diff --git a/marketplace.json b/marketplace.json
index b988fe5..e02a74e 100644
--- a/marketplace.json
+++ b/marketplace.json
@@ -10,6 +10,22 @@
     "url": "https://z.ai"
   },
   "plugins": [
+    {
+      "name": "sounio",
+      "source": "./plugins/sounio",
+      "description": "Check Sounio source files with an existing local compiler and report the exact evidence level.",
+      "description_i18n": {
+        "en": "Check Sounio source files with an existing local compiler and report the exact evidence level.",
+        "zh-CN": "使用已有的本地编译器检查 Sounio 源文件，并准确说明验证证据的层级。"
+      },
+      "version": "0.1.0",
+      "author": {
+        "name": "Demetrios Agourakis",
+        "url": "https://github.com/agourakis82"
+      },
+      "category": "developer-tools",
+      "keywords": ["sounio", "compiler", "scientific-programming", "diagnostics"]
+    },
     {
       "name": "cloudbase-skills",
       "source": "./plugins/cloudbase-skills",
diff --git a/plugins/sounio/.zcode-plugin/plugin.json b/plugins/sounio/.zcode-plugin/plugin.json
new file mode 100644
index 0000000..a022c57
--- /dev/null
+++ b/plugins/sounio/.zcode-plugin/plugin.json
@@ -0,0 +1,16 @@
+{
+  "name": "sounio",
+  "version": "0.1.0",
+  "description": "Check Sounio source files with an existing local compiler and report the exact evidence level.",
+  "description_i18n": {
+    "en": "Check Sounio source files with an existing local compiler and report the exact evidence level.",
+    "zh-CN": "使用已有的本地编译器检查 Sounio 源文件，并准确说明验证证据的层级。"
+  },
+  "author": {
+    "name": "Demetrios Agourakis",
+    "url": "https://github.com/agourakis82"
+  },
+  "homepage": "https://github.com/Sounio-lang/sounio",
+  "license": "Apache-2.0",
+  "keywords": ["sounio", "compiler", "scientific-programming", "diagnostics"]
+}
diff --git a/plugins/sounio/README.md b/plugins/sounio/README.md
new file mode 100644
index 0000000..faadfcb
--- /dev/null
+++ b/plugins/sounio/README.md
@@ -0,0 +1,23 @@
+# Sounio
+
+[中文文档](./README_CN.md)
+
+Check a Sounio `.sio` source file using a compiler already available in the local project, and keep source checking separate from compilation, execution, CI, and scientific validation.
+
+## Requirements
+
+- ZCode with this plugin installed and enabled.
+- A Sounio checkout containing `bin/souc`, or a `souc` command already on `PATH`.
+- The `.sio` file to check must be accessible in the current project.
+
+## Use
+
+Invoke `/sounio:check-sio path/to/file.sio` in a Sounio project. The command reads project instructions, checks that the file exists, then asks ZCode to run `souc check` through the project wrapper or an existing compiler on `PATH`. It reports the exit status and diagnostics without claiming that the program compiled or ran.
+
+The `sounio-development` skill is also available when working on Sounio source or compiler diagnostics. It emphasizes the repository's own instructions and evidence boundaries.
+
+## Permissions and side effects
+
+This plugin contains only prompt files: no executable script, hook, MCP server, bundled compiler, or credential requirement. The check command asks ZCode to execute the local compiler on the named file; review that shell action before approving it. The plugin itself does not install software, send data to a network service, or edit project files. The selected compiler or wrapper may create or update temporary files and project-local generated artifacts. In particular, Sounio's `bin/souc` may materialize `bin/madaros-linux-x86_64` and `bin/.madaros-linux-x86_64.verified` in the checkout during startup.
