev/null
+++ b/plugins/cjysa-relay-basic/README.md
@@ -0,0 +1,5 @@
+# CJYSA Relay Basic
+
+面向 Codex 中转用户的免费基础诊断插件。
+
+插件只提供诊断工作流，不保存客户密钥，也不会在未经用户明确同意时修改 Codex 配置。
diff --git a/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/SKILL.md b/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/SKILL.md
new file mode 100644
index 0000000..f9c5a80
--- /dev/null
+++ b/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/SKILL.md
@@ -0,0 +1,58 @@
+---
+name: diagnose-codex-relay
+description: Diagnose Codex relay connectivity and compatibility without exposing credentials. Use when a user asks to test a custom API base URL, list available models, verify the Responses API or SSE streaming, investigate first-token latency, or check whether web search, image generation, and function calling are available through a relay.
+---
+
+# Diagnose Codex Relay
+
+Diagnose one layer at a time and report evidence instead of assuming a capability works.
+
+## Safety
+
+- Never print, quote, save, or commit an API key.
+- Redact authorization headers, query tokens, cookies, passwords, and signed URLs.
+- Prefer read-only health checks and minimal requests.
+- Ask before running sustained concurrency or bandwidth tests.
+- Do not modify Codex configuration unless the user explicitly asks for a change.
+
+## Workflow
+
+1. Identify the configured API base URL without displaying its secret.
+2. Check DNS resolution, TLS validity, and basic HTTP reachability.
+3. Request `/v1/models` and record status, elapsed time, and returned model IDs.
+4. Send a minimal synchronous request to the requested model.
+5. Test `/v1/responses` separately from Chat Completions.
+6. Test SSE streaming and measure time to the first meaningful event.
+7. Test function calling, web search, or image generation only when the user requests it.
+8. Separate client, reverse-proxy, relay, and upstream latency when diagnosing delays.
+9. Report results as passed, failed, unsupported, or not tested.
+
+## Evidence
+
+For each test, record:
+
+- Endpoint category, without secret query parameters.
+- HTTP status or transport error.
+- Total elapsed time and first-event latency where applicable.
+- Whether valid response content was received.
+- Whether the result proves the claimed capability.
+
+Do not claim web search succeeded without a returned search result or source. Do not claim image generation succeeded without a native image result or generated artifact.
+
+## Diagnosis Rules
+
+- `/v1/models` succeeding proves authentication and catalog access only.
+- A synchronous response does not prove SSE streaming works.
+- Chat Completions success does not prove the Responses API works.
+- A model name appearing in the catalog does not prove tool support.
+- Compare direct relay access with the public domain when isolating reverse-proxy delay.
+- When context length affects latency, compare short and long prompts separately.
+
+## Output
+
+Return a compact table of tests, followed by:
+
+- The most likely fault layer.
+- Tests that were not performed.
+- The smallest next action.
+- A reminder to rotate any credential accidentally exposed during testing.
diff --git a/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/agents/openai.yaml b/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/agents/openai.yaml
new file mode 100644
index 0000000..5b83aea
--- /dev/null
+++ b/plugins/cjysa-relay-basic/skills/diagnose-codex-relay/agents/openai.yaml
@@ -0,0 +1,4 @@
+interface:
+  display_name: "Codex 中转诊断"
+  short_description: "检查中转连接、Responses、流式输出和工具能力"
+  default_prompt: "帮我检测当前 Codex 中转配置和可用能力。"