migrated custom tools to V2 plugin

README.md

@@ -11,7 +11,7 @@ OpenCode uses three component types:
 | Component | Location | Purpose | Example |
 |-----------|----------|---------|---------|
 | **Skills** | `.opencode/skills/` | Reference knowledge | `issue-writing` knows how to structure good issues |
-| **Tools** | `.opencode/tools/` | Custom functions | `spawn_issues` implements multiple issues in parallel |
+| **Tools** | `.opencode/plugins/` | Custom functions, provided by plugins | `tools` registers the `tea-*` Gitea CLI tools |
 | **Agents** | `.opencode/agents/` | Specialized subagents | `code-reviewer` handles PR reviews |
 
 ## Quick Start
@@ -29,7 +29,7 @@ make install
 
 This creates symlinks at:
 - `~/.config/opencode/skills/` → `.opencode/skills/`
-- `~/.config/opencode/tools/` → `.opencode/tools/`
+- `~/.config/opencode/plugins/` → `.opencode/plugins/`
 - `~/.config/opencode/agents/` → `.opencode/agents/`
 
 ### Uninstallation
@@ -67,7 +67,7 @@ architecture/
 │
 ├── .opencode/                  # OpenCode configuration
 │   ├── skills/                 # Reference knowledge (SKILL.md files)
-│   ├── tools/                  # Custom tools (TypeScript/JS)
+│   ├── plugins/                # Plugins registering custom tools (TypeScript)
 │   └── agents/                 # Specialized subagents (AGENT.md files)
 │
 ├── Makefile                    # Symlink management
@@ -96,24 +96,42 @@ Skills are auto-discovered by OpenCode and available via the `skill` tool.
 
 ### Tools
 
-Create `.opencode/tools/<name>.ts`:
+Tools are registered by plugins under `.opencode/plugins/`. Create `.opencode/plugins/<name>/index.ts`:
 
 ```typescript
-import { tool } from "@opencode-ai/plugin"
+import { Plugin } from "@opencode/plugin"
 
-export default tool({
+import type { Info } from "@opencode/plugin/promise/tool"
+
+const example: Info = {
+  name: "example",
   description: "What this tool does",
-  args: {
-    param: tool.schema.string().describe("Parameter description"),
+  input: {
+    type: "object",
+    properties: {
+      param: { type: "string", description: "Parameter description" },
+    },
+    required: ["param"],
+    additionalProperties: false,
   },
-  async execute(args) {
+  async execute(input) {
+    const { param } = input as { param: string }
     // Your implementation
-    return "result"
+    return { content: `result for ${param}` }
+  },
+}
+
+export default Plugin.define({
+  id: "example",
+  async setup(ctx) {
+    await ctx.tool.transform((editor) => {
+      editor.add(example)
+    })
   },
 })
 ```
 
-Tools are auto-discovered and available to the LLM.
+Tool input schemas are plain JSON Schema, and execution returns structured content. Plugins under `.opencode/plugins/` are auto-discovered and their tools are available to the LLM.
 
 ### Agents