+
+The plugin text is original and released under Apache-2.0. Sounio itself is a separate Apache-2.0 project at [Sounio-lang/sounio](https://github.com/Sounio-lang/sounio).
diff --git a/plugins/sounio/README_CN.md b/plugins/sounio/README_CN.md
new file mode 100644
index 0000000..77d99c6
--- /dev/null
+++ b/plugins/sounio/README_CN.md
@@ -0,0 +1,23 @@
+# Sounio
+
+[English](./README.md)
+
+使用本地项目中已有的编译器检查 Sounio `.sio` 源文件，并明确区分源码检查、编译、运行、CI 和科学验证。
+
+## 前提条件
+
+- 已在 ZCode 中安装并启用此插件。
+- Sounio 仓库内有 `bin/souc`，或 `PATH` 中已有 `souc` 命令。
+- 当前项目中可以访问要检查的 `.sio` 文件。
+
+## 使用方法
+
+在 Sounio 项目中执行 `/sounio:check-sio path/to/file.sio`。该命令先读取项目指令并确认文件存在，再让 ZCode 通过项目包装器或 `PATH` 中已有的编译器执行 `souc check`。它报告退出状态和诊断信息，不会把检查成功称为程序已编译或已运行。
+
+处理 Sounio 源码或编译器诊断时，也可以使用 `sounio-development` Skill。它强调遵循项目自身的指令并准确描述证据范围。
+
+## 权限与副作用
+
+本插件只包含提示文件：没有可执行脚本、Hook、MCP 服务、附带的编译器或凭据要求。检查命令会请 ZCode 对指定文件运行本地编译器；执行前请审阅该 Shell 操作。插件本身不安装软件、不向网络服务发送数据，也不修改项目文件。所选编译器或包装器可能创建或更新临时文件及项目内的生成产物。特别是 Sounio 的 `bin/souc` 启动时可能在仓库中生成 `bin/madaros-linux-x86_64` 和 `bin/.madaros-linux-x86_64.verified`。
+
+插件文本为原创，采用 Apache-2.0 许可。Sounio 是独立的 Apache-2.0 项目，地址为 [Sounio-lang/sounio](https://github.com/Sounio-lang/sounio)。
diff --git a/plugins/sounio/commands/check-sio.md b/plugins/sounio/commands/check-sio.md
new file mode 100644
index 0000000..0d71aa8
--- /dev/null
+++ b/plugins/sounio/commands/check-sio.md
@@ -0,0 +1,10 @@
+---
+description: Check one Sounio .sio file with an existing local compiler
+---
+
+Check the single `.sio` file named in $ARGUMENTS. If there is no unambiguous path, ask for one. Do not search the filesystem for a substitute file.
+
+1. Read the project's agent instructions before running a command. Confirm the file exists and has a `.sio` extension.
+2. From the Sounio repository root, prefer its `bin/souc` wrapper. Otherwise use `souc` already on `PATH`. If neither is available, report that prerequisite and stop. Do not download, build, or install a compiler. Before execution, disclose that the selected compiler or wrapper may create or update project-local generated artifacts; Sounio's `bin/souc` may materialize `bin/madaros-linux-x86_64` and `bin/.madaros-linux-x86_64.verified` during startup.
+3. Run the selected compiler's `check` subcommand on that file, with the path passed as one quoted argument. Do not use `eval`, interpolate the path into a shell program, or run `compile` or `run`.
+4. Report the compiler path, source path, exit status, and relevant diagnostics. A successful `check` is only a source-check result; it does not establish successful native compilation, execution, scientific validity, or CI status.
diff --git a/plugins/sounio/skills/sounio-development/SKILL.md b/plugins/sounio/skills/sounio-development/SKILL.md
new file mode 100644
index 0000000..fe51d8d
--- /dev/null
+++ b/plugins/sounio/skills/sounio-development/SKILL.md
@@ -0,0 +1,12 @@
+---
+name: sounio-development
+description: Use when editing or diagnosing Sounio .sio code, compiler diagnostics, or Sounio test results. Follow the repository's own compiler and evidence contracts.
+---
+
+# Sounio Development
+
+Sounio is a language and self-hosted compiler, not a Rust dialect. Read the current project's `AGENTS.md` and relevant Sounio documentation before changing syntax, compiler behavior, or scientific claims. Use existing `.sio` examples rather than translating Rust patterns by analogy.
+
+For a requested source check, use `/sounio:check-sio` or follow its single-file procedure. Prefer the repository's `bin/souc` wrapper when working in Sounio itself; do not guess at a raw compiler binary or silently fall back to a stale artifact. Keep check, native compile, execution, test-suite, remote CI, and scientific acceptance as distinct outcomes.
+
+When a check fails, quote the diagnostic and locate the responsible source construct before proposing a patch. When it succeeds, report only what was actually checked. Do not run numerical experiments, make clinical claims, or treat a successful compiler exit as a proof